An Improved Linear MMSE Detection Technique for Multi‐Carrier CDMA Systems: Comparison and Combination with Interference Cancellation Schemes
Jean‐Yves Baudais, Jean‐François Hèlard, Jacques Citerne · European Transactions on Telecommunications · 2000
Abstract In this paper, various detection techniques are studied in the synchronous case of a multiuser MC‐CDMA system operating in frequency selective Rayleigh channel. First of all, an improved linear detection approach named MMSE per user detection technique, which takes into account the despreading process, is presented. Simulation results over a Rayleigh fading channel show that this novel technique offers for non full load systems a significant gain compared to the MMSE equalization per camer method. Then, the performance of various parallel and successive interference cancellation techniques is compared to the performance of the linear MMSE per user scheme. When the power of the interferers is roughly equal to the power of the useful signal, the performance of the linear MMSE per user is really close to the performance of the non linear PIC and SIC schemes.