Title :
Information Theoretic Analysis of LDS Scheme
Author :
Razavi, R. ; Hoshyar, R. ; Imran, M.A. ; Wang, Y.
Author_Institution :
Centre for Commun. Syst. Res., Univ. of Surrey, Guildford, UK
fDate :
8/1/2011 12:00:00 AM
Abstract :
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.
Keywords :
code division multiple access; multi-access systems; multiuser detection; time-domain analysis; LDS-CDMA; MAC; MUD; code division multiple access; information theoretic analysis; low density signature multiple access channel; multiuser detector; time domain; Complexity theory; Decoding; Fading; Multiaccess communication; Multiuser detection; Receivers; Simulation; Capacity; low density signature; multi-path fading channel;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2011.061011.102098
