IHCS: Collaborative Research: Compressive Spectrum Sensing in Cognitive Radio Networks

本研究的目的是改进革命性无线通信范式中协作发现未使用频谱的设计，即认知无线电网络，其中认知无线电用户可以检测和共享未使用频谱。提出的方法是应用协同压缩感知来提高频谱感知带宽、速度和精度。具体来说，认知无线电不是按顺序扫描一组信道，而是感知多个信道功率的线性组合，并将其报告给融合中心，在融合中心使用压缩感知算法恢复被占用的信道。由于所有报告的矩阵都是低秩的，因此可以通过矩阵补全精确地恢复丢失和错误的报告。不需要信道增益的先验知识。该系统的计算量更多，但感知量更少，速度更快，这将通过数值和基于usrp2的模拟来验证。所提出的研究具有潜在的变革性，因为新的框架和算法将广泛应用于涉及多个传感器、模式和数据源的信号传感。这项研究将对一些受众产生更广泛的影响。联合稀疏信号重构的研究将有助于压缩感知和无线网络的研究。硬件的实现将为工业界带来新鲜的想法。拟议的研究将整合到休斯顿大学和莱斯大学现有的联合教育/研究工作中，改善这两所大学中代表性不足的少数民族的教育，并通过美国国家科学基金会赞助的VIGRE项目，让学生接触到无线网络和压缩感知方面的最新研究。

The objective of this research is to improve design of collaboratively discovering unused spectrum in a revolutionary wireless communication paradigm, the cognitive-radio network, in which cognitive-radio users can detect and share the unused spectrum. The proposed approach is to apply collaborative compressive sensing to increase spectrum sensing bandwidth, speed, and accuracy. Specifically, the cognitive radios, rather than sweeping a set of channels sequentially, will sense linear combinations of the powers of multiple channels and report them to the fusion center, where the occupied channels are recovered using compressive sensing algorithms. Missing and erroneous reports can be exactly recovered by matrix completion since the matrix of all reports has a low-rank. Prior knowledge of channel gains is not required. The system computes more but senses much less and faster, which will be validated by both numerical and USRP2-based simulations.The proposed research is potentially transformative as the novel framework and algorithms will broadly apply to signal sensing involving multiple sensors, modalities, and data sources. This research will have a broader impact on several audiences. The study of the jointly-sparse signal reconstruction will contribute to researchers working in compressive sensing and wireless networks. The hardware implementation will bring fresh ideas to the industrial community. The proposed research will be integrated into the existing combined education/research effort at the University of Houston and Rice University, improve education of under-represented minorities at the two institutions, and expose students to state-of-the-art research in wireless networks and compressive sensing through the NSF sponsored VIGRE program.