分布式卫星码域协作传输技术

摘要：分布式卫星协作传输技术通过有效利用邻域跨轨的卫星集群资源，以实现高效的数据传输和信息共享。针对功率域多星协作传输技术面临的多星干扰信号处理复杂性高、传输可靠性差等问题，介绍了多星码域协作传输方案，包括满足多个卫星在时、频、功率、码域上并行传输的码本设计，以及基于大规模MIMO的并行信号联合译码算法。仿真验证了相比功率域传输方案，码域传输方案能够在低信噪比条件下，支撑更大规模的卫星集群进行更可靠的多星并行传输。最后，讨论并总结了分布式卫星码域智能协作传输技术的若干开放问题与未来研究方向。

关键词：分布式卫星网络；多星协作；码域传输；智能协作

Abstract: Cohesive clustered satellites' cooperative transmission technology leverages the resources of satellite clusters across different orbits to achieve efficient data transmission and information sharing. Addressing the issues of high complexity in multi-satellite interference signal processing and poor transmission reliability in power-domain multi-satellite cooperative transmission, this paper introduces a code-domain multi-satellite cooperative transmission scheme. This includes a codebook design that supports parallel transmission across multiple satellites in the time, frequency, power, and code domains, as well as a parallel signal joint decoding algorithm based on large-scale MIMO. Simulations demonstrate that compared to the power-domain transmission scheme, the code-domain cooperative scheme can support larger-scale satellite clusters in achieving reliable multi-satellite parallel transmission under low signal-to-noise ratio conditions. Finally, this paper discusses and summarizes several open issues and future research directions for distributed satellite code-domain intelligent cooperative transmission technology.

Keywords: cohesive clustered satellites; multi-satellite cooperation; code-domain transmission; intelligent cooperation