The space time block code(STBC) can not provide simultaneously both full diversity and full transmission rate in a transmit diversity system having more than two transmit antennas.. There are a quasi orthogonal STBC for four transmit antennas that provides full transmission rate and minimized interference. Recently, a simple correlation canceling algorithm is introduced to achieve full diversity from STBC considering four transmit antennas. In this paper, we propose a new decoding procedure using the power allocation at the transmitter and subtraction interference process at the receiver to achieve a better performance without noise enhancement.

Our new decoding procedure using power allocation at the transmitter and subtraction interference process improves the performance of quasi-orthogonal space time block code with four transmit antennas without noise enhancement.

Decoding Performance of Quasi-Orthogonal Space Time Block Code Using Optimal Transmit Power Allocation