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Hi Steve, Perhaps my notation was a little unclear. The
interpretation I was applying was aligned with your first interpretation. So in
summary: 1m to 500m: n=2 501m to 1000m: n=2.5 1001m to 4000m: n=3.5 4001m and greater: n=4 I will add this clarification, and the
model itself, to the propagation model section of the simulation parameters
document I’m currently working on. I recall a comment, I think from Amir Ghasemi,
suggesting the use the SUI large-scale fading model. This will take factors
such as base station and subscriber station antenna heights into account. I’m
sure this SUI model can be added to the simulation parameters document as it
matures, or at least a definition of what assumptions should apply to configure
the model. Hope this helps. Thanks, Paul. NextWave Broadband From: Shellhammer,
Steve [mailto:sshellha@qualcomm.com] Paul,
I have a question about the path loss model you used in presentation
802.16h-07/38r1 on slide 11.
The slide says the model is, Propagation
model – d1=1m, d1=500m,
d2=1000m, d3=4000m – n1=2, n2=2.5,
n3=3.5, n4=4
I am a bit unclear on this. There are four breakpoints and four
exponents. Typically, there are N breakpoints and N+1 exponents.
One interpretation is that the free space exponent of 2 is used between 1 and
500 meters. Another interpretation is that free space is up to 1 meter
and the exponent of 2.5 is used between 1 and 500 meters.
Can you clarify your path loss model?
I think it would be useful to have a common path loss model for everyone to
use. Thanks, Steve |