tailieunhanh - Báo cáo hóa học: " An orthogonal spectrum sharing scheme for wireless sensor networks"

An orthogonal spectrum sharing scheme for wireless sensor networks | Bohara et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 10 EURASIP Journal on . http content 2011 1 10 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access An orthogonal spectrum sharing scheme for wireless sensor networks Vivek A Bohara 1 See Ho Ting1 Yang Han1 and Ashish Pandharipande2 Abstract It is not economically viable to allocate a dedicated spectrum band to wireless sensor networks WSNs . Moreover sharing a spectrum band with incumbent primary system compromises the reliability and performance of both the systems due to interference from one system to another. In this article we address this limitation by proposing a two-phase orthogonal spectrum sharing protocol for a WSN which exploits multiple sensor nodes to effectively cancel out the interference from a WSN to the primary system and vice versa. As a consequence it is possible to achieve spectrum access for the WSN without compromising on the performance of either systems. Performance of WSN as well as the primary system is quantified in terms of average received signal to noise ratio. We then validate the efficiency of the proposed scheme through analytical and simulation results. Introduction Recently wireless sensor networks WSNs 1-5 are being increasingly deployed all over the world at an accelerated pace. This has been made practically feasible by significant advances in microelectro-mechanical systems MEMS technology radio communications and digital electronics 2 . A typical WSN consists of spatially distributed sensor nodes deployed in an ad hoc manner which collects data and pass on to a central base station CBS via a radio link. The CBS can be a PC data server dedicated monitoring device or any other gateway to a higher data rate device. WSNs are used for various applications including military surveillance habitat monitoring object tracking traffic monitoring etc. Most of the sensor nodes are autonomous and send