In this paper, we propose a novel approach, namely, Transform Domain Equalization (TrDE), for high mobility wireless communications in which the channel often experiences serious doubly selective fading. In particular, we design a special framing and modulation scheme with parameters tuned to those of the doubly selective fading channel so as to facilitate the equalization. Data symbols in one block are arranged in a compact matrix form and modulated into the time- frequency domain (TFD). When transmitted over a doubly selective channel, the matrix is expanded along both dimensions as a result of the delay spread and the Doppler spread. By inserting proper Zero Paddings (ZP) into this matrix, the expanded array can be equalized in the transform domain (TrD) with a one-tap equalizer, where the TrD is orthogonal to the original TFD through a two-dimensional fast Fourier Transform (2D FFT). The proposed TrDE effectively mitigates the doubly selectivity with relatively low complexity because only a one-tap equalizer is needed. Further, by averaging over time and frequency, it achieves the maximum joint multipath-Doppler diversity. Both theoretical analysis and simulation results are presented to validate its excellent performances.


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    Title :

    Transform Domain Equalization for Doubly Selective Channels


    Contributors:


    Publication date :

    2019-04-01


    Size :

    257525 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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