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Sparse index multiple access for multi-carrier systems with precoding

journal contribution
posted on 2016-06-01, 00:00 authored by Jinho ChoiJinho Choi
In this paper, we consider subcarrier-index modulation (SIM) for precoded orthogonal frequency division multiplexing (OFDM) with a few activated subcarriers per user and its generalization to multi-carrier multiple access systems. The resulting multiple access is called sparse index multiple access (SIMA). SIMA can be considered as a combination of multi-carrier code division multiple access (MC-CDMA) and SIM. Thus, SIMA is able to exploit a path diversity gain by (random) spreading over multiple carriers as MC-CDMA. To detect multiple users' signals, a lowcomplexity detection method is proposed by exploiting the notion of compressive sensing (CS). The derived low-complexity detection method is based on the orthogonal matching pursuit (OMP) algorithm, which is one of greedy algorithms used to estimate sparse signals in CS. From simulation results, we can observe that SIMA can perform better thanMC-CDMA when the ratio of the number of users to the number of multi-carrier is low.

History

Journal

Journal of communications and networks

Volume

18

Pagination

439-445

Location

Piscataway, N.J.

ISSN

1229-2370

Language

eng

Publication classification

C Journal article, C1.1 Refereed article in a scholarly journal

Copyright notice

2016, KIC

Issue

3

Publisher

Institute of Electrical and Electronics Engineers