A blind adaptive decorrelating detector for CDMA systems

dc.citation.epage1541en_US
dc.citation.issueNumber8en_US
dc.citation.spage1530en_US
dc.citation.volumeNumber16en_US
dc.contributor.authorUlukus, S.en_US
dc.contributor.authorYates, R.D.en_US
dc.date.accessioned2016-02-08T10:44:17Z
dc.date.available2016-02-08T10:44:17Z
dc.date.issued1998en_US
dc.departmentDepartment of Computer Engineeringen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractThe decorrelating detector is known to eliminate multiaccess interference when the signature sequences of the users are linearly independent, at the cost of enhancing the Gaussian receiver noise. In this paper, we present a blind adaptive decorrelating detector which is based on the observation of readily available statistics. The algorithm recursively updates the filter coefficients of a desired user by using the output of the current filter. Due to the randomness of the information bits transmitted and the ambient Gaussian channel noise, the filter coefficients evolve stochastically. We prove the convergence of the filter coefficients to a decorrelating detector in the mean squared error (MSE) sense. We develop lower and upper bounds on the MSE of the receiver filter from the convergence point and show that with a fixed step size sequence, the MSE can be made arbitrarily small by choosing a small enough step size. With a time-varying step size sequence, the MSE converges to zero implying an exact convergence. The proposed algorithm is distributed, in the sense that no information about the interfering users such as their signature sequences or power levels is needed. The algorithm requires the knowledge of only two parameters for the construction of the receiver filter of a desired user: the desired user's signature sequence and the variance of the additive white Gaussian (AWG) receiver noise. This detector, for an asynchronous code division multiple access (CDMA) channel, converges to the one-shot decorrelating detector.en_US
dc.identifier.doi10.1109/49.730459en_US
dc.identifier.issn0733-8716
dc.identifier.urihttp://hdl.handle.net/11693/25408
dc.language.isoEnglishen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/49.730459en_US
dc.source.titleIEEE Journal on Selected Areas in Communicationsen_US
dc.subjectCode division multiple access (CDMA)en_US
dc.subjectDecorrelating detectoren_US
dc.subjectMultiuser detectionen_US
dc.subjectAdaptive filteringen_US
dc.subjectAlgorithmsen_US
dc.subjectCode division multiple accessen_US
dc.subjectStatistical methodsen_US
dc.subjectBlind adaptive multiuser detectoren_US
dc.subjectDecorrelating detectorsen_US
dc.subjectMultiuser detectionen_US
dc.subjectSignal detectionen_US
dc.titleA blind adaptive decorrelating detector for CDMA systemsen_US
dc.typeArticleen_US
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