改进空时分组编码算法在OFDM通信系统中的应用

Improved space-time block coding algorithm applied in OFDM communication system

提出了一种将改进的新型空时分组码与OFDM系统相结合的方法,使系统获得的最大分集增益为收发天线总数与频率衰落多径数的乘积,大大减小了对抗频率选择性衰落和窄带干扰。仿真结果显示,该系统的性能明显优于OFDM系统,随着接收天线数目的增加,系统的性能得到进一步改善。

A new method which combines the improved space-time block coding （NSTBC） with OFDM is proposed to make the maximum gain of the system be the product of the number of transmit-receive antennas and the number of multi-path, so that both the frequent selective fading and narrow band interference are decreased greatly. Experimental simulation results indicate that the performances of NSTBC-OFDM system is better than that of OFDM system and its performance would be improved more with the increase of antennas.