Patent Document ID: 20030189979
Application ID: 10269606
Patent Flag: 0

Claim One:
1. A method for estimating signal-to-noise (SNR) ratio of a sequence of received BPSK communication symbols r k (k&equals;1 to N) using a low bias method comprising: a) selecting an initial estimate of signal-to-noise ratio SNR 0 ; b) calculating an initial amplitude value A 0 and noise variance value &sgr; 0 based on the estimate SNR 0 ; c) calculating a subsequent amplitude value A 1 based on probability density; d) calculating a subsequent noise variance value &sgr; 1 based on amplitude value A 1 ; e) calculating a subsequent signal-to-noise ratio SNR 1 based on A 1 and &sgr; 1 ; f) subtracting SNR 0 from SNR 1 to obtain a calculated resolution value; and g) adjusting SNR 0 and repeating steps (b) through (f) until the calculated resolution value is equal to a predetermined acceptable value.