Secrecy Energy Efficiency for MIMO Single- and Multi-Cell Downlink Transmission With Confidential Messages
Secrecy Energy Efficiency for MIMO Single- and Multi-Cell Downlink Transmission With Confidential Messages
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DOI：
10.1109/tifs.2019.2891231
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发表时间：
2019-01
影响因子：
6.8
通讯作者：
Alessio Zappone;Pin-Hsun Lin;Eduard Axel Jorswieck
中科院分区：
文献类型：
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作者：
Alessio Zappone;Pin-Hsun Lin;Eduard Axel Jorswieck
本文提出了一种基于保密性约束的MIMO多用户系统能量效率优化的波束形成框架。考虑了两种信道模型，即具有机密消息的广播信道（对应于单小区下行链路）和具有机密消息的干扰信道（对应于多小区下行链路），其中发送多个消息，并且必须确保只有预期接收器能够执行数据解码，从而将非预期接收器视为潜在的窃听者。在这种多用户场景中，新的度量全局保密能量效率的引入和优化。此外，通过提供一种计算系统保密能量效率Pareto边界的有效方法，分析了不同用户保密能量效率之间的耦合。这两个贡献是通过开发一个优化框架，它适当地结合了分式规划理论和序列优化理论。该框架是可证明收敛的，享有负担得起的复杂性，并满足一阶最优性。最后，提供了支持下行链路传输的智能用户选择算法的闭合形式条件。
This work develops a beamforming framework for energy efficiency optimization in MIMO multi-user systems with confidentiality constraints. Two channel models are considered, namely, a broadcast channel with confidential messages (corresponding to single-cell downlink) and an interference channel with confidential messages (corresponding to multi-cell downlink), in which multiple messages are transmitted, and it must be ensured that only the intended receiver is able to perform data decoding, thus treating non-intended receivers as potential eavesdroppers. In this multi-user scenario, the new metric global secrecy energy efficiency is introduced and optimized. Moreover, the coupling among the secrecy energy efficiencies of different users is analyzed by providing an efficient way of computing the system secrecy energy efficiency Pareto boundary. Both contributions are achieved by developing an optimization framework which suitably combines fractional programming theory and sequential optimization theory. The proposed framework is provably convergent, enjoys affordable complexity, and fulfills first-order optimality properties. Finally, the closed form conditions are provided to support smart user selection algorithms for downlink transmission.