Physical Layer Security Capacity In Wireless Cooperation Communication System

Wireless communication plays a more and more significant role in people's life.At the same time,communication security attracts much more attention.Physical layer security theory utilizes the characteristics of random wireless channels to achieve a keyless security communication.Moreover,cooperative communication can effectively improve not only the reliability by solving the signal fading problem caused by multipath fading,but also the security.Compressed sensing(CS)is a technology that breaks the limitation of traditional sampling.In this paper we apply CS to cooperative communication.Using secrecy capacity to evaluate the security of dual-hop and multi-hop cooperative communication model with the eavesdropping existence.For the dual-hop model with CCS-AF and CCS-DF schemes,we analyze the possibility that transmission channel matrix can be regarded as the measurement matrix in CS.After deriving the secrecy capacity,we analyzing the secrecy capacity impacts made by different parameters.Simulation results show that multi-node cooperative CCS-AF and CCS-DF schemes combined with CS have better performance than traditional single-source multi-relay dual-hop schemes.For the multi-hop model,we first propose M-CCS-AF and M-CCS-DF schemes in which relays without independent information,then we propose MCS-DF scheme in which relay with the independent information.For all schemes we analyze the feasibility that the channel matrix from all nodes to the destination regarded as the measurement matrix in CS.Moreover,for M-CCS-AF and M-CCS-DF schemes,we discuss the possibility of signal transmitting time slots regarding as the measurement dimension.For MCS-DF strategy,we claim the possibility of the number of destination nodes regarding as the measurement dimension.Then we derive the security capacity for different schemes.Simulation results show that M-CCS-AF and M-CCS-DF schemes we proposed have better security capacity than the traditional multi-hop schemes without CS.MCS-DF scheme have better security capacity than the traditional scheme with non-relay independent information.