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Turbo Equalization based on a New Kalman Filter for OFDM over Doubly-Selective Channel s

机译:基于新卡尔曼滤波器的双选择信道OFDM的Turbo均衡

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In OFDM systems, multi-path spread and Doppler frequency spread result in the channel fading to be time- and frequency-selective (doubly selective). In such cases, the channel fast variations destroy the orthogonality among sub-carriers,resulting in inter-carrier interference (ICI) which degrades the performance. Aiming at time-varying characteristic of doubly-selective channels, we propose a channel estimation algorithm by a new Kalman filter, and apply it to the oversampled complex exponential basis expansion model (OCE-BEM), changing the variable channel parameters in the period of one OFDM symbol into invariable ones. Meanwhile, we combine this new Kalman filter with the low complexity LMMSE Turbo equalizer based on ICI mitigation, so we needn't many pilot symbols in practice, still can ensure the algorithm performance and reduce the time-delay and complexity of this algorithm.
机译:在OFDM系统中,多径扩展和多普勒频率扩展导致信道衰落是时间和频率选择性的(双重选择)。在这种情况下,信道快速变化会破坏子载波之间的正交性,从而导致载波间干扰(ICI),从而降低性能。针对双选信道的时变特性,提出了一种新的卡尔曼滤波器的信道估计算法,并将其应用于过采样的复指数基础扩展模型(OCE-BEM),在此期间改变了可变信道参数。一个OFDM符号变成不变的符号。同时,我们将这种新的卡尔曼滤波器与基于ICI缓解的低复杂度LMMSE Turbo均衡器相结合,因此在实践中不需要太多导频符号,仍然可以确保算法性能并减少该算法的时延和复杂度。

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