Coded Closed-Loop Power Control Over Wireless Channels

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Executive Summary

Closed-Loop Power Control (CLPC) solves near-far problems by effectively compensating wireless fading (shadow and multipath fading) loss with timely control of Mobile Station (MS) transmission power from the Base Station (BS). The BS periodically transmits Power Control Command Bit(s) (PCCB) to its MSs via the downlink channels, where the power control period p T is called the Power Control Group (PCG). In practice, CDMA (like W-CDMA or CDMA-2000) CLPC schemes have no channel error protection for PCCB, due to fast power control. Thus, the PCCB size, denoted as p L (unit: bit), is typically limited to one.

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