衰落信道空间相关对空时编码性能的影响

Influence of spatial correlated fading channels on space-time block codes

在各收发天线间的信道相互独立时,空时编码技术可获得最大分集增益。而在实际环境中,信道之间是彼此相关的,这将在一定程度上影响通信系统的性能。结合差分空时编码方案研究该问题,并以2个发射天线,1个接收天线为例详细推导了空间相关衰落信道条件下,差分检测方案误码率上界的解析表示式。计算机仿真验证了该表示式的有效性。

Only if the channels are mutually independent can the greatest diversity gain be obtained by the space-time block codes. However, the practical transfer channels are always correlated with each other, which would inevitably degrade the performance of communications. Incorporating the space-time block codes, this paper studies the influence of spatial correlated Rayleigh fading channels. Particularly, an analytical formula for the upper bound of symbol error rate is derived with two transmit antennas and one receive antenna, and its validness is verified through computer simulations.