Robust blind multiuser detection for synchronous CDMA systems using worst-case performance optimization
The performance of blind multiuser detection methods is known to degrade severely in the presence of even small mismatches between the actual and the presumed desired user signatures. Such mismatches may occur in practical situations due to an imperfect knowledge of the channel impulse response. We...
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| Veröffentlicht in: | IEEE transactions on wireless communications Jg. 3; H. 6; S. 2232 - 2245 |
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| Sprache: | Englisch |
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Piscataway, NJ
IEEE
01.11.2004
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1536-1276, 1558-2248 |
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| Abstract | The performance of blind multiuser detection methods is known to degrade severely in the presence of even small mismatches between the actual and the presumed desired user signatures. Such mismatches may occur in practical situations due to an imperfect knowledge of the channel impulse response. We propose a new robust approach to blind multiuser detection in the presence of unknown arbitrary-type mismatches of the desired user signature. Two different formulations of a robust multiuser receiver are considered. The proposed formulations are based on the explicit modeling of uncertainties in the covariance matrix of the desired user signature and/or data covariance matrix and optimization of the worst-case performance. Simple closed-form solutions to the considered robust multiuser detection problems are derived. The proposed methods have a computational complexity comparable to that of the traditional blind multiuser detection algorithms, and, at the same time, offer an improved robustness and faster convergence rates. |
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| AbstractList | The performance of blind multiuser detection methods is known to degrade severely in the presence of even small mismatches between the actual and the presumed desired user signatures. Such mismatches may occur in practical situations due to an imperfect knowledge of the channel impulse response. We propose a new robust approach to blind multiuser detection in the presence of unknown arbitrary-type mismatches of the desired user signature. Two different formulations of a robust multiuser receiver are considered. The proposed formulations are based on the explicit modeling of uncertainties in the covariance matrix of the desired user signature and/or data covariance matrix and optimization of the worst-case performance. Simple closed-form solutions to the considered robust multiuser detection problems are derived. The proposed methods have a computational complexity comparable to that of the traditional blind multiuser detection algorithms, and, at the same time, offer an improved robustness and faster convergence rates. |
| Author | Gershman, A.B. Shahbazpanahi, S. |
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| Keywords | Multiuser detection Simulation Synchronous transmission Wireless telecommunication Code division multiple access Receiver Performance analysis Blind identification Optimization |
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| SubjectTerms | Algorithms Applied sciences Blind linear receivers Blinds Channels Code division multiplexing Computational complexity Covariance matrix Degradation Detection, estimation, filtering, equalization, prediction Detectors Exact sciences and technology Impulse response Information, signal and communications theory Mathematical models Multiaccess communication Multiple access interference Multiuser detection Optimization Robustness Signal and communications theory Signal, noise Signatures synchronous code-division multiple-access (CDMA) Telecommunications and information theory |
| Title | Robust blind multiuser detection for synchronous CDMA systems using worst-case performance optimization |
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