A Bidirectional Processing Receiver for Layered

In this paper, we present a new receiver structure for layered space-time multiple-input multiple-output (MIMO) systems based on non-linear interference cancelation. The main idea of the proposed receiver is to use a bidirectional processing approach, where spatial filtering and interference subtraction start simultaneously at the first and last layers and proceed successively towards the central layer in a parallelized manner. The proposed bidirectional processing receiver has two main advantages compared to traditional successive interference cancelation (SIC) detectors: i) the processing delay can be reduced by a factor of two at the expense of a parallel processing unit and ii) the bit-error-rate performance can be considerably improved due to the increased diversity gain obtained across the detection layers. Moreover, our bidirectional processing receiver exhibits the same performance as the recently proposed backward recursion based receiver [6] at a reduced processing time. Simulation results are provided to confirm the merits of the proposed receiver in terms of uncoded bit-error-rate.