Spreading code adaptation for DS-CDMA with multipath

G. S. Rajappan*, Michael L Honig

*Corresponding author for this work

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

13 Scopus citations


We examine joint transmitter and receiver adaptation in a peer-to-peer Direct Sequence (DS)-Code Division Multiple Access (CDMA) system with multipath. The multipath channel is modeled as frequency-selective, slow fading, and each user adapts independently to minimize the Mean Squared Error (MSE) at the receiver. Transmitter adaptation serves to pre-equalize the channel, and to avoid multiple-access interference from other users. A class of adaptive algorithms are presented which jointly optimize the transmitter and receiver with limited side information. We compare the performance with that obtained when transmitters and receivers are jointly adapted to minimize the sum MSE over all users, which would be appropriate for the reverse link of a cellular system. Numerical results which illustrate convergence properties are shown for both Least Squares and matched filter (Rake) receivers.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE Military Communications Conference MILCOM
Number of pages5
StatePublished - Dec 1 2000
Event21st Century Military Communications Conference Proceedings MILCOM 2000 - Los Angeles, CA, United States
Duration: Oct 22 2000Oct 25 2000


Other21st Century Military Communications Conference Proceedings MILCOM 2000
Country/TerritoryUnited States
CityLos Angeles, CA

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Electrical and Electronic Engineering


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