Ultrawideband channel modeling on the basis of information-theoretic criteria
AuthorsUlrich G. Schuster and Helmut Bölcskei
ReferenceIEEE Transactions on Wireless Communications, Vol. 6, No. 7, pp. 2464-2475, July 2007.
AbstractWe present results of two indoor ultrawideband (UWB) channel measurement campaigns in the 2-5 GHz frequency band. In measurement campaign I (MCI), the channel is static and we sample it spatially, while in MCII the transmitting and receiving antennas are fixed and channel variation is induced by people moving in the environment. Transmitter and receiver are separated by up to 27 m in MCI, and up to 20 m in MCII. To determine suitable small-scale fading distributions for the tap amplitudes of the discrete-time baseband-equivalent channel impulse response, we use Akaike's Information Criterion (AIC). Despite the large bandwidth, AIC supports the Rayleigh (MCI) or the Rice distribution (MCII). For data from MCII, we estimate the covariance matrix of the random channel impulse response, and demonstrate that the number of corresponding significant eigenvalues, and hence the diversity order of the channel, scales approximately linearly with bandwidth. Contrary to the uncorrelated scattering assumption, we find that the channel taps are weakly correlated. The ergodic capacity predicted by the Ricean channel model with parameters estimated from MCII shows good agreement with the ergodic capacity obtained by direct evaluation of the measurement results, while the corresponding outage capacities show a worse fit for low outage probabilities because of shadowing.
KeywordsUltrawideband (UWB) communication, channel modeling, Akaike's Information Criterion (AIC), Rayleigh channels, Ricean channels, uncorrelated scattering (US)
CommentsThe raw measurement data from both measurement campaigns can be downloaded here.
Download this document:
Copyright Notice: © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.