An IR-HARQ scheme for covert communications

Abstract

This paper explores the advantages of incremental redundancy hybrid-ARQ schemes for covert communications in which a feedback channel is available. The use of efficient incremental redundancy with sub-codewords of different sizes provides significant gains in terms of covertness while preserving the error rate performance. The convexity of covertness metrics is exploited to design the size and degree profile of each block when a concatenated code based on MDNL codes is employed in the binary symmetric channel.

Distributed secure transmission for covert communication under multi‐user network

“…Researchers also focus on the covert transmission design based on physical techniques, such as jammer [9], error corrected codes [10][11][12][13], hybrid-ARQ scheme [14], and noise-like modulation [15][16][17][18][19].…”