TAILIEUCHUNG - Wireless Sensor Networks Part 4

Tham khảo tài liệu 'wireless sensor networks part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 68 Wireless Sensor Networks Each of these signals is incorporated in the design for different reasons. Firstly driving the offline controller with the DC component of the on-line control signal will ensure both controller outputs will be approximately equal or U1 k U2 k . Retaining the high frequency component of the off-line feedback signal enables the off-line controller with the ability to compensate for deep fades in the associated feedback signal. Should handoff then occur a large transient is avoided as the feedback conditions are sufficiently close to each other. Stipulation. if BSl is online Vơníine k yintfk if BS2 is online yontinc k yknj k Base Station 2 Uanigie k Fig. 18. The proposed modified WP-AW scheme 2 Base Station Scenario. Stipulation if BSi is online Uũnlnc kf Umlfk if BS2 if online Uũnlnc kf Um2 k 1 Uml k 1 Ulfty I__J 1 H - - Should base station 2 become on-line equation 21 becomes ymod 2 k - ylin2 k ydiff 2 k - ylin2 k ylin2 kw z - ylin2 kw z - ylin2 k 22 hence the modification will have no effect on the system and the AWBT scheme operates as normal. This approach adds a filtered additional disturbance to the system that is intuitively appealing given that a perturbation of the disturbance feedforward portion of the plant G1 will have no bearing on the stability properties of the system Turner et al. 2007 . 7. An Compliant Testbed for Practical Validation Employing the IEEE compliant Tmote Sky platform Polastre et al. 2007 operating using TinyOS the goal is to construct a testbed for realistic highly repeatable and rigorous experiments. A fully scalable realistic scenario is envisaged where Line-Of-Sight LOS and non-LOS occurrences are frequently observed inducing a Ricean and Rayleigh fading channel respectively. The testbed must therefore include randomly located obstructions. Stationary or embedded deployments are used to analyze the Additive White Gaussian Noise channel and mobility must be introduced to examine multipath

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