Robust Beamforming Design for SWIPT-Based Multi-Radio Wireless Mesh Network with Cooperative Jamming

Liang Li,Xiongwen Zhao,Suiyan Geng,Lei Zhang,Yu Zhang

doi:10.3390/info11030138

Abstract

Wireless mesh networks (WMNs) can provide flexible wireless connections in a smart city, internet of things (IoT), and device-to-device (D2D) communications. The performance of WMNs can be greatly enhanced by adopting a multi-radio technique, which enables a node to communicate with more nodes simultaneously. However, multi-radio WMNs face two main challenges, namely, energy consumption and physical layer secrecy. In this paper, both simultaneous wireless information and power transfer (SWIPT) and cooperative jamming technologies were adopted to overcome these two problems. We designed the SWIPT and cooperative jamming scheme, minimizing the total transmission power by properly selecting beamforming vectors of the WMN nodes and jammer to satisfy the individual signal-to-interference-plus-noise ratio (SINR) and energy harvesting (EH) constrains. Especially, we considered the channel estimate error caused by the imperfect channel state information. The SINR of eavesdropper (Eve) was suppressed to protect the secrecy of WMN nodes. Due to the fractional form, the problem was proved to be non-convex. We developed a tractable algorithm by transforming it into a convex one, utilizing semi-definite programming (SDP) relaxation and S-procedure methods. The simulation results validated the effectiveness of the proposed algorithm compared with the non-robust design.

Highlights

Wireless mesh networks (WMNs) are able to wirelessly cover a large area with low deployment and maintenance costs
When combining with multi-radio (MR) technology, the capacity of WMNs is significantly improved [1,2,3]. Due to such a feature, WMNs are suitable for both providing ubiquitous connection to the internet and carrying data generated by multiple services, such as internet of things (IoT), smart grids, vehicle-to-vehicle (V2V), etc. [4,5,6], where mesh nodes need to be deployed without fixed power connections
We numerically investigated the performance of the robust beamforming design for simultaneous wireless information and power transfer (SWIPT)-based multi-radio WMN with cooperative jamming

Summary

Introduction

Wireless mesh networks (WMNs) are able to wirelessly cover a large area with low deployment and maintenance costs. When combining with multi-radio (MR) technology, the capacity of WMNs is significantly improved [1,2,3] Due to such a feature, WMNs are suitable for both providing ubiquitous connection to the internet and carrying data generated by multiple services, such as internet of things (IoT), smart grids, vehicle-to-vehicle (V2V), etc. [4,5,6], where mesh nodes need to be deployed without fixed power connections. Energy harvesting (EH) WMNs yield low battery maintenance costs and less energy storage requirements at each node by harvesting the energy from the environment (e.g., solar or wind power) [7,8,9,10]. The intermittent and unpredictable nature of these energy sources makes it difficult to supply a certain amount of power for applications continuously and stably with EH technology, and most conventional EH technologies are only applicable in specific environments

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Results

Conclusion