阵列天线在超宽带通信系统中的应用研究

本文介绍了时跳-脉冲位置调制(TH-PPM)超宽带信号形式的信号结构,并分析了高斯脉冲波形及其自相关函数的时域特性.给出了一个阵列天线模型,定义并仿真计算了阵列天线的峰值幅度方向图,结果表明,阵元数目越多,阵列波束宽度越窄;同时,提出了二分搜索波束形成算法并进行了仿真,仿真结果表明,该波束形成算法收敛速度快,收敛步数在1~15步之间,能实时调整阵列的主波束方向对准来波的方位,得到信号的最佳接收.

Study on the Application of Antenna Array in Ultrawide-Band Communication Systems

This paper describes the configuration of a typical time-hopping,pulse positio n modulated(TH-PPM) signal for ultrawide-band(UWB) systems and the time-domain properties of the Gaussian pulse and its autocorrelation function are derived.A n antenna array model for UWB communication systems is introduced and the peak- amplitude pattern is defined and simulated.Simulative results indicate that the beam width grows narrower when the array number gets large.It also provides a ra p id bi-searching beamforming algorithm.Simulations show that the convergent step s of the algorithm are between one and fifteen.The algorithm could electronically steer the beam axis to the direction of the source signal and the optimum signa l reception is achieved.