Power Minimization-Based Robust OFDM Radar Waveform Design for Radar and Communication Systems in Coexistence
Power Minimization-Based Robust OFDM Radar Waveform Design for Radar and Communication Systems in Coexistence
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DOI：
10.1109/tsp.2017.2770086
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发表时间：
2018-03-01
影响因子：
5.4
通讯作者：
Salous, Sana
中科院分区：
文献类型：
--
作者：
Shi, Chenguang;Wang, Fei;Salous, Sana
本文研究了基于功率最小化的鲁棒正交频分复用（OFDM）雷达波形设计问题，其中雷达与同一频段的通信系统共存。认识到目标光谱的精确特征在实际中不可能被捕获，假设目标光谱处于由已知上界和下界限定的不确定性集合中。基于该不确定性模型，提出了三种不同的基于功率最小化的鲁棒雷达波形设计准则，通过优化OFDM雷达波形来最小化最坏情况下的雷达发射功率，这些准则受目标表征的互信息要求和通信系统的最小容量阈值的约束。这些标准的不同之处在于考虑从目标上散射的通信信号的方式：1)作为有用的能量，2)作为干扰，或3)在雷达接收器上完全忽略。仿真结果表明，利用雷达接收机上的目标散射通信信号可以有效地降低雷达的发射功率。结果表明，鲁棒波形约束了不确定集中任意目标谱的最坏情况下雷达系统的节能性能。
This paper considers the problem of power minimization-based robust orthogonal frequency division multiplexing (OFDM) radar waveform design, in which the radar coexists with a communication system in the same frequency band. Recognizing that the precise characteristics of target spectra are impossible to capture in practice, it is assumed that the target spectra lie in uncertainty sets bounded by known upper and lower bounds. Based on this uncertainty model, three different power minimization-based robust radar waveform design criteria are proposed to minimize the worst-case radar transmitted power by optimizing the OFDM radar waveform, which are constrained by a specified mutual information requirement for target characterization and a minimum capacity threshold for communication system. These criteria differ in the way the communication signals scattered off the target are considered: 1) as useful energy, 2) as interference, or 3) ignored altogether at the radar receiver. Numerical simulations demonstrate that the radar transmitted power can be efficiently reduced by exploiting the communication signals scattered off the target at the radar receiver. It is also shown that the robust waveforms bound the worst-case power-saving performance of radar system for any target spectra in the uncertainty sets.