Systems Engineering and Electronics ›› 2020, Vol. 42 ›› Issue (2): 458-465.doi: 10.3969/j.issn.1001-506X.2020.02.27

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Double scrambling scheme for reducing security gap of channel codes

Weijia LEI(), Yuyu LI()   

  1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2019-05-04 Online:2020-02-01 Published:2020-01-23
  • Supported by:
    国家自然科学基金(61971080);国家自然科学基金(61471076);重庆市基础与前沿探索项目(cstc2018jcyjAX0432);重庆市教委科学技术研究重点项目(KJZD-K201800603);重庆市教委科学技术研究重点项目(KJZD-M201900602)

Abstract:

The security gap is an important secrecy metric of security channel codes. Relevant works focous on the security gap of bit error rate (BER), rather than that of word error rate (WER). A double scrambling scheme is proposed to reduce the security gap of BER and WER simultaneously. Two scramblers are arranged respectively before and after the channel encoder at the transmitter, and two descramblers are arranged respectively before and after the channel decoder at the receiver. Both the BER and WER of the receiver are increased in the lower signal-noise ratio region. Therefore, the security gaps of BER and WER are decreased. The error rate is analyzed, and simulations are performed when BCH code is employed. Theory analysis and simulation results indicate that the proposed scheme is more effective in reducing the security gaps of BER and WER than the single scrambler scheme with the same channel code.

Key words: physical layer security, security gap, scrambling, channel codes

CLC Number: 

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