On Optimum Asymptotic Multiuser Efficiency of Randomly Spread CDMA

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Sedaghat MA, Müller R, Marvasti F
Zeitschrift: IEEE Transactions on Information Theory
Verlag: Institute of Electrical and Electronics Engineers (IEEE)
Jahr der Veröffentlichung: 2015
Band: 61
Heftnummer: 12
Seitenbereich: 6635-6642
ISSN: 0018-9448


Abstract


We extend the result by Tse and Verdu on the optimum asymptotic multiuser efficiency of randomly spread code division multiple access (CDMA) with binary phase shift keying input. Random Gaussian and random binary antipodal spreading are considered. We obtain the optimum asymptotic multiuser efficiency of a K-user system with spreading gain N when K and N -> infinity and the loading factor, (K/N), grows logarithmically with K under some conditions. It is shown that the optimum detector in a Gaussian randomly spread CDMA system has a performance close to the single user system at high signal-to-noise ratio when K and N. 8 and the loading factor, (K/N), is kept less than (log(3) K/2). Random binary antipodal matrices are also studied and a lower bound for the optimum asymptotic multiuser efficiency is obtained. Furthermore, we investigate the connection between detecting matrices in the coin weighing problem and optimum asymptotic multiuser efficiency. We obtain a condition such that for any binary input, an N x K random matrix, whose entries are chosen randomly from a finite set, is a detecting matrix as K and N -> infinity.



FAU-Autoren / FAU-Herausgeber

Müller, Ralf Prof. Dr.-Ing.
Professur für Informationsübertragung


Autor(en) der externen Einrichtung(en)
NTNU Trondheim - Norwegian University of Science and Technology
Sharif University of Technology / دانشگاه صنعتی شریف (SUT)


Zitierweisen

APA:
Sedaghat, M.A., Müller, R., & Marvasti, F. (2015). On Optimum Asymptotic Multiuser Efficiency of Randomly Spread CDMA. IEEE Transactions on Information Theory, 61(12), 6635-6642. https://dx.doi.org/10.1109/TIT.2015.2482483

MLA:
Sedaghat, Mohammad A., Ralf Müller, and Farokh Marvasti. "On Optimum Asymptotic Multiuser Efficiency of Randomly Spread CDMA." IEEE Transactions on Information Theory 61.12 (2015): 6635-6642.

BibTeX: 

Zuletzt aktualisiert 2018-08-08 um 17:40