考虑互耦和激励误差时智能天线波束形成

在考虑阵元间耦合和激励误差的情况下,讨论DS/CDMA(Direct Sequence/Code Division Multiple Access)系统中,智能天线的波束形成结果,并与理想情况进行比较.通过仿真数据结果可以看出,对于阵元间距为半波长的线阵,即使存在阵元间耦合和激励误差,智能天线产生的主瓣也可以对准目标,但其对其它多址信号的抗干扰能力有所下降,其中互耦的影响较大,表明要充分保持DS/CDMA系统的抗干扰能力需要计及互耦效应.

Performance of smart antenna when coupling and excitation error are considered

The performance of smart antenna in DS/CDMA(direct sequence/code division multiple access) systems is investigated when there are mutual coupling and/or excitation error which is compared with that in ideal situations. As an example, it is shown from the simulation that for adaptive arrays with half-wavelength spaced elements even there exist mutual coupling and/or excitation error, the radiation pattern's main beam can still point to the arrival direction of the desired signal. However, the interference cancellation ability decreases in some degrees and the effect of mutual coupling between array elements on the beamforming performance of adaptive arrays is more serious. So the mutual coupling should be taken into account in order to improve the performance.