Secure Coding Scheme for the SIMO Broadcast Wiretap Channel with Partial Feedback

Broadcast channel (BC) faces critical physical layer security (PLS) challenges due to their inherent openness. Traditional encryption methods are costly and unsuitable for low-latency applications. Recent studies have shown that Schalk-wijk-Kailath (SK) feedback coding scheme naturally satisfies PLS and achieves double-exponential error decay. This paper investigates two-user Single-Input Multiple-Output (SIMO) broad-cast wiretap channel with partial feedback. A SK-type feedback control scheme based on scalarization and channel splitting is proposed for the two-user SIMO broadcast wiretap channel. Finially, numerical results demonstrate that the proposed scheme outperforms existing secret-key-based methods in the literature.