Power Control Algorithms in Wireless Communications
نویسندگان
چکیده
Power control in cellular systems is applied to numerous communication architectures. For Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA) power control reduces intercell interference and improves capacity. For Code Division Multiple Access (CDMA) power control is a required part of the base station and mobile station designs. Power Control reduces interference due to multiple users in the same frequency band. A general term that characterizes this type of multiple access interference is the “near-far effect”. Due to propagation characteristics the signals from mobiles closer to the base station could overpower the signals from mobiles located farther away. With power control each mobile adjusts its own transmit power to ensure an adequate quality of service (QoS) or signal-to-interference ratio (SIR) at the base station. The mobile’s transmit power is either increased or reduced depending on instructions from the base station (uplink power control). By reducing a user’s transmit power, that particular component in the multiuser interference is also reduced. While power control reduces the average required transmit power of
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