关键词: 多入多出, 空间复用, 联合收发优化, 码速率

Abstract:

A new algorithm of joint transmit and receive optimization based on the practical need of the communication system was put forward. The new optimization algorithm could optimize the MIMO spatial multiplexing system to minimize the symbol error rate with the constraint of a fixed transmit power and data rate. The whole MIMO spatial multiplexing system could be decomposed into several independent parallel subchannels by the optimized transmit and receive filter. And modified Fischer's loading algorithm could be applied into these subchannles according to the new algorithm of joint transmit and receive optimization. Eventually, the optimal transmit power allocated to these subchannels were achieved. The analysis results are consistent with the simulation results. The lower the rate is, the better performance will be achieved in the same MIMO spatial multiplexing system with the same SNR; the more antennas the system has, the better performance will be gained with the same rate.

Key words: multiple input multiple output, spatial multiplexing； joint transmit and receive optimization； code rate