Cascade Interference Alignment Algorithm for Ambient Backscatter Cellular Networks Downlink
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摘要: 环境反向散射蜂窝网络能同时支持蜂窝网通信和环境反向散射通信，具有良好的应用前景，但环境反向散射的信号与蜂窝网络信号之间存在严重的互相干扰。针对这一问题，该文提出环境反向散射蜂窝网络的级联干扰对齐(CIA)算法。为了分别对齐基站信号对阅读器和用户的干扰，设计两层级联的预编码矩阵。充分考虑到反向散射节点计算能力弱，无法自主进行预编码矩阵设计的限制，结合基站到反向散射节点的信道状态信息对反向散射信号进行了预编码。并设计了对应用户的两层级联干扰抑制矩阵和阅读器的3层级联干扰抑制矩阵，将不同来源的干扰分层消除。仿真结果表明，所提算法能够消除环境反向散射蜂窝网络中的复杂干扰，保证蜂窝网络信号和反向散射信号正常传输，提高了系统和速率。Abstract: Ambient backscatter cellular network can support both cellular communication and ambient backscatter communication, which has a broad application prospect, but there is serious interference between ambient backscatter signals and cellular network signals. To solve this problem, a Cascade Interference Alignment (CIA) algorithm for ambient backscatter cellular networks is proposed. In order to align the interference of base station signals to reader and users, a two-tier precoding matrix is designed. Considering the limitation that the computing capacity of the backscatter node is weak and it can not design the precoding matrix independently, the backscatter signal is pre-coded by combining the channel state information from the base station to the backscattering device. A two-tier interference suppressing matrix for users and a three-tier interference suppressing matrix for reader are designed to eliminate the interference from different sources. The simulation results show that the proposed algorithm can eliminate the complex interference in the ambient backscattering cellular network, ensure the normal transmission of the cellular network signal and backscattering signal, and provide the better sum rate performance.
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Key words:
- Cellular networks /
- Backscatter /
- Interference alignment
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