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ThinkMind // ICWMC 2011, The Seventh International Conference on Wireless and Mobile Communications // View article icwmc_2011_2_30_20143


The Impact of Antenna Directivity and Channel Bandwidth on the Power Spectral Density of Wideband and UWB MISO Channels

Authors:
Ana-Maria Pistea
Tudor Palade
Ancuta Moldovan
Hamidreza Saligheh Rad

Keywords: Keywords-WB; UWB; MIMO; wireless channel; PSD.

Abstract:
Abstract--- The combination of MIMO with wideband (WB) and ultra-wideband (UWB) systems imply many new effects, which make the conventional channel models developed for narrowband transmissions to be inadequate for communications with large bandwidth. In this paper we use the Fourier analysis of the cross-correlation functions (CCF)s between the space-time-frequency (STF) transfer functions of two sub-channels of an outdoor WB/UWB MIMO wireless channel to derive the power spectral density (PSD) in a stationary scenario. The assumptions of the stationary scenario transform the MIMO channel into a Multiple-In Single-Out (MISO) channel and the PSD is determined when the channel bandwidth is wide or ultra-wide. The Fourier analysis of the CCF reveals the fact that the PSD deviates from the U-shaped function, i.e., Clarke/Jake’s model to a great extent. This deviation is strongly influenced by the antenna directivity and the channel bandwidth. One major phenomenon which become stronger when the bandwidth increases is the frequency selectivity which is obviously larger in case of UWB channels than in case of WB channels. This characteristic makes possible the recognition of the type of the channel for its bandwidth from its PSD only.

Pages: 36 to 41

Copyright: Copyright (c) IARIA, 2011

Publication date: June 19, 2011

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-140-3

Location: Luxembourg City, Luxembourg

Dates: from June 19, 2011 to June 24, 2011

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