无线通信系统可以利用的资源包括：空间、时间、频率和功率。在B3G/4G系统中，空间资源和频率资源被重新开发使用，从而大大提高了系统的性能。

多天线技术在发送端和接收端同时使用多根天线，扩展了空间域，充分利用了空间扩展所提供的特征，从而带来了系统容量的提高。目前多天线技术已成为了B3G/4G系统的关键技术之一。

-The resources that the wireless communication system can use include: space, time, frequency and power. In the B3G/4G system, the spatial resources and the frequency resource are re- used, which greatly improve the system performance..

Characteristics of multi antenna technology in sending end and simultaneous use of multiple antennas at the receiver, to expand the spatial domain, make full use of the space extensions are provided, which brought the system capacity to improve. At present, multi antenna technology has become one of the key technologies of B3G/4G system..