6G星地融合网络对卫星通信系统提出了高速率低时延低能耗的要求,由于星地链路信道环境复杂多变且容易受到干扰,需要研究干扰场景下的低成本可实现阵列架构及算法.针对这一问题,设计了一种数模混合阵列结构,子阵采用50%稀疏馈电以及最小二乘波束形成算法,超阵采用最小二乘与线性约束最小方差波束形成算法,并理论分析了阵列结构的可行性,证明子阵的零点能够抑制超阵的栅瓣.仿真结果表明,该结构以更低的复杂度实现了大规模阵列的效果,波束方向图指向明确且零陷深度足够,对干扰的抑制明显,获得了接近理想阵列增益的BER性能.
The 6G satellite-ground integrated network poses demands for high data rates,low latency,and low energy consumption in satellite communication systems.Due to the complex and variable channel environment of satellite-ground links and their susceptibility to interference,it is necessary to research cost-effective and feasible array architectures and algorithms under interference scenarios.To address this issue,a hybrid digital and analog array structure is designed.The sub-array uses a 50%sparse feed and a least squares beamforming algorithm,while the super-array employs a combination of least squares and linearly constrained minimum variance beamforming algorithms.The feasibility of the array structure is theoretically analyzed,demonstrating that the nulls of the sub-array can suppress the grating lobes of the super-array.Simulation results indicate that this structure achieves the effect of large-scale arrays with lower complexity.The beam pattern is well-defined with sufficient null depth,providing significant interference suppression and achieving near-ideal array gain in terms of BER performance.