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Improved SNR estimation for BPSK and QPSK signals

Improved SNR estimation for BPSK and QPSK signals

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A novel non-data-aided SNR estimation technique for BPSK and QPSK modulations in complex additive white Gaussian noise (AWGN) is proposed. It uses the constant amplitude property of in-phase and quadrature components of these modulations to achieve an improved performance. Its complexity is shown to be lower while its accuracy supersedes the popular moments-based estimator, approaching closely to the Cramer-Rao lower bound.

References

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      • N.C. Beaulieu , A.S. Toms , D.R. Pauluzzi . Comparison of four SNR estimators for QPSK modulations. IEEE Commun. Lett. , 2 , 43 - 45
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      • Xu, H., Zheng, H.: `The simple SNR estimation algorithm for MPSK signals', Proc. Int. Conf. Signal Processing, (ICSP), August–September 2004, Bangalore, 2, p. 1781–1785.
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      • Ye, P.-J., An, J.-P.: `SNR estimation for constant envelope signals in AWGN channel', Proc. Int. Conf. on Wireless Communication, Networking and Mobile Computing, September 2005, 1, p. 525–528.
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      • Bakkali, M., Stéphenne, A., Affes, S.: `Iterative SNR estimation for MPSK modulation over AWGN channels', Proc. IEEE 64th Vehicular Technology Conf., (VTC), September 2006, Montreal, QC, Canada, p. 1–5.
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