Channel Quality Estimation Over Mobile Radio Channels with Applications

摘要

We propose a technique to measure channel quality in terms of signal to interference plus noise ratio, S/(I+N) for the transmission of signals over fading channels. For coded signals, the Euclidean distance metric associated with the Maximum Like-lihood(ML) sequence is used as a channel quality meassure. Simulations show that the filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes and at different mobile speeds. The average scaled ML decoder metric can be mapped to the S/(I+N) per symbol using a threshold based scheme. We propose the use of this S/(I+N) estimate for applications such as data rate adaptation, mobile assisted handoff and power control.