Recently, many studies propose the use of ultra-wideband technology for passive and active radio frequency identification systems as well as for wireless sensor networks due to its numerous advantages. By harvesting t...Recently, many studies propose the use of ultra-wideband technology for passive and active radio frequency identification systems as well as for wireless sensor networks due to its numerous advantages. By harvesting these advantages of IR-UWB technology at the physical-layer design, this paper proposes that a cross layer architecture platform can be considered as a good integrator for different wireless short-ranges indoor protocols into a universal smart wireless-tagged architecture with new promising applications in cognitive radio for future applications. Adaptive transmission algorithms have been studied to show the trade-off between different specific QoS requirements, transmission rates and distances at the physical layer level and this type of dynamic optimization and reconfiguration leads to the cross-layer design proposal in the paper. Studies from both theoretical simulation and statistical indoor environments experiments are considered as a proof of concept for the proposed architecture.展开更多
在认知超宽带(cognitive ultra-wideband,CUWB)通信系统中,检测与躲避(detection and avoidance,DAA)策略通过感知首要用户(primary user,PU)所处频段,然后用脉冲波形设计等方法来规避所占频段以获得共存通信的效果。提出了一种新的DAA-...在认知超宽带(cognitive ultra-wideband,CUWB)通信系统中,检测与躲避(detection and avoidance,DAA)策略通过感知首要用户(primary user,PU)所处频段,然后用脉冲波形设计等方法来规避所占频段以获得共存通信的效果。提出了一种新的DAA-CUWB共存通信方案,首先设计多尺度的宽带频谱检测算法来感知PU所用频段,粗细尺度结合的检测方式保证频谱的准确检测和较低的复杂度,进而提出基于多通道正交频域编码的脉冲成形设计算法,来避开被PU占据的频段,最大化CUWB的频谱利用率。利用理论分析和仿真测试验证了所提出的DAA算法的特性,并通过性能仿真进一步论证了共存方案的有效性,实验结果表明CUWB和PU都能保证各自系统性能,并最大化地共享了频率资源。展开更多
基金Acknowledgments： This work was supported by the National Science Foundation of China （No. 60872002）, the Universities Natural Science Research Project of Jiangsu Province （No. 07KJB510091） and the Application Research Project of Nantong City （No. K2007014）.
文摘Recently, many studies propose the use of ultra-wideband technology for passive and active radio frequency identification systems as well as for wireless sensor networks due to its numerous advantages. By harvesting these advantages of IR-UWB technology at the physical-layer design, this paper proposes that a cross layer architecture platform can be considered as a good integrator for different wireless short-ranges indoor protocols into a universal smart wireless-tagged architecture with new promising applications in cognitive radio for future applications. Adaptive transmission algorithms have been studied to show the trade-off between different specific QoS requirements, transmission rates and distances at the physical layer level and this type of dynamic optimization and reconfiguration leads to the cross-layer design proposal in the paper. Studies from both theoretical simulation and statistical indoor environments experiments are considered as a proof of concept for the proposed architecture.
文摘在认知超宽带(cognitive ultra-wideband,CUWB)通信系统中,检测与躲避(detection and avoidance,DAA)策略通过感知首要用户(primary user,PU)所处频段,然后用脉冲波形设计等方法来规避所占频段以获得共存通信的效果。提出了一种新的DAA-CUWB共存通信方案,首先设计多尺度的宽带频谱检测算法来感知PU所用频段,粗细尺度结合的检测方式保证频谱的准确检测和较低的复杂度,进而提出基于多通道正交频域编码的脉冲成形设计算法,来避开被PU占据的频段,最大化CUWB的频谱利用率。利用理论分析和仿真测试验证了所提出的DAA算法的特性,并通过性能仿真进一步论证了共存方案的有效性,实验结果表明CUWB和PU都能保证各自系统性能,并最大化地共享了频率资源。
