Introduction to Bluetooth Measurements (K8)
R&S
®
FSV-K8
17
Operating Manual 1176.7610.02 ─ 02
Digital bandwidth
(flat area)
Points per Symbol
Sampling rate
10 MHz
32
32 MHz
8 MHz
16
16 MHz
5 MHz
8
8 MHz
3.0 MHz
4
4 MHz
1.6 MHz
2
2 MHz
According to the RF Test Specification an oversampling factor of 4 is required at mini-
mum. For Basic Rate measurements, this oversampling factor can be selected as
oversampling factor in a range from 2 to 32. For EDR–measurements, the oversam-
pling factor is fixed to 4 which is also the default value.
Although possible, a value greater than 4 is not recommended. It increases the mea-
surement time due to the extended calculation effort. Additionally, the resulting band-
width will be larger than required, which leads to lower measurement accuracy, unless
the optional measurement filter (Meas Filter On) is used as described in
The spectrum analyzer uses a timing offset correction in order to move the samples to
the zero trespassing points. As a result there is one sample per symbol time, which is
especially important for a 0101 symbol sequence in order to obtain the precise value
for the peak frequency deviation.
Sampling times before timing offset correction
Sampling times after timing offset correction
Advantages of the timing offset correction:
●
No jitter with low sampling rates
●
With one sample per zero, the trespassing point is always a sample in the middle
of the bit length. Therefore the maximum values in the frequency deviation of 0101
bit patterns can be detected precisely also with low sampling rates.
●
The immunity to interference when determining the data bits is improved.
●
Higher suppression of the distortion during peak detection.
Oversampling
