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Pseudo-Decorrelating Multiuser Receivers for Asynchronous Code Division Multiple Access (CDMA) Systems in a Rayleigh Fading Environment

Joong-Hoo PARK, William H. TRANTER

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Summary :

A new type of a linear decorrelating receiver, named Pseudo-Decorrelator, for asynchronous code division multiple access systems over a Rayleigh fading multipath channel is presented in this paper. Starting with the analyis of the multiple access components of the decision statistics, the outputs of a bank of matched filters, the (K 3K) cross-correlation matrix for each bit is obtained. The non-square cross-correlation matrix is then inverted using the concept of Penrose's generalized inverse of a matrix. In this receiver, the detection process can be started before the whole sequence is received at the receiver, and computing the inverse of a (KN KN) cross-correlation matrix, generally required for linear decorrelating receivers, can be avoided because it is enough to compute only the generalized inverse of a (K 3K) cross-correlation matrix for each data bit. Here, K is the number of users and N is the length of input data sequence. Simulation results are also presented for K-user systems over a Rayleigh fading multipath channel.

Publication
IEICE TRANSACTIONS on Communications Vol.E82-B No.5 pp.721-730
Publication Date
1999/05/25
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Radio Communication

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