一种快速时变衰落信道下的STBC-OFDM解码器

A new decoder for STBC-OFDM over time-selective fading channels

在正交频分复用(OFDM)宽带系统中,信号要经过信道的频率选择性衰落;而当接收端高速移动时,信号在接收端又要产生多普勒频移,从而产生信道的时间选择性衰落。在信道时变时,空时分组码-正交频分复用(STBC-OFDM)系统解码会引入发送天线间互干扰。提出一种多接收天线下的STBC-OFDM解码器,能有效地消除由于信道时变引发的干扰,同时又能最大地利用接收分集增益。仿真实验结果表明所提出方案具有更好的误比特率性能。

In the OFDM system, except tor frequency - selective lades, the high speed moving of the receiver causes channels＇ time - selective fading which arise due to Doppler shifts and carrier frequency offsets. The intertransmit antennas interference（ITAI） was caused due to channels＇ time -selective fading when we decode the OFDM symbols. A new decoder for STBC - OFDM was proposed by using multi received antennas. The proposed decoder perform robust performance to remove ITAI and make best use of the diversity gain. The better performance of error bit ratio is shown by simulation results.