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A Novel Double Modulation Technique with High Spectrum Efficiency for TDCS

  • Bo ZhengEmail author
  • Heng-Yang Zhang
  • Le Sun
  • Hua-Xin Wu
  • Wei-Lun Liu
Conference paper
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 262)

Abstract

The modulation techniques in traditional transform domain communication system (TDCS) exist some drawbacks, such as low transmission rate and low spectrum efficiency. We propose a novel double modulation technique with high spectrum efficiency for TDCS in this paper. First, we divide the basis function averagely into several orthogonal modules, and conduct the CSK modulation. Then, the double modulation signal waveform can be obtained by employing bipolar modulation for different module combination. Furthermore, we propose two demodulation schemes for the proposed modulation technique, namely the cyclic shift keying (CSK)-bipolar and bipolar-CSK demodulation. We also derive the mathematical expressions of their bit error rate (BER) performance. Simulation results show that for different signal-to-noise ratio (SNR), the two demodulation schemes can both achieve reliable performance, satisfactory anti-interference capabilities and effectively improve spectrum efficiency. In addition, it can be verified that CSK-bipolar demodulation can achieve the same BER with less SNR compared with bipolar-CSK demodulation.

Keywords

TDCS CSK Bipolar modulation Demodulation Spectrum efficiency 

Notes

Acknowledgement

This work was supported in part by the Aeronautical Science Foundation of China under Grant 20161996010.

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Copyright information

© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2019

Authors and Affiliations

  • Bo Zheng
    • 1
    • 2
    Email author
  • Heng-Yang Zhang
    • 1
  • Le Sun
    • 3
  • Hua-Xin Wu
    • 4
  • Wei-Lun Liu
    • 1
  1. 1.Information and Navigation InstituteAir Force Engineering UniversityXi’anChina
  2. 2.College of Electronics and InformationNorthwestern Polytechnical UniversityXi’anChina
  3. 3.PLA Unit of 94719Ji’anChina
  4. 4.Radar NCO SchoolAir Force Early Warning AcademyWuhanChina

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