Low correlation spreading codes for MUSA systems

Abstract

In this paper is investigated the performance of an uplink MIMO system when the multi-user shared access (MUSA) technique is applied. The complex spreading codes used in MUSA are created starting from the traditional PN codes that are used in the code division multiple access (CDMA) systems. We choose this approach to be sure that the obtained complex spreading codes have low correlation. The numerical results will help us conclude if our proposed method, to create complex spreading codes, is achieving the best performance when the modulated information is transmitted over a channel affected by Rayleigh fading, in an overloaded system. The results obtained by our method will be compared with the ones obtained when the complex spreading codes are created arbitrarily.