摘要
针对多天线信号合成技术的权值估计问题,提出了一种高斯信道下基于EM算法的权值估计算法,该算法能够实现非数据辅助情况下权值幅度和相位的联合估计,推导了多路情况下相位估计的Cramer-Rao下界(CRLB)。对MPSK和MQAM信号进行大量计算机仿真,结果表明该算法估计精度高,适用于多种调制方式,高信噪比下权值幅度与相位的估计值能够达到CRLB。
Aiming at computing the combining weight for signal combining techniques in multi-antenna, this paper presents a combining weight estimation algorithm based on EM algorithm. It is nondada-aided （NDA） , and can estimate extent and phase of the combining weight at the same time. Cramer-Rao lower bound （CRLB） of the phase of multiple outputs has also been derived. Simula- tions are performed for MPSK and MQAM signals. It is shown that this algorithm is valid for any arbitrary constellation and offers excellent performance. The amplitude and phase estimation value of combining weight can both arrive at the CRLB.
出处
《信息工程大学学报》
2011年第3期302-306,317,共6页
Journal of Information Engineering University
基金
国家自然科学基金资助项目(60872043)
关键词
多天线信号合成
合成权值
EM算法
signal combining techniques in multi-antenna
combining weight
EM algorithm
