Patent ID: 6775521
Filing Date: 2004-08-10
Classification: H04B,H04L

Abstract:
In a radio communication system, a method for operating a receiver to determine that a received speech frame is bad, the method comprising:receiving a plurality of bursts that make up the speech frame, wherein each of the plurality of bursts includes coded speech data and a received training sequence; for each of the plurality of bursts: performing a plurality of correlation operations on a respective received training sequence using a local sequence to produce a plurality of correlation sequences, each correlation sequence including a plurality of correlation values and being respective to a contiguous portion of the training sequence; separately summing the correlation values of the correlation sequences to produce a plurality of sums; based upon a maximum one of the plurality of sums determining an estimated signal power; determining an estimated noise power based upon the received training sequence; and based upon the estimated signal power and the estimated noise power, determining an estimated signal-to-noise ratio (ESNR) for the respective burst; and when the ESNR of the plurality of bursts compare unfavorably to an ESNR criteria, determining that the speech frame is bad.