Improved transmitter power control schemes for fading channel compensation

The purpose of this paper is to design a compensator that can adaptively change the power of the transmitter to reduce the transmitting error owing to the fading effect. This compensator is based on the technique of linear prediction filter (LPF). Owing to the magnitude of the fading coefficient might be close to zero, the receiver performance will be poor without any fade compensation at the transmitter. In this study, we use LPF and the delayed channel fade data to predict the following fading strength. Therefore the transmitted signals can be enhanced previously with a finite power, which in turn results in the raise the transmitting precision. We have implemented and compared different factors of the unbiased, biased, and least-mean-square based estimators. Several experimental results and detailed discussions are also provided to verify the characteristics of the proposal system.