Method and apparatus providing unbiased signal-to-noise...

Details Method and apparatus providing unbiased signal-to-noise... Method and apparatus providing unbiased signal-to-noise...

2006-04-11

2006-04-11

Burd, Kevin (Department: 2631)

Pulse or digital communications

Testing

Signal noise

C375S346000, C375S147000

Reexamination Certificate

active

07027496

ABSTRACT:
Disclosed are a method and an apparatus to estimate a signal-to-noise ratio (SNR) of a signal. The method includes sampling the signal, correlating and channel estimating the sampled signal, symbol combining the correlated and channel estimated signal, such as by using a maximal-ratio combining technique, estimating pilot channel and noise power to obtain a combined pilot power and noise variance estimate and inputting the symbol combined signal and the pilot power and noise variance estimate to an Eb/Nt (SNR) estimator. The method further includes, in the Eb/Nt estimator, subtracting a noise term, multiplied by a constant, from the combined signal power and computing a ratio of the unbiased signal power to the noise power to obtain an unbiased (Eb/Nt) estimate. Having obtained obtain the unbiased (Eb/Nt) estimate, the method may integrate the unbiased (Eb/Nt) estimate for a frame duration and compare the integrated unbiased (Eb/Nt) value to a predetermined threshold value to make a decision as to whether the frame was a transmitted frame or an untransmitted (DTX) frame.

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