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本文讨论了智能天线系统中多用户下行信号的传输问题。利用场的非相干叠加，我们研究了多用户条件下天线阵的等效激励模型；理论分析及仿真结果表明，该等效阵可以有效地在同一信道中同时给多个用户发送信号。基于该模型，本文还讨论了用基带处理单元完成移相与加权操作的可行性与有效性，并针对ＭＳＫ调制方式提出了智能天线系统下行部分的实现方案。
This article discusses the transmission of multi-user downlink signals in smart antenna systems. Using the non-coherent superposition of fields, we study the equivalent excitation model of antenna array under multi-user conditions. Theoretical analysis and simulation results show that the equivalent array can effectively send signals to multiple users simultaneously on the same channel. Based on this model, the paper also discusses the feasibility and effectiveness of using the baseband processing unit to perform the phase-shifting and weighting operations. The implementation scheme of the downlink part of the smart antenna system is proposed for the MSK modulation mode.