基于复合权的多用户STC联合波束形成技术

Joint STC and Beamforming Based on Composite Weighting for Muilti-user System

为克服基于特征值分解(EVD)的空时编码(STC)联合波束形成技术在多用户干扰系统中性能的恶化,该文提出了1种卷积复合权结构,将发射波束等效为2个分别具有不同功能的子波束的相乘叠加,实现空时编码在空间分集上的技术优势与波束形成在加强期望信号和干扰抑制特性的最优组合,在获得空时编码空间分集增益与波束形成的阵列增益同时。实现对其它用户干扰的零陷抑制。仿真结果表明,基于复合权的联合空时编码与波束形成方案与传统基于特征值分解的联合方案相比,系统可靠性和系统容量都有显著的提高。

To overcome the disadvantage of joint space time coding （STC） and beamfonning （BF） schemes based on eigen-value decomposing （EVD） in multi-users interference system, this paper proposes a convolutional composite weighting （CCW） structure, which makes equivalent of transmiting beam into multiplication of two sub-beams with different functions. As an optimized combination between technical superiority of space-time coding and beamforming performance, the structure can achieve the full diversity order of STC, beamforming gain of BF. It can restrain the interference signals by nulling. The simulation results indicate that the proposed CCW structure can significantly enhance the reliability performance and the system capacity.