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| R2011b Documentation → Communications System Toolbox | |
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doppler.bell
doppler.bell(coeffbell)
doppler.bell creates a bell Doppler spectrum object. You can use this object with the DopplerSpectrum property of any channel object created with either the rayleighchan function, the ricianchan function, or the mimochan function.
dop = doppler.bell creates a bell Doppler spectrum object with default coefficient.
dop = doppler.bell(coeffbell) creates a bell Doppler spectrum object with coefficient given by coeffbell, where coeffbell is a positive, finite, real scalar.
The bell Doppler spectrum object has the following properties.
| Property | Description |
|---|---|
| SpectrumType | Fixed value, 'Bell' |
| CoeffBell | Bell spectrum coefficient, positive real finite scalar. |
A bell spectrum was proposed in [1] for the Doppler spectrum of indoor MIMO channels, for 802.11n channel modeling.
The normalized bell Doppler spectrum is given analytically by:
where
and
fd represents the maximum Doppler shift specified for the channel object, and A represents a positive real finite scalar (CoeffBell). The indoor MIMO channel model of IEEE 802.11n [1] uses the following parameter: A = 9. Since the channel is modeled as Rician fading with a fixed line-of-sight (LOS) component, a Dirac delta is also present in the Doppler spectrum at f = 0.
[1] IEEE P802.11 Wireless LANs, "TGn Channel Models", IEEE 802.1103/940r4, 2004-05-10.
doppler | doppler.ajakes | doppler.flat | doppler.gaussian | doppler.jakes | doppler.rjakes | doppler.rounded | rayleighchan | ricianchan | stdchan
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