Quadrature spatial modulation (QSM) based millimeter wave (mmWave) communication system design using frequency diverse array (FDA) is proposed in this article. Since spatial modulation techniques (SMT) employ maximum likelihood (ML) based detector at receiver, the computational complexity increases vastly. Moreover, numerous existing SMT methods utilize phased array (PA), where only angle dependent communication is possible. In this article, we propose to use a standard FDA that exploits a small linearly increasing frequency offset across the array for range-angle dependent QSM wireless communications. That is, the in-phase and quadrature components of transmission vector utilize slightly different frequencies to deliver the information. Furthermore, we propose a suboptimal multi-stage (MS) detector in the receiver, which applies a matched filtering (i.e., bandpass filters matched to the corresponding frequency offsets) approach to decode the index bits at first step, whereas, merely, two most probable estimated indices are utilized further to decode associated data bits using a standard ML method. Adhering an improved signal to noise ratio (SNR) due to an FDA based range-angle dependent transmission, simulation and numerical results show the improved performance of the proposed design over existing SM and QSM based schemes, while MS approach reduces the receiver’s computational complexity.

中文翻译：

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用于毫米波无线通信的基于 FDA 的 QSM：分频发射器和降低复杂性的接收器

本文提出了使用分频阵列 (FDA) 的基于正交空间调制 (QSM) 的毫米波 (mmWave) 通信系统设计。由于空间调制技术 (SMT) 在接收器处采用基于最大似然 (ML) 的检测器，因此计算复杂度大大增加。此外，许多现有的 SMT 方法利用相控阵 (PA)，其中只能进行角度相关的通信。在本文中，我们建议使用标准 FDA，该 FDA 利用阵列中小的线性增加频率偏移进行依赖于距离角的 QSM 无线通信。也就是说，传输矢量的同相和正交分量使用稍微不同的频率来传递信息。此外，我们在接收器中提出了一个次优的多级 (MS) 检测器，其应用匹配滤波（即，与相应频率偏移匹配的带通滤波器）方法在第一步解码索引位，而仅使用两个最可能的估计索引进一步使用标准ML方法解码相关数据位。由于基于 FDA 的距离角相关传输，仿真和数值结果显示了所提议设计的性能优于现有的基于 SM 和 QSM 的方案，因此提高了信噪比 (SNR)，而 MS 方法降低了接收器的计算复杂性。