论文标题
分布式发射光束形成：分析最大通信范围
Distributed Transmit Beamforming: Analyzing the Maximum Communication Range
论文作者
论文摘要
分布式发射光束形成是一种调节合作无线电的信号以在目的地无线电上相干组合的技术。为了实现连贯的组合，收音机可以与频率同步和信号相调整的目的地交换前序。在目的地，连贯的组合会导致波束形成（BF）增益。 BF增益可以通过反对与目的地距离增加的路径损失来扩展通信范围。理想情况下，最大范围可以从BF增益中微不足道计算出来，但实际上，BF增益取决于距离，因为在较大距离的情况下，交换前置序的较低SNR会导致较高的同步和相位估计误差，从而使BF增益降低。在本文中，考虑到目标为主导的BF协议的BF增益降解，我们通过分析BF SNR和BF增益之间的关系来计算最大通信范围，以实现所需的BF后SNR。我们表明，增加序言长度或增加目标功率可以显着增加最大范围，同时增加无线电数量会减少范围扩展。
Distributed transmit beamforming is a technique that adjusts the signals from cooperating radios to combine coherently at a destination radio. To achieve coherent combining, the radios can exchange preambles with the destination for frequency synchronization and signal phase adjustment. At the destination, coherent combining leads to a beamforming (BF) gain. The BF gain can extend the communication range by countering the path loss that increases with the distance from the destination. While ideally the maximum range can be trivially calculated from the BF gain, in reality, the BF gain depends on the distance because, at a larger distance, lower SNR of the exchanged preambles causes higher synchronization and phase estimation errors, which in turn degrades the BF gain. In this paper, considering the BF gain degradation for a destination-led BF protocol, we calculate the maximum communication range to realize a desired post-BF SNR by analyzing the relation between the pre-BF SNR and the BF gain. We show that increasing the preamble lengths or increasing the destination power can significantly increase the maximum range while just increasing the number of radios gives diminishing range extension.
