MIMO Systems Research Papers - Academia.edu (original) (raw)

In this paper a Hardware-In-the-Loop (HIL) test platform is used to design a flight stabilization system for Unmanned Aerial Vehicles (UAV). Controllers are first designed and tested separately for lateral and longitudinal axes using numerical simulations, and later these controllers are merged on the HIL platform. It is observed that the resulting controller successfully stabilizes the aircraft to achieve straight and level flight.

- by
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- MIMO Systems, UAV and Aircraft control, Hardware-In-the-Loop, PID controller design

Keywords: MIMO antenna UWB antenna Model predictive Control Non-uniform microstrip line Printed monopole antenna a b s t r a c t A novel ultra wideband (UWB) printed monopole multiple-input multiple-output (MIMO) antenna with non-uniform transmission line using nonlinear model predictive control (NMPC) is presented. The proposed antenna is superior to conventional antennas in terms of dimensions, gain, and efficiency while maintaining the impedance bandwidth. In order to improve the results, a non-uniform transmission line has been used for impedance matching between the radiated patch element and the coaxial cable. For designing the non-uniform transmission line, it has been expanded using cosine terms. Regarding the presence of differential equation for the variation in the impedance of the transmission line and its transformation to the state-space equation, NMPC has been employed to design the transmission line and determine the cosine expansion coefficients. Two base antennas, as MIMO, were simulated configuration and fabricated. The surface area of the proposed MIMO antenna is 0.99 k 2 g , the wavelength has been obtained for the center frequency of the 3.16 GHz to 10.6 GHz range, and its mutual coupling, peak gain, channel capacity loss (CCL), total active reflection coefficient (TARC), mean effective gain (MEG) and diversity gain (DG), envelope correlation (ECC) are acceptable. The simulation and measurement results are in good agreement, and the proposed antenna is suitable for MIMO applications. Ó 2020 The ''Authors". Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Secrecy capacity is a fundamental informationtheoretic performance metric to predict the maximum data rate
of reliable communication, while the intended message is not
revealed to the eavesdropper. Motivated by this consideration,
in this paper a unified communication-theoretic framework for
the analysis of the probability of non-zero secrecy capacity, the
secrecy outage probability and the secrecy capacity of multipleantenna systems over fading channels is proposed. Specifically,
a powerful frequency-domain approach is first developed, in
which the integrals involved in the evaluation of the probability
of non-zero secrecy capacity and secrecy outage probability are
transformed into the frequency domain, by employing Parseval’s
theorem. A generic approach for the evaluation of the asymptotic
secrecy outage probability at high signal-to-noise ratio (SNR)
region is also introduced, thus providing useful insight as to the
parameters affecting the secrecy performance. Finally, a unified
numerical approach for computing the average secrecy capacity
of multiple-antenna systems under arbitrary fading environments is developed. The proposed framework is general enough
to accommodate any well-known multi-antenna transmission
technique and fading model. Finally, the secrecy performance
of several multiple-antenna system setups is assessed, in the
presence of generalized fading conditions and arbitrary antenna
correlation, while various numerical and computer simulation
results are shown and compared to substantiate the proposed
mathematical analysis

- by Kostas Peppas
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- MIMO Systems, Fading Channel, Physical layer security

An investigation is carried out into the control techniques implemented on a tandem linear direct current machine. The purpose is to control the both motions of the conducting bar such that it moves extremely quickly at the reference velocity of 3.7m/s from the beginning of the rail track to the end of the rail track while bringing itself to a halt at a specific displacement. Standard state variable feedback with pole placement was implemented for controller design to obtain the desired performance specifications and compared with basic linear quadratic control. Simulations conducted revealed that the system dynamics that were set were successfully achieved however there is room for improvement and suggestions for future work is provided. The report concludes that standard pole placement feedback produced better results than linear quadratic control due to the nature of the system.

In this paper, we propose fairness-oriented packet scheduling (PS) schemes with power-efficient control mechanism for future packet radio systems. In general, the radio resource management functionality plays an important role in new OFDMA based networks. The control of the network resource division among the users is performed by packet scheduling functionality based on maximizing cell coverage and capacity satisfying, and certain quality of service requirements. Moreover, multi-antenna transmit-receive schemes provide additional flexibility to packet scheduler functionality. In order to mitigate inter-cell and co-channel interference problems in OFDMA cellular networks soft frequency reuse with different power masks patterns is used. Stemming from the earlier enhanced proportional fair scheduler studies for single-input multiple-output (SIMO) and multiple-input multiple-output (MIMO) systems, we extend the development of efficient packet scheduling algorithms by adding transmit power considerations in the overall priority metrics calculations and scheduling decisions. Furthermore, we evaluate the proposed scheduling schemes by simulating practical orthogonal frequency division multiple access (OFDMA) based packet radio system in terms of throughput, coverage and fairness distribution among users. In order to completely reveal the potential of the proposed schemes we investigate the system performance of combined soft frequency reuse schemes with advanced power-aware packet scheduling algorithms for further optimization. As a concrete example, under reduced overall transmit power constraint and unequal power distribution for different sub-bands, we demonstrate that by using the proposed power-aware multi-user scheduling schemes, significant coverage and fairness improvements in the order of 70% and 20%, respectively, can be obtained, at the expense of average throughput loss of only 15%.

- by lissy mathew
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- Wireless Communications, MIMO Systems, Wireless Communication

"The 3D-GBSBCM (Geometrically Based Single Bounce Cylinder Model) channel model is applied
in UAV (Unmanned Aerial Vehicle) MIMO communication system which involves direct, reflection and
diffuses components. The concise and precise space-time-frequency correlation functions of the UAV channel
model are presented. Methods of channel matrix factorization and channel coefficient normalization are applied
to deduce the correlation matrix of UAV-MIMO channel. We also use the assumed parameters of correlation
matrix to simulate and analyze the influence of antenna distribution on UAV-MIMO channel capacity when the
parameters of channel are certain. The simulation results have good reference and application value in the
configuration and collocation of antennas in UAV-MIMO system."

- by Yingsong Li
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- MIMO Systems

The paper deals with the issue of developing an attitude control system for a remotely operated vehicle (ROV) for large inclination angles (pitch, roll). The construction of the orientation control system is considered based on the traditional approach using Euler angles (yaw, pitch and roll). A transfer matrix general form of the ROV attitude control system was obtained. It was shown that with the increase of inclination angles the transfer matrix of the system becomes multivariable. Algorithms of disturbances compensation and a methodology for parameters selection for decomposition algorithm were proposed. The obtained results were verified during the in situ tests of the ROV “Iznos”, developed in Bauman Moscow State Technical University (BMSTU). The proposed decomposition algorithms allow to expand the ranges of working angles and to improve the quality of the control system performance without significant re-engineering of its structure.

- by Ekaterina Gavrilina
- •
- Underwater Robotics, Decomposition, MIMO Systems, Quaternion
- by Yaoyu Tao
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- Wireless Communications, MIMO Systems

Underwater communication is one of the unique and challenging fields in communication engineering in the case of both designing and communication. But it is very necessary to study on UWC as major portion of earth contains sea water. UWC has many scopes in various areas like Radar, Sonar, oceanography, UWIoT, etc. UWC mainly of three types through optical fiber, RF waves, and acoustic waves. Communication with acoustic waves use low decibel sound waves and have long transmission range than others. This paper explains about some acoustic waves communication within underwater. Mainly different areas and applications in UWC with acoustic waves are explained as a literature work.

- by Divya R
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- Signal Processing, Wireless Communications, MIMO Systems, Underwater Communication

Performance Analysis of Fixed Gain Amplify and Forward Based Cooperative Diversity in multiple-input multiple-output (MIMO) relay channels is discussed in this paper. The paper simulates the bit error rate (BER) and channel capacity performance of fixed gain amplify-and-forward (AF) N×L×M MIMO relaying system using optimal power allocation under flat fading Rayleigh channel. The system consists of source (S), relay (R) and destination (D). Where N, L and M are the number of source, relay and destination antennas, respectively. Each node equipped with equal number of antennas such that N=L=M. The simulations cover the cases when N equal 2, 4 and 8. The channel status information (CSI) is perfectly known at both the relay and destination but not known at the source. Diversity was achieved through using orthogonal space-time block coding technique (OSTBC) at the source. OSTBC is used to encode the BPSK modulated signal before being transmitted through flat fading Rayleigh channel. At the destination, the received signals from both the relay and the source in two phases (time slots) were combined by Maximal Ratio Combiner (MRC) and detected by Maximum-Likelihood (ML) detector. MATLAB is used to simulate the BER and capacity performance of AF N×L×M MIMO relaying system. Also make a comparison between the BER and capacity performance of conventional N×M MIMO system and AF N×L×M MIMO relaying system under the same conditions. The fixed gain AF N×L×M MIMO relaying system simulations achieved low BER without need a high Eb/No values compared with conventional N×M MIMO system.

- by Anas Abu Tabaneh
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- MIMO-OFDM systems, MIMO Systems, DF Relaying, MIMO Relaying

The paper presents detail study of multiple inputs and multiple output antennas for 5G applications. Multiple antennas are applied at transmitter and receiver, which improve the performance of communication system. The performance of MIMO system depends on the correlation between multiple path signal propagating signals, high isolation improve capacity of communication system. The aim of this paper is to present tutorial of recent developments in antenna design.

- by IAEME Publication
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- Communication, MIMO Systems, Smartphones, MIMO antenna
- by feng zhao
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- MIMO Systems
- by Helmy Naji
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- MIMO Systems

Radio frequency (RF) energy transfer and harvesting techniques have recently become alternative methods to power the next generation wireless networks. As this emerging technology enables proactive energy replenishment of wireless devices, it is advantageous in supporting applications with quality of service (QoS) requirements. In this paper, we present an extensive literature review on the research progresses in wireless networks with RF energy harvesting capability, referred to as
RF energy harvesting networks (RF-EHNs). First, we present
an overview of the RF-EHNs including system architecture, RF
energy harvesting techniques and existing applications. Then, we present the background in circuit design as well as the state-of-the-art circuitry implementations, and review the communication protocols specially designed for RF-EHNs. We also explore various key design issues in the development of RF-EHNs according to the network types, i.e., single-hop networks, multi-antenna networks, relay networks, and cognitive radio networks. Finally, we envision some open research directions.

- by Xiao Lu
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- Wireless Communications, Resource Allocation, MANET Routing protocols, MIMO-OFDM systems

Interchanges Vehicle-to-vehicle (V2V) have seen enhancing consideration over the most recent couple of years. In this work, we specify the utilization of the 3GPP Long Term Evolution (LTE) standard innovation connected to V2V. We create experimental models for the V2V channel, and the show comes about because of far reaching PC reenactments, in light of both the uplink (UL) and downlink (DL) principles for LTE. We give results to 10 MHz and 20 MHz channels, as far as BER, BLER, phantom effectiveness and throughput, utilizing numerous MIMO modes. Results demonstrate the intriguing achievability of the LTE innovation in V2V correspondence frameworks.

- by Ijariit Journal and +1
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- MIMO Systems, Long Term Evolution (LTE), Vehicle-to-vehicle communication (V2V)

MIMO systems have now become a key technology in wireless communications as it provides significantly high data rates. It creates multiple paths between the transmitter and receiver to enable more data to travel in a single unit of time thus leading to increase in data rates. V-BLAST scheme has got multiple transmitters. The data stream is divided in substreams and is transmitted independently through multiple transmitters. This paper will give an overview of V-BLAST technique from theoretical point of view and its practical implementation. It envisages on the selection of desirable modulation scheme in terms of BER, system throughput and outage probability for SISO and MIMO channel with V-BLAST architecture.

In this paper, a novel secure data transmission method called interference signal superposition-aided multiple-input multiple-output with antenna number modulation and adaptive antenna selection (ISS-MIMO-ANM-AAS) is presented to defend transmission systems against eavesdropping attacks or to share secret information between two communication parties in scenarios, where perfect secrecy and ultimate confidentiality are required to be achieved. In the proposed method, while data is transmitted to the legitimate receiver by exploiting the features of MIMO-ANM through transmitting additional data bits with the number of active antennas along with those bits sent by using conventional M-PSK/QAM modulation, the data that the eavesdropper receives is aimed to be mixed by an interference signal superposed (ISS) with the original signal to eliminate the possible wiretapping activities. The conducted theoretical analysis along with the obtained numerical simulations for the proposed ISS-MIMO-ANM-AAS method proves the effectiveness of the scheme, where MIMO-ANM transmission is shown to be fully secured through the ISS algorithm. Thus, the introduced ISS-MIMO-ANM-AAS method can be considered a strong potential candidate method for scenarios where ultra-security is the main requirement of wireless systems including WiFi, 5G, 6G, and beyond technologies. The codes of this article can be found at https://researcherstore.com/product/simulation-codes-for-the-interference-signal-superposition-mimo-with-antenna-number-modulation-and-adaptive-antenna-selection-for-achieving-perfect-secrecy/
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The Matlab simulation codes used to generate the results in this paper can be found at https://researcherstore.com with the name ISS-MIMO-ANM. WISLAB (wislabi.com/solutions) offers solutions for building and deploying fully secure, cloud-based, and low-cost end-to-end 4G/5G networks along with providing consultations on helping companies reduce their networks CAPEX/OPEX cost and determine which solutions are best suited for their needs and use cases.

- by Karim Banawan
- •
- Wireless Communications, MIMO Systems, OFDM, GSM, WiMAX, LTE
- by Nandhini Ilangovan
- •
- Wireless Communications, MIMO Systems, Space Time Processing

A compact tri band antenna for long-term evolution (LTE) MIMO over Wireless sensor node transmission is presented in this paper. now days micro strip patch antenna has been commercially used in many applications such as satellite, mobile, global positioning system and medical services. Wireless sensor node communication systems and wireless computer networks are most commonly used and they are in need of antennas in different frequency bands. All kind services to obtain on single antenna is challenging at higher Frequency range which means that Ku-K-Ka band level. In this paper to study and investigate different rectangular shape and to achieve Ku-K-Ka band frequency with wider bandwidth. This Quad Arm shape antenna having a size of 45 mm x 45 mm used low-dielectric-constant substrates and dual-stacked patches with coaxial probe feeds to achieve the required wide bandwidth. The proposed antenna comprises different rectangular wavelength radiating strips and a slotted ground plane. This antenna design on different thickness and analyzed result of all thickness between 14GHz to 27GHz frequency, When the proposed antenna fabricated on a low-cost FR4 epoxy substrate with the thickness of 1.2 mm, relative dielectric constant of 4.4, and loss tangent of 0.008.The radiating strips and slots generate a impedance bandwidth (2:1 VSWR) achieved is the lower 14.8 GHz (Ku) band, Middle band 20 GHz ,23.2 GHz,(K- band) and 26.4GHz on the upper (Ka) band for future LTE Band. A novel isolation technique by placing a rectangular patch between the radiating strips is presented. The rectangular patch creates a dedicated current path for each radiating strip. This paper to study, investigate and simulated the results s using Ansoft HFSS. The Omni directional radiation pattern format, stable peak gain, small group delay and transfer function variation was observed on the whole Ku-K-Ka band frequency range. Its support data transmission over Wireless sensor node for Multiple Input Multiple Output systems with various LTE Band applications and also support for 4G Network

- by Pachiyannan Muthusamy and +1
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- MIMO Systems, Long Term Evolution (LTE)

While academicians, scholars and leaders round the globe envisage our
cities of tomorrow with millions of augmented reality users transmitting
and receiving holographic videos demanding wireless throughput up to 100 megabits per second per user, there prevails one immortal truth i.e. the amount of available electromagnetic spectrum in nature is constant. In order to achieve this ever-increasing total wireless throughput demand reliably, access points with multiple antennas can be employed. Hence, Massive MIMO emerges as a promising player in realizing these objectives. It is essentially based on Large Scale Antenna Systems with myriad physically small and individually controlled antennas processing data of multiple users by performing extensive multiplexing/demultiplexing operations. What gives Massive MIMO an edge over other technologies is that it utilizes directly measured channel characteristics for its operations and it is a scalable technology, thanks to the leverage Time Division Duplexing (TDD) provides. While the principles of operation of this technology are seemingly simple to comprehend, the technology is yet to be deployed in practice. This
work provides a brief survey of one of the techniques for realizing such infrastructure combining large-dimensional analog pre/post-processing with lower dimensional digital processing. We have also analyzed performance of this technology in terms of reliability and capacity vis-a-vis physical hardware constraints.

- by Ojasvi Alankar and +1
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- Wireless Communications, Mobile Communication, MIMO Systems, Digital beamforming

The adoption of Large Intelligent Surfaces (LIS) in assisting downlink multiuser communication from a multi-antenna base station is investigated in this paper. We present efficient designs for both the transmit power allocation and the coefficients of the surface reflecting elements, which target at maximizing either the energy or the spectral efficiency subject to individual link budget guarantees for the mobile users. Since both problem formulations are non-convex, we propose two computationally affordable approaches, which both capitalize on alternating maximization. To tackle the more demanding energy efficiency problem, we present an algorithm based on gradient descent for obtaining the LIS phase coefficients, while the optimal transmit power allocation is provided by a fractional programming method. For the energy efficiency maximizing LIS tuning, we also propose an efficient algorithm based on the majorization-minimization approach. Computer simulation results under a realistic outdoor system set up and power consumption model for LIS are presented, where LIS-assisted communication is extensively compared with the case of multi-antenna Amplify-and-Forward (AF) relaying. Our results corroborate the merits of LIS incorporation using both our proposed design algorithms, and it is indicated that LIS-assisted communication can provide up to 300% higher energy efficiency than the conventional AF relaying one.

- by George Alexandropoulos and +1
- •
- Multiple-input Multiple-output (MIMO) Systems, MIMO-OFDM systems, MIMO Systems, Beamforming

The next generation of wireless and mobile mobile communication systems requires a reliable transmission of high data rates under various channel types and different scenarios. The very high data rates that are required for future wireless and mobile communication systems do not appear to be feasible with the conventional techniques and architectures. The goal of reaching high data rates is particularly challenging for systems that are power, bandwidth, and complexity limited. However, another domain can be exploited to significantly increase channel capacity: the spatial dimension. This is achieved by the use of multiple transmit and receive antennas. Especially, Multi-User MIMO (MU-MIMO) system has brought a great improvement in the system capacity and spectral efficiency by serving multiple users simultaneously. Here will be presented a mathematical model of the downlink MU-MIMO system and its capacity, as well as different precoded transmission schemes for implementing the downlink MU-MIMO system, such as Dirty Paper Coding (DPC), and Tomlinson-Harashima precoding (THP).

An OFDM system is combined with multiple-input multiple-output (MIMO) in order to increase the diversity gain and system capacity over the time variant frequency-selective channels. However, a major drawback of MIMO-OFDM system is that the transmitted signals on different antennas might exhibit high peak-to-average power ratio (PAPR).In this paper, we present a PAPR analysis reduction of space-time-block-coded (STBC) MIMO-OFDM system for 4G wireless networks. Several techniques have been used to reduce the PAPR of the (STBC) MIMOOFDM system: clipping and filtering, partial transmit sequence (PTS) and selected mapping (SLM). Simulation results show that clipping and filtering provides a better PAPR reduction than the others methods and only SLM technique conserve the PAPR reduction in reception part of signal.

One of the breakthroughs of LTE is the incorporation of MIMO (multiple input multiple output) between UE (user equipment) and eNB (Evolved node-B) to enhance the performance of wireless communication system. The adaptive beamforming of MIMO can minimize both transmitted power of UE/eNB and interference at the receiving end. In this paper, we emphasize on the MIMO, varying the number of antenna ports at both ends. The first part of the paper provides the architecture, special features and frame structure of LTE system. Next, the performance of the network is evaluated using simulation in Matlab-15; where comparison is made between transmitted and received psd (power spectral density), scatter plot of received symbols, BER (bit error rate) varying the antenna ports under 16-QAM modulation scheme and outage probability is determined modeling probability density function of SINR (signal-to-interference-plus-noise ratio). The performance is found much better using two antennas at the UE instead of one antenna.

IEEE Communication System Project Titles 2017 | IEEE 2018 Matlab Communication Systems Projects for ECE, IT, CSE
A New Analytical Approach to Evaluate the Critical-Event Probability Due to Wireless Communication Errors in Train Control Systems
A New Framework of Filter Bank Multi-Carrier: Getting Rid of Subband Orthogonality
A Novel Spectrum Sensing for Cognitive Radio Networks with Noise Uncertainty
Application-Aware Resource Allocation of Hybrid Traffic in Cellular Networks
Bayesian Reinforcement Learning-Based Coalition Formation for Distributed Resource Sharing by Device-to-Device Users in Heterogeneous Cellular Networks
Comparison of Collision-Free and Contention-Based Radio Access Protocols for the Internet of Things
Design of Simultaneous Wireless Information and Power Transfer Scheme for Short Reference DCSK Communication Systems
Dynamic Resource Allocation for Immediate and Advance Reservation in Space-Division-Multiplexing-Based Elastic Optical Networks
Dynamic User Grouping and Joint Resource Allocation with Multi-Cell Cooperation for Uplink Virtual MIMO Systems
Energy and Spectral Efficiency of Cellular Networks with Discontinuous Transmission
Equal Interference Power Allocation for Efficient Shared Spectrum Resource Scheduling
Evolutionary Channel Sharing Algorithm for Heterogeneous Unlicensed Networks
Expectation-Maximization-based Channel Estimation for Multiuser MIMO Systems
FBMC and LDACS Performance for Future Air to Ground Communication Systems
Generalized 3-D Constellation Design for Spatial Modulation
Group Cooperation with Optimal Resource Allocation in Wireless Powered Communication Networks
Huffman Coding Based Adaptive Spatial Modulation
Joint Rate Control and Scheduling for Real-Time Wireless Networks
Joint Spectrum and Energy Efficiency in Device to Device Communication Enabled Wireless Networks
Location Privacy Preservation in Database-driven Wireless Cognitive Networks through Encrypted Probabilistic Data Structures
Multi-antenna Wireless Legitimate Surveillance Systems: Design and Performance Analysis
Multicarrier Approaches for High-baudrate Optical-Fiber Transmission Systems with a Single Coherent Receiver
Non-linear Distortion Cancellation and Symbol-based Equalization in Satellite Forward Links
Non-Orthogonal Random Access (NORA) for 5G Networks
Optimal Resource Allocation for Power-Efficient MC-NOMA with Imperfect Channel State Information
Parallel and Distributed Resource Allocation with Minimum Traffic Disruption for Network Virtualization
Resource Allocation Strategy for Multi-user Cognitive Radio Systems: Location-Aware Spectrum Access
Spectral and Energy Efficiencies in Full-Duplex Wireless Information and Power Transfer
Spectral Efficiency and Energy Efficiency Optimization via Mode Selection for Spatial Modulation in MIMO Systems
Subband Filtered Multi-carrier Systems for Multi-service Wireless Communications
TDMA versus CSMA/CA for wireless multi-hop communications: a stochastic worst-case delay analysis
The Error Propagation Analysis of the Received Signal Strength-Based Simultaneous Localization and Tracking in Wireless Sensor Networks
Training Sequence Design for Efficient Channel Estimation in MIMO-FBMC Systems
User Association and Resource Allocation Optimization in LTE Cellular Networks

This paper demonstrates a multi-input multi-output (MIMO) robust control approach where multiple scheduled designs are merged to produce a
smooth control law. The design is verified using software-in-the-loop (SIL) testing based on blade element theory (BET) for highly realistic flight simulations.
An inner-loop attitude controller balances performance and robustness, achieving a fast response time, low overshoot, good noise rejection and
minimal lateral–longitudinal coupling. The controllers are formed at several predetermined grid points so the design covers a wide flight envelope.
Blade element SIL testing shows that the flight control system preserves stable flight and follows the references well, even under tough weather conditions.
The proposed strategy is also compared with a classical autopilot design procedure and is seen to be superior.

- by Coşku Kasnakoğlu
- •
- MIMO Systems, Flight Dynamics and Control, Robust control systems, Blending

This paper presents a practical verification of an Active Disturbance Rejection Control (ADRC) method in governing a multidimensional system. The experiments were conducted on a two degrees of freedom planar manipulator with only partial knowledge about the mathematical model of the plant. This multi input multi output system was controlled with a set of two, independent, single input single output ADRC controllers, each regulating one of the manipulator degree of freedom. Modeling uncertainty (nonlinearities, cross-coupling effects, etc.) and external disturbances were assumed to be a part of the disturbance, to be estimated with an observer and canceled on-line in the control loop. The ADRC robustness was experimentally compared with the results obtained from using two decentralized, classic PID controllers. Both control methods were tested under various conditions, e.g. changing the inertial parameters of the plant. Significantly better results, in terms of parametric robustness, have been reported for the ADRC approach.

- by Rafal Madonski
- •
- Robotics, Control Systems Engineering, Robust control, MIMO Systems

In this paper multiple input multiple output (MIMO) antennas are investigated for better
connectivity of networks. The purpose of the research is to find the optimum solution for faster
and most importantly energy-efficient broadband and data streaming. Several versions of
antennas and their simplified prototypes were compared by radiation patterns, S-parameters
and antenna efficiency according to experimental results. The desired antenna should be
implementing the decoupling technique between antenna elements for MIMO system and be
capable of covering the wide band from GSM(850-1900 MHz) to C-band(3400-3600 MHz) in
order to provide sustainable connection.

- by Abbosjon Kudratov
- •
- MIMO Systems, 4G LTE, Energy efficient, 5g Network

Future generations of cellular communications requires higher data rates and a more reliable
transmission link with the growth of multimedia services, while keeping satisfactory quality of service, .
MIMO antenna systems have been considered as an efficient approach to address these demands by
offering significant multiplexing and diversity gains over single antenna systems without increasing
bandwidth and power. Although MIMO systems can unfold their huge benefit in cellular base stations,
but they may face limitations when it comes to their deployment in mobile handsets.
To overcome this drawback, relays (fixed or mobile terminals) can cooperate to improve the overall
system performance in cellular networks. Cooperative communications can efficiently combat the severity
of fading and shadowing through the assistance of relays. It has been found that using relays the capacity
and coverage of cellular networks can be extended without increasing mobile transmit power or
demanding extra bandwidth.

- by Rosdiadee Nordin
- •
- Wireless Communications, MIMO Systems

In this article, a dual-band WLAN/ultrawideband (UWB) printed wide slot microstrip-fed antenna is presented for multi-input multi-output (MIMO)/diversity applications. The proposed antenna consists of a U-shaped patch, a T-shaped monopole path, and a pentagonal wide slot in the ground plane. The antenna is designed to cover both the WLAN (2.4-2.485 GHz) and UWB (3.1-10.6 GHz) ranges, with value of S 11 below À10 dB. The antenna is constructed on a FR4 substrate with overall dimensions of 28 Â 28 Â 1 mm 3. It is shown that the proposed dual-band antenna is suitable for diversity polarization applications. The simulation results show that the different configurations of the antenna in the MIMO/diversity have good S-parameters over the operating frequency bands. The simulation and measured results of the proposed dual-band antenna as well as that of the MIMO/diversity antenna configuration agree well. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:461-465, 2013; View this article online at wileyonlinelibrary.com.

This paper presents the results of using a constant modulus algorithm (CMA) to recover shaped offset quadrature-phase shift keying (SOQPSK)-TG modulated data, which has been transmitted using the iNET data packet structure. This standard is defined and used for aeronautical telemetry. Based on the iNET-packet structure, the adaptive block processing CMA equalizer can be initialized using the minimum mean square error (MMSE) equalizer [3]. This CMA equalizer is being evaluated for use on iNET structured data, with initial tests being conducted on measured data which has been received in a controlled laboratory environment. Thus the CMA equalizer is applied at the receiver to data packets which have been experimentally generated in order to determine the feasibility of our equalization approach, and its performance is compared to that of the MMSE equalizer. Performance evaluation is based on computed bit error rate (BER) counts for these equalizers.

- by Serge Dossongui
- •
- Mobile Robotics, MIMO Systems, CMA, Equalizers

"We design an end-to-end linear transceiver in the downlink
of a multi-user multiple-input multiple-output (MIMO) system
with multiple data streams per user and quantized channel
state information at the transmitter. We minimize the sum
mean squared error (SMSE) under a sum power constraint
with quantization based on the mean squared inner product.
We make three contributions: (i) we remove dimensionality
constraints on the MIMO configuration and the resulting
feedback overhead scales linearly with the number of data
streams; (ii) we use the combination of eigenmode combining
and minimum mean square error receiver that makes user’s
feedback mutually independent; (iii) we analyze SMSE at
high signal-to-noise ratio and large number of transmit antennas
and derive an approximate SMSE floor."

- by Seyed Meysam Hosseini
- •
- Control Systems Engineering, MIMO Systems

In this paper, we consider the problem of space-time (ST) coding with pulse position modulation (PPM). While all the existing ST block codes necessitate rotating the phase or amplifying the amplitude of the transmitted symbols, the proposed scheme can be associated with unipolar PPM constellations without introducing any additional constellation extension. In other words, full transmit diversity can be achieved while conveying the information only through the time delays of the modulated signals transmitted from the different antennas. The absence of phase rotations renders the proposed scheme convenient for low- cost carrier-less multiple-input-multiple-output (MIMO) time- hopping ultra-wideband (TH-UWB) systems and for MIMO free-space optical (FSO) communications with direct detection. In particular, we propose two families of minimal-delay ST block codes that achieve a full transmit diversity order with PPM. Designate by n the number of transmit antennas and by M the number of modulation positions. For a given set of values of (n, m), the first family of codes achieves a rate of 1 symbol per channel use (PCU) which is the highest possible achievable rate when no constellation extensions are introduced. The second family of codes can be applied with a wider range of (n, m) at the expense of a reduced rate given by: R=1/n+n-1/n log₂(M-1)/n log₂(M).

- by wissam fawaz
- •
- MIMO Systems, FREE SPACE OPTICAL COMMUNICATION

Real-time analysis of a spatial multiplexing system for multimedia transmission is performed in this paper. Also performance veriﬁcation of MIMO system is important therefore we propose an SDR-based MIMO testbed to validate the theoretical performance gain. Real-time transmission of live video is used using USRP as a front end to show that MIMO systems are capable of supporting multimedia applications at enhanced data rates compared to SISO without needing to increase the system bandwidth. Here we propose a simple MIMO clock synchronization scheme utilizing the USRP clock structure to our advantage. LSE Channel Estimation and Zero-Forcing Equalizer are used to reduce computational complexity and enable the MIMO system to run at high speed.

- by Muhammad Qutab ud din
- •
- Wireless Communications, Software Defined Radio, MIMO Systems

Multi-user wireless systems with multiple antennas can drastically increase the capac-
ity while maintaining the quality of service requirements. The best performance of these
systems is obtained at the presence of instantaneous channel knowledge. Since uplink-
downlink channel reciprocity does not hold in frequency division duplex and broadband
time division duplex systems, efficient channel quantization becomes important. This
thesis focuses on different quantization techniques in a linearly precoded multi-user wire-
less system.
Our work provides three major contributions. First, we come up with an end-to-end
transceiver design, incorporating precoder, receive combining and feedback policy, that
works well at low feedback overhead. Second, we provide optimal bit allocation across the
gain and shape of a complex vector to reduce the quantization error and investigate its
effect in the multiuser wireless system. Third, we design an adaptive differential quantizer
that reduces feedback overhead by utilizing temporal correlation of the channels in a time
varying scenario.

This paper presents the bit error rate (BER) performance of the low density parity check (LDPC) based space-time trellis coded 2×2 multiple-input multiple-output orthogonal frequency-division multiplexing(STTC-MIMO-OFDM) system on text message transmission. The system under investigation incorporates 1/2-rated LDPC encoding scheme under various digital modulations (BPSK, QPSK and QAM) over an additative white gaussian noise (AWGN) and other fading (Raleigh and Rician) channels for two transmit
and two receive antennas. At the receiving section of the simulated system, Minimum Mean-Square-Error(MMSE) channel equalization technique has been implemented to extract transmitted symbols without enhancing noise power level. The effectiveness of the proposed system is analyzed in terms of BER with signal-to-noise ratio (SNR). It is observable from the Matlab based simulation study that the proposed
system outperforms with BPSK as compared to other digital modulation schemes at relatively low SNRs under AWGN, Rayleigh and Rician fading channels. The transmitted text message is found to have retrieved effectively at the receiver under implementation of iterative sum-product LDPC decoding algorithm. It has also been anticipated that the performance of the LDPC-based STTC-MIMO-OFDM
system degrades with the increase of noise power.

--In this Era of Evolving Technologies demand for Multiple-input Multiple-output (MIMO) system is growing at an explosive rate. Our incentive is to analyze the channel capacity inside the medium of Wireless Local Area Network (WLAN) such that the end user can acquire all sophisticated communication within the Global Reach. We mainly focus on taking strides in demonstrating an effective and efficient use of information theoretic capacity of independently and identically distributed (i.i.d) MIMO Rayleigh flat fading channels. Assuming each antenna in Transmitter is allocated equal amount of power which maximizes capacity.
To achieve such high capacity, power assigned to the sub channels which are having the lower SNR should be reduced to minimum possible. Water-Filling Algorithm (WFA) is presented for MIMO Rayleigh fading environment under Channel Side Information (CSI) is known and unknown at the transmitter. We show that through spectral efficiency it’s possible, as it offers the full coding rate when the numbers of transmitting and receiving antennas are equal. Data processing rates of channel for the particular WLAN considered are also presented with related reduction in the computational cost. We also compared the ergodic channel capacity and channel outage capacity with simulation results. Moreover the validity of the presented channel estimation algorithm and spectrum efficiency is verified through computer simulations using MATLAB.
Keywords--CSI, i.i.d, MIMO, SISO, SNR, WFA and PDF.

- by Sivadeep Reddy
- •
- Wireless Communications, MIMO-OFDM systems, MIMO Systems, RF and Microwave Systems

LTE (Long Term Evolution) is a 3GPP (Third Generation Partnership Project) wireless standards which uses the standard OFDMA (Orthogonal Frequency Division Multiple Access) modulation, MU-MIMO (Multiuser Multiple Input Multiple Output) technology and different multipath fading models. LTE allows the operator to use spectrum more efficiently to deliver high speed data. This paper characterizes the downlink performance of LTE. The requirement for high data rate applications demanded a system to provide users with the MIMO technology which constitutes a breakthrough in wireless communication and is defined in the LTE standard. There are many metric to characterize the performance, but one of the most convenient and informative metric is the BER (Bit Error Rate). So the performance is characterized in terms of BER. In this paper the LTE system is modelled and simulated using MATLAB and the BER for 2×2 and 4×4 MIMO-LTE using QPSK modulation schemes for Rayleigh fading environment are obtained against different SNR values.

- by Şeyma Akyürek and +1
- •
- MIMO Systems, Flight Dynamics and Control, PID controller design, Unmanned Aerial Vehicle (UAV)

This paper presents a secure beamforming design
to prevent eavesdropping on multiple-input multiple-output
(MIMO) device-to-device (D2D) communication. The devices
communicate via a trusted relay which performs physical layer
network coding (PNC), and multiple eavesdroppers are trying
to intercept the device information. The beamforming design is
based on minimizing mean square error of the D2D communication
while employing signal-to-interference-plus-noise ratio
(SINR) threshold constraints to prevent possible eavesdropping.
The channel state information of the device-to-eavesdropper and
relay-to-eavesdropper channels is imperfect at the devices and
relay. The channel estimation errors are assumed with Gaussian
Markov uncertainty model. Consequently, robust optimization
problems are formulated considering the multiple access and
broadcasting stages of the D2D communication. These problems
are non-convex, and two algorithms are proposed to solve them.
In the numerical analysis, we discuss the convergence of the
proposed algorithms, impact of the number of eavesdroppers on
the performance, and the SINR distributions at eavesdroppers.

The authors investigate quantisation and feedback of channel state information in a multiuser (MU) multiple-input multiple-output (MIMO) system. Each user may receive multiple data streams. The authors design minimises the sum mean squared error (SMSE) while accounting for the imperfections in channel state information (CSI) at the transmitter. This study makes three contributions: first, the authors provide an end-to-end SMSE transceiver design that incorporates receiver combining, feedback policy and transmit precoder design with channel uncertainty. This enables the proposed transceiver to outperform the previously derived limited feedback MU linear transceivers. Second, the authors remove dimensionality constraints on the MIMO system, for the scenario with multiple data streams per user, using a combination of maximum expected signal combining and minimum MSE receiver. This makes each user's feedback independent of the others and the resulting feedback overhead scales linearly with the number of data streams instead of the number of receiving antennas. Finally, the authors analyse the SMSE of the proposed algorithm at high signal-to-noise ratio (SNR) and large number of transmit antennas. As an aside, the authors show analytically why the bit error rate, in the high SNR regime, increases if quantisation error is ignored.

- by Karim Banawan
- •
- MIMO Systems, LTE, OFDMA, SC-FDMA