Fractional Fourier domain equalization for single carrier broadband wireless systems  

作　　者：HUANG KeWu TAO Ran WANG Yue 

机构地区：[1]Department of Electronic Engineering, Beijing Institute of Teehnology, Beijing 100081, China [2]Institute of Manned Space System Engineering, China Academy of Space Technology, Beijing 100094, China

出　　处：《Science China(Information Sciences)》2012年第10期2257-2268,共12页中国科学（信息科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China for Distinguished Young Scholars (Grant No. 60625104);the Foundation for Beijing Excellent PhD Thesis (Grant No. 1320037010901)

摘　　要：In this paper, a novel single carrier equalization approach in the fractional Fourier domain （FRFD） is proposed. It can remove all the inter-symbol interference （ISI） and avoid the considerable noise enhancement of the frequency domain-zero forcing （FD-ZF） equalizer. As the fractional Fourier transform makes a chirp spread, the impulse response of the deep fading channel may be flattened in some orders of the FRFD while it would be greatly attenuated in the FD. By searching for an optimal order under certain criterion, we take advantages of the ZF algorithm to mitigate the effects of the ISI completely. This approach can overcome the contradiction between the ISI mitigation and the noise enhancement of the FD-ZF equalizer. Theoretical analysis and simulation results show that the proposed FRFD^ZF equalizer can achieve a significant performance and have the same computation cost O（N log N） as the conventional FD linear equalizer, especially in the frequency- selective deep-fading channels.In this paper, a novel single carrier equalization approach in the fractional Fourier domain （FRFD） is proposed. It can remove all the inter-symbol interference （ISI） and avoid the considerable noise enhancement of the frequency domain-zero forcing （FD-ZF） equalizer. As the fractional Fourier transform makes a chirp spread, the impulse response of the deep fading channel may be flattened in some orders of the FRFD while it would be greatly attenuated in the FD. By searching for an optimal order under certain criterion, we take advantages of the ZF algorithm to mitigate the effects of the ISI completely. This approach can overcome the contradiction between the ISI mitigation and the noise enhancement of the FD-ZF equalizer. Theoretical analysis and simulation results show that the proposed FRFD^ZF equalizer can achieve a significant performance and have the same computation cost O（N log N） as the conventional FD linear equalizer, especially in the frequency- selective deep-fading channels.

关 键 词：fractional Fourier transform single carrier systems zero-forcing equalizer frequency domain linear equalizer 

分 类 号：TN911.6[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]