J Shanghai Jiaotong Univ Sci

Journal of Shanghai Jiaotong University(Science) >

2020 , Vol. 25 >Issue 6: 795 - 801

DOI: https://doi.org/10.1007/s12204-020-2191-2

Fractional Fourier Transform Based M-ary Chirp Modulation

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  • (1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of
    Specialty Fiber Optics and Advanced Communication, Shanghai Institute of Advanced Communication and Data Science,
    Shanghai University, Shanghai 200072, China; 2. School of Electronic and Information, Shanghai Dianji University,
    Shanghai 201306, China)

Online published: 2020-11-26

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Abstract

In this paper, a novel M-ary chirp modulation scheme is proposed on the basis of the energy concentration property of chirp signals in fractional domain. In the proposed scheme, chirp signals with different phases are multiplexed in the same time-frequency bandwidth through reverse chirp-rate to increase information rate. In addition, fractional filters based on fractional Fourier transform (FRFT) are designed to separate chirp signals of different chirp-rates in the receiver. Moreover, the theoretical performance of fractional filters and the error probability of M-ary chirp system are derived. Both theoretical analysis and simulation prove that the proposed scheme outperforms M-ary quadrature amplitude modulation (QAM) system in the anti-noise performance.

Key words： chirp modulation; fractional Fourier transform (FRFT) filter; M-ary chirp

Cite this article

SHA Jiajun, ZHENG Guoxin, YANG Liu . Fractional Fourier Transform Based M-ary Chirp Modulation[J]. Journal of Shanghai Jiaotong University(Science), 2020 , 25(6) : 795 -801 . DOI: 10.1007/s12204-020-2191-2

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