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Bidirectional secondary transmissions with energy harvesting in cognitive wireless sensor networks

基于能量收割的认识无线传感网络中次用户双向传输方案的研究

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Abstract

To the existing spectrum sharing schemes in wireless-powered cognitive wireless sensor networks, the protocols are limited to either separate the primary and the secondary transmission or allow the secondary user to transmit signals in a time slot when it forwards the primary signal. In order to address this limitation, a novel cooperative spectrum sharing scheme is proposed, where the secondary transmission is multiplexed with both the primary transmission and the relay transmission. Specifically, the process of transmission is on a three-phase time-switching relaying basis. In the first phase, a cognitive sensor node SU1 scavenges energy from the primary transmission. In the second phase, another sensor node SU2 and primary transmitter simultaneously transmit signals to the SU1. In the third phase, the node SU1 can assist the primary transmission to acquire the opportunity of spectrum sharing. Joint decoding and interference cancellation technique is adopted at the receivers to retrieve the desired signals. We further derive the closed-form expressions for the outage probabilities of both the primary and secondary systems. Moreover, we address optimization of energy harvesting duration and power allocation coefficient strategy under performance criteria. An effective algorithm is then presented to solve the optimization problem. Simulation results demonstrate that with the optimized solutions, the sensor nodes with the proposed cooperative spectrum sharing scheme can utilize the spectrum in a more efficient manner without deteriorating the performance of the primary transmission, as compared with the existing one-directional scheme in the literature.

摘要

在目前基于能量收割的认知无线传感网络中频谱共享方案中, 大多数方案限制了次用户系统仅 能在主用户空闲时或者进行协作传输时才能共享频谱。为了解决这一问题, 本文提出了一种新的协作 频谱共享方案。在此方案中, 次用户系统可以在主用户传输信息时和协作认知传输时均能共享频谱。 具体来说, 整个传输过程按时间切换中继方案可以分为三个阶段。在第一阶段, 一个认知的传感节点 SU1 通过接收主用户发送的能量信号进行能量收割; 在第二阶段, 另一个认知的传感节点SU2 和主用 户发送端同时发送信息给SU1; 在第三阶段, 传感节点SU1 可以通过协助主用户信息传输从而获得频 谱共享的机会。在所有的接收端均采用联合的解码和干扰消除技术来获得所需的信息。通过数学分析, 本文得到主用户系统和次用户系统的中断概率的闭式解。进一步来说, 本文还分析了基于能量收割时 间和功率分配比例的优化问题, 同时相应地提出了一种有效的算法获取优化值。仿真结果表明, 将提 出的优化算法和频谱共享方案结合, 系统的频谱效率较传统的方案有了极大的提高, 同时主用户系统 的传输速率也有了较大的提升。

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Authors and Affiliations

  1. School of Information Science and Engineering, Central South University, Changsha, 410083, China

    Kun Tang  (唐锟), Rong-hua Shi  (施荣华) & Wen-tai Lei  (雷文太)

  2. China Electronics Standardization Institute, Beijing, 100007, China

    Ming-ying Zhang  (张明英)

  3. School of Software, Tsinghua University, Beijing, 100084, China

    He-yuan Shi  (施鹤远)

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  1. Kun Tang  (唐锟)
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  3. Ming-ying Zhang  (张明英)
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  4. He-yuan Shi  (施鹤远)
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Correspondence to Wen-tai Lei  (雷文太).

Additional information

Foundation item: Project(61201086) supported by the National Natural Science Foundation of China; Project(201506375060) supported by the China Scholarship Council; Project(2013B090500007) supported by Guangdong Provincial Science and Technology Project, China; Project(2014509102205) supported by the Dongguan Municipal Project on the Integration of Industry, Education and Research, China; Project(2017GK5019) supported by 2017 Hunan-Tech & Innovation Investment Project, China

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Tang, K., Shi, Rh., Zhang, My. et al. Bidirectional secondary transmissions with energy harvesting in cognitive wireless sensor networks. J. Cent. South Univ. 25, 2626–2640 (2018). https://doi.org/10.1007/s11771-018-3941-2

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  • DOI: https://doi.org/10.1007/s11771-018-3941-2

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