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Performance analysis of a cooperative multiple access relaying scheme

The problem of transmitting data from one base station to multiple user mobile stations through some multiple antenna relay stations is studied in this paper. The links between the base station and relays are considered error free and ideal. Therefore, decode and forward strategy is used and we study the downlink between relays and mobile stations. A method to optimize the precoding vector in relays to cancel out multiple access interference and to maximize the signal to noise ratio at the mobile stations is proposed in this paper. We show by Mont-Carlo simulation and a semi-analytic method that maximum diversity advantage can be obtained. We show that the diversity advantage is a simple function of the system parameters: number of relays, number of antennas and the number of users.