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Design Notes

Single-Input-Single-Output Channel:

This part of the example shows the response of a multipath fading channel to a constant input.  The MULTIPATH_FADING block is configured to simulate a standard GSM Rural Area channel profile with 6 paths.  The vehicle velocity is set to an unrealistically large value of 400e3 km/h in order to be able to observe the shape of the channel output spectrum.  The GSM Rural Area profile contains a Rice fading tap with the specular component at 70% of the maximum Doppler spread, and 5 Rayleigh fading components, all with pre-determined delay/attenuation values.  The temporal and spectral responses at the output of the channel are shown.

The GSM channel profiles are defined in the following reference:

[1] 3GPP TS 45.005 V6.7.0 (2004-11), "Radio Access Network; Radio transmission and reception (Release 6)"

Single-Input-Multiple-Output Channel:

This part of the example illustrates an antenna array at the receiver.  Array element locations are defined in a two-dimensional plane as a function of the wavelength. The channel imposes a simple frequency shift FO on the input signal, which is assumed to be received from an angle of incidence AOI.  The values FO and AOI are swept over a range of values and the temporal and frequency response at each array element is shown in the two corresponding graphs.

Multiple-Input-Multiple-Output Channel:

This part of the example illustrates a MIMO channel with two inputs and two outputs.  Fading between each of the TX and RX antennal elements is assumed to be independent.  The fading profile for each TX/RX antenna element pair is modeled as a GSM Rural Area 6 path profile.  Again, the vehicle velocity is set to an unrealistically large value to be able to observe the spectral response of the channel.

System Diagram - SIMO 1 in x 4 out Channel Example

System Diagram - MIMO 2 in x 2 out Channel Example

System Diagram - SISO Channel Example

Graph - MIMO 2 in x 2 out Channel Output Spectrum

Graph - MIMO 2 in x 2 out Channel Output Magnitude

Graph - SISO Channel Output Spectrum

Graph - SISO Channel Output Magnitude

Graph - SIMO 1 in x 4 out Channel Output Spectrum

Graph - SIMO 1 in x 4 out Channel Output I Q