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Information Theoretic Analysis of LDS Scheme

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4 Author(s)
Razavi, R. ; Centre for Commun. Syst. Res., Univ. of Surrey, Guildford, UK ; Hoshyar, R. ; Imran, M.A. ; Wang, Y.

In this paper, the capacity region of Low Density Signature Multiple Access Channel (LDS-MAC) is calculated through information theoretic analysis. LDS Code Division Multiple Access (LDS-CDMA) uses spreading sequences of low density for spreading the data symbols in time domain. This technique benefits from a less complex Multiuser Detector (MUD) compared to conventional CDMA with optimum MUD; while keeping the performance close to the single user scenario for up to 200% loaded conditions. Also evaluated is the effect of different factors on the capacity of LDS MAC.

Published in:

Communications Letters, IEEE  (Volume:15 ,  Issue: 8 )