Abstract:

Considering that the relay may eavesdrop the forwarded confidential information, the secure performance analysis on an untrusted relay network is investigated based on Time Switching Relaying（TSR） protocol over Nakagami-[m] channel. The network consists of a source and a destination, both equipped with multi-antenna, and an energy-constraint relay equipped with a single antenna. To examine the secure transmission of the networks, two transmission schemes are specially considered, i.e., Transmit Antenna Selection/maximal Ratio Combining（TAS/MRC） scheme, and Maximal Ratio Transmission/maximal Ratio Combining（MRT/MRC） scheme. To investigate the security and reliability performance of the untrusted relay networks, the closed-form expressions of the Secrecy Outage Probability（SOP）, the Connection Outage Probability（COP） and the Effective Secrecy Throughput（EST） for each scheme are successively derived. In addition, the asymptotic performance of EST is further analyzed in the high Signal-to-Noise Ratio（SNR） regime. The theoretical analysis is validated with the Monte Carlo simulation, and the simulations reveal the effect of the SNR, the transmit power allocation factor, the time switching coefficient, the antenna numbers on the performance of EST.

Key words: performance analysis, Nakagami-[m] channel, Time Switching Relaying（TSR）, untrusted relay

摘要：

针对中继可能窃听转发的私密信号，研究了Nakagami-[m]信道中时间切换中继协议的非可信中继网络安全传输性能，该网络中源节点与目的节点均配置了多根天线，而能量受限的非可信中继仅有一根天线。为分析网络的安全传输，考虑了两种安全传输方案，即发送天线选择/最大比合并方案和最大比传输/最大比合并方案。为研究非可信中继网络的安全性和可靠性，依次推导出两种方案安全中断概率、连接中断概率、安全吞吐量的闭式表达式，并分析了高信噪比下安全吞吐量的渐进性能。利用蒙特卡洛仿真验证了理论分析的正确性，仿真结果揭示了信噪比、发送功率分配因子、时间切换系数、天线数对安全吞吐量的影响。

关键词: 性能分析, Nakagami-[m]信道, 时间切换中继（TSR）, 非可信中继