Ecole d'ingénieur et centre de recherche en Sciences du numérique

Blind and semi-blind single user receiver techniques for asynchronous CDMA in multipath channels

Ghauri, Irfan;Slock, Dirk T M

GLOBECOM 1998, IEEE Global Telecommunications Conference ("The bridge to global integration"), November 8-12, 1998, Sydney, Australia

Prix d'excellence Hewlett-Packard

We consider multiple users in an asynchronous DS-CDMA system operating in a multipath environment. The received cyclostionary spread signal sampled at the chip rate is converted to a stationary vector signal,leading to a linear multichannel model. Linear receivers for multiple access interference (MAI) suppression are studied with emphasis on computationally simple algorithms. The desired user channel estimate is obtained by a new blind technique using the spreading sequence properties and second-order statistics. A blind MMSE-ZF receiver is subsequently obtained. Equivalence to the anchored MOE receiver is shown. Since the blind receiver relies on the inversion of the signal covariance matrix RY Y , a consistent estimate of which requires a large number of data points if a large number of users are concurrently active, a semi-blind alternative for the estimation of the interference canceling filter is presented. Iterative improvements of this estimate based upon exploitation of the finite-alphabet are investigated. Performances of different interference cancellation schemes are compared in terms of the output signal-to-interference-plus-noise ratio (SINR).

Document Doi Bibtex

Titre:Blind and semi-blind single user receiver techniques for asynchronous CDMA in multipath channels
Département:Systèmes de Communication
Eurecom ref:189
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Bibtex: @inproceedings{EURECOM+189, doi = {}, year = {1998}, title = {{B}lind and semi-blind single user receiver techniques for asynchronous {CDMA} in multipath channels}, author = {{G}hauri, {I}rfan and {S}lock, {D}irk {T} {M}}, booktitle = {{GLOBECOM} 1998, {IEEE} {G}lobal {T}elecommunications {C}onference ("{T}he bridge to global integration"), {N}ovember 8-12, 1998, {S}ydney, {A}ustralia}, address = {{S}ydney, {AUSTRALIE}}, month = {11}, url = {} }
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