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Improving Channel Tracking Performance of Single and Multi Carrier Communications with an Outer Loop Controller Based on Fuzzy Logic

机译：利用基于模糊逻辑的外环控制器提高单载波和多载波通信的信道跟踪性能

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摘要

In this paper, the channel tracking performances of channel equalizers for Single (SC) and Multi Carrier (MC) systems in frequency selective Rayleigh fading channels are investigated. The performances of both systems for different values of Doppler frequency offset are compared. Since the desired performance cannot be achieved by channel tracking capacity of LMS-DFE in time varying channels for SC systems, a fuzzy logic based LMS (F-LMS) algorithm has been proposed. The proposed F-LMS algorithm causes a small and ignorable increase in computational complexity, however results in a better performance in channel tracking which is very close to the performance of RLS algorithm. Computer simulations using conventional LMS, Normalized LMS, Modified LMS, Variable Step Size LMS-DFE, B-LMS-DFE and conventional RLS-DFE algorithms in SC systems and also using frequency domain channel equalizer in MC (OFDM) systems are performed. The obtained and compared results are given in Section 5.
机译：本文研究了频率选择性瑞利衰落信道中单（SC）和多载波（MC）系统的信道均衡器的信道跟踪性能。比较了两种系统对于不同的多普勒频偏值的性能。由于在SC系统的时变信道中LMS-DFE的信道跟踪能力无法实现所需的性能，因此提出了一种基于模糊逻辑的LMS（F-LMS）算法。所提出的F-LMS算法导致计算复杂度小而可忽略的增加，但是在信道跟踪方面具有更好的性能，这与RLS算法的性能非常接近。在SC系统中使用常规LMS，归一化LMS，修改后的LMS，可变步长LMS-DFE，B-LMS-DFE和常规RLS-DFE算法进行计算机仿真，并在MC（OFDM）系统中使用频域信道均衡器进行计算机仿真。所得结果和比较结果在第5节中给出。

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