Space-Time Waveform Coding for Joint Radar and Wireless Communications (RadCom) Applications

2020 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2020-05-01 DOI:10.1109/WCNC45663.2020.9120568

J. Mietzner, Avik Santra

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引用次数: 3

Abstract

We propose a novel space-time waveform coding (STWC) scheme for joint radar and wireless communications (RadCom). In particular, we consider a frequency-modulated continuous-wave (FMCW) multiple-input multiple-output (MIMO) radar for near-range to medium-range radar applications. In order to establish the required orthogonal transmit signals, up- and down-chirp FMCW waveforms are combined with Alamouti space-time coding across two transmit antennas. We demonstrate that, from a radar perspective, the cross-ambiguity function is improved significantly by the orthogonal Alamouti code, while the FMCW waveforms ensure robustness in the presence of Doppler shifts. Regarding the communications part, the generic orthogonality of the Alamouti code allows us to embed random information symbols within the radar signal, enabling wireless communications in the 100 kb/s regime. To this end, we propose a suitable communications receiver algorithm for multiple antennas with corresponding maximum-ratio combining, which is able to extract the embedded information symbols while acquiring spatial diversity gains.

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联合雷达和无线通信(RadCom)应用的空时波形编码

提出了一种用于雷达与无线联合通信(RadCom)的空时波形编码(STWC)方案。特别是，我们考虑了用于近距离到中距离雷达应用的调频连续波(FMCW)多输入多输出(MIMO)雷达。为了建立所需的正交发射信号，将上下啁啾FMCW波形与跨两个发射天线的Alamouti空时编码相结合。我们证明，从雷达的角度来看，正交Alamouti码显著改善了交叉模糊函数，而FMCW波形在多普勒频移存在下确保了鲁棒性。在通信部分，Alamouti码的通用正交性允许我们在雷达信号中嵌入随机信息符号，从而实现100 kb/s的无线通信。为此，我们提出了一种适合多天线的通信接收机算法，该算法具有相应的最大比组合，能够在获取空间分集增益的同时提取嵌入的信息符号。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE Wireless Communications and Networking Conference (WCNC)

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