Ofdm Simulation Research Papers - Academia.edu (original) (raw)

In this work the inter carrier interference (ICI) in PRS-OFDM system with different polynomials is investigated. Carrier to interference ratio (CIR) is studied depending on the frequency offset (ε) for OFDM systems with any Correlative... more

- by Abdulkareem Kadhim
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- Computer Science, MIMO-OFDM systems, Ofdm Systems, Bit Error Rate
- by Aulia Annisa
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- Computer Science

Gholamreza Baghersalimi, Timothy O’Farrell, Vas Postoyalko Institute of Integrated Information Systems, School of Electronic and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds, UK, LS2 9JT Email:eengba@leeds.ac.uk, tof@ee.leeds.ac.uk, v.postoyalko@leeds.ac.uk Abstract In this paper the impact of a Radio-over-Fibre optical sub-system on the performance of Wideband Code Division Multiple Access is evaluated. The study investigates the use of pilot-aided channel estimation to compensate for the optical sub-system non-linearities in the presence of AWGN. The results show that pilot-aided (optical) channel estimation is an effective method of compensating for the optical sub-system impairments. It is found that there is always a suitable pilot power level which minimises the system Bit Error Rate (BER) performance.

- by Gholamreza Baghersalimi
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- by Anybody Nobody
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- Computer Science, MIMO-OFDM systems, Ofdm Systems, Bit Error Rate

Quadrature amplitude modulation (QAM) is a modulation scheme used by digital communication systems to obtain high data rates in bandwidth-limited channels. M-ary QAM schemes with M values greater than 256 are currently used by wireless network standards, such as WiFi 6 and WiFi 7 (final standard will be released in 2024), which use the 1024-QAM and 4096-QAM modulation schemes, respectively. With the continuous development of technology for digital communication systems, both wireline and wireless, it is essential to research regarding advanced modulation schemes. This study discusses the simulation of the 1024-QAM and 4096-QAM modulation schemes using MATLAB software to compare the performance of the two modulation schemes in data transmission through the AWGN channel without using an error control code. The simulation results show that 4096-QAM is superior to 1024-QAM but requires higher Eb/N0 and SNR values. The Eb/N0 value required by the 4096-QAM to achieve a bit error ratio (BE...

- by Danang Maulana Ikhsan
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The Subcarrier Index Modulation OFDM (SIM-OFDM) appeared in 2009 promising a-3 dB transmitted power reduction without affecting the system performance. Therefore, it became an attractive choice to upgrade the communication systems with researchers' increasing interest. Despite the research efforts in SIM-OFDM field, there was no in-depth investigation for such transmitted power reduction or the system's performance. The claimed power reduction relies on probabilistic assumptions that were not validated considering system operation concepts. This paper provides a new analytical model that characterizes the actual SIM-OFDM behavior. The contribution of this model is the inclusion of the majority condition in the derivation of 1's pmf which modifies the 1's pmf into a complex nonlinear function that is always higher than 1/2. The new pmf effect upon the power reduction, synchronization, and the overall Bit Error Rate (BER) is investigated. The new analytical model shows that the-3 dB power reduction cannot be achieved. Also, no successful synchronization can be established unless extra subcarrier is added that will create a frame like communication system. Such scheme increases BER if the carrier is falsely detected creating a Frame Error Rate (FER) which might lead to serious problem.

I ACKNOWLEDGEMENTS II TABLE OF CONTENTS III LIST OF FIGURES IV LIST OF TABLES V CHAPTER

- by Ahmed Jabbar
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- Computer Science, MIMO-OFDM systems, Ofdm Systems, Bit Error Rate
- by Martha Cecilia Paredes
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- Engineering, Mathematics, Computer Science, Secrecy

Research in integrating the human ecology approach into evaluation of the sustainability of the brackish-water shrimp aquaculture in coastal area of Nghia Hung district, Nam Dinh province. PhD student Nguyễn Thị Phương Loan The thesis presents briefly and upgrades the human ecology theory to clarify the value and necessity of the human ecology approach for sustainable development. The human ecology approach has been applied to evaluate the sustainability of the brackish-water shrimp aquaculture in the coastal areas of Nghia Hung district, Nam Dinh province. Methods applied in the research process include: rural rapid assessment, system analysis, physio-chemical analysis, extended cost-benefit analysis, ecosystemand community-based management, well-being index method proposed by Robert Prescott-Allen and aquaculture sustainable indicators (ASI) proposed by Nguyen Dinh Hoe. Although both area and infrastructure of brackish-water shrimp aquaculture activity at Nghia Hung district have ...

- by Trung Kiên
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Abstrack – This paper evaluates the performance of the Neural Network algorithm as a PAPR reduction techinique of a OFDM system. Simulation result shows that for OFDM signals with subcarrier numbers of 64 and modulation 16 QAM, application the NN algorithm gives a decreasing PAPR value 5,6 dB camparing to PAPR of OFDM signal without reducton. Also comparing the NN algorithm with other reduction techniqes such as Iterative Clipping and Filtering, (ICF), Selective Mapping (SLM) and Partial Transmit Sequence (PTS). CCDF curves shows the performance the NN algorithm has the best one comparing to Iterative Clipping and Filtering, (ICF), Selective Mapping (SLM) and Partial Transmit Sequence (PTS) techniqes. At the receiver side the evaluation is represented in bit error rate values, and the NN algorithm has the best performance.

- by Nikhil Sharma
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- Computer Science, Technology, Algorithm, MIMO

- by Trung Kiên
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The amplify-and-forward and the decode-and-forward cooperative coded diversity and is compared with the conventional receiver coded diversity in terms of the pairwise error probability and the overall bit error rate. The diversity systems under consideration can achieve the diversity order at most two. The performance comparison assumes channel coding with non-binary linear modulations, independent fading channels with pathloss attenuations proportional to the distances between the communicating nodes, and the diversity combining at the destination receiver. The expressions for the pairwise error probabilities are obtained analytically and verified by computer simulations. The performance of the cooperative diversity is found to be strongly relay location dependent. Hence, using the analytical as well as extensive numerical results, the geographical areas of the relay locations are obtained for small to medium signal-to-noise ratio values, such that the cooperative coded diversity o...

- by Mutaz Al-Tarawneh
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With recent increase in the demand for mobile communication services, future generations of mobile systems are expected to provide very high data rate transmissions as well as improved quality of service to users within commercial feasibility so as to avoid poor reception which the users are experiencing nowadays. OFDM which is a form of multicarrier transmission is a promising technique capable of providing quality of service at high data rates. In this paper, the OFDM system was developed for orthogonal 32, 64, and 128 subcarriers at different mobile speeds of 30km/h, 60km/h and 120km/h over frequency selective multipath channel. The developed model was simulated using MATLAB application package. OFDM-4QAM modulation format was employed to provide the parallel transmission and the received signal was compared with the transmitted signal to analyze the bit error rate performance of the OFDM system. The results obtained showed that as the number of subcarriers increased from 32, thr...

- by Olumide Ajayi
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- Data Rate
- by Raihan Dwi Putra
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- Fiber Optics
- by Samir J. Almuraab
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- Computer Science, MIMO-OFDM systems, Ofdm Systems, Bit Error Rate

- by 24_Đỗ Trung Kiên _ DHQT15A4HN
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- by Juliano Coutinho Oliveira
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- Electronic Engineering, Mathematics, Radio over fiber, Estimator

The patent can be used in multiple sectors, including but not
limited to transportation and power distribution networks, banking
and financial services, mobile telemedicine, telework applications,
and industrial control and monitoring systems. Any service
provider company that adopts this invention will become the
pioneer in providing mobile service providers worldwide with
physical layer security as a service (PSaaS). Consumers can be
compensated with extra money for being supplied with highly
protected networks that are impossible to hack or crack. As a
network provider, this invention will support network service
providers and mobile operators, who aim to increase their brand
awareness and value by supplying consumers with a new service
to protect their essential wireless applications unconditionally.
The invention can be used worldwide, and international
companies from Huawei to Samsung and all top network service
providers in Turkey such as Turk Telekom, Vodafone, Turkcell
will be interested in acquiring this invention.

Zero padded single carrier spatial modulation system is an effective method of data transmission. This system achieves full multipath diversity and imposes a relatively low maximum likelihood detection complexity. However the main drawback of this system is that it suffers from high Peak-to-Average problem. In this paper, we propose an effective reduction scheme that combines Discrete Cosine transform and Selective mapping technique along with zero padding. The scheme is composed of the Discrete Cosine transform followed by the Selective mapping using the Riemann matrix to obtain phase sequences for the Selective mapping technique. The simulation results shows that the PAPR can be greatly reduced by applying the proposed system with low complexities computation and the bit error rate performance is significantly better than the zero padded spatial modulation technique. This approach also avoids randomness in phase sequence selection to provide easier decoding at the receiver. Also t...

- by Stalin Jacob
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- Mathematics, Computer Science, Algorithm, Discrete Cosine Transform

Orthogonal Frequency Division Multiplexing (OFDM) memiliki kelemahan yang terletak pada tingginya variasi daya. Variasi daya ini dinyatakan dalam peak-toavarage power ratio (PAPR). PAPR merupakan perbandingan antara daya maksimum dan daya rata-rata sinyal OFDM pada rentang waktu tertentu. Nilai PAPR yang tinggi akan mengakibatkan distorsi nonlinear saat beroperasi pada perangkat non linear seperti high power amplifier (HPA). Oleh karena itu, dibutuhkan teknik untuk meruduksi nilai PAPR. Dalam tugas akhir ini, dilakukan simulasi reduksi PAPR dengan menggunakan teknik clipping. Reduksi PAPR dilakukan dengan melakukan clipping terhadap sinyal keluaran blok IFFT yang memiliki nilai PAPR melebihi clipping level yang nilainya ditentukan oleh clipping ratio yang dalam pengujian ini menggunakan nilai clipping ratio 0,8 dan 1,4. Penggunaan clipping ini memberikan pengaruh peningkatan kualitas complimentary cumulative distribution function (CCDF) dan penurunan kualitas Bit Error Rate (BER). D...

- by Sri Suning Kusumawardani
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- Mathematics, Physics

The development of digital video broadcasting is still continue recently and was done by many parties. One of the project regarding this research was DVB project. There was three areas in digital video broadcasting. One of them was Digital Video Broadcasting Satellite Second Generation (DVB-S2). The development of this project is not focus only in video broadcasting but also focus in applications and mutlimedia services. The objective of this research was to implement raised cosine filter in DVB-S2 using matlab simulink in order to optimize SNR and BER value. Parameters used in this project was QPSK mode and LDPC with 50 iteration. Those parameters was chosen to maintain originality of data that sent in noisy channel. The result showed that by implementing raised cosine filter could optimized BER value of the system. The higher SNR value would give the lower BER value. In static video, the best SNR value when using a filter is 0.9 dB with a BER value of 0.000004810 while for dynamic...

- by emy haryatmi
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- Computer Science, DVB-T, Digital Video Broadcasting
- by Mario Poggioni
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- Engineering, Electronic Engineering, Computer Science, Technology

Visible light communications are limited by the narrow bandwidth of their sources as the light-emitting diodes, which restricts the high data rates transmission. A potential technique such as multi-carrier modulation is considered promising for achieving a high-speed data rate and enhancing system performance. This paper proposes turbo coding with unipolar orthogonal frequency-division multiplexing (U-OFDM) for indoor environments. The system under U-OFDM considerations can reduce the inter-symbol interference caused by multiple paths and mitigate burst errors by adopting an iterative turbo decoding. The system performance is evaluated regarding the bit error rate (BER) for the range of the signal-to-noise ratio (SNR) under receiver field-of-view (FOV) restriction. The obtained results show that the performance system of the target BER (below the threshold limit of 3.8×10 −3) has a power penalty of ~9 dB for modulation order of 64 for quadrature amplitude modulation scheme, FOV of 50°, and incidence angle of half power assigned to 30°. The obtained results also showed a ~10.8 dB improvement in the SNR when comparing the present system with coded-DCbiased optical OFDM under the same considerations.

- by Indonesian Journal of Electrical Engineering and Computer Science and +2
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- Visible Light Communications, Turbo Codes, DCO-OFDM

Proficient, multi mode and re-configurable architecture of interleaver/de-interleaver for multiple standards, like DVB, OFDM and WLAN is presented. Interleaver plays vital role in 4G technologies to recover symbols from burst errors. The aim of our work is to design a reconfigurable modulation technique called Adaptive modulation scheme uses QAM, QPSK and BPSK modulation that adapt themselves based on channel Signal to Noise ratio. Subcarrier allocation algorithm specifically used to focus on utilizing channels with high gains. Our proposed model can achieves a data rate of min 2.5 Gbps as per 3GPP standard by adaptive modulation technique using QAM, BPSK and QPSK.

- by Mangai K
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- BPSK, IEEE 802.16e, Ofdm Simulation, QPSK

This paper aims to evaluate and improve the quality of Internet signal transmission based on a HFC (Hybrid Fiber CoaxiaI) network using OFDM (Orthogonal Frequency-Division Multiplexing) technique and carrier technical reuse. The OFDM technique divides a channel into N channels and makes them change from high-speed data stream to parallel data streams. This paper will also investigate a HFC network model in practice to develop a way that helps optimize the calculation of parameters such as Internet signal power per channel, calibration of signal amplification level and attenuation of the active element on different channels. This proposed method can be applied to network design and stream capacity enhancement while the transmission signal quality is still dependabe.

- by Dũng Hoàng
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- Materials Science
- by Mohamed Fouad
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- Engineering, Computer Science, Distributed Computing, Intrinsic motivation

One way to increase the performance of Orthogonal Frequency Division Multiplexing System (OFDM) system is by adding a channel coding (error correction code) in order to detect and correct errors that occur when sending data.At communication of acoustic underwater channel coding is required because of the characteristics of the channel bottom water is much different compared with the air channel and errors are likely to occur.In this research it was made simulation of acoustic underwater communication system with OFDM applied channel codingin which using Hamming code (7,4) and Hamming code (15,11) that is able to correct one error and detect two errors then BCH code capable to correct two errors for BCH (15,7) and correct 9 errors forBCH (127,64) and Reed Solomon code able to correct two errors for RS (15,11) and correct 8 errors for RS (31,15). Results of the study confirm the better performance when system usesOFDM with BCH Code (127.64) than other codes that are used, starting fro...

In this paper, a pilot based channel estimation for multiple input multiple output (MIMO) with orthogonal frequency division multiplexing (OFDM) with space time block coding is studied. The MIMO-OFDM system is used to boost the high data rates and reduces the inter carrier interferences (ICI). The amalgam of multiple input multiple output (MIMO) with orthogonal frequency division multiplexing (OFDM) provides admirable data rate in wireless channel. In multiple input multiple output system and orthogonal frequency division multiplexing (MIMO-OFDM) system, the channel state information is very acceptable. So channel state information sometime caviling the capability of the system and the correct signal cannot receive properly at the receiver side. So the training sequences are sending along with the data to achieve the good and efficient data at the receiver side. There are various method to insert the pilot with the data. The training pilot symbols are sending along with the data sym...

- by Neenu Sharma
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This paper aims to improve the channel estimation (CE) in the indoor visible light communication (VLC) system. We propose a system that depends on a comparison between Deep Neural Networks (DNN) and Kalman Filter (KF) algorithm for two optical modulation techniques; asymmetrically clipped optical-orthogonal frequency-division multiplexing (ACO-OFDM) and direct current optical-orthogonal frequency division multiplexing (DCO-OFDM). The channel estimation can be evaluated by changing the rate of errors in the received bits, where increased error means a performance decrease of the system and vice versa. Receiving less errors at the receiver indicates improved channel estimation and system performance. Thus, the main aim of our proposal is decreasing the error rate by using different estimators. Using the simulation results with the metric parameter of bit error rate (BER) aims to determine the improvement ratio between different systems. The proposed model is trained with OFDM signal s...

- by Wessam Salama
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- Optical physics, Electrical And Electronic Engineering
- by Ade Kunle
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- Computer Science, Channel Estimation, Ofdm Used with Matlab, Ofdm Simulation
- by Alyaa Al Barrak
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- Computer Science, BCH Code
- by Pauline Simpson
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Pada makalah ini dilakukan evaluasi kinerja teknik pengodean konvolusi pada sistem komunikasi kooperatif dengan protokol amplify-and-forward (AF) dan menerapkan strategi seleksi relai dengan simulasi. Di sisi pemancar (sumber) diterapkan gabungan teknik reduksi peak to average power ratio (PAPR) skema selective mapping (SLM) dan predistorsi model Hammerstein. Di relai diterapkan juga teknik predistorsi model inverse Rapp. Di sisi kanal digunakan relai sebagai antena virtual. Penggunaan relai dalam sistem komunikasi kooperatif dapat diimplementasikan untuk jaringan 4G atau 5G pada penelitian selanjutnya, tetapi tentu membutuhkan bandwidth yang besar. Penerapan strategi seleksi relai mampu meningkatkan efisiensi bandwidth karena hanya relai terbaik saja yang akan meneruskan informasi dari pengirim ke penerima. Strategi seleksi relai jenis konvensional digunakan untuk mengevaluasi kinerja teknik pengodean konvolusi pada skema multirelai dengan memilih sebuah relai terbaik yang memperti...

- by ida anisah
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Informasi untuk mengetahui lokasi benda atau seseorang merupakan salah satu hal yang penting dalam kehidupan sehari-hari. Selama ini, teknologi Global Positioning System (GPS) dapat diandalkan ketika berada di luar ruangan. Namun, ketika di dalam ruangan, GPS akan sulit menjangkau secara spesifik area bangunan. Dengan memanfaatkan teknologi Light Fidelity (Li-Fi), Indoor Positioning System (IPS) akan lebih mudah dilakukan dan mempunyai keunggulan dari segi akurasi dan efisiensi energi. Tetapi, jika dikaitkan dengan IPS, pemasangan lampu Light Emitting Diode (LED) perlu diperhatikan geometri pemasangannya. Penelitian ini membahas akurasi IPS pada Li-Fi apabila dengan berbagai bentuk geometri dan lokasi pemasangan lampu LED yang berbeda-beda. Teknik positioning Received Signal Strength (RSS) digunakan dengan mengambil kuat daya terima sebagai estimasi suatu jarak. Dengan membandingkan masing-masing bentuk geometri, maka didapatkan data konfigurasi terbaik untuk implementasi IPS. Hasil...

- by Akhmad Hambali
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Efficiency and adaptivity play a major role in the design of fourth-generation wireless systems (4G). These systems should be efficient in terms of bandwidth and power allocation and will satisfy the users requirement on low power consumption, little interferences with other systems, and high rate transmission. Moreover, low complexity transceivers are expected. This paper will propose a novel multiple access technique called OWDM-IDMA (Orthogonal Wavelength-Division Multiplexing-Interleave Division Multiple Access) as the combination of the OWDM (Orthogonal Wavelength-Division Multiplexing) and IDMA (Interleave Division Multiple Access) schemes. The IDMA and OWDM principles are also outlined. The comparison between the conventional OFDM-IDMA and the proposed OWDM-IDMA is performed in term of Power to Average Power Ratio PAPR, as well as evaluating the performance of our presented technique over Additive White Gaussian Noise AWGN multipath channels by estimating the BER (Binary Erro...

- by Awatif Rouijel
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- Computer Science, Wireless
- by Samaneh Berenjian
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- Computer Science, Survey Research, Error Control Coding, Optical fiber

- by Ahmed Jabbar and +1
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- Orthogonal Frequency Division Multiplexing (OFDM), MIMO-OFDM systems, Ofdm Systems, Desing and Simulation of Ofdm
- by Payal Sahu
- •
- Image Processing, Wireless Communications

Abstrak Teknologi informasi dan komunikasi sedang berkembang dengan cepat. Visible Light Communication (VLC) adalah perkembangan teknologi komunikasi yang multi fungsi untuk memenuhi dua kebutuhan manusia yaitu penerangan dan konektivitas internet. Namun pada kenyataan penerapan teknologi ini perlu memiliki standar parameter untuk tercapainya mobilitas pengguna yang maksimal dan juga konsumsi energi yang minim guna menciptakan teknologi multifungsi dan efesien. Full Width Half Maximum (FWHM) adalah salah satu parameter yang mempengaruhi kinerja sistem VLC khusus nya pada sisi transmitter. Ideal nya FWHM ditentukan berdasarkan kebutuhan, namun guna menjawab tantangan mobilitas user yang terbatas maka FWHM ideal perlu ditentukan. Hasil yang didapatkan dengan performansi keberhasilan sistem adalah BER 10-3 adalah 22,72 meter persegi dari luas keseluruhan ruangan 25 meter persegi pada rentang FWHM 70o - 85o. Kata Kunci : VLC, FWHM, Coverage, Transmitter, BER. Abstract Information and co...

- by Vinsensius Sigit
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- Physics, Visible Light Communication