Analog joint source-channel coding over MIMO channels

Francisco J Vazquez-Araujo,Javier Garcia-Frias,Luis Castedo,Oscar Fresnedo

doi:10.1186/1687-1499-2014-25

Abstract

Analog joint source-channel coding (JSCC) is a communication strategy that does not follow the separation principle of conventional digital systems but has been shown to approach the optimal distortion-cost tradeoff over additive white Gaussian noise channels. In this work, we investigate the feasibility of analog JSCC over multiple-input multiple-output (MIMO) fading channels. Since, due to complexity constraints, directly recovering the analog source information from the MIMO channel output is not possible, we propose the utilization of low-complexity two-stage receivers that separately perform detection and analog JSCC maximum likelihood decoding. We study analog JSCC MIMO receivers that utilize either linear minimum mean square error or decision feedback MIMO detection. Computer experiments show the ability of the proposed analog JSCC receivers to approach the optimal distortion-cost tradeoff both in the low and high channel signal-to-noise ratio regimes. Performance is analyzed over both synthetically computer-generated Rayleigh fading channels and real indoor wireless measured channels.

Highlights

The splitting of source compression and channel coding is a fundamental design principle in digital communications known as the ‘separation principle’
Experimental results we present the results of several computer experiments that were carried out to illustrate the performance of the proposed multiple-input multiple-output (MIMO) analog joint source-channel coding (JSCC) transmission methods
Since directly recovering the analog source information from the MIMO channel output is not possible, we proposed the utilization of two-stage receivers that separately perform detection and analog JSCC decoding

Summary

Introduction

The splitting of source compression and channel coding is a fundamental design principle in digital communications known as the ‘separation principle’. Performance of analog JSCC is closer to the optimal distortion-cost curve when the non-linear mappings are used for bandwidth reduction. 2.2 Code optimization The performance of analog JSCC systems is measured in terms of the source signal-to-distortion ratio (SDR) with respect to the SNR.

Results

Conclusion