DFRC with Improved Communication-Sensing Trade-off via Private Subcarrier Permutations and Pairing with Antennas
DFRC with Improved Communication-Sensing Trade-off via Private Subcarrier Permutations and Pairing with Antennas
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DOI：
10.1109/wcnc51071.2022.9771743
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Zhaoyi Xu;A. Petropulu
中科院分区：
文献类型：
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作者：
Zhaoyi Xu;A. Petropulu
双功能雷达通信（DFRC）系统在频谱利用率、系统复杂度和能量利用率等方面都有显著的提高，是下一代无线通信系统设计的热点。本文考虑DFRC系统使用MIMO雷达与稀疏的发射阵列，发送OFDM波形，并分配共享和私人子载波的有源发射天线。子载波共享允许天线将数据符号调制到相同的子载波上并实现高通信速率，而使用专用子载波通过实现具有比物理接收阵列更大孔径的虚拟阵列的公式化来权衡用于感测性能的通信速率。我们建议利用可用子载波之间的私有子载波的排列和有源天线和私有子载波之间的配对来恢复一些通信速率损失。利用私有子载波的1-稀疏性，我们还提出了一个低复杂度的算法来识别私有子载波和检测天线-子载波配对。
Dual function radar communication (DFRC) systems can achieve significant improvements in spectrum efficiency, system complexity and energy efficiency, and are attracting a lot of attention for next generation wireless system design. This paper considers DFRC systems using MIMO radar with a sparse transmit array, transmitting OFDM waveforms, and assigning shared and private subcarriers to active transmit antennas. Sub-carrier sharing allows antennas to modulate data symbols onto the same subcarriers and enables high communication rate, while the use of private subcarriers trades-off communication rate for sensing performance by enabling the formulation of a virtual array with larger aperture than the physical receive array. We propose to exploit the permutation of private subcarriers among the available subcarriers and the pairing between active antennas and private subcarriers to recover some of the communication rate loss. Exploiting the 1-sparse property of private subcarriers, we also propose a low complexity algorithm to identify private subcarriers and detect the antenna-subcarrier pairing.