IEEE 802'15 subject

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
UWB Channel Modeling Amplitude
Distribution Date Submitted 6 September,
2002 Source Qinghua Li and Jeff
Foerster Company Intel Research and
Development Company Intel Corporation Address
JF3-212, 2111 N.E. 25th Ave., Hillsboro, OR,
97124 Voice 503-264-6859, FAX [phone]
E-Mailjeffrey.r.foerster_at_intel.com Re This
presentation contains new results on the UWB
amplitude distribution derived from Intels
channel measurements. Abstract This
contribution compared the Nakagami distribution
to the log-normal and Rayleigh distributions for
modeling the amplitude fluctuations derived from
the Intel channel sounding measurements from 2-8
GHz. Purpose The purpose of this presentation
is to assist the channel modeling sub-committee
in selecting models and parameters for the UWB
channel model. Notice This document has been
prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
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Recent results on UWB amplitude distributions

• Qinghua Li and Jeff Foerster
• Intel Research and Development
• Intel Corporation

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Amplitude Distribution Hypothesis Test Results

• There are three candidate distributions, i.e.,
  Lognormal, Nakagami, and Rayleigh.
• Recovered signal amplitudes are tested by
  hypothesis tests to determine if the amplitudes
  has one of the three distributions.
• The results demonstrate that Lognormal and
  Nakagami have the best fit.

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Cumulative Density Function Fitting

• Both Lognormal and Nakagami fit the empirical
  cumulative density function well.

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Standard Deviation of Log Amplitude

• The standard deviation of log amplitude decreases
  as excess delay increases.

The standard deviation of log amplitude. The
antenna separation ranges are 1-5 meters and 5-20
meters.
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The Order of Nakagami Distribution
The order m of Nakagami distribution. The
antenna separation ranges are 1-5 meters and 5-20
meters. The energy of each channel realization
is normalized to unity.
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Conclusions

• The Nakagami and Log-normal distributions seems
  to match the amplitude fading equally well.
• Either is a good choice for the UWB channel
  model.