Adaptive Multiuser Receivers Scheme for MIMO OFDM over Iterative- Equalization for Single-Carrier Transmission

Mobile and Wireless Communication Department, Medway School of Engineering, The University of Greenwich, United Kingdom. Corresponding Author: Titus Eneh __________________________________________________________________________________________ Abstract Adaptive multiuser receivers scheme for MIMO OFDM over Iterative-Equalization for Single-Carrier Transmission, which we refer to as Iterative AMUD MIMO OFDM. It involves the joint iteration of the adaptive minimum mean square error multiuser detection and decoding algorithm with prior information of the channel and interference cancelation in the spatial domain. A partially filtered gradient LMS (Adaptive) algorithm is also applied to improve the convergence speed and tracking ability of the adaptive detectors with slight increase in complexity. The proposed technique is analyzed in slow and fast Rayleigh fading channels in MIMO OFDM systems. The Adaptive Multiuser Detection for MIMO OFDM system (AMUD MIMO OFDM) performs as well as the iterative equalization for single-carrier for higher modulation scheme. The LMS algorithm and maximum a posterior (MAP) algorithm are utilized in the receiver structures. The results of the higher modulation schemes shows that as the modulation order increases, a higher S/R is required to obtain the same BER performance at a lower order. The iterative gain is greater for higher modulation orders as compared with lower modulation __________________________________________________________________________________________