Physical layer secrecy for wireless communication systems using adaptive HARQ with error contamination

A. Amirzadeh, M. H. Taieb, J. Chouinard
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引用次数: 1

Abstract

This paper proposes a physical layer coding scheme to provide reliability and security in wireless communication systems. An Adaptive Granular Hybrid Automatic Repeat re- Quest (AG-HARQ) scheme based on Low-Density-Parity-Check (LDPC) codes is proposed. In the AG-HARQ protocol, the whole codewords are first transmitted (by Alice) to the intended receiver (Bob) and potentially intercepted by an unauthorized receiver or eavesdropper (Eve). Whenever the legitimate receiver (Bob) fails to decode the correct message, the received codewords are splitted into sub-packets and Bob computes a decoding confidence index for each of these sub-packets. Bob can then request a retransmission of those sub-packets having the lowest confidence indexes. These sub-packets are requested by Bob until correct decoding or until a maximum number of retransmissions is reached. An error contamination (EC) mechanism is also proposed which spreads the errors in the current frame with a scrambler and to the other frames by use of block interleavers. The proposed scheme ensures reliable and secure communication even in the case of negative Security Gap (SG) where the eavesdropper's channel benefits from better channel conditions than the legitimate channel.
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带误差污染的自适应HARQ无线通信系统物理层保密
为了保证无线通信系统的可靠性和安全性,本文提出了一种物理层编码方案。提出了一种基于低密度奇偶校验码(LDPC)的自适应颗粒混合自动重复请求(AG-HARQ)方案。在AG-HARQ协议中,整个码字首先(由Alice)传输到预期的接收者(Bob),并可能被未经授权的接收者或窃听者(Eve)截获。当合法的接收方(Bob)无法解码正确的消息时,接收到的码字将被分割成子包,Bob为每个子包计算解码置信指数。然后,Bob可以请求重传那些具有最低置信度指数的子数据包。这些子包由Bob请求,直到正确解码或达到最大重传次数为止。提出了一种错误污染(EC)机制,利用扰频器将当前帧中的错误传播到其他帧,并利用块交织器将错误传播到其他帧。该方案在存在负安全缺口(SG)的情况下,窃听者的信道比合法信道受益于更好的信道条件,保证了通信的可靠性和安全性。
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