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The Research of Frequency Domain Equalization Technique in SC-FDE System

Author: WangXiangLi
Tutor: SunLiJun
School: Henan University of Technology
Course: Signal and Information Processing
Keywords: The single-carrier frequency domain equalization LMS guidelines Adaptive equalization Decision Feedback Equalization Variable step size
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 105
Quote: 1
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Abstract


While achieving high-speed, large-capacity communication transmission , how to effectively combat the frequency selective fading of the channel caused by the inter-symbol interference , is always a hot research in wireless communications . Traditional single-carrier complex time domain equalizer degree, the FFT / IFFT - based orthogonal frequency division multiplexing (OFDM) technique can be effective against the frequency selective fading , but there is too large PAPR disadvantages . Single carrier frequency domain equalization (SC-FDE) technology uses a similar OFDM signal processing mode , by IFFT module moving the OFDM transmitter side to the receiving side , in the frequency domain equalization , not only effectively overcome the OFDM peak to average ratio (PAPR) too large shortcomings, and at the same time maintaining the complexity basically unchanged , to obtain a similar performance and OFDM , and thus become one of the important component of the physical layer of broadband wireless access systems . At present , the single-carrier frequency domain equalization technology is being more and more attention , and has been included in the IEEE802.16 standard . The paper first analyzes the characteristics of the wireless communication channel , and SUI channel modeling and simulation, and then expounded the basic principle of the SC-FDE system , detailed study of the SC-FDE system classic frequency domain equalization algorithm : Based on the minimum mean square error frequency domain decision feedback equalizer (MMSE-DFE) algorithm and frequency domain LMS adaptive equalization algorithm . On this basis , the proposed two new frequency domain equalization algorithm : frequency domain LMS adaptive decision feedback equalization (LMS-DFE) algorithm and frequency domain variable step size LMS adaptive equalizer (VLMS-DFE) algorithm . LMS-DFE algorithm in the frequency domain using the LMS algorithm to update the frequency domain filter equalizer coefficients , it adaptive to the characteristics of the transmission channel . In the feedback portion of the time domain , using conventional transversal filter , to avoid the delay inherent in the FFT block signal processing , reducing the error diffusion . However , the LMS-DFE algorithm conflicting requirements of step in the convergence rate and steady-state error . To solve this problem , VLMS-DFE algorithm introduced the idea of variable step size , Sigmoid function based on the mean square error improved to replace traditional fixed step size to achieve fast convergence rate and a small steady-state error . MATLAB simulation shows that the optimal VLMS - DFE algorithm balanced performance system the lowest error rate , followed by the LMS-DFE algorithm .

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