Wideband Silicon-Based Receivers for RF/Microwave Spectrum Sensing

摘要认知无线电系统提供了使用动态频谱管理技术的机会，当主要用户不存在时，可以在大量频谱上适应即时的本地频谱可用性。本研究的目的是为认知无线电开发一种独特的宽带硅基频谱传感接收器。在智能方面，该接收机能够在多倍频程无线电/微波频率范围内进行频谱传感，而不需要任何复杂的可调谐图像抑制滤波器和宽带频率合成器，从而大大降低了功耗和接收机的复杂性。该接收机采用两阶降频转换，前端结构采用窄带频率合成器、整数分频器和可切换谐波混频器。考虑到信号带宽和格式的广泛变化，必须可靠地感知，采用一种可编程能量检测方法来进一步放宽对认知无线电前端的挑战性要求。更广泛的影响就更广泛的影响而言，实现简单、小型化和低功耗的宽带频谱传感接收器是在电池供电环境下运行的认知无线电的基本特征，这些应用包括便携式军用无线电、航空电子设备、电子战、窃听、监视和商业无线移动系统。该项目的成果将推动微波集成电路和无线通信领域的发展。本计划透过各种研究及教育/推广活动，让有才华的学生在微波集成电路及无线通讯方面得到训练。弱势群体的教育机会将通过(1)参加年度电气和计算机工程？(2)与德克萨斯农工大学的“丰富体验工程”项目合作，为少数族裔高中教师提供工程方面的讲习班。

AbstractIntellectual MeritCognitive radio systems offer the opportunity to use dynamic spectrum management techniques to adapt to immediate local spectrum availability over huge swaths of spectrum when the primary users are not present. The objective of this research is to develop a unique wideband silicon-based spectrum sensing receiver for cognitive radios. With respect to intellectual merit, the proposed receiver enables spectrum sensing over multi-octave radio/microwave frequency range without the need for any complex tunable image-reject filter and a broadband frequency synthesizer to drastically reduce the power consumption and the complexity of the receiver. The realization of this receiver is possible by two-step down conversion and employing a narrowband frequency synthesizer, an integer frequency divider and switchable harmonic mixers in the front-end architecture. Given the wide variations in signal bandwidth and formats that must be reliably sensed, a type of programmable energy detection method is employed to further relax challenging requirements for cognitive radio front-ends.Broader ImpactWith respect to broader impact, simple implementation, miniaturization and low power consumption of wideband spectrum sensing receivers are essential features for cognitive radios operating in a battery-powered environment for applications including man-portable military radios, avionics, electronic warfare, eavesdropping, surveillance and commercial wireless mobile systems. The results of the project will advance microwave integrated circuits and wireless communication fields. The proposed project allows talented students to train in microwave integrated circuits and wireless communications through a variety of research, and educational/outreach activities. Educational opportunities for under-represented groups will be explored by (1) attending annual Electrical and Computer Engineering?Unplugged program and Society of Women Engineers summer camp to inspire high school and women students to join the engineering program, and (2) collaborating with Enrichment Experience Engineering program at Texas A&M University to provide workshops for minority high school teachers in engineering.