Final report on link level and system level channel models - Winner

WINNER D5.4 v. 1.4
5.3 Description of key references
5.4 Results of analysis items
A list of analysis items was made, see [WP5AI]. The analysis items were divided into to categories
namely priority 1 and priority 2. In the following two subsections, selected set of analysis results from the
campaigns are listed. Additional results are found in the appendices and in the measurement <strong>report</strong>s
[WP5AR].
The measurements data that has been used for extraction of channel parameters for scenario B1 are not
WINNER measurement data but can be considered as background data from Helsinki University of
Technology, Finland. Sounder frequency is 5.3 GHz with 60 MHz chip rate and 120 MHz sampling rate
for each I and Q component of the signal. A cutting threshold of 20 dB from the peaks of PDPs is adopted
in the measurement results shown below. However, when there are good propagation conditions like LOS
cases, a higher threshold is used. It is said that propagation is LOS if an unobstructed path between the
location of the transmitter and the location of the receiver exists.
5.4.1 Path-loss and shadow fading
Path-loss (PL) and shadow fading (SF) are considered to be parameters of the highest priority in channel
modeling. Path-loss is loss of signal power between transmitter and receiver end. SF is the variance of the
PL.
The noise threshold was selected to be -20 dB from the impulse response (IR) peak, and the IR samples
below that are removed. Data within a small area is averaged in order to remove the effect of fast fading.
The averaging window depended on the environment and the centre-frequency. Spatial averaging is done
by combining the wideband MIMO matrices in power.
PL at a certain snapshot is calculated from the calibrated IRs as a wideband path loss
PL = −10log
( ∑ h(
)
10
τ i
2
τ
i
) + GT
+ GR
(5.1)
where G T and G R are antenna gains at the transmitter and at the receiver, respectively.
The path-loss model is derived using linear regression (LMSE) of the scatter plot of the PL vs. distance
between the transmitter and the receiver: PL(d) = A log 10 (d) + B = 10 n log 10 (d) + B, where B is PL
intercept, and n is the PL exponent.
5.4.1.1 Scenario A1
5.4.1.1.1 Measurements in corridor - corridor LOS conditions
The measurements were conducted in corridors, the width of which was ranging from 1.5 to 3.5, and so
that the BS and MS were in the same corridor with a LOS between them. The path-loss curve for the 5.25
GHz centre-frequency in corridor-corridor LOS propagation condition can be seen in the Figure 5.12.
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