A grouping strategy for parallel group detection in synchronous gaussian CDMA channels

In this paper a group detection technique is addressed. After recalling some concepts of the decorrelating detector and the optimum multiuser detector, a parallel group detector which combines the advantages of both structures is introduced. The receiver derived here exploits the signal users´ correlation in an uplink synchronous code-division multiple access channel, resulting in a structure whose performance ranges from the decorrelating detector to the optimum multiuser detector, depending on the number of groups and on the number of users assigned to those groups. As in group detection the problem of how to compose groups arises, a grouping strategy that minimizes the bit error probability of the user with worst performance in the entire system is developed. Examples illustrating the performance of the proposed grouping strategy are also provided.