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中文摘要：
利用对阵元间距要求相互矛盾的空间复用和波束形成两种技术,提出了组合波束形成的空时码发射方案,有效发挥他们各自的优势.通过对发射天线子阵不同划分的研究表明,将发射天线分成多个子阵,可以从波束形成获得分集增益,从空是复用获得复用增益.性能分析和仿真结果都表明,基于单一子阵划分的发射方式其性能严重依赖于波达方向和角度扩展,而基于多子阵划分的发射方式不受波达方向和角度扩展影响,性能保持稳定.当波达方向为0°,角度扩展为50°时,与单子阵划分相比,基于多子阵划分的系统性能提升近12 dB.若角度扩展变小,则性能改善更明显.
英文摘要：
This paper investigates a novel scheme combining spatial multiplexing with beamforming in spite of the contradietive requirement of antenna element spacing. The proposed scheme combines spatial multiplexing with beamforming of space-time block coding, which has the advantages of both techniques. The diversity gain is achieved by beamforming, and the multiplexing gain by spatial multiplexing according to different antenna array groups. The performance analysis and simulation results of the single antena array are shown to be dependent on the DOA and AS. However, the multiple antenna array is shown to have a stable performance independent of DOA and AS. Simulation results indicate that multiple antenna array can improve performnaee by 12 dB compared with the single antenna arrays when the direction of arrival is 0 angles and the angular spread is 50 angles. The performance will be improved obviously if the angular spread becomes smaller.
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