Distributed power balancing in a CDMA network

Pao Yue-kong Library Electronic Theses Database

Distributed power balancing in a CDMA network


Author: Wong, Sze-pong Wilson
Title: Distributed power balancing in a CDMA network
Degree: M.Sc.
Year: 1998
Subject: Code division multiple access
Mobile communication systems
Cellular telephones
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic Engineering
Pages: iii, 131 leaves : ill. ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1441888
URI: http://theses.lib.polyu.edu.hk/handle/200/2965
Abstract: Frequency reuse increases the capacity of a cellular system but results in co-channel interference. Several power control schemes to optimize the transmitter power in a TDMA system has been investigated in [1], [2], [3]. However, the convergence speed to obtain the optimum value is too slow to be acceptable in a real cellular system. A new algorithm, that improves the convergence speed is developed. Furthermore, the developed algorithm removes the problem of high transmit power in the iteration formula found in [2]. The developed algorithm has been applied to both single and multi-cell CDMA system. A large number of simulation results are reported in this dissertation. It is shown that an error of less than 1 dB to the optimum C/I value is usually obtained. The performance of this algorithm in the presence of fading is evaluated. The dynamic system behaviour when a new user enters the system as well as when an existing user leaves the system is also studied. It is found that the convergence to an optimum C/I value is slower when a new user enter the system.

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