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Journal Articles IEEE Transactions on Information Theory Year : 2015

Spectral Efficiency of Random Time-Hopping CDMA

Abstract

Traditionally paired with impulsive communica- tions, time-hopping code-division multiple access (TH-CDMA) is a multiple access technique that separates users in time by coding their transmissions into pulses occupying a subset of Ns chips out of the total N included in a symbol period, in contrast with the traditional direct-sequence CDMA (DS-CDMA), where Ns = N. This paper analyzes the TH-CDMA with random spreading, by determining whether peculiar theoretical limits are identifiable, with both optimal and suboptimal receiver structures, in particular in the archetypal case of sparse spreading, that is, Ns = 1. Results indicate that the TH-CDMA has a fundamentally different behavior than DS-CDMA, where the crucial role played by energy concentration, typical of TH, directly relates with its intrinsic uneven use of degrees of freedom.

Dates and versions

hal-01340299 , version 1 (30-06-2016)

Identifiers

Cite

G.C. Ferrante, Maria-Gabriella Di Benedetto. Spectral Efficiency of Random Time-Hopping CDMA. IEEE Transactions on Information Theory, 2015, 61 (12), pp.6643-6662. ⟨10.1109/tit.2015.2490218⟩. ⟨hal-01340299⟩
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