OFDM Pilot-Based Radar for Joint Vehicular Communication and Radar Systems
OFDM Pilot-Based Radar for Joint Vehicular Communication and Radar Systems
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DOI：
10.1109/vnc.2018.8628347
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Ceyhun D. Ozkaptan;E. Ekici;O. Altintas;Chang-Heng Wang
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文献类型：
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作者：
Ceyhun D. Ozkaptan;E. Ekici;O. Altintas;Chang-Heng Wang
随着互联和自动驾驶汽车的大规模部署，车载网络对无线通信频谱的需求迅速增加。由于需求的增加，在5.9 GHz频段为车辆通信分配的频谱不能有效地用于更大的有效载荷，以提高协作感知，安全性和移动性。为了实现更高的数据速率，可以利用76-81 GHz频段的毫米波（mmWave）汽车雷达频谱进行通信。然而，我们没有在通信和雷达之间采用频谱隔离或干扰缓解方案，而是为车辆设计了一个联合系统，使用相同的波形执行这两种功能。在本文中，我们提出了在正交频分复用（OFDM）波形中使用导频的雷达处理方法。虽然雷达接收机利用导频进行感测，但通信接收机可以利用导频来估计时变信道。仿真结果表明，所提出的雷达处理可以有效地实现，并满足汽车雷达的要求。我们还提出了联合系统设计问题，以找到最佳的资源分配之间的数据和导频子载波的雷达估计精度和有效的信道容量的基础上。
With the large-scale deployment of connected and autonomous vehicles, the demand on wireless communication spectrum increases rapidly in vehicular networks. Due to increased demand, the allocated spectrum at the 5.9 GHz band for vehicular communication cannot be used efficiently for larger payloads to improve cooperative sensing, safety, and mobility. To achieve higher data rates, the millimeter-wave (mmWave) automotive radar spectrum at 76–81 GHz band can be exploited for communication. However, instead of employing spectral isolation or interference mitigation schemes between communication and radar, we design a joint system for vehicles to perform both functions using the same waveform. In this paper, we propose radar processing methods that use pilots in the orthogonal frequency-division multiplexing (OFDM) waveform. While the radar receiver exploits pilots for sensing, the communication receiver can leverage pilots to estimate the time-varying channel. The simulation results show that proposed radar processing can be efficiently implemented and meet the automotive radar requirements. We also present joint system design problems to find optimal resource allocation between data and pilot subcarriers based on radar estimation accuracy and effective channel capacity.