移动通信网络中的协作通信

为了提高移动通信系统的性能,通常需要在发射端进行分集。而移动通信中的发射分集一般需要在发射端使用多根天线,但许多无线设备因受尺寸或硬件复杂度的限制,一般只有单根天线。为此,专家提出了一种新的解决方法——协作通信。该方法使用带有一根天线的移动台,在多用户环境中可以共享其他移动用户的天线,这样可产生多根虚拟发射天线,进而得到相应的分集增益,改善移动通信系统的性能。

In order to improve the performance of mobile communication system, diversity should generally be provided at the transmit side. Transmit diversity generally requires more than one antenna at the transmitter. However, many wireless devices are limited by size or hardware complexity to one antenna. In order to overcome this disadvantage, a new class of methods called cooperative communication has been proposed that enables single-antenna mobiles in a multi-user environment to share their antennas and generate a virtual multiple-antenna transmitter that allows them to achieve transmit diversity. So the performance of mobile communication system can also be improved by this scheme.