面向巨型星座网络的多星多波束协作传输方法

Multi-Satellite Multi-Beam Cooperative Transmission Methods for Massive Constellation Networks

以低轨卫星系统为代表的巨型星座网络由于传输距离远、卫星数量大,星地链路受到较大路径损耗和同频干扰影响,通信性能受限。采用协作多点联合传输技术,首先提出一种基于瞬时信道信息的多星联合预编码设计算法,抑制通信链路间干扰并提高通信信号信噪比。以所提算法为基础,进一步利用大维信道的确定性等同原理设计渐近最优的多星联合传输预编码。该方法仅需卫星间交互统计信道信息完成预编码计算,在发掘多星协作传输性能增益的同时,极大降低了星间信令交互流量,利于在巨型星座网络中部署。仿真结果验证了所提算法的有效性。

Massive constellation networks,represented by low Earth orbit satellite systems,face challenges in communication performance due to long transmission distances,a large number of satellites,significant path loss,and co-frequency interference in satelliteto-ground links.To overcome these limitations,this paper proposes a cooperative multi-point joint transmission technique.Firstly,an algorithm based on instantaneous channel information is proposed for multi-satellite joint precoding design,which suppresses inter-link interference and improves the signal-to-noise ratio of the communication signals.Building upon this algorithm,an asymptotically optimal multi-satellite joint transmission precoding design is achieved using the principle of deterministic equivalence in high-dimensional channels.The proposed approach requires only the statistical channel information exchanged between satellites for precoding calculation.It not only explores the performance gain of multi-satellite cooperative transmission but also significantly reduces inter-satellite signaling traffic,facilitating deployment in massive constellation networks.Simulation results validate the effectiveness of the proposed algorithm.