Predictive Linear Quadratic Power Control Algorithm in WCDMA Wireless Cellular Networks

Abstract

Rake recei ver MRC Li nk gai n Power cont r ol Sl ow f adi ng channel p ∆ ± Tp Integrator user1 user1 userN userN Base st at i on Mobi l e t er m i nal Channel par am et er s (dB) Tr ansm i tt ed power (dB) + + Abstract-Combining the approaches of optimal control theory and linear prediction technique, the user's transmitting powers are minimized and the system capacity is maximized with the quality of services (QoS) being satisfied simultaneously for all mobile terminals. A linear quadratic form of power control problem in wideband code division multiple access (WCDMA) systems is established and the fading channel path-gain is predicted. Simulation results show graphically that the proposed predictive linear quadratic power control (PLQ-PC) algorithm converges faster no less than 7 percents and makes the system support about 1.2 times users compared with those obtained by auto-tuning fuzzy power control (ATF-PC) and signalinterference ratio based power control (SIR-PC) algorithms, respectively.