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在实数域讨论了智能天线系统中的多用户数字波束形成方法．智能天线可以通过阵列天线技术在同一信道中利用多个波束同时给多个用户发送不同的信号，以提高通信容量．推导了多用户天线阵等效激励模型的实数形式，并从空间信道均衡的角度在实数域解释了多用户波束形成原理，进一步提出了多用户数字波束形成方法．仿真结果表明，上述方法能够有效地解决智能天线系统中下行选择性发送的问题，并有硬件结构简单、兼容性好、利于软件无线电实现等优点．
The real number domain is discussed in the smart antenna system multi-user digital beamforming method. Smart antennas can use multiple antennas to send different signals to multiple users simultaneously in the same channel through array antenna technology to improve the communication capacity. The real number form of the equivalent excitation model of multiuser antenna array is deduced, and the multi-user beamforming principle is explained in the real number domain from the viewpoint of spatial channel equalization. The multi-user digital beamforming method is further proposed. The simulation results show that the above method can effectively solve the downlink selective transmission problem in the smart antenna system, and has the advantages of simple hardware structure, good compatibility and software radio implementation.