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DFT-spread-OFDM Based Chirp Transmission

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Document pages: 5 pages

Abstract: In this study, we propose a framework for chirp-based communications byexploiting discrete Fourier transform-spread orthogonal frequency divisionmultiplexing (DFT-s-OFDM). We show that a well-designed frequency-domainspectral shaping (FDSS) filter for DFT-s-OFDM can convert its single-carriernature to a linear combination of chirps circularly translated in the timedomain. Also, by exploiting the properties of the Fourier series and Besselfunction of the first kind, we analytically obtain the FDSS filter for anarbitrary chirp. We theoretically show that the chirps with low ripples in thefrequency domain result in a lower bit-error ratio (BER) via less noiseenhancement. We also address the noise enhancement by exploiting therepetitions in the frequency. The proposed framework offers a new way toefficiently synthesize chirps that can be used in Internet-of-Things (IoT),dual-function radar and communication (DFRC) or wireless sensing applicationswith existing DFT-s-OFDM transceivers.

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