Information Theoretic Analysis of LDS Scheme

• Published in: IEEE communications letters Vol. 15; no. 8; pp. 798 - 800
• Main Authors: Razavi, R., Hoshyar, R., Imran, M. A., Wang, Y.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Applied sciences; Capacity; Channels; Code division multiple access; Complexity theory; Decoding; Density; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Fading; Information theory; Information, signal and communications theory; low density signature; Mathematical analysis; Mud; multi-path fading channel; Multiaccess communication; Multiple access; Multiuser detection; Optimization; Receivers; Signal and communications theory; Signal, noise; Simulation; Spreading; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmission and modulation (techniques and equipments); Access control; Multiuser detection; Performance evaluation; Fading; low density signature; Multiple access; Wireless telecommunication; Multipath channels; Information analysis; multi-path fading channel; Time domain method; Capacity; Code division multiple access; Multiple channel; Signal detection; Information theory
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2011.061011.102098

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.