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

WINNER D5.4 v. 1.4
6. Channel Model Implementation
The purpose of this chapter is to discuss issues concerning implementation of the WINNER channel
model.
6.1 Overview for implementing the model
WINNER channel model needs as an input the general information like channel scenario and MIMO
setup, antenna configurations like radiation patterns and array geometries and system layout information
like relative distances and orientations of the transceivers. Output of the model is a set of discrete channel
impulse responses with matrix coefficients (see eq 3.26). Entries of the matrices are complex channel
coefficients for each transmitter receiver antenna element pairs. Channel impulse responses are
realisations of the radio channel for discrete time instants and for different radio links.
6.1.1 Time sampling and interpolation
Channel sampling frequency has to be finally equal to the simulation system sampling frequency. To have
feasible computational complexity it is not possible to generate channel realisations on the sampling
frequency of the system to be simulated. The channel realisations have to be generated on some lower
sampling frequency and then interpolated to the desired frequency. A practical solution is e.g. to generate
channel samples with sample density (over-sampling factor) two, interpolate them accurately to sample
density 64 and to apply zero order hold interpolation to the system sampling frequency. Channel impulse
responses can be generated during the simulation or stored on a file before the simulation on low sample
density. Interpolation can be done during the system simulation.
6.1.2 Coordinate system
System layout in the Cartesian coordinates is for example the following:
Figure 6.1: System layout of multiple base stations and mobile stations.
All the BS and MS have (x,y) coordinates. MS and cells (sectors) have also array broad side orientation,
where north (up) is the zero angle. Positive direction of the angles is the clockwise direction.
Table 6.1: Transceiver coordinates and orientations.
Tranceiver Co-ordinates Orientation [°]
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