SYSTEM AND METHOD FOR MEASURING QUALITY OF CHANNEL INFORMATION

摘要

PROBLEM TO BE SOLVED: To provide the system and method that measures quality of a channel based on S/N for the purpose of sending a coded signal through a fading channel. SOLUTION: A Viterbi decoder 56 with respect to a maximum likelihood is used for a measure of channel quality. The measure of the Euclid distance is filtered to smooth a short-term fluctuation. The smoothed or filtered measure is a channel quality measure that is consistent with and reliable for different code modulation systems and different mobile speeds. The filtered measure is mapped for the S/N per symbol by using a threshold level method. This tacit S/N estimate is used adaptively for a hand-off and a data rate of mobile aid model in a transmitter.