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Low data rate wireless sensor networks are emerging as potential solutions for many valuable applications, ranging from security and industrial control, to wildlife monitoring. This paper addresses some of the major design challenges involved with integrating RF communication functionality in sensor network nodes. Characteristics of the sensor network node design space, including transmitted range,...
This work uses spatial radio channel measurements to evaluate how much IEEE 802.11b wireless local area network (WLAN) capacity could be improved by using spatial division multiple access (SDMA). The radio channel measurements are collected for three different indoor network configurations using a sectorized antenna suitable for use in an actual 802.11b access point. The measurements are then used...
This paper investigates both theoretical and implementation-level aspects of switching-feedback control strategies for the development of harmonic oscillators. We use sliding-mode compensation based on various norms of the system state to achieve amplitude control over a wide-tuning range. A 7.6-MHz I/Q LC oscillator is developed and tested. Measurements show that implementation of the proposed switch-based...
A study of the effects of front-end impairments on the overall performance of a direct conversion wireless receiver using SDMA is presented. A system-level model, simulated with Verilog-AMS and using Verilog behavioral blocks, is used to evaluate the performance of the receiver under non-ideal RF circuit conditions. Design issues inherent to direct conversion receivers, including IIP2, quadrature...
An adaptive multi-user bi-directional SDMA/CDMA scheme for WLAN is proposed. Key features of this work include the evaluation of practical multi-user detector (MUD) architectures for varying channels, spectrally efficient signaling to economize data converter implementation and customized digital back-end hardware proposals for low-power, low-cost IC implementation. Results indicate that a practical...
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