Energy Efficient Dual-Functional Radar-Communication: Rate-Splitting Multiple Access, Low-Resolution DACs, and RF Chain Selection
Energy Efficient Dual-Functional Radar-Communication: Rate-Splitting Multiple Access, Low-Resolution DACs, and RF Chain Selection
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DOI：
10.1109/ojcoms.2022.3183950
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发表时间：
2022-02
影响因子：
7.9
通讯作者：
Onur Dizdar;Aryan Kaushik;B. Clerckx;C. Masouros
中科院分区：
文献类型：
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作者：
Onur Dizdar;Aryan Kaushik;B. Clerckx;C. Masouros
双功能雷达通信系统通过在同一硬件平台上联合实现这些功能并使用公共RF资源，增强了通信和雷达感测的优势。在设计这种系统时要解决的一个重要和最新的问题是最大限度地提高能源效率。在本文中，我们考虑了一个双功能雷达通信系统，同时进行多用户通信和雷达传感，并调查相对于有源传输元件的能量效率行为。具体来说，我们制定了一个问题，以找到最佳的预编码器和最大的能源效率的活动RF链的数量，考虑到低分辨率的数模转换器的功耗下，每个RF链通信和雷达性能的限制。我们考虑速率分裂多址来执行多用户通信的完美和不完美的信道状态信息在发送端。所制定的非凸优化问题的解决，通过一种新的算法。我们通过数值结果表明，速率分裂多址接入实现了提高的能源效率，采用更少的RF链相比，空分多址接入，由于其广义的结构和改进的干扰管理能力。
Dual-Functional Radar-Communication systems enhance the benefits of communications and radar sensing by jointly implementing these on the same hardware platform and using the common RF resources. An important and latest concern to be addressed in designing such systems is maximizing the energy-efficiency. In this paper, we consider a Dual-Functional Radar-Communication system performing simultaneous multi-user communications and radar sensing, and investigate the energy-efficiency behaviour with respect to active transmission elements. Specifically, we formulate a problem to find the optimal precoders and the number of active RF chains for maximum energy-efficiency by taking into consideration the power consumption of low-resolution Digital-to-Analog Converters on each RF chain under communications and radar performance constraints. We consider Rate-Splitting Multiple Access to perform multi-user communications with perfect and imperfect Channel State Information at Transmitter. The formulated non-convex optimization problem is solved by means of a novel algorithm. We demonstrate by numerical results that Rate Splitting Multiple Access achieves an improved energy-efficiency by employing a smaller number of RF chains compared to Space Division Multiple Access, owing to its generalized structure and improved interference management capabilities.