Interference based Sub Carrier Group Assignment and Power Distribution for MCCDMA-MIMO System using Iterative Water Filling Game Theory

Sundhar Arumugam and Dananjayan Perumal

Keywords

MCCDMA Multi Carrier Code Division Multiple Access, MIMO Multiple Input Multiple output, QoS Quality of Service

Abstract

Multi carrier CDMA (MC-CDMA) combines the CDMA and OFDM technologies together and potentially offers the advantages of both the technologies. It becomes a very attractive and promising multiple access technique for high-rate data transmission in the future wireless communication systems. To accomplish MC-CDMA aspirations with high capacity and low BER in multipath wireless environment, it is governed by two main functions: power allocation and subcarriers group assignment. Power allocation deals with the sharing of available power over each carrier to maximize the system capacity. Group assignment depicts selection of appropriate subcarriers to support data rate requirements of individual users. The Multiple Input and Multiple Output (MIMO) system is another technique to increase the transmission rate without expanding the signal bandwidth. This paper is focused on interference based subcarrier group assignment strategy for MCCDMA-MIMO system to maximize the system capacity and minimize BER by restricting interference noise using water filling game theory based power control algorithm. The sub carrier group assignment is implemented by selecting best sub carriers with maximum SINR value and user’s QoS requirements. The performances of mean capacity and BER of the MCCDMA-MIMO system are evaluated with and without water filling algorithm.

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