Blind Adaptive and Iterative Algorithms for Decision-Feedback DS-CDMA Receivers in Frequency-Selective Channels
In this paper, we examine blind adaptive and iterative decision-feedback (DF) receivers for direct-sequence code-division multiple-access systems in frequency-selective channels. Code-constrained minimum variance and constant modulus design criteria for DF receivers based on constrained optimization...
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| Published in: | IEEE transactions on vehicular technology Vol. 56; no. 2; pp. 605 - 618 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
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New York, NY
IEEE
01.03.2007
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 0018-9545, 1939-9359 |
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| Abstract | In this paper, we examine blind adaptive and iterative decision-feedback (DF) receivers for direct-sequence code-division multiple-access systems in frequency-selective channels. Code-constrained minimum variance and constant modulus design criteria for DF receivers based on constrained optimization techniques are investigated for scenarios subject to multipath. Computationally efficient blind adaptive stochastic gradient and recursive least squares algorithms are developed for estimating the parameters of DF detectors along with successive, parallel, and iterative DF structures. A novel successive parallel arbitrated DF scheme is presented and combined with iterative techniques for use with cascaded DF stages in order to mitigate the deleterious effects of error propagation. Simulation results for an uplink scenario assess the algorithms and the blind adaptive DF detectors against linear receivers and evaluate the effects of error propagation of the new cancellation techniques against previously reported approaches. |
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| AbstractList | In this paper, we examine blind adaptive and iterative decision-feedback (DF) receivers for direct-sequence code-division multiple-access systems in frequency-selective channels. Code-constrained minimum variance and constant modulus design criteria for DF receivers based on constrained optimization techniques are investigated for scenarios subject to multipath. Computationally efficient blind adaptive stochastic gradient and recursive least squares algorithms are developed for estimating the parameters of DF detectors along with successive, parallel, and iterative DF structures. A novel successive parallel arbitrated DF scheme is presented and combined with iterative techniques for use with cascaded DF stages in order to mitigate the deleterious effects of error propagation. Simulation results for an uplink scenario assess the algorithms and the blind adaptive DF detectors against linear receivers and evaluate the effects of error propagation of the new cancellation techniques against previously reported approaches. In this paper, we examine blind adaptive and iterative decision-feedback (DF) receivers for direct-sequence code-division multiple-access systems in frequency-selective channels. Code-constrained minimum variance and constant modulus [abstract truncated by publisher]. In this paper, we examine blind adaptive and iterative decision-feedback (DF) receivers for direct-sequence code-division multiple-access systems in frequency-selective channels. Code-constrained minimum variance and constant modulus design criteria for DF receivers based on constrained optimization techniques are investigated for scenarios subject to multipath. Computationally efficient blind adaptive stochastic gradient and recursive least squares algorithms are developed for estimating the parameters of DF detectors along with successive, parallel, and iterative DF structures. A novel successive parallel arbitrated DF scheme is presented and combined with iterative techniques for use with cascaded DF stages in order to mitigate the deleterious effects of error propagation. Simulation results for an uplink scenario assess the algorithms and the blind adaptive DF detectors against linear receivers and evaluate the effects of error propagation of the new cancellation techniques against previously reported approaches |
| Author | Sampaio-Neto, Raimundo de Lamare, Rodrigo C. |
| Author_xml | – sequence: 1 givenname: Rodrigo C. surname: de Lamare fullname: de Lamare, Rodrigo C. email: rcdl500@ohm.york.ac.uk organization: Center for Studies in Telecommun., Pontificia Univ. Catolica do Rio de Janeiro – sequence: 2 givenname: Raimundo surname: Sampaio-Neto fullname: Sampaio-Neto, Raimundo email: raimundo@cetuc.puc-rio.br |
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| Keywords | Fading channels Multiuser detection Parameter estimation Adaptive algorithm Iterative method Stochastic method Recursive algorithm decision feedback receivers Constrained optimization direct-sequence-code-division multiple access (DS- CDMA) systems Minimal variance Frequency selection Simulation Least squares method Code division multiple access Blind adaptive algorithms Growth of error Uplink Direct sequence Signal detection Cascade connection |
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| SubjectTerms | Adaptive algorithms Algorithms Applied sciences Blind adaptive algorithms Blinds Channels Concurrent computing Constraint optimization d irect-sequence-code-division multiple access (DS-CDMA) systems decision feedback receivers Design optimization Detection, estimation, filtering, equalization, prediction Detectors Estimating Exact sciences and technology Frequency Information, signal and communications theory Iterative algorithms Iterative methods Least squares approximation Multiaccess communication multiuser detection Parameter estimation Receivers Signal and communications theory Signal, noise Stochastic processes Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) |
| Title | Blind Adaptive and Iterative Algorithms for Decision-Feedback DS-CDMA Receivers in Frequency-Selective Channels |
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