Title :
Optimum TPC command sequence in WCDMA
Author :
Chaoyang, Chen ; Baoling, Liu ; Qingyi, Quan ; Ping, Zhang
Author_Institution :
Beijing Univ. of Posts & Telecommun., China
Abstract :
In a WCDMA system, the single-bit adaptive step-size closed-loop power control scheme is popularly investigated. But the only information which the transmitter can apply to adjust the transmit power is the received TPC command sequence. On the other hand, we need a reference TPC command sequence (we call it the optimum TPC command sequence), if the transmitter receives such a TPC command, the SIR at the receiver meets the quality of service demand. To compare the optimum TPC command sequence with the transmitter received TPC command sequence, we can choose the step-size according to the amount of the difference between them. In this paper, we investigate the characters of the optimum TPC command sequence under some typical radio channel by computer simulation; it is found that the 0 and 1 alternative sequence is an optimum TPC command sequence
Keywords :
Rayleigh channels; adaptive control; broadband networks; closed loop systems; code division multiple access; mobile radio; power control; quality of service; radio transmitters; sequences; telecommunication control; W-CDMA; WCDMA; adaptive step-size closed-loop power control; optimum TPC command sequence; quality of service demand; radio channel; receiver; step-size; transmit power; transmitter; Adaptive control; Adaptive filters; Interference; Multiaccess communication; Power control; Programmable control; Quality of service; Radio transmitters; Signal processing; Stochastic processes;
Conference_Titel :
Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on
Conference_Location :
Beijing
Print_ISBN :
0-7803-7010-4
DOI :
10.1109/ICII.2001.983566
