Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : 3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses | Kim and Kim Nanoscale Research Letters 2011 6 544 http content 6 1 544 o Nanoscale Research Letters a SpringerOpen Journal NANO IDEA Open Access 3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses Nammoon Kim and Youngok Kim Abstract In these days the development of positioning technology for realizing ubiquitous environments has become one of the most important issues. The Global Positioning System GPS is a well-known positioning scheme but it is not suitable for positioning in in-door building environments because it is difficult to maintain line-of-sight condition between satellites and a GPS receiver. To such problem various positioning methods such as RFID WLAN ZigBee and Bluetooth have been developed for indoor positioning scheme. However the majority of positioning schemes are focused on the two-dimension positioning even though three-dimension 3D positioning information is more useful especially in indoor applications such as smart space U-health service context aware service etc. In this paper a 3D positioning system based on mutually orthogonal nano-scale impulse radio ultra-wideband IR-UWB signals and cross array antenna is proposed. The proposed scheme uses nano-scale IR-UWB signals providing fine time resolution and high-resolution multiple signal specification algorithm for the time-of-arrival and the angle-of-arrival estimation. The performance is evaluated over various IEEE channel models and simulation results show the effectiveness of proposed scheme. Keywords 3D positioning nano-scale pulse UWB orthogonality impulse radio Introduction The extraction of interesting features or positioning information from target objectives has become increasingly popular and required for realizing intelligent environment services such as smart space U-health service context aware service etc 1-3 . It is well known that the outdoor positioning system has shown a lot of progress with Global Positioning System GPS .
