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Antenna design using left-handed materials

机译:使用左手材料的天线设计

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摘要

Smart antenna technologies are emerging as an innovative way to meet the growing demand for more powerful, cost-effective and highly efficient wireless communication systems. In this project, from broad category of smart antenna techniques, the switch beam digital-beamforming technique in the downlink is deployed to improve the fidelity and performance of WiMax application. In this regards, the designed system forms and steer the beam according to the user location which is known to the system. In addition, the system performs sidelobe cancellation base on the chebyshev algorithm to optimize the antenna radiation pattern. The design and implementation steps are as follow: the system is firstly modeled by MATLAB software. After modeling, the algorithm is implemented in DSP by using C and Code Composer Studio. After DSP hardware implementation, the signal management is performed in DSP before transmission to the FPGA board. This management is necessary, in order to make processed signal in DSP suitable for channel separation process in FPGA. FPGA is deployed to split the data stream into sixteen channels corresponding to number of antenna elements. Next, the FPGA and DSP are integrated together to form the baseband switch beam smart antenna system. After integration process, the hardware is tested; the results prove that the system functions properly as we expected from simulation model. In this project, lastly, the initial design of IF, RF-front-end and their necessary circuits are also portrayed to be used in the next smart antenna research project.
机译:智能天线技术正在作为一种创新的方式出现,以满足对功能更强大,成本效益更高,效率更高的无线通信系统不断增长的需求。在该项目中,从智能天线技术的广泛类别开始,在下行链路中部署了开关波束数字波束成形技术,以提高WiMax应用的保真度和性能。就这一点而言,所设计的系统根据系统已知的用户位置形成并操纵光束。另外,系统基于切比雪夫算法执行旁瓣消除,以优化天线辐射方向图。设计和实现步骤如下:首先通过MATLAB软件对系统进行建模。建模后,使用C和Code Composer Studio在DSP中实现该算法。在DSP硬件实现之后,信号管理在DSP中执行,然后再传输到FPGA板。为了使DSP中的处理信号适合FPGA中的通道分离过程,该管理是必要的。部署了FPGA以将数据流分成与天线元件数量相对应的16个通道。接下来,将FPGA和DSP集成在一起以形成基带开关波束智能天线系统。集成过程之后,对硬件进行测试;结果证明该系统能够正常运行,正如我们从仿真模型中预期的那样。最后,在该项目中,中频,射频前端及其必要电路的初始设计也被描绘用于下一个智能天线研究项目。

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