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�������պ����ѧѧ�� 2011, Vol. 37 Issue (10) :1308-1311    DOI: CNKI:11-2625/V.20111020.1126.001
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Instantaneous phase based SNR estimation algorithm for BPSK signals
Zhang Xiaoyong, Luo Laiyuan*
Southwest Electronics and Telecommunication Technology Research Institute, Chengdu 610041, China

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�ؼ����� �����   ����   BPSK   ˲ʱ��λ   AWGN     
Abstract�� By studying of the characteristics of the instantaneous phase of the mixed signals of sinusoidal signal and additive white Gaussian noise (AWGN), a novel signal-to-noise ratio (SNR) estimation algorithm for binary phase shift keying(BPSK) signal was proposed. There is a nearly linear one to one relationship between the variance of instantaneous phase and the SNR, based on which the estimation of SNR was acquired by comparing the variance of instantaneous phase of the received signal with the theoretical one. The algorithm treated directly with the over sampled baseband signal, so symbol timing and synchronization, which were hard to acquire when symbol-rate is unknown or in accurate, are not needed. Computer simulations were used to test the performances of the SNR estimation algorithm. Results show that the proposed algorithm is more accurate in precision than the high-order cumulants based method and the subspace decomposition based method.
Keywords�� signal to noise ratio   estimation   binary phase shift keying   instantaneous phase   additive white Gaussian noise     
Received 2010-06-20;
About author: ������(1982-),��,���պ�����,��ʿ��,tianzxy@126.com.
������, ����Դ.����˲ʱ��λ��BPSK����ȹ����㷨[J]  �������պ����ѧѧ��, 2011,V37(10): 1308-1311
Zhang Xiaoyong, Luo Laiyuan.Instantaneous phase based SNR estimation algorithm for BPSK signals[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(10): 1308-1311
http://bhxb.buaa.edu.cn//CN/CNKI:11-2625/V.20111020.1126.001     ��     http://bhxb.buaa.edu.cn//CN/Y2011/V37/I10/1308
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