Channel estimation for short range wireless sensor network

This paper investigates the channel parameters (time dispersive properties) for the novel idea of tiny communicators called ´specks´. These tiny devices are limited with power so a clear idea of the channel impairment is mandatory for the design of onboard DSP. In order to facilitate the design, measurement of the impulse response characteristic has been investigated through different media and antennas. The paper investigates the measured impulse response and statistical properties of amplitude variations for individual impulses for distances of around 10 cm in addition to power delay profile, path loss, mean excess delay, root mean square delay, coherence bandwidth, and their impact on system design. The narrowband model has been used to predict the path loss of the channel and extent of coverage of the transmitting speck. The wide band channel sounding has been done to investigate the impulse response parameters such as delay spread, which is used to compute several secondary statistics like coherence bandwidth and data rate.