DoA and DoD Estimation and Hybrid Beamforming for Radar-Aided mmWave MIMO Vehicular Communication Systems
DoA and DoD Estimation and Hybrid Beamforming for Radar-Aided mmWave MIMO Vehicular Communication Systems
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雷达辅助毫米波 MIMO 车载通信系统的 DoA 和 DoD 估计以及混合波束成形
DOI：
10.3390/electronics7030040
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发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
Chen Peng
中科院分区：
文献类型：
--
作者：
Chen Zhimin;Cao Zhenxin;He Xinyi;Jin Yi;Li Jingchao;Chen Peng
在毫米波（mmWave）通信中，信号吸收较大、定向传输的特点给无线通信和信号处理带来了新的挑战。为了进一步提高毫米波通信的性能，提出了一种新型雷达辅助毫米波通信（RAMC）方法，可用于车辆通信。所提出的RAMC系统有两个部分，包括雷达子系统和毫米波通信子系统。在雷达子系统中，考虑双基地互质多输入多输出（MIMO）阵列。利用雷达天线阵列，可以估计出发方向 (DoD) 和到达方向 (DoA)。此外，还提出了基于压缩感知（CS）的方法来获取目标位置。使用估计的角度和位置信息，可以消除毫米波通信子系统的信道估计和反馈链路。此外，在毫米波通信子系统中提出了一种混合波束形成算法，可以克服纯模拟波束形成的缺点。仿真结果表明，双基地互质MIMO阵列比传统的均匀线性阵列（ULA）具有更好的估计性能，并且在雷达辅助下，毫米波通信子系统可以减少波束搜索时间，小区发现时间显着提高。
In millimeter wave (mmWave) communications, the feature of relatively large signal absorption and directional transmission render new challenges for wireless communications and signal processing. To further improve the performance of mmWave communications, a novel radar-aided mmWave communication (RAMC) approach is proposed, which can be used in vehicular communications. There are two parts in the proposed RAMC system, including the radar subsystem and the mmWave communication subsystem. In the radar subsystem, the bistatic co-prime multi-input and multi-output (MIMO) arrays are considered. With the radar antenna arrays, both the directions of departure (DoD) and the directions of arrival (DoA) are estimated. Additionally, the compressed sensing (CS)-based method is proposed to obtain the target positions. Using the estimated angle and position information, the channel estimation and feedback link of the mmWave communication subsystem can be eliminated. Moreover, a hybrid beamforming algorithm is proposed in the mmWave communication subsystem, which can overcome the shortage of the analog-only beamforming. Simulation results show that the better estimation performance can be achieved by the bistatic co-prime MIMO arrays than that by the traditional uniform linear arrays (ULA), and with the radar aided, the mmWave communication subsystem can reduce the beam search time, and the cell discovery time is improved significantly.