DSP Prototyping of Blind Adaptive MMSE Multiuser Detection for Cellular Wireless CDMA Systems

Blind adaptive Minimum Mean Square Error (MMSE) detection is theoretically one of the most promising multiuser detection techniques for cellular wireless CodeDivision Multiple Access (CDMA) systems, but its implementation has not yet been studied extensively. Therefore the goal of the research described in this paper is to study the implementation of blind adaptive MMSE detection on the current generation of DSPs and to determine the detectedbits-per-second performance that can be achieved by such an implementation. The blind adaptive MMSE detection algorithm is first analyzed in order to determine how it can be implemented. The algorithm is then implemented in a simulator and the simulator is used to study the adaptive behavior of the algorithm. The simulator is also used to verify the correctness of the implementation of the algorithm by comparing the simulation results obtained with the simulator to simulation results published in literature. When the algorithm is shown to be correct it is implemented on and optimized for a floating-point DSP. This DSP implementation is used to determine the detected-bits-per-second performance that can be achieved by blind adaptive MMSE detection on modern DSPs. Keywords—blind adaptive MMSE detection, CDMA, DSP prototyping, multiuser detection