Fri, 08 Aug 2008 19:46:26 BST CiteULike: dcastros Ren http://www.citeulike.org/user/dcastro/author/Ren CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2782013 <i>Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on], Vol. 52, No. 6. (2005), pp. 336-338.</i><br /><br />Signal-to-noise ratio (SNR) measurement is required in many receivers and systems of communications. In this brief, we derive a new SNR's estimator based on the second and fourth-order moments of the complex signals of quadrature phase-shift keying modulations. The mean square error of the estimated SNR by the proposed algorithm is smaller than that by other methods for a low SNR with limited samples. A new SNR's estimator for QPSK Modulations in an AWGN channel Guangliang Ren Yilin Chang Hui Zhang doi:10.1109/TCSII.2005.849008 Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on], Vol. 52, No. 6. (2005), pp. 336-338. 2008-05-09T23:47:09-00:00 2005 Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on] 52 6 336 338 channel estimator modulation noise qpsk snr