AN ENHANCED SCHEME FOR TRANSMIT ANTENNA DIVERSITY WITH FEEDBACK

초록

Multiple antennas transmission and/or reception systems have been shown to provide significant gains in spectral efficiencies over single antenna systems. This paper investigates transmit diversity schemes in the presence of feedback non-idealities including feedback delay and quantization error. In this paper, we propose a closed-loop transmit diversity scheme with quantized feedback that works well for high mobility as well as low mobility. The proposed scheme exploits a quantized weight vector codebook designed by separating into gain and phase codebooks. Simulation results indicate that the proposed scheme can provice a significant advantage in both complexity and flexibility over conventional methods.