Abstract
In this letter, we investigate covert relay communications with finite block-length against combining detection, in which two-hop signals received by the warden can be combined to determine the presence of private transmission. First, closed-form expressions of the tractable bound of covertness constraint, the average packet error probability, and the average effective covert throughput (AECT) are derived. Then, the optimization problems of maximizing the AECT by jointly optimizing the power of transmitter and relay are tackled. Furthermore, comparing with the non-combining detection strategy, our examinations reveal that the maximum AECT under the combining detection strategy is significantly deteriorated in the considered system.
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