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Ergodic secrecy sum rate for multiuser MIMO downlink systems using block diagonalization

机译:使用块对角化的多用户MIMO下行链路系统的遍历保密和速率

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To date, the achievable ergodic secrecy sum rate has been studied for multiuser MIMO downlink systems with single-antenna receivers only. In this paper, we study multiuser MIMO downlink systems with multiple-antenna receivers and an external single-antenna eavesdropper to be kept ignorant of the transmitted messages. We adopt the block diagonalization technique at the transmitter to remove inter-user interference, and derive closed-form expressions of the achievable rate for the intended users and the information leakage rate for the eavesdropper. Furthermore, we analyze asymptotic characteristics of the ergodic secrecy sum rate for the system in the high and low SNR regime, and obtain a tight lower bound in the regime of large transmit and receive antennas. Finally, numerical results validate the accuracy of the theoretical analysis.
机译:迄今为止,已经针对仅具有单天线接收器的多用户MIMO下行链路系统研究了可实现的遍历保密总和率。在本文中,我们研究具有多天线接收器和外部单天线窃听器的多用户MIMO下行链路系统,以使其不了解所传输的消息。我们在发射机处采用块对角化技术,以消除用户之间的干扰,并得出目标用户可达到的速率和窃听者的信息泄漏速率的闭式表达式。此外,我们在高和低SNR体制下分析了系统的遍历保密求和率的渐近特性,并在大型发射和接收天线体制下获得了严格的下界。最后,数值结果验证了理论分析的准确性。

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