Combining power control and blind equalization in wireless networks

Decentralized power control techniques achieve a target SINR (signal to interference-noise ratio) in wireless networks assuming knowledge of link gains and measurement of interference powers. We propose a joint power control-blind equalization algorithm that redefines the power control problem and importantly, does not need measurement of link gains and interference powers at the base station or sending a training sequence. We consider uplink transmission with multiple reception at each station. Convergence of the algorithm for low delay spread channels is shown theoretically and verified by simulation. The proposed scheme also enables users to achieve a desired bit error rate based directly on a selectable threshold. In the traditional scenario, an error in the assumed channel and array response causes a steep degradation in performance while our algorithm does nor degrade though there is error in the estimated response from blind equalization.