A High-Performance Wideband Receiver for Cognitive Radio

用于认知无线电的高性能宽带接收器

• 批准号: 1310279
• 负责人: Won Namgoong
• 金额: $ 33万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310279&HistoricalAwards=false
• 关键词: Performance; Wideband; Receiver; Cognitive; Radio

Intellectual Merit:Cognitive radio enables efficient use of the scarce radio spectrum by sensing available bands and communicating in an opportunistic manner. Although significant work has been reported in the literature that enables dynamic use of these under-utilized spectrum resources, the underlying assumption in cognitive radio is the availability of a flexible and efficient wideband receiver. Designing such a receiver, however, is challenging. The specific problems are the inter-modulation and harmonic distortion caused by the wide passband of the receiver, the need for a wide tuning range frequency synthesizer to span the frequency band of interest, and the use of power-hungry high-speed ADCs to reduce sensing time. In the proposed research, the harmonic mixing process in wideband receivers is viewed as a multi-user access system in communications. This perspective allows leveraging on existing work on multi-user detection theory to develop techniques to overcome many of the implementation challenges. To fully realize the benefits of the proposed approach, several research tasks will be pursued, including developing a scalable receiver architecture, exploring analog combining methods of multi-phase/multi-frequency clocks to maximize performance after digital equalization, and devising a robust and high-performance digital equalizer that exploits the structure of the mixing process. Furthermore, this research will demonstrate the feasibility and the advantages of the proposed approach to wideband receiver design by realizing it on silicon. A complete design framework will be developed based on a clear understanding of various design options and the corresponding tradeoffs in performance and implementation complexity.Broader Impact:The proposed research should help realize a high-performance cognitive radio, which has emerged as a promising approach to efficiently exploit the scarce radio electromagnetic spectrum. In addition, the concepts developed in this research are broadly applicable to many existing and emerging wideband systems such as in multi-standard/multi-band radios and software defined radios. The principles can also be applied to non-communication applications in radar systems and sensor networks. The above research plan is coupled with an education plan that describes how the proposed research will help train both graduate and undergraduate students. The multi-disciplinary nature of the proposed research will broaden the students technical understanding, which the PI believes is essential for next generation of engineers. The proposal also includes plans to improve the participation of undergraduate students and members of under-represented groups.

智能优势：认知无线电通过感知可用频段并以机会主义方式进行通信，从而有效利用稀缺的无线电频谱。虽然在文献中已经报道了能够动态使用这些未充分利用的频谱资源的重要工作，但认知无线电中的基本假设是灵活且高效的宽带接收器的可用性。然而，设计这样的接收器是具有挑战性的。具体问题是接收器的宽通带引起的互调和谐波失真，需要宽调谐范围的频率合成器来跨越感兴趣的频带，以及使用功耗高的高速ADC来减少感测时间。在所提出的研究中，宽带接收机中的谐波混频过程被视为通信中的多用户接入系统。这种观点允许利用现有的多用户检测理论的工作，开发技术，以克服许多实现的挑战。为了充分实现所提出的方法的好处，将追求几个研究任务，包括开发一个可扩展的接收机架构，探索多相位/多频率时钟的模拟组合方法，以最大限度地提高数字均衡后的性能，并设计一个强大的和高性能的数字均衡器，利用混合过程的结构。此外，本研究将通过在硅上实现宽带接收机设计来证明所提出的方法的可行性和优点。一个完整的设计框架将开发基于清晰的理解各种设计方案和相应的权衡性能和实施的复杂性。更广泛的影响：拟议的研究应有助于实现高性能的认知无线电，这已成为一个有前途的方法，有效地利用稀缺的无线电电磁频谱。此外，在这项研究中开发的概念是广泛适用于许多现有的和新兴的宽带系统，如在多标准/多频段无线电和软件定义的无线电。这些原理也可以应用于雷达系统和传感器网络中的非通信应用。上述研究计划与一项教育计划相结合，该计划描述了拟议的研究将如何帮助培养研究生和本科生。拟议研究的多学科性质将拓宽学生的技术理解，PI认为这对下一代工程师至关重要。该提案还包括改善本科生和代表性不足群体成员参与的计划。