Computer Engineering and Applications ›› 2012, Vol. 48 ›› Issue (22): 142-146.

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Cramer-Rao lower bounds for estimating carrier parameters of PSK signals in multi-antenna cooperative receivers

YANG Ke1,2, WAN Mingkang1, LI Ou1   

  1. 1.College of Information Engineering, the PLA Information Engineering University, Zhengzhou 450002, China
    2.China Defense Science and Technology Information Center, Beijing 100142, China
  • Online:2012-08-01 Published:2012-08-06

多天线协同接收PSK载波参数估计的CRLB

杨  珂1,2,万明康1,李  鸥1   

  1. 1.解放军信息工程大学 信息工程学院,郑州 450002
    2.中国国防科技信息中心,北京 100142

Abstract: This paper investigates the PSK parameter estimation problem with multiple independent cooperative receivers, and derives the Cramer-Rao Lower Bounds(CRLBs) of BPSK/QPSK frequency and phase estimation based on either known or random data. Compared with the CRLBs in traditional single receiver, the results indicate that the CRLBs for Data-Aided(DA) carrier frequency and phase estimation of PSK signals in multi-antenna cooperative receivers are the same with the CRLBs in traditional single receiver, but the CRLBs for Non-Data-Aided(NDA) estimation for multi-antenna cooperative receivers are lower than the traditional ones.

Key words: multi-antenna, frequency estimation, Phase Shift Keying(PSK) signal, Cramer-Rao Lower Bound (CRLB)

摘要: 针对利用多个独立天线对同一信号进行协同接收的问题,推导了数据辅助(DA)和非数据辅助(NDA)方式BPSK/QPSK信号频率及相位估计的Cramer-Rao下界(CRLB),并与传统单个天线接收时的CRLB进行了比较。结果表明,在DA方式下,多天线协同接收PSK信号频率及相位估计的CRLB与传统单天线接收的CRLB相同;在NDA方式下,多天线协同接收的CRLB则要低于传统单天线接收的CRLB。

关键词: 多天线, 频率估计, 相移键控(PSK)信号, Cramer-Rao下界