ar X iv : 1 30 4 . 61 54 v 1 [ cs . I T ] 2 3 A pr 2 01 3 ADAPTIVE ITERATIVE DECISION FEEDBACK DETECTION ALGORITHMS FOR MULTI - USER MIMO SYSTEMS

An adaptive iterative decision multi-feedback detection algorithm with constellation constraints is proposed for multiuser multiantenna systems. An enhanced detection and interference cancellation is performed by introducing multiple constellation points as decision candidates. A complexity reduction strategy is developed to avoid redundant processing with reliable decisions along with an adaptive recursive least squares algorithm for time-varying channels. An iterative detection and decoding scheme is also considered with the proposed detection algorithm. Simulations show that the proposed technique has a complexity as low as the conventional decision feedback detector while it obtains a performance close to the maximum likelihood detector.