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Performance Analysis of MIMO Systems Using OSTBCs

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Author(s): Sudhir Kumar Jha

Journal: International Journal of Engineering Trends and Technology
ISSN 2231-5381

Volume: 4;
Issue: 7;
Start page: 2860;
Date: 2013;
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Keywords: Multiple input and multiple otuput (MIMO) systems | Orthogonal Space – time Block Coding (OSTBC) | Rayleigh fading channels | and Bit Error Rate (BER)

ABSTRACT
The use of multiple antennas at transmitter as well as at receiver of a communication system gaining ground in wireless network. This method is used for achieving spatial diversity to combat fading without expanding the bandwdith of the transmitted signals. This paper presents the analyses of the BER performance of the different modulation schemes using up to four transmit as well as receive antennas. In this analysis we have used orthogonal space – time block code diversity system over flat Rayleigh fading channels. Independent fading between diversity channels is assumed. Diversity consists of transmitting a single space-time coded stream through all antennas. Spatial multiplexing increases network capacity by splitting a high rate signal into multiple lower rate streams and transmitting them through the different antennas. In spatial multiplexing, the receiver can successfully decode each stream given that the received signals have sufficient spatial signatures and that the receiver has enough antennas to separate the streams. The result of using these MIMO techniques is higher data rate or longer transmit range without requiring additional bandwidth or transmit power. This paper presents a detailed study of diversity coding for MIMO systems. Differentspace-time block coding (STBC) schemes including Alamouti’s STBC for 2 transmit antennas as well as orthogonal STBC for 3 and 4 transmit antennas are explored. Finally, these STBC techniques are implemented in MATLAB and analyzed for performance according to their bit-error rates using BPSK, QPSK, 16-QAM, and 64-QAM modulation schemes.

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