Propagation%20pathloss%20for%20TG4-Range-Issue

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Propagation Pathloss for TG4 Range Issue Date
Submitted 24 August 2004 Source Colin
Lanzl Address 83 Nottingham Drive, Nashua, New
Hampshire, 03062, USA Voice 781-687-0578, FAX
781-276-4001, E-Mail clanzl_at_ieee.org Re
Pathloss model for TG4 in support of TG4a range
comparison. Abstract This document provides a
pathloss model to be used to determine TG4 device
ranges for use in comparing proposals for
TG4a. Purpose This document is provided in
support of TG4a activities. 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
Propagation Pathloss model

• Colin Lanzl clanzl_at_ieee.org
• Kai Siwiak k.siwiak_at_ieee.org

3
Propagation pathloss model description

• Model provides for free-space propagation (1/r2)
  in a near-zone propagation and far-zone
  propagation as 1/r?.
• Model provides for a breakpoint, dt, between
  near-zone and far-zone.
• Model can be used for both narrow-band and
  wide-band applications.
• With suitable definition of dt , model can be
  used for both indoor and two-ray propagation.

4
Model

• PL(d ) -10logc/(4p d fm)2 1-exp(-(dt
  /d)(g-2)),
• where
• PL pathloss,
• d distance between transmitter and receiver,
• fm geometric mean of transmitted frequency
  band,
• g propagation constant after breakpoint,
• c velocity of propagation,
• and
• dt breakpoint distance from transmitter.

5
Indoor Parameters

• dt is physically defined by the environment, as
  it represents the distance of the first
  scatterers from the transmitter suggested indoor
  office value is 3m (???)
• In an indoor environment ,the suggested value for
  g is 3.3 (??)

6
Outdoor Parameters

• Outdoors, a two-ray model (propagation over a
  ground plane) is appropriate
• Suggested parameters
• dth1h24pfm/c and g4,
• where
• h1 and h2 are the transmit and receive antenna
  heights (in meters) above the ground plane.