IEEE 802.15 <subject>

1
January, 2006
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Desktop Channel Measurements and Models Date
Submitted 18 January, 2006 Source C. Liu,
E. Skafidas, T. Pollock, K. Saleem Company
NICTA Address Dept of Electrical and
Electronic Engineering, University of Melbourne,
Parkville Victoria 3010 Voice61 3 8344 8407,
E-Mail stan.skafidas_at_nicta.com.au Re
Abstract Overview of Channel Measurements
and Channel Model for 60GHz Desktop
Channel Purpose Contribution for 802.15.3c
Task group 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.
2
Introduction

• Numerous desktop measurement made
• Measurements were made at different times and
  location on the same and different desktops
• The Saleh-Valenuela (S-V) model is used to model
  the desktop environment.
• Key S-V model parameters such as Cluster Decay
  Factor, Ray Decay Factor, Cluster Arrival Rate,
  and Ray Arrival Rate are extracted from the
  measured data.

3
Measurement Setup

• An Anritsu 37397 Vector Network Analyzer (VNA)
  was used to measure the channel transfer
  function.
• The outputs of the amplifiers where connected to
  the antennas used in the experiment.
• The two antennas were mounted on tracks and the
  directional receive antenna was attached to an
  electronically steerable platform that permitted
  the angle of the antenna to be precisely and
  automatically controlled
• In this setup the VNA was set to sweep between
  55-65GHz with a frequency step of 6.25MHz for
  1601 data points.

4
Measurement Setup

• An omni-directional antenna is employed at the
  transmitting side
• A 21dBi directional pyramidal horn antenna at the
  receiving side.
• The antennae voltage standing wave ratios were
  better than 1.51 over the entire frequency of
  interest.
• The antennae were mounted on rails that permit
  the precise and automatic positioning required at
  60 GHz (5mm wavelength).
• For AoA measurements a directional antenna was
  mounted on an electronically steerable platform
  for precise angular measurements from 0 to 360
  degrees in 4 degree steps.
• For each angle the time impulse response was be
  measured.

5
Measurement Setup
6
Measurements
7
Measurements

• Angle of Arrival Profile for the desktop pictured
  in Figure 1.
• Note that signal is received in multiple angles
  in azimuth.

8
Measurements

• Power delay profile measured at desk pictured in
  Figure 1.
• Note the delay and relative reduction of power of
  the signal received at 308 degrees in azimuth.

9
Model

• SV model
• cluster arrival rate
• ray arrival rate (within each cluster)
• cluster decay factor
• ray decay factor
• cluster and ray log-normal standard deviation

10
Parameter Extraction

• Normal probability plot of the log of the power
  amplitude of rays received within a cluster.

11
Parameter Extraction

• Plot of log of Cluster Power versus time.
• Gradient is equal to inverse of Cluster Decay
  factor.

12
Parameter Extraction

• Plot of log of Ray Power versus time.
• Gradient is equal to inverse of Ray Decay factor.

13
Extracted SV parameters

• Parameters
• cluster arrival rate 0.30
• ray arrival rate (within each cluster) 8.73
• cluster decay factor 1.47
• ray decay factor 1.00(dB),
• cluster log-normal standard deviation 2.1
• ray log-normal standard deviation 2.4