A Robust and Low-Complexity Walsh-Hadamard Modulation for Doubly-Dispersive Channels

In this letter, we present a generic modulation framework for robust wireless communications over doubly dispersive channels. This robustness is achieved by spreading the symbols over time and frequency such that they experience the same channel gain. Interestingly, we show that our modulation frame...

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Bibliographic Details
Published in:IEEE communications letters 2021-03, Vol.25 (3), p.897-901
Main Authors: Bomfin, Roberto, Nimr, Ahmad, Chafii, Marwa, Fettweis, Gerhard
Format: Article
Language:English
Subjects:
Channels
Complexity
Computer Science
doubly dispersive channel
Fourier transforms
MMSE-PIC
Modulation
Multiplication
Networking and Internet Architecture
OFDM
OTFS
Precoding
Robustness
Sparse matrices
Time-frequency analysis
Walsh-Hadamard
Waveforms
Wireless communication
Wireless communications
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Summary:In this letter, we present a generic modulation framework for robust wireless communications over doubly dispersive channels. This robustness is achieved by spreading the symbols over time and frequency such that they experience the same channel gain. Interestingly, we show that our modulation framework is a generalization of the recently proposed orthogonal time frequency space modulation (OTFS). By exploiting an additional degree of freedom enabled by the generic framework, we propose in this letter a low-complex waveform based on the sparse Walsh-Hadamard transform (WHT). We show that the proposed sparse WHT modulation exhibits the same frame error rate performance as OTFS, while significantly reducing the implementation complexity due to the multiplication-free small-size WHT compared with the discrete Fourier transform used by symplectic finite Fourier transform (SFFT) of OTFS.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2020.3034429