Low bias estimation of small signal-to-noise ratio

Details Low bias estimation of small signal-to-noise ratio Low bias estimation of small signal-to-noise ratio

2008-05-20

2008-05-20

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Testing

Signal noise

C375S229000, C375S346000, C375S347000, C375S348000, C375S249000, C375S350000, C702S069000

Reexamination Certificate

active

07376178

ABSTRACT:
An apparatus and method for estimation of signal-to-noise ratio (SNR) with low bias that is effective for both positive SNRs and small to negative SNRs. The estimation is based on an iterative solution for the maximum likelihood estimate of the amplitude from which the SNR can be computed. The estimation is applicable for various modulated systems, including BPSK, QPSK and MPSK.

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Beaulieu et al., “Comparison of Four SNR Estimators for QPSK Modulations,” IEEE Communications Letters, vol. 4, No. 2, Feb. 2000, pp. 43-45.
Matzner et al., “An SNR Estimation Algorithm Using Fourth-Order Moments,” IEEE Int. Symp. Inform. Theory, Trondheim, Norway, Jun. 1996, p. 119.

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