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Cost-Sensitive and Load-Balancing Gateway Placement in Wireless Mesh Networks with qos constraints

Journal of Computer Science & Technology 2009年第4期24卷 775-785页

作者：曾锋陈志刚 CCF School of Information Science and Engineering Central South University

In wireless mesh networks （WMNs）, gateway placement is the key to network performance, qos and construction cost. This paper focuses on the optimization of the cost and load balance in the gateway placement strategy, ensuring the qos requirements. Firstly, we define a metric for load balance on the gateways, and address the minimum cost and load balancing gateway placement problem. Secondly, we propose two algorithms for gateway placement. One is a heuristic algorithm, which is sensitive to the cost, selects the gateway candidates according to the capacity/cost ratio of the nodes, and optimizes the load balance on the gateways through scanning and shifting methods. The other is a genetic algorithm, which can find the global optimal solution. The two algorithms differ in their computing complexity and the quality of the generated solutions, and thus provide a trade-off for WMN design. At last, simulation is done, and experimental results show that the two algorithms outperform the others. Compared with OPEN/CLOSE, the average cost of gateway placement generated by our algorithms is decreased by 8%~32%, and the load variance on the gateways decreased by 77%-86%. For the genetic algorithm, the performance improvement is at the price of the increase of the CPU execution time.

关键词： wireless mesh network gateway placement load balance qos constraint genetic algorithm

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Power Optimization in Cell-Free Massive MIMO with Non-ideal Hardware Transceiver

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Chinese Journal of Electronics 2020年第1期29卷 190-198页

作者： ZHANG Yao CAO Haotong ZHOU Meng LI Long YANG Longxiang Wireless Communications Key Laboratory of Jiangsu Province Nanjing University of Posts and Telecommunications Department of Information Technology Party School of the Communist Party of China Shandong Provincial Committee

A downlink cell-free massive Multipleinput multiple-output(mMIMO) system is explored. To investigate the impact of hardware distortion on downlink cell-free mMIMO, this paper recalls a well-established model of hardware impairment and derives a new closedform downlink per-user Spectral efficiency(SE) expression for distributed conjugate beamforming precoding. Based on this trackable expression, two power control algorithms,namely max-total-SE and mixed Quality-of-service(qos)algorithms, are proposed. Numerical results indicate that the downlink per-user SE is primarily limited by the hardware quality of the receiver, especially when the user corresponds to the receiver. In addition, the proposed max-total-SE algorithm has a fast convergence rate and can significantly improve the total SE compared to the Equal power control(EPC) scheme. What’s more, our mixed qos algorithm also performs well in many respects.

关键词： Cell-free massive MIMO Conjugate beamforming Non-ideal hardware transceiver Spectral efficiency qos constraint

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