Construct bell-shaped Doppler spectrum object
doppler.bell creates a bell Doppler spectrum object. You can
use this object with the
of any channel object created with either the
ricianchan function, or
comm.MIMOChannel System object™.
doppler.bell creates a bell Doppler
spectrum object with default coefficient.
doppler.bell(coeffbell) creates a
bell Doppler spectrum object with coefficient given by
coeffbell is a positive, finite, real scalar.
The bell Doppler spectrum object has the following properties.
|SpectrumType||Fixed value, 'Bell'|
|CoeffBell||Bell spectrum coefficient, positive real finite scalar.|
A bell spectrum was proposed in  for the Doppler spectrum of indoor MIMO channels, for 802.11n channel modeling.
The normalized bell Doppler spectrum is given analytically by:
fd represents the
maximum Doppler shift specified for the channel object, and A represents
a positive real finite scalar (
indoor MIMO channel model of IEEE 802.11n  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.
Construct a bell Doppler spectrum object with a coefficient of 8.5. Assign it to a Rayleigh channel object with one path.
dop = doppler.bell(8.5); chan = rayleighchan(1e-5, 10); chan.DopplerSpectrum = dop;
 IEEE P802.11 Wireless LANs, "TGn Channel Models", IEEE 802.1103/940r4, 2004-05-10.