9 GHz, High)
PL (NJ, LOS)
Beijing Micro Cell Model
Micro Cell Model
Trenton, NJ (Hi BS)
Dallas (LOS)
Brooklyn, NY
Korea (2.3 GHz, NLOS)
FIGURE 3.46 Microcell path loss summary.
environments, and so forth. Another observation that can be made is that there is a two-slope response.
The point where the two-sloped lines meet is called the ???knee??? or ???break point??? of the curve. This break
point can be calculated as shown in [91] and can be approximated for high carrier frequencies as
(3.80)
The typical values of this break point occur in the hundred of meters range.
We have chosen to plot a variety of measurements [123, 125]. These measurements include countries
such as UK, USA, China, and Korea. We have included additional results from various USA
cities: California, Trenton, N.J., and Brooklyn, N.Y. In this microcell case we can see for a distance
of 500 m the difference in path loss is between 65 to 105, in other words approximately 40 dB
difference. This observation has been made neglecting measurement results from Trenton, N.J.,
which provides the worse case losses.
In order to further emphasize the above observations we have collected a subset and have shown them
below. As an example, the breakpoint for the New Jersey results was found to be approximately 200 m.
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