Communications and Networking. 13th EAI International Conference, ChinaCom 2018, Chengdu, China, October 23-25, 2018, Proceedings

Research Article

A Novel Double Modulation Technique with High Spectrum Efficiency for TDCS

  • @INPROCEEDINGS{10.1007/978-3-030-06161-6_7,
        author={Bo Zheng and Heng-Yang Zhang and Le Sun and Hua-Xin Wu and Wei-Lun Liu},
        title={A Novel Double Modulation Technique with High Spectrum Efficiency for TDCS},
        proceedings={Communications and Networking. 13th EAI International Conference, ChinaCom 2018, Chengdu, China, October 23-25, 2018, Proceedings},
        proceedings_a={CHINACOM},
        year={2019},
        month={1},
        keywords={TDCS CSK Bipolar modulation Demodulation Spectrum efficiency},
        doi={10.1007/978-3-030-06161-6_7}
    }
    
  • Bo Zheng
    Heng-Yang Zhang
    Le Sun
    Hua-Xin Wu
    Wei-Lun Liu
    Year: 2019
    A Novel Double Modulation Technique with High Spectrum Efficiency for TDCS
    CHINACOM
    Springer
    DOI: 10.1007/978-3-030-06161-6_7
Bo Zheng,*, Heng-Yang Zhang1, Le Sun2, Hua-Xin Wu3, Wei-Lun Liu1
  • 1: Air Force Engineering University
  • 2: PLA Unit of 94719
  • 3: Air Force Early Warning Academy
*Contact email: zbkgd@163.com

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.