RE: stds-802-16-tg4: Channel and Interference models.
The number one interference issue confronting the TG4 ( as demonstrated by
my TG4 contribution based on USA and ITU-R UNII devices interference to
SAR-4 analysis) is that the interference requirements for Synthetic Aperture
Radar SAR-4 sensors can be exceeded by one (1) WirelessHUMAN-based device
with omni directional antenna, operating in the Middle U-NII band of
5.25-5.35 GHz. Considering the SAR-4 has a 57 square Km foot print the
probability of exceeding the interference requirement of an SAR-4 by a TG4
standard-based device using an omni-directional antenna is very close to
unity. Unless we find a solution to this problem the Wireless HUMAN-based
systems will never be permitted as they will interfere with the global
primary in this band. If in doubt, See page 2 of Mr. Julius Knapp
presentation to 802.16 last week. So this problem should be given TG4
priority as far as this band is concerned.
Zion Hadad had suggested in our TG4 meeting last week turning off the
Wireless HUMAN devices in an area when the Satellite is passing the area.
Perhaps he can follow up this suggestion with a contribution on how to do
such approach, so we can evaluate it. Others may suggest other approaches.
I believe this problem requires our attention now!
I also not what I heard Phil Whitehead ( Coexistence Study Group Chair) say
in the 802.16 Plenary (in reply to my questions) is that interference model
work will be under the new PAR for Coexistence, and it will be TG4's
responsibility to find the appropriate protocols to cope with the
interference model derived by the new Coexistence group.
Please do not shoot the messenger for it is unfair and that will not resolve
the problem!
Dr. Demosthenes J. Kostas
Director, Industry Standards
Adaptive Broadband Corporation
3314 Dartmouth Ave
Dallas, TX 75205 USA
tel: 214 520 8411
fax: 214 520 9802
-----Original Message-----
From: Tal Kaitz [mailto:talk@breezecom.co.il]
Sent: Monday, March 19, 2001 7:15 AM
To: 'stds-802-16-tg4@ieee.org'
Subject: stds-802-16-tg4: Channel and Interference models.
Colleagues,
Let's get the work on channel and interference models going.
Please submit any contributions or informal ideas you have.
As I see it, our task is to define:
(a) A set of channel models
(b) A set of interference models.
The models will be used evaluate different contributions and to optimize
design parameters.
For item (a) we may rely on the work of Erceg et al.
(http://grouper.ieee.org/groups/802/16/tg3/contrib/802163c-01_29r1.pdf).
This is the model used in TG3. This document is about to be updated in a
couple of weeks, so keep track on the updated version.
For item (b) we may try to use work by other IEEE workgroups, though I have
no relevant pointers yet.
best regards,
Tal Kaitz
BreezeCOM