We consider a dual-function radar communication (DFRC) system employing frequency hopping (FH) radar waveforms. Each communication symbol is represented by a phase-modulated pulse sequence that multiplies the radar hops in fast-time and transmitted from a multiple-input multiple-output radar platform. In this respect, the DFRC system considered follows the code-shift keying (CSK) signal embedding strategy. The phase modulations include phase-shift keying (PSK), derivative PSK, and continuous phase modulation. The CSK pulse sequences and the FH code are jointly designed to reduce range sidelobe levels (RSLs) and combat range sidelobes modulation. It is shown that the joint optimization using the genetic algorithm yields desired CSK sequences and FH code matrix with less computational complexity compared to the exhaustive search algorithm. The power spectral density and detection performance of various DFRC systems are analyzed, underscoring the tradeoff between RSLs and spectral sidelobe levels. The proposed DFRC system with optimum phase sequences and hopping code achieves high data communication rates by permitting frequencies to be reused in the radar hops.

中文翻译：

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具有 CSK 信令的双功能跳频 MIMO 雷达系统


我们考虑采用跳频（FH）雷达波形的双功能雷达通信（DFRC）系统。每个通信符号由相位调制脉冲序列表示，该序列快速倍增雷达跳数，并从多输入多输出雷达平台传输。在这方面，所考虑的 DFRC 系统遵循码移键控 (CSK) 信号嵌入策略。相位调制包括相移键控(PSK)、导数PSK和连续相位调制。 CSK 脉冲序列和 FH 代码联合设计，旨在降低距离旁瓣电平 (RSL) 并对抗距离旁瓣调制。结果表明，与穷举搜索算法相比，使用遗传算法进行联合优化可以产生所需的 CSK 序列和 FH 码矩阵，计算复杂度更低。分析了各种 DFRC 系统的功率谱密度和检测性能，强调了 RSL 和频谱旁瓣水平之间的权衡。所提出的具有最佳相位序列和跳频码的 DFRC 系统通过允许在雷达跳频中重复使用频率来实现高数据通信速率。