Visible to the public Frozen Bit Selection Scheme for Polar Coding Combined with Physical Layer Security

TitleFrozen Bit Selection Scheme for Polar Coding Combined with Physical Layer Security
Publication TypeConference Paper
Year of Publication2019
AuthorsCao, Huan, Johnston, Martin, le Goff, Stéphane
Conference Name2019 UK/ China Emerging Technologies (UCET)
KeywordsARQ protocol, Automatic repeat request, BER, bit-error rate, channel coding, composability, Decoding, density evolution, eavesdropper, error statistics, frozen bit, frozen bit selection scheme, impulsive noise, legitimate users, Metrics, physical layer security, polar codes, polar coding scheme, Protocols, pubcrawl, Receivers, resilience, Resiliency, secrecy rate, security, symmetric α-stable distribution, telecommunication security, wiretap channel

In this paper, we propose a frozen bit selection scheme for polar coding scheme combined with physical layer security that enhances the security of two legitimate users on a wiretap channel. By flipping certain frozen bits, the bit-error rate (BER) of an eavesdropper is maximized while the BER of the legitimate receiver is unaffected. An ARQ protocol is proposed that only feeds back a small proportion of the frozen bits to the transmitter, which increases the secrecy rate. The scheme is evaluated on a wiretap channel affected by impulsive noise and we consider cases where the eavesdropper's channel is actually more impulsive than the main channel. Simulation results show that the proposed scheme ensures the eavesdropper's BER is high even when only one frozen bit is flipped and this is achieved even when their channel is more impulsive than the main channel.

Citation Keycao_frozen_2019