Two-stage memetic algorithm for blind equalization in direct-sequence/code-division multiple-access Systems
| Autor: | San-José-Revuelta, Luis M., Casaseca-de-la-Higuera, Pablo |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | IET Communications, Vol. 14, Issue 17, pp. 3039-3046, October 2020. ISSN: 1751-8628 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1049/iet-com.2019.0692 |
| Popis: | This paper proposes a novel memetic algorithm (MA) for the blind equalization of digital multiuser channels with Direct-Sequence / Code-Division Multiple-Access (DS/CDMA) sharing scheme. Equalization involves two different tasks, the estimation of: (1) channel response and (2) transmitted data. The corresponding channel model is first analyzed and then the MA is developed for this specific communication system. Convergence, population diversity and near-far resistance have been analyzed. Numerical experiments include comparative results with traditional multiuser detectors as well as with other nature-inspired approaches. Proposed receiver is proved to allow higher transmission rates over existing channels, while supporting stronger interferences as well as fading and time-variant effects. Required computation requisites are kept moderate in most cases. Proposed MA saves approximately 80% of computation time with respect to a standard genetic algorithm and about 15% with respect to a similar two-stage memetic algorithm, while keeping a statistically significant higher performance. Besides, complexity increases only by a factor of 5, when the number of active users doubles, instead of 32x found for the optimum maximum likelihood algorithm. The proposed method also exhibits high near-far resistance and achieves accurate channel response estimates, becoming an interesting and viable alternative to so far proposed methods. Comment: 19 pages, 6 figures, 2 tables |
| Databáze: | arXiv |
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