Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2004.06a
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- Pages.265-268
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- 2004
Adaptive Step-size Algorithm for the AIC in the Space-time Coded DS-CDMA System
시공간부호화된 DS-CDMA 시스템에서 적응스텝크기 알고리듬을 적용한 간섭제거수신기
- Yi, Joo-Hyun (School of Electrical Engineering, Seoul National University) ;
- Lee, Jae-Hong (School of Electrical Engineering, Seoul National University)
- Published : 2004.06.01
Abstract
In this paper. we propose an adaptive step-size algorithm for the adaptive interference canceller (AIC) in the space-time trellis coded DS-CDMA system. In the AIC, the performance of the blind LMS algorithms that updates the tap-weight vector of the AIC is heavily dependent on the choice of step-size. To improve the performance of the fixed step-size AIC (FS-AIC), the regular adaptive step-size algorithm is extended in complex domain and applied to the joint AIC and ML decoder scheme. Simulation results show that the joint adaptive step-size AIC (AS-AIC) and ML decoder scheme using the proposed algorithm has boner performance than not only the conventional ML decoder but also the joint FS-AIC and ML decoder scheme without much increase of the decoding delay and complexity.
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