Physical Layer Security of Spatially Modulated Sparse-Code Multiple Access in Aeronautical $Ad$-$hoc$ Networking

For improving the throughput while simultaneously enhancing security in aeronautical ad-hoc networking (AANET), a channel quality indicator (CQI)-mapped spatially modulated sparse code multiple access (SM-SCMA) scheme is proposed this paper. On one hand, we exploit joint benefits of spatial modulation and SCMA for boosting data rate. other physical-layer secret key generated by varying SM-SCMA mapping patterns based on instantaneous CQI desired link. This guarantees AANETs, since not exchanged between source aeroplane its destination. Due to line-of-sight (LoS) propagation AANET, aeroplanes or eavesdroppers may detect signals delivered However, they are unable translate detected into original confidential information, even if copies recoined over hops because have no knowledge CQI-based pattern. The performance CQI-mapped evaluated terms both bit error rate ergodic secrecy rate, which substantiates that secures information exchange multi-hop AANET.