Perform indoor network planning with LTE and leaky feeder cables.
Model Type
The model consists of a large single-story building with leaky feeder cables
installed along a horizontal path. The cable has apertures along its entire length
to allow transmission and reception by means of signal leakage. Amplifiers are used
to boost the signal along these cables to improve signal transmission from the
transmitter to the receiver.
Sites and Antennas
Instead of using antennas, two leaky-feeder cables running side-by-side are used.
Tip: Click Project > Edit Project Parameter and click the Sites tab to adjust the
cable parameters.
The cables use the same carrier frequency of 2112.50 MHz but transmit different
MIMO streams.
Note: Click Project > Sites > Site: New and on the Transmitter Type dialog, click
Leaky Feeder Cable to define new leaky feeder
cables.
Air Interface
The air interface is defined by an LTE wireless standard
LTE_LeakyFeeder.wst file. (Orthogonal Frequency division
multiple access (OFDM/SOFDMA) was selected for multiple access. Two-streams MIMO
technology is used.
Tip: Click Project > Edit Project Parameter and click the Air Interface tab the view
the air interface as well as MIMO settings, carriers and transmission
modes.
Computational Method
The dominant path model (DPM) is used for the propagation modeling.
This computational method focuses on the most relevant path, which leads to shorter
computation times compared to ray-optical methods. Empirical losses for
transmission, reflection, and diffraction are used for computation of the signal
level. These parameters can readily be determined with measurements.
Tip: Click Project > Edit Project Parameter and click the Computation tab to change
the model.
Results
Propagation results show at every location the power received from each transmitting
cable. Results are available for a single prediction plane at a height of 1.5 m. As
the transmitting leaky feeder cables are placed close together, the results are
almost identical, see Figure 1 and Figure 2.Figure 1. The power for Site 1.
Figure 2. The power for Site 2.
The type of network simulation is a static simulation (homogeneous traffic per cell).
The network simulation calculates the following:
minimum required transmitter power
maximum achievable received signal strength
reception probability
data rate
maximum number of parallel streams
maximum signal-to-noise-and-interference ratio (SNIR) for all modulation and
coding schemes, and for both uplink and downlink
An example of signal-to-noise-and-interference ratio (SNIR) in the downlink is
displayed in Figure 3. Near
the lower-right corner, both the signal level and the SNIR are low. Consequently,
communication in that area is limited to modes with lower data rates.
