Transmitter Diversity Antenna Selection Techniques for Wireless Channels Utilizing Differential Space-Time Block Codes

The paper deals with transmitter diversity Antenna Selection Techniques (ASTs) for wireless channels utilizing Differential Space-Time Block Codes (DSTBCs). The proposed ASTs tend to maximize the Signal-to-Noise Ratio (SNR) of those channels. Particularly, we propose here the so-called general (M, N ; K) AST/DSTBC scheme for such channels. Then, based on this AST, we propose two modified ASTs which are more amenable to practical implementation, namely the restricted (M, N ; K) AST/DSTBC scheme and the (N+N̄ , N ; K) AST/DSTBC scheme. The restricted (M, N ; K) AST/DSTBC scheme provides relatively good bit error performance using only one feedback bit for transmission diversity purpose, while the (N + N̄ , N ; K) AST/DSTBC scheme shortens the time required to process feedback information. These techniques remarkably improve Bit Error Rate (BER) performance of wireless channels using DSTBCs with a limited number (typically 1 or 2) of training symbols per each coherent duration of the channel. Simulations show that the proposed AST/DSTBC schemes outperform the DSTBCs without antenna selection even with only 1 training symbol.