Adaptive Closed-Loop Power Control Algorithms for CDMA Cellular Communication Systems

Power Control in Ad Hoc Networks

“…In open loop power control, the mobile user adjusts its transmission power based on the received signaling power from the base station (Chockalingam & Milstein, 1998). In closed-loop power control, based on the measurement of the link quality, the base station sends a power control command instructing the mobile to increase or decrease its transmission power level and sets the target signal-to-interference ratio (SIR)tosuchalevel that sufficient quality of service is guaranteed (Rintamäki, 2002). Power can be controlled in a centralized or distributed fashion.…”

Reverse Link Performance of DS-CDMA Cellular Systems through Closed-Loop Power Control and Beamforming in 2D Urban Environment

“…The distributed closed-loop power control problem has been investigated by many researchers from many perspectives during recent years [4], [24], [27]- [29]. For instance, the conventional fast closed-loop power control strategy used in practice in CDMA systems is a fixed step controller based on SINR measurements.…”

“…For instance, the conventional fast closed-loop power control strategy used in practice in CDMA systems is a fixed step controller based on SINR measurements. The fixed step closed-loop power control (FSPC) algorithm is defined by [4] ( ) Also, the distributed traditional closed-loop power control (DTPC) is defined by [24] It should be mentioned that convergence speed of DTPC algorithm is higher than FSPC algorithm. Also, the variance of the SINR mis-adjustment in FSPC algorithm is higher than DTPC algorithm.…”

“…The command is transmitted to the transmitter in the feedback link and the transmitter adjusts its power at time ( )t n 1 + ′ according to the command. It should be mentioned that since the power control signaling is standardized, the loop delays are known exactly [4].…”

Framework for Random Power Allocation of Wireless Sensor Networks in Fading Channels

“…This is known as closed-loop power control which is used mainly to mitigate distance and shadowing losses, fast fading, and most importantly to overcome the near-far effect in co-channel multiuser wireless communication systems (see e.g. [3][4][5][6][7][8]). However, when we discuss about naturally deaf sensor nodes, it becomes totally tricky how to optimize the transmission parameters (power, modulation-level, etc.).…”