Abstract
The interference reduction capability of cell sectoring and power control algorithms have been considered separately as means to decrease the interference in Code Division Multiple Access (CDMA) cellular systems. In this paper, we present Switched-Beam (SB) and Rotatable Equal Sectoring (RES) techniques for CDMA cellular systems in a 2D urban environment. In the SB technique by using a number of fixed, independent, or directional antennas we increase the downlink capacity of the CDMA systems. Also in the RES method, the equal sectors of the base stations are rotating together to decrease the inter-cell and intra-cell interferences. Also in this paper we use centralized power control to overcome the near-far problem. Simulation results indicate that the proposed techniques considerably increase the capacity of the CDMA cellular systems compared to ordinary Equal Sectoring (ES) method.
Highlights
Code-division multiple access (CDMA) for cellular communication networks requires the implementation of some forms of adaptive power control
We mainly focus on sectoring in a multi-cell Code Division Multiple Access (CDMA) system and only the downlink of cellular system is considered
Technique, number of beams is chosen such that SINR of each user remains between γmin and γmax under minimizing the transmitted power of each base station
Summary
Code-division multiple access (CDMA) for cellular communication networks requires the implementation of some forms of adaptive power control. A network center can simultaneously compute the optimal power levels for all users It requires measurement of all the link gains and the communication overhead between a network center and base stations [7]. Distributed power control, on the other hand, uses only local information to determine transmitter power levels. The diversity scheme can be divided into three methods: 1) the space diversity; 2) the time diversity; 3) the frequency diversity [1] In these schemes, the same information is first received (or transmitted) at different locations (or time slots/ frequency bands). The same information is first received (or transmitted) at different locations (or time slots/ frequency bands) After that, these signals are combined to increase the received SINR.
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