Timing-free code-aided blind adaptive joint MAI and ISI suppression in dispersive CDMA channels

Stefano Buzzi, Marco Lops, H. Vincent Poor

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The problem of joint multiaccess interference (MAI) and intersymbol interference (ISI) suppression in DS/CDMA systems operating over fading dispersive channels is considered. A timing-free, blind and code-aided detection algorithm is proposed, i.e. the procedure requires knowledge of neither the interfering users' parameters (spreading codes, timing offsets and propagation channels), nor the timing and channel impulse response of the user of interest, but only of its spreading code. The proposed structure is a two-stage one. The first stage is aimed at suppressing the multiuser interference, while the second-stage performs channel estimation and data detection. The proposed system is shown to incur a very limited loss with respect to the non blind MMSE detector; moreover, it outperforms other previously known blind systems, and is near-far resistant. A major advantage of the new structure is that it admits an adaptive implementation with quadratic (in the processing gain) computational complexity. This adaptive algorithm, which couples a recursive-leastsquares estimation of the blocking matrix and subspace tracking techniques, achieves effective steady-state performance.

Original languageEnglish (US)
Title of host publicationIEEE Wireless Communications and Networking Conference, WCNC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages542-548
Number of pages7
ISBN (Electronic)0780373766
DOIs
StatePublished - Jan 1 2002
Event2002 IEEE Wireless Communications and Networking Conference, WCNC 2002 - Orlando, United States
Duration: Mar 17 2002Mar 21 2002

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
Volume2
ISSN (Print)1525-3511

Other

Other2002 IEEE Wireless Communications and Networking Conference, WCNC 2002
CountryUnited States
CityOrlando
Period3/17/023/21/02

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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