MPSK信号的最大似然SNR估计方法

许华; 郑辉

MPSK信号的最大似然SNR估计方法

许华,
郑辉

计量
- 文章访问数: 2600
- HTML全文浏览量: 120
- PDF下载量: 1392
- 被引次数: 0
出版历程
- 收稿日期: 2003-12-01
- 修回日期: 2004-02-02
- 刊出日期: 2005-04-19

On the Maximum-Likelihood SNR Estimation Algorithm for MPSK Signals

Xu Hua,
Zheng Hui

摘要

摘要: 该文利用最大似然准则分别推导了对于MPSK信号的数据辅助SNR估计方法、判决指向SNR估计方法和一种新的盲信噪比估计方法。文章对这些算法的性能进行了分析和计算机仿真，并与其它一些SNR估计算法进行了比较。分析和仿真的结果显示数据辅助的SNR方法性能优越，很好地符合了信噪比估计性能下限(CRLB)。判决指向算法性能依赖于判决的准确程度，在高信噪比时性能较好；而在低信噪比条件时，特别是小于OdB以后其估计有较大偏差。新的盲SNR估计算法对于BPSK信号具有估计范围广、精度高和复杂度小的特点，但是当M增加时性能会明显下降。
- 最大似然准则;信噪比估计;MPSK信号;判决指向
Abstract: The data-aimed (DA) Signal-to-Noise Ratio (SNR) estimation algorithm, Decision-Directed (DD) SNR estimation algorithm and a new blind SNR estimation algorithm for MPSK signals are presented in this paper with maximum-likelihood principle. The detail performance analysis, computer simulation and performance comparing with other SNR estimation algorithms are completed. The analysis and simulation results show that the DA algorithm has a perfect performance and as good as the performance lower bounds. The performance of DD algorithm depends directly on the accuracy of decision, so it is good when the SNR is high. But when the SNR is low and, especially, less than OdB, the estimation has relatively great bias. The new blind SNR estimation algorithm has broad estimation range, good performance and low computational complexity for M=2 (BPSK), but the performance degrades while Mis increasing.

HTML全文

参考文献(1)

Beaulieu N C, Toms A S, Pauluzzi D R. Comparison of four SNR estimators for QPSK modulations[J].IEEE Commun. Letters.2000,4(1):43-[2]Shin Dong-Joon, Sung Wonjin, Kim In-Kyung. Simple SNR estimation methods for QPSK modulated short bursts. Proc.IEEE Globalcom, San Antonio, Texas, USA, 2001:3644 - 3647.[3]Pauluzzi D R, Beaulieu N C. A comparison of SNR estimation techniques for the AWGN channel[J].IEEE Trans. on Commun.2000, 48(10):1681-[4]Li B, Difazio R, Zeira A. A low bias algorithm to estimate negative SNRs in an AWGN channel[J].IEEE Commun., Letters.2002, 6(11):469-[5]Li B, Difazio R, Zeira A, Pietraski P J. New results on SNR estimation of MPSK modulated signals. Proc. IEEE PRIMC,Beijing, China, 2003:2373 - 2377.[6]Summer T A, Wilson S G. SNR mismatch and online estimation in Turbo decoding[J].IEEE Trans. on Commun.1998, 46(4):421-[7]Ramesh A, Chockalingam A, Milstein L B. SNR estimation in generalized fading channels and its application to turbo decoding.Proc. IEEE ICC, Helsinki, Finland, 2001:1094 - 1098.[8]Ramesh A, Chockalingam A, Milstein L B. SNR estimation in Nakagami-m fading with diversity combining and its application to Turbo decoding[J].IEEE Trans. on Commun.2002, 50(11):1719-[9]Alagha N S. Cramer-Rao bounds of SNR estimates for BPSK and QPSK modulated signals[J].IEEE Commun. Letters.2001, 5(1):10-[10]Viterbi A J, Viterbi A M. Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission[J].IEEE Trans. on Info. Theory.1983, 29(7):543-

施引文献

资源附件(0)

访问统计