Space time Block Coding for MIMO systems over a Raleigh fading Channels with Low Decoding Complexity

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Shriddha Shrivastava
Jaikaran Singh, MukeshTiwari


The demand for mobile communication systems with high data rates has dramatically increased in recent years. New methods are necessary in order to satisfy this huge communications demand, exploiting the limited resources such as bandwidth and power as efficient as possible. MIMO systems with multiple antenna elements at both link ends are an efficient solution for future wireless communications systems as they provide high data rates by exploiting the spatial domain under the constraints of limited bandwidth and transmit power. Space-Time Block Coding (STBC) is a MIMO transmit strategy which exploits transmit diversity and high reliability. This paper presents a detailed study of Different space-time block coding (STBC) schemes including Alamouti’s STBC for 2 transmit antennas and 2 receive antennas as well as orthogonal STBC for 3 and 4 transmit antennas and 3 and 4 receive antennas are explored. Orthogonal space–time block codes (OSTBC) from orthogonal designs with maximum-likelihood (ML) decoding achieve low decoding complexity and full diversity. Finally, these STBC techniques are implemented in MATLAB. And ccomparative analysis for performance according to their bit error rates using M-ary PSK, QPSK, QAM, modulation schemes at the transmitter side in a Raleigh fading channel.

Keywords: MIMO system, orthogonal space time block code, digital modulation, ML Detector


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