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Multiuser receivers for code-division multiple-access systems with trellis-based modulation

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Title: Multiuser receivers for code-division multiple-access systems with trellis-based modulation
Author: Fawer, Urs; Aazhang, Behnaam
Type: Journal article
Keywords: multiuser detection; code-division multiple access (CDMA); coding; multistage detector; M-algorithm
Citation: U. Fawer and B. Aazhang, "Multiuser receivers for code-division multiple-access systems with trellis-based modulation," IEEE Journal in Selected Areas in Communication, vol. 14, no. 8, pp. 1602-1609, 1996.
Abstract: A code-division multiple-access (CDMA) communication system is studied where a trellis-based scheme is used for data encoding and modulation. The signature sequences (spreading codes), which are assigned to the direct-sequence spread-spectrum (DS/SS) modulator according to the encoding rule, are taken from a biorthogonal set. We derive the optimum detector by maximizing the likelihood ratio. In addition to the optimum multiuser detector with very high computational complexity, we present a multistage detector and a scheme based on a reduced tree search algorithm. The error probability is evaluated by deriving upper and lower bounds as well as by Monte Carlo simulations. We show that the optimum receiver is near-far resistant. The results from the numerical examples indicate that the suboptimum detectors are also capable of alleviating the near-far problem.
Date Published: 1996-10-20

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  • ECE Publications [1048 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students