MIMO Iterative Receiver with Bit Per Bit Interference Cancellation

In multi-antenna wireless systems, iterative receivers based on MMSE equalization allow to obtain good performance by efficiently cancelling interference. Complexity and latency are two important criteria in implementation of such iterative systems, even if receivers based on MMSE equalization are recognized to have a reasonable complexity. In classical sequencing of iterative receiver, equalization and channel decoding are iteratively and independently performed leading to peaks of calculation. In this paper, we propose to perform in parallel MIMO decoding and channel decoding by updating interference cancellation after each newly decoded bit. Thus, operations within the proposed receiver are uniformly distributed on iteration duration. Moreover, new information obtained owing to each decoding bit is used in the same decoding iteration to accelerate the process convergence. By this way, calculation power is evenly distributed on the iteration duration and number of iterations is reduced.