Towards channel state information based coding to enhance security in satellite communication

Abstract

Abstract For satellite communication with bi-directional channels, we investigate the application of Low-Density Parity-Check (LDPC) coding by incorporating channel state information (CSI) to enhance its security performance. Specifically, the scheme includes two main steps: CSI measurement and the design of LDPC security coding. Based on its reciprocity and uniqueness, CSI is first obtained by estimating bidirectional channels followed with quantization and reconciliation, which results in the binary sequence of the CSI. In this work, based on the characteristics of satellite communication, the extended irregular repeat-accumulate (eIRA) of LDPC codes were adapted in order to reduce the storage capacity and computational complexity. Finally, LPDC secure coding scheme utilizes a scrambling matrix that is converted from the CSI’s binary sequence to complete the LDPC coding process. Based on NI USRP 2920, a simulation platform was developed to study the performance of the proposed scheme. The evaluation results show that our proposed scheme can improve the reliability of received information for the legitimate receivers, while leading to increased bit error rates for the eavesdroppers, and thus enhance the communication security.