水声软频率复用网络的干扰缓解与资源分配
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TN929.3

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国家自然科学基金项目(面上项目,重点项目,重大项目),陕西省重点产业创新链(2019ZDLSF07-06);西安科技大学培育基金(No.201747).


Soft Frequency Reuse for Underwater Acoustic Networks with Interference Mitigation and Resources Allocation
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    摘要:

    为了降低基于频率复用水声网络系统的小区间干扰,以及提高系统吞吐量,本文提出了一种基于时延差的软频率复用(T-SFR)系统,对小区间的干扰抑制和小区内的自适应资源分配两个问题进行优化。在小区间,本文提出的T-SFR利用不同信道之间的时延差进行干扰缓解,并基于水声信道的路径损耗进行频带分配。在小区内,针对水声信道的时变特性带来的反馈信道状态信息(CSI)延迟的影响,建立了一种线性有限状态马尔可夫链(LFSMC)预测器,以获得更准确的CSI用于自适应资源分配。仿真结果表明,与传统的频率复用方案相比,本文提出的T-SFR方案可以保证小区边缘节点对信干噪比(SINR)的要求,有效地缓解小区边缘节点的干扰;在建立LFSMC预测器获取更准确CSI的基础上,时变水声网络的每个小区内以及整个系统都能够获取更优的吞吐量。

    Abstract:

    In order to reduce the inter-cell interference caused by frequency reuse underwater acoustic network system, improve the system spectrum efficiency, this paper proposed a soft frequency reuse (T-SFR) system based on time delay difference and optimized interference suppression for inter-cell and adaptive resource allocation for inner-cell. For inter-cell, the T-SFR used the delay difference between different channels to mitigate interference, and allocated frequency bands based on the path loss of the UWA channel. For inner-cell, a linear finite state Markov chain (LFSMC) predictor was established for the effect of the feedback channel state information (CSI) delay caused by the time-varying characteristics of the UWA channel to obtain more accurate CSI to adaptive resource allocation. The simulation results show that the T-SFR scheme proposed in this paper can guarantee the requirements of the cell edge nodes on the signal to noise ratio (SINR), and effectively alleviate the interference of the cell edge nodes. With the more accurate CSI obtained by LFSMC forecaster, the better throughput can be obtained in the cell and the whole system of time-varying underwater acoustic network.

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王安义,范蕊,张育芝. 水声软频率复用网络的干扰缓解与资源分配[J]. 科学技术与工程, 2021, 21(10): 4110-4116.
Wang Anyi, Fan Rui, Zhang Yuzhi. Soft Frequency Reuse for Underwater Acoustic Networks with Interference Mitigation and Resources Allocation[J]. Science Technology and Engineering,2021,21(10):4110-4116.

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历史
  • 收稿日期:2020-08-19
  • 最后修改日期:2021-01-07
  • 录用日期:2020-10-24
  • 在线发布日期: 2021-04-28
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