Overloaded multiple access systems: A generalized model and a low-complexity multiuser decoder

Meng Che Chang, Yu-Ted Su*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Several works have emerged in the past decade that can potentially provide higher spectral efficiency than that offered by existing orthogonal-channelization based air interfaces for a fixed bandwidth expansion factor. Among them, the interleave division multiple access (IDMA) and low-density spreading CDMA (LDS-CDMA) are of special interest because of their overloading capability. In this paper, we present a unified system structure that encompasses both systems. We call this unified structure as codeword interleaved LDS CDMA (cILDS-CDMA) and present an iterative decoding structure. We analyze the decoder performance via an EXIT-chart like approach and demonstrate the advantage of low density (sparse) spreading. Numerical results in AWGN channel show that LDS reduces the decoding latency and the cILDS-CDMA scheme also offer a larger diversity gain in frequency selective fading channels.

Original languageEnglish
Title of host publication2016 9th International Symposium on Turbo Codes and Iterative Information Processing
Subtitle of host publicationPaths to 5G and Beyond, ISTC 2016
PublisherIEEE Computer Society
Pages231-235
Number of pages5
ISBN (Electronic)9781509034017
DOIs
StatePublished - 17 Oct 2016
Event9th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2016 - Brest, France
Duration: 5 Sep 20169 Sep 2016

Publication series

NameInternational Symposium on Turbo Codes and Iterative Information Processing, ISTC
Volume2016-October
ISSN (Print)2165-4700
ISSN (Electronic)2165-4719

Conference

Conference9th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2016
CountryFrance
CityBrest
Period5/09/169/09/16

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