Carrier-to-interference ratio measurement using moments or histograms

Cochannel interference is often the predominant factor that limits the capa city of a cellular mobile radio system. Power control is thus needed so tha t carrier-to-cochannel interference ratio (CIR) can be maintained within a tolerable bound. Many power control algorithms that require real-time CIR m easurement have been proposed but there is very few mentioning of the measu rement method, This paper presents viable solutions for real-time CIR estim ations under various channel conditions. These solutions are based on eithe r the method of moments or the histogram matching concept. We provide numer ical results to demonstrate the usefulness and to compare the performance o f the proposed algorithms. It is found that the histogram matching method w ith a properly-designed nonuniform quantizer offers excellent CIR estimatio n.