Comparison of 4 transmit antennas OFDM-STBC Systems based on channel feedback
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CSI, MIMO Transmit diversity, OFDM, STBC.
Abstract
Space time block coding (STBC) with transmit beamsteering can achieve significant diversity and array gain in multi-antenna wireless systems which is a MIMO transmit strategy supporting the most recently wireless applications. However, it exploits perfect channel information (CSI) state at the transmitter, which is practically difficult to be achieved due to the limitation of a feedback channel, therefore quantized channel information can be used with a minimum feedback overhead. Linear precoding with a certain matrix size can be used to 4 transmit antennas system which can be combined with STBC. Alamouti scheme for 2 transmit antennas can be also extended to 4 transmit antennas. In addition to its diversity gain, it can achieve array gain based on generation of two beamsteering phase angles. A comparison of precoded STBC scheme versus extended STBC is made and simulation results show that the performance of extended Alamouti is to have a significant advantage over precoded STBC scheme and can reduce feedback signalling overhead.
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