arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1806.02005cs.ITmath.IT
收藏

Swift-Link:实用mmWave无线电压缩波束对准算法

Swift-Link: A compressive beam alignment algorithm for practical mmWave radios

Nitin Jonathan Myers, Amine Mezghani, Robert W. Heath

摘要:

下一代无线网络将利用毫米波(mmWave)频率下的大量可用频谱。然而,毫米波系统的设计是具有挑战性的,由于严格的功率,成本和硬件约束在较高的带宽。为了实现良好的通信SNR,毫米波系统使用大型天线阵列。使用高定向波束的波束成形是使用天线的一种方式。随着信道随时间变化,必须快速估计使SNR最大化的波束以减少训练开销。先前的工作已经利用了毫米波信道稀疏的观察结果,以利用很少的信道测量来执行基于压缩感知(CS)的波束对准。然而,大多数现有的基于CS的算法,假设完美的同步和失败的载波频率偏移(CFO)的存在下。本文提出了Swift-Link,一种快速的波束对准算法,对偏移是鲁棒的。Swift-Link包括一种新颖的随机化波束训练序列,该序列可最大限度地减少由于CFO引起的波束对准误差,以及一种纠正这些误差的低复杂度算法。即使有严格的硬件限制,我们的算法使用更少的信道测量比可比CS算法,并具有分析保证。与波束扫描技术相比,Swift-Link要求模数转换器的输出动态范围较小。

英文摘要:

Next generation wireless networks will exploit the large amount of spectrum available at millimeter wave (mmWave) frequencies. Design of mmWave systems, however, is challenging due to strict power, cost and hardware constraints at higher bandwidths. To achieve a good SNR for communication, mmWave systems use large antenna arrays. Beamforming with highly directional beams is one way to use the antennas. As the channel changes over time, the beams that maximize the SNR have to be estimated quickly to reduce the training overhead. Prior work has exploited the observation that mmWave channels are sparse to perform compressed sensing (CS) based beam alignment with few channel measurements. Most of the existing CS-based algorithms, however, assume perfect synchronization and fail in the presence of carrier frequency offset (CFO). This paper presents Swift-Link, a fast beam alignment algorithm that is robust against the offset. Swift-Link includes a novel randomized beam training sequence that minimizes the beam alignment errors due to CFO and a low-complexity algorithm that corrects these errors. Even with strict hardware constraints, our algorithm uses fewer channel measurements than comparable CS algorithms and has analytical guarantees. Swift-Link requires a small output dynamic range at the analog-to-digital converter compared to beam-scanning techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑