Closed-loop Precoding Based on Code Distance Allocation for Transmit Correlated Spatial Multiplexing MIMO Systems

Abstract

When MIMO channel correlation information is available at the transmitter, closed-loop precoding can be introduced to improve system performance. In this paper, we proposed a novel closed-loop precoding algorithm based on code distance allocation for transmit correlated spatial multiplexing MIMO systems. We show that pairwise error probability of transmit correlated spatial multiplexing MIMO systems is determined by the minimum transmit code distance allocated to each eigenmode subchannel. We give the structure of code distance allocation matrix to optimize transmit code distance. Our proposed structure of code distance allocation matrix can simultaneously optimize minimum code distance allocated to each subchannel. Computer simulations show that our proposed procoding algorithm can improve the performance of transmit correlated spatial multiplexing systems