减小信道编码安全间隙的两次加扰方案

doi:10.3969/j.issn.1001-506X.2020.02.27

系统工程与电子技术 ›› 2020, Vol. 42 ›› Issue (2): 458-465.doi: 10.3969/j.issn.1001-506X.2020.02.27

减小信道编码安全间隙的两次加扰方案

雷维嘉(), 李玉玉()

重庆邮电大学通信与信息工程学院, 重庆 400065

收稿日期:2019-05-04 出版日期:2020-02-01 发布日期:2020-01-23
作者简介:雷维嘉(1969-),男,教授,博士,主要研究方向为无线通信传输技术。E-mail:leiwj@cqupt.edu.cn|李玉玉(1994-),女,硕士研究生,主要研究方向为物理层安全。E-mail:1661125610@qq.com
基金资助:
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)

Double scrambling scheme for reducing security gap of channel codes

Weijia LEI(), Yuyu LI()

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)

摘要/Abstract

摘要：

安全间隙是衡量安全信道编码保密性能的重要参数,目前相关研究主要考虑误比特率(bit error rate, BER)安全间隙,未考虑误字率(word error rate, WER)安全间隙。为同时减小安全信道编码BER和WER安全间隙,提出一种两次加扰方案。在发送端信道编码器前后各设置一个加扰器,相应在接收端信道译码器前后各设置解扰器,同时增大低信噪比区域的接收BER和WER,减小BER和WER安全间隙。对方案的差错概率进行了理论分析,并对信道编码采用BCH码时系统的性能进行了仿真。理论和仿真结果表明,相较于采用相同信道编码和外扰码器的方案,所提方案在减小WER安全间隙的同时也减小了BER安全间隙。

关键词: 物理层安全, 安全间隙, 加扰, 信道编码

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

中图分类号:

TN918

雷维嘉, 李玉玉. 减小信道编码安全间隙的两次加扰方案[J]. 系统工程与电子技术, 2020, 42(2): 458-465.

Weijia LEI, Yuyu LI. Double scrambling scheme for reducing security gap of channel codes[J]. Systems Engineering and Electronics, 2020, 42(2): 458-465.

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减小信道编码安全间隙的两次加扰方案

Double scrambling scheme for reducing security gap of channel codes

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