Precoded spatial multiplexing MIMO system with spatial component interleaver.

Xiang Gao,Zhanji Wu

doi:10.1186/s13638-016-0558-8

Abstract

In this paper, the performance of precoded bit-interleaved coded modulation (BICM) spatial multiplexing multiple-input multiple-output (MIMO) system with spatial component interleaver is investigated. For the ideal precoded spatial multiplexing MIMO system with spatial component interleaver based on singular value decomposition (SVD) of the MIMO channel, the average pairwise error probability (PEP) of coded bits is derived. Based on the PEP analysis, the optimum spatial Q-component interleaver design criterion is provided to achieve the minimum error probability. For the limited feedback precoded proposed scheme with linear zero forcing (ZF) receiver, in order to minimize a bound on the average probability of a symbol vector error, a novel effective signal-to-noise ratio (SNR)-based precoding matrix selection criterion and a simplified criterion are proposed. Based on the average mutual information (AMI)-maximization criterion, the optimal constellation rotation angles are investigated. Simulation results indicate that the optimized spatial multiplexing MIMO system with spatial component interleaver can achieve significant performance advantages compared to the conventional spatial multiplexing MIMO system.

Highlights

Coded modulation is one of the pivotal techniques of wireless communications
6.1 Results of singular value decomposition (SVD)-precoded scheme In order to verify the effectiveness of the proposed optimum spatial Q-component interleaver, the BER performance compared with commonly used cyclic Qcomponent interleaver proposed in (24) is presented for NR = NT = 8 3/4-rate BCC-coded multiple-input multiple-output (MIMO) systems
6.2 Results of limited feedback (LF) precoded scheme For the proposed scheme with LF precoding and zero forcing (ZF) receiver, simulations are carried out to compare the performance of different percoding matrix selection criteria

Summary

Introduction

Coded modulation is one of the pivotal techniques of wireless communications. High spectral efficiency and link reliability are always the challenges and goals of wireless communication systems. In [40], a novel coordinate-interleaved spatial multiplexing (CISM) scheme based on SVD precoding is proposed. Channel encoding is added to the CISM scheme and a similar precoded BICM spatial multiplexing MIMO system with spatial component interleaver among transmit layers is studied. The optimum spatial Q-component interleaver design criterion for the proposed CISM scheme with SVD precoding is discussed. Based on the linear zero forcing (ZF) receiver, in order to minimize a bound on the average probability of a symbol vector error, a novel effective SNR-based precoding matrix selection criterion and a simplified criterion that are suitable for the proposed MIMO scheme are proposed. Simulation results verify the theoretical analysis and show that the optimized spatial multiplexing MIMO system with spatial component interleaver can achieve significant performance advantages. According to the LLRs, the information bits are decoded via channel decoder

Performance analysis of the proposed scheme with SVD precoding

Limited feedback precoding for the proposed scheme

Instead of the calculation of effective SNR for each layer that is related to

Optimal rotation angle based on AMI analysis

BICM-AMI of the proposed schemes

Determination method of optimal rotation angle

Conclusions