List Sphere Decoding Combined with Linear Detection-Based Iterative Soft Interference Cancellation Via Exit Chart

Iterative list sphere decoding (LSD) can achieve near capacity on a multiple-antenna channel, however, with a rather high complexity. In order to reduce the complexity, in this paper, linear detection-based iterative soft interference cancellation (ISIC) instead of LSD is applied at the second and later iterations. We propose to exploit extrinsic information transfer (EXIT) chart analysis to select a specific ISIC to alleviate large performance degradation. Here MF-based and MMSE-base iterative soft interference cancellations (ISIC) are selected to be combined with the LSD. Simulation shows that the iterative combined detections have little signal-to noise ratio (SNR) loss and a much lower complexity in comparison with iterative LSD.