一种低轨卫星阵列天线多波束覆盖及多业务协作传输方案

A Multi Beam Coverage and Multi Service Cooperative Transmission Scheme for LEO Satellite Array Antenna

随着5G技术的发展与成熟,将5G技术应用于低轨卫星通信中对天地融合一体化接入具有重要的意义。对于低轨卫星阵列天线多波束覆盖,卫星端天线阵列形成的波束覆盖范围较大,服务的用户数较多,采用自适应波束覆盖的复杂度较高,而采用固定波束覆盖有着星下用户的链路余量过大、边缘用户链路余量低的缺点。为此,设计了一种基于部分连接混合预编码的固定多波束覆盖方案,该方案分割卫星天线阵列形成多个子阵列,再由子阵列形成固定波束进行覆盖。随后基于提出的多波束覆盖方案,借鉴速率拆分(Rate Splitting,RS)技术高效利用空间资源,提出一种基于子阵列的广播单播协作传输方案。仿真实验表明,该方案具有更高的频谱效率。

With the development and maturity of 5G technology,the application of 5G technology in LEO satellite communication is of great significance to the integration of space and earth.For the multi beam coverage of LEO satellite array antenna,the beam coverage of satellite antenna array is large and the number of users is large.The complexity of adaptive beam coverage is high,while the fixed beam coverage has the disadvantages of too large link margin for users under satellite and low link margin for edge users.Therefore,a fixed multi beam coverage scheme based on partial connection hybrid precoding is designed.The scheme divides the satellite antenna array to form multiple subarrays,and then the subarrays form fixed beams for coverage.Then,based on the proposed multi beam coverage scheme and using the rate splitting(RS)technology to make efficient use of space resources,a broadcast unicast cooperative transmission scheme based on subarray is proposed.Simulation results show that the scheme has higher spectral efficiency.