In this paper, we study the cellular communications over unlicensed millimeter-wave (mmWave) bands to satisfy the extra-high transmission rate demands. To guarantee the harmonious coexistence of cellular and WiGig users over 60 GHz bands, we design a frame structure for the unlicensed mmWave spectrum sharing to reduce the interference caused by cellular data transmission to WiGig networks. By joint frequency and spatial resource allocation, an iterative channel allocation and hybrid beamforming algorithm is designed to maximize the sum rate of all cellular users while minimizing the interference to WiGig networks. Simulation results show that our proposed scheme outperforms the SVD-based hybrid beamforming method. The fairness between the cellular and the WiGig users is achieved by setting an optimal transmit power of the gNB for unlicensed mmWave spectrum sharing. The influence of the beamwidth and beam direction of the gNB is evaluated in terms of the system performances of both the unlicensed cellular users and WiGig users.

中文翻译：

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采用混合波束成形的非授权毫米波段蜂窝通信


在本文中，我们研究了免许可毫米波（mmWave）频段上的蜂窝通信，以满足超高传输速率的需求。为了保证60 GHz频段上蜂窝和WiGig用户的和谐共存，我们设计了免许可毫米波频谱共享的框架结构，以减少蜂窝数据传输对WiGig网络造成的干扰。通过联合频率和空间资源分配，设计了迭代信道分配和混合波束成形算法，以最大化所有蜂窝用户的总速率，同时最小化对 WiGig 网络的干扰。仿真结果表明，我们提出的方案优于基于 SVD 的混合波束形成方法。通过为免许可毫米波频谱共享设置 gNB 的最佳发射功率，可以实现蜂窝用户和 WiGig 用户之间的公平性。 gNB 波束宽度和波束方向的影响根据未授权蜂窝用户和 WiGig 用户的系统性能进行评估。