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.
Transform Domain Equalization for Doubly Selective Channels
2019-04-01
257525 byte
Conference paper
Electronic Resource
English
A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels
British Library Online Contents | 2010
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