中国邮电高校学报(英文) ›› 2020, Vol. 27 ›› Issue (4): 43-53.doi: 10.19682/j.cnki.1005-8885.2020.0036

• Wireless • 上一篇    下一篇

Reduced-state noncoherent MLSD method for CPM in aeronautical telemetry

周游 段瑞枫 蒋伯峰   

  1. 1. 北京航空航天大学
    2. 北京林业大学
    3. 北京信威科技集团股份有限公司
  • 收稿日期:2019-12-10 修回日期:2020-09-16 出版日期:2020-08-31 发布日期:2020-08-31
  • 通讯作者: 周游 E-mail:youzhou2015@163.com
  • 基金资助:
    国家自然科学基金;中央高校基本科研业务费

Reduced-state noncoherent MLSD method for CPM in aeronautical telemetry

Zhou You, Duan Ruifeng, Jiang Bofeng   

  • Received:2019-12-10 Revised:2020-09-16 Online:2020-08-31 Published:2020-08-31
  • Contact: You zhou E-mail:youzhou2015@163.com

摘要:

Due to high spectral efficiency and power efficiency, the continuous phase modulation ( CPM) technique with constant envelop is widely used in range telemetry. How to improve the bit error rate (BER) performance of CPM and keep a reasonable computational complexity is the key of the entire telemetry system and the focus of research and engineering design. In this paper, a reduced-state noncoherent maximum likelihood sequence detection (MLSD) method for CPM is proposed. In the proposed method, the criterion of noncoherent MLSD is derived for CPM when the carrier phase is unknown. A novel Viterbi algorithm (VA) with modified state vector is designed to simplify the implementation of noncoherent MLSD. Both analysis and numerical results show that the proposed method reduces the computational complexity significantly and does not need accurate carrier phase recovery, which overcomes the shortage of traditional MLSD method. Additionally, the proposed method exceeds the traditional MLSD method when carrier phase deviation exists.

关键词:

CPM, low-complexity, noncoherent detection, MLSD, Viterbi algorithm

Abstract: Due to high spectral efficiency and power efficiency, the continuous phase modulation ( CPM) technique with constant envelop is widely used in range telemetry. How to improve the bit error rate (BER) performance of CPM and keep a reasonable computational complexity is the key of the entire telemetry system and the focus of research and engineering design. In this paper, a reduced-state noncoherent maximum likelihood sequence detection (MLSD) method for CPM is proposed. In the proposed method, the criterion of noncoherent MLSD is derived for CPM when the carrier phase is unknown. A novel Viterbi algorithm (VA) with modified state vector is designed to simplify the implementation of noncoherent MLSD. Both analysis and numerical results show that the proposed method reduces the computational complexity significantly and does not need accurate carrier phase recovery, which overcomes the shortage of traditional MLSD method. Additionally, the proposed method exceeds the traditional MLSD method when carrier phase deviation exists.

Key words: CPM, low-complexity, noncoherent detection, MLSD, Viterbi algorithm

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