An Improved Decorrelator MUD for Asynchronous MC-CDMA with Extended Observation Window

In this paper we present and analyze an improved decorrelator MUD for asynchronous multi-carrier code division multiple access (MC-CDMA) systems with extended observation window. Specifically, we extend the receivers observation window from one symbol duration to two symbol durations enabling the receiver to completely harness the energy of the data symbol in the ith block in one shot. Hence, unlike previously proposed MUDs for asynchronous MC-CDMA, our approach remove the need to resynchronize to each users´ symbol to detect all users´ data. Furthermore, we analyze the decorrelator MUD in detail and propose several methods to improve its bit-error- rate performance resulting in gain of upto 2 dB relative to the traditional decorrelator MUD proposed in ([1]-[3]).