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Chapter 7 203
Bluetooth Signals
Setting up Impairments
Setting up Impairments
The steps in this procedure build upon the previous procedure. This procedure teaches you
how to set up the parameters for the impairment function.
1. Press
Return > Return > Impairments.
This accesses a menu which enables you to set up impairments.
2. Press
Freq Offset > 25 > kHz.
3. Press
Freq Drift Type Linear Sine.
This sets the frequency drift type to linear. Linear frequency drift will occur across a period
of time equal to the duration of one fully loaded DH1 packet, regardless of the packet
length. The default setting is the sine drift deviation which is plus or minus from the
carrier center frequency.
4. Press
Drift Deviation > 25 > kHz.
This sets the maximum deviation of the frequency drift of the carrier frequency.
5. Press
Mod Index > .325 > Enter.
Modulation index is defined as the ratio of peak-to-peak frequency deviation to the bit
rate. When modifying the Mod Index parameter, the peak-to-peak frequency deviation only
is changed.
6. Press
Symbol Timing Err > 1 > ppm.
This sets the symbol timing error in parts per million.
7. Press
AWGN.
This accesses a menu from which you can select the parameters of the additive white
Gaussian noise (AWGN) to be applied as an impairment to the Bluetooth signal. The
following parameters may be changed while AWGN is off, but will not be applied unless
AWGN and Impairments are both turned on.
a. Press
C/N [1MHz] > 20 > dB.
This sets the carrier-to-noise ratio for a 1 MHz bandwidth.
b. Press
Noise Seed > 2 > Enter.
This sets the noise seed value used to assign a specific sequence of noise to be added to
the basic Bluetooth signal. The noise seed is used to initialize the 16-bit shift register
used for noise generation. Different noise seeds generate different combinations of
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