Implementation of MIMO-OFDM System Based on MATLAB (original) (raw)
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Implementation of MIMO-OFDM System for WiMAX
2011
Error free transmission is one of the main aims in wireless communications. With the increase in multimedia applications, large amount of data is being transmitted over wireless communications. This requires error free transmission more than ever and to achieve error free transmission multiple antennas can be implemented on both stations i.e. base station and user terminal with proper modulation scheme and coding technique. The 4 th generation of wireless communications can be attained by Multiple-Input Multiple-Output (MIMO) in combination with Orthogonal Frequency Division Multiplexing (OFDM). MIMO multiplexing (spatial multiplexing) and diversity (space time coding) having OFDM modulation scheme are the main areas of focus in our thesis study. MIMO multiplexing increases a network capacity by splitting a high signal rate into multiple lower rate streams. MIMO allows higher throughput, diversity gain and interference reduction. It also fulfills the requirement by offering high data rate through spatial multiplexing gain and improved link reliability due to antenna diversity gain. Alamouti Space Time Block Code (STBC) scheme is used with orthogonal designs over multiple antennas which showed simulated results are identical to expected theoretical results. With this technique both Bit Error Rate (BER) and maximum diversity gain are achieved by increasing number of antennas on either side. This scheme is efficient in all the applications where system capacity is limited by multipath fading.
PERFORMANCE OF MIMO-OFDM SYSTEM FOR RAYLEIGH FADING CHANNEL Fig 1. Block diagram of MIMO system
This paper proposes a simple and efficient simulation method for MIMO-OFDM system with channel equalization.BPSK modulation is used to detect the behavior of the Rayleigh fading channel in presence of additive white Gaussian noise and then its performance is evaluated. Obtained result is then compared with adding MLSE equalizer. This paper shows that the addition of equalizer reduces the BER (Bit Error Rate) and the channel output becomes more pronounced. Though the total channel is a frequency selective channel, the channel experienced by each subcarrier in an OFDM system is a flat fading channel with each subcarrier getting independent Rayleigh fading.
Performance Analysis of MIMO-OFDM and MISO-OFDM System based on STBC Code
International Journal of Computer Applications, 2015
MIMO (Multiple Input Multiple Output)-OFDM (Orthogonal Frequency Division Multiplexing) technique is most attractive techniques in wireless communication system and it is very popular for high data rate capacity and against multipath fading. This paper presents performance analysis and a comparative study of OSTBC (Orthogonal Space Time Block Code) over Rayleigh fading channel for MISO (Multiple Input Single Output) defined that the transmitter has multiple antennas at the same time the receiver has one antenna and MIMO (Multiple Input Multiple Output) shows that the both the transmitter and receiver have multiple antennas. In this paper we propose QPSK (Quadrature Phase Shift Key), 16-QAM (Quadrature Amplitude Modulator) schemes and also observe that the performance of PAPR (peak power-to-average ratio), BER (bit error rate) in MIMO and MISO.
Mimo Channel and Performance Analysis using OFDM System for Reduced Bit Error Rate
ABC Research Alert, 2015
Multiple-input Multiple-output (MIMO) systems use multiple antennas at the transmitter and receiver end, are a key technology to meet the growing demand for high data rate wireless systems. The aim of this thesis is to investigate MIMO system capacity with the aim of achieving optimum Bit Error Rate (BER) while increasing the system capacity using multicarrier delay diversity modulation (MDDM), proposed for fifth generation systems. In principle, the capacity of MIMO system can increase linearly with the number of antennas. Multiple antennas at the transmitter and receiver provide diversity in a fading environment. Furthermore, the research work in this thesis consists of different investigations of the basic principle of MIMO, Multiple-input Single-output (MISO) and Single-input Single-output (SISO) wireless communication systems with Space Time Codes (STC). A MISO systems and MIMO systems are schematized using MDDM which incorporated with Orthogonal Frequency Division Multiplexing (OFDM). OFDM is chosen over a single-carrier solution due to lower complexity of equalizers for high delay spread channels or high data rates. The design is implemented with binary Phase Shift Keying (BPSK) and simulated using MATLAB, which is examined in associated Additive White Gaussian Noise (AWGN) channel. The receiver-design is included with the maximal ratio combiner (MRC) receiving technique with perfect wisdom of channel state information (CSI). The theoretical performance is derived for AWGN channels and compared with the simulated results as well as compared between each system to another.
Journal of Network and Information Security, 2021
Nowadays, we are living in the era of modern communication technology. The number of the mobile users is increasing tremendously day by day all over the world. Due to the increasing of the mobile users, the wireless communication systems are highly required a communication system that provides data transmissions rates and more reliability to the users. Multiple Input and Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is being considered to get those facilities. MIMO-OFDM has the ability to serve a large number of users with an enormous data transmission speed communication as well as utilizing the bandwidth efficiently. The multicarrier modulation technique is capable of reducing the inter symbol interference and multipath fading problems. In this paper, we mainly focused on analysis the performance of MIMO-OFDM systems and the performance of MIMO-OFDM has been measured in terms of the Bit Error Rate and Signal to Noise Ratio based on different channels such as-AWGN, Rayleigh fading, Rician fading and different modulation techniques such as-BPSK, QPSK, M-PSK, D-BPSK, D-QPSK, DPSK and QAM. All the simulations are performed by MATLAB framework.
BER & SNR Performance of MIMO OFDM with Space-Time Block Coding
2018
Multi-Input and Multi output-OFDM system which is the merging of two systems, MIMO and OFDM, have more data transmission rate with huge diversity. STBC with MIMOOFDM has a better performance against the multipath interference including destructive interference which causes fading with less Bit Error rate, coding complexity and more SNR ratio. Created and analyzed a digital prototype of a physical model for estimating the performance of the MIMOOFDM system with STBC. The analysis carried out here shows that the MIMO-OFDM system along with STBC has better Signal to Noise Power Ratio with less BER than the Non-STBC MIMO-OFDM system.
2005
We design STBC-OFDM systems with multiple-input multiple-output(MIMO) by applying several STBC schemes to the OFDM system and show their comparative analysis results obtained with the various mobile speeds, under Rayleigh fading environments, considering the effects of channel estimation error. There is no systematic comparative analysis for those STBC techniques, considering the 4th generation mobile system environments with various mobile speeds. Therefore it is very important to derive the optimum STBC-OFDM for 4G mobile system environments. We finally compare and analyze the BER performances of the STBC-OFDM systems according to the mobile speeds and the number of antennas.