摘要
目前对多天线信道容量的研究几乎都是集中在具有精确信道估计的假设上,但是它实现起来有一定的难度。在Walsh扩频地址码、多码检测和最大似然接收机的基础上,研究了Rayleigh衰落情况下信道估计误差对MIMO CDMA系统的影响。分析及仿真结果均表明:信道容量随着信道估计误差的增加迅速下降;对于N×N系统,在固定的信道估计误差和信噪比下容量和天线的数目呈线性关系,容量增加的斜率随信道估计误差的增大而减小。
More studies of multi-antenna capacity focus on the assumption that the system has perfect channel estimation, but it difficult to realize. Based on Walsh spread spectrum codes, multi-code detection and maximum likelihood detectors, we study the influence on MIMO CDMA system under Rayleigh fading channel. The simulation shows that： capacity decease as estimation error increase; for a N×N system the relation of capacity and the number of antennas is linear at given SNR and estimation error, and its slope is inverse proportion to estimation error.
出处
《电路与系统学报》
CSCD
北大核心
2008年第1期139-142,共4页
Journal of Circuits and Systems
关键词
信道估计
WALSH码
多码检测
estimation error
Walsh codes
multi-code code detection
