Multiuser Channel Estimation for Long Code CDMA Systems

dc.citation.bibtexNameinproceedingsen_US
dc.citation.conferenceNameWireless Communication and Networking Conferenceen_US
dc.contributor.authorBhashyam, Srikrishnaen_US
dc.contributor.authorAazhang, Behnaamen_US
dc.contributor.orgCenter for Multimedia Communications (http://cmc.rice.edu/)en_US
dc.date.accessioned2007-10-31T00:37:11Zen_US
dc.date.available2007-10-31T00:37:11Zen_US
dc.date.issued2000-09-20en_US
dc.date.modified2001-08-16en_US
dc.date.note2001-08-16en_US
dc.date.submitted2000-09-20en_US
dc.descriptionConference Paperen_US
dc.description.abstractChannel estimation techniques for code-division multiple access (CDMA) systems need to combat multiple access interference (MAI) effectively. Most existing estimation techniques are designed for CDMA systems with short repetitive spreading codes. However, current and next generation wireless systems use long spreading codes whose period is much larger than the symbol duration. In this paper, we derive the maximum likelihood channel estimate for long code CDMA systems over multipath channels using training sequences and approximate it using an iterative algorithm to reduce the computational complexity in each processing window. The asymptotic convergence of the mean of the iterative estimate to the actual channel is also shown. The effectiveness of the iterative channel estimator is demonstrated in terms of squared error in estimation as well as the bit error rate performance of a multistage detector based on the channel estimates. Finally, the proposed iterative channel estimation technique is extended to track slowly varying multipath fading channels using decision feedback. Thus, an MAI resistant multiuser channel estimate with reasonable computational complexity is derived for long code CDMA systems over multipath fading channels.en_US
dc.description.sponsorshipTexas Advanced Technology Programen_US
dc.description.sponsorshipNokiaen_US
dc.description.sponsorshipNational Science Foundationen_US
dc.identifier.citationS. Bhashyam and B. Aazhang, "Multiuser Channel Estimation for Long Code CDMA Systems," 2000.en_US
dc.identifier.urihttps://hdl.handle.net/1911/19733en_US
dc.language.isoengen_US
dc.subjectchannel estimationen_US
dc.subjectcode-division multiple access (CDMA) systemsen_US
dc.subjectmultiple access interference (MAI)en_US
dc.subjectmultipath fading channelsen_US
dc.subject.keywordchannel estimationen_US
dc.subject.keywordcode-division multiple access (CDMA) systemsen_US
dc.subject.keywordmultiple access interference (MAI)en_US
dc.subject.keywordmultipath fading channelsen_US
dc.titleMultiuser Channel Estimation for Long Code CDMA Systemsen_US
dc.typeConference paperen_US
dc.type.dcmiTexten_US
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