| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士班 === 99 === A comparison of ultra-wideband (UWB) communication characteristics for five different geometrical shapes of roof in the materials of concrete and iron in the same environments are investigated. These five roofs include the flat shape roof, the triangle shape roof, the arched shape roof, the pyramid shape roof, and the mansard shape roof.
The impulse responses of these roofs are computed by applying shooting and bouncing ray/image (SBR/Image) techniques and inverse Fourier transform. By using the impulse response of these multi-path channels, the mean excess delay, root mean square (RMS) delay spread, and the number of multi-path arrivals within 10 dB of the peak multi-path arrival (NP10dB), and the number of paths required to meet the 85% energy capture threshold (NP(85%)) for these five roofs could be obtained. Numerical results show that the RMS delay spread for the pyramid shape roof is smaller than those for the other shapes. And the RMS delay spread for the flat shape roof is greater than the other roofs. Finally, the outage probability for binary antipodal-pulse amplitude modulation (B-PAM) system has been calculated.
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