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Frame length optimization for multi-antenna downlink systems based on delay-bound violation probability constraints

Journal of Southeast University(English Edition) 2015年第2期31卷 163-169页

作者：谭雨凤李俊超夏玮玮沈连丰东南大学移动通信国家重点实验室南京210096

A flame length optimization scheme is proposed for multi-antenna downlink systems to guarantee diverse delay- bound violation probability constraints. Due to the difficulties of extracting the quality of service （QoS） metrics from the conventional physical-layer channel models, the link-layer models named effective bandwidth and effective capacity are applied to statistically characterize the source traffic patterns and the queuing service dynamics. With these link-layer models, the source traffic process and the channel service process are mapped to certain QoS parameters. The packet delay-bound violation probability constraints are converted into minimum data rate constraints and the optimization problem is thus formulated into simultaneous inequalities. With the assumption of ergodic block-fading channels, the optimal frame lengths of single-user and multiuser systems are calculated respectively by numerical iterative methods. Theoretical analyses and simulation results show that the given delay-bound violation probability constraints are well satisfied with the optimal frame length.

关键词： delay-bound violation probability frame lengthoptimization effective bandwidth effective capacity multi-antenna systems quality of service

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Secure analysis on artificial-noise-aided simultaneous wireless information and power transfer systems

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Frontiers of Information Technology & Electronic Engineering 2020年第11期21卷 1651-1660页

作者： Wei-min HOU Qing-shan TANG School of Information Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China School of Physics Electronic Science Changsha University of Science Sz TechnologyChangsha 410114China

In this paper,we investigate the secrecy outage performance in simultaneous wireless information and power transfer(SWIPT)systems taking artificial noise assistance into *** antennas in the source and a single antenna in both the legitimate receiver and the eavesdropper are ***,the transmitted signal at the source is composed of two parts,where the first part is the information symbols and the other is the noise for the *** avoid making noise in the legitimate receiver,these two parts in the transmitted signals are modulated into two orthogonal dimensions according to the instantaneous channel state between the source and the legitimate *** derive an approximate closed-form expression for the secrecy outage probability(SOP)by adopting the Gauss-Laguerre quadrature(GLQ)method,where the gap between the exact SOP and our approximate SOP converges with increase of the summation terms in the *** obtain the secrecy diversity order and secrecy array gain for the considered SWIPT system,the asymptotic result of the SOP is also *** is tight in the high signal-to-noise ratio region.A novel and robust SOP approximation is also analyzed given a small variance of the signal-to-interference-plus-noise ratio at the *** selected Monte-Carlo numerical results are presented to validate the correctness of the derived closed-form expressions.

关键词： Artificial noise multi-antenna systems Secrecy outage probability Simultaneous wireless information and power transfer

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