New SNR Estimation Methods in Digital QPSK Receiver

Fu Wen-jun; Jiang Jing-shan; Wang Shuan-rong; Liu Si-yu

doi:10.3724/SP.J.1146.2005.00960

Volume 29 Issue 2

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Fu Wen-jun, Jiang Jing-shan, Wang Shuan-rong, Liu Si-yu. New SNR Estimation Methods in Digital QPSK Receiver[J]. Journal of Electronics & Information Technology, 2007, 29(2): 255-259. doi: 10.3724/SP.J.1146.2005.00960

Citation:

Fu Wen-jun, Jiang Jing-shan, Wang Shuan-rong, Liu Si-yu. New SNR Estimation Methods in Digital QPSK Receiver[J]. Journal of Electronics & Information Technology, 2007, 29(2): 255-259. doi: 10.3724/SP.J.1146.2005.00960

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New SNR Estimation Methods in Digital QPSK Receiver

doi: 10.3724/SP.J.1146.2005.00960

Received Date: 2005-08-01
Rev Recd Date: 2005-11-28
Publish Date: 2007-02-19

Abstract

Abstract

SNR maximum likelihood estimator based on data directed decision was evaluated first, and was concluded as a biased estimator. An unbiased estimator can be acquired through high order moments of received data. Two SNR estimators based on iteration method were developed in this paper. One is solving the QPSK NDA maximum likelihood equation by gradient approximation, which has better convergence performance than other methods. The other is based on the statistical parameters of received data, which not only makes received data buffering unnecessary, but also reduces iteration calculation greatly compared with other iteration methods, and more important, not at the cost of estimation performance degradation. Finally, the result of several SNR estimators in performance and calculation were compared and analyzed.

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References(1)

References

[1] Pauluzzi D R and Beaulieu N C. A comparison of SNR estimation techniques for the AWGN channel[J].IEEE Trans. on Communications.2000, 48(10):1681-1691 [2] 许华，樊龙飞，郑辉. 一种精确的QPSK信号信噪比估计算法. 通信学报，2004，25(2): 55-60. Xu Hua, Fan Long-fei, and Zheng Hui. A precise SNR estimation algorithm for QPSK signals. Journal on Communications, 2004, 25(2): 55-60. [3] Li B, DiFazio R, and Zeira A. A low bias algorithm to estimate negative SNRs in an AWGN channel[J].IEEE Communications Letters.2002, 6(11):469-471 [4] Wiesel A, Goldberg J, and Messer H. Non-data-aided signal-to-noise ratio estimation. Proc. IEEE ICC2002, New York, Apr. 28-May 2, 2002: 197-201. [5] Alagha N S. Cramer-Rao bounds of SNR estimates for BPSK and QPSK modulated signals[J].IEEE Communications Letters.2001, 5(1):10-12

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