Agilent Technologies N9010A - Manual (Page 203)

Chapter 21 203
Bluetooth Measurement Application
Enhanced Data Rate (EDR) Measurements
Description Specifications Supplemental Information
EDR In-band Spurious
Emissions This measurement is an EDR
in-band spur emissions and is in
conformance with Bluetooth RF
test specification 2.1.E.0.5.1.15.
Packet Type 2-DH1, 2-DH3, 2-DH5, 3-DH1,
3-DH3, 3-DH5
Payload PRBS9, BS00, BSFF, BS55
Synchronization DPSK synchronization sequence
Trigger External, RF Burst, Periodic
Timer, Free Run, Video
Measurement Accuracy
a
Offset Freq =
1 MHz to 1.5 MHz
Dominated by ambiguity of the
measurement standards
b
Offset Freq = other offsets
(2 MHz to 78 MHz)
Dominated by the variance of
measurements
c
a. For offsets from 1 MHz to 1.5 MHz, the accuracy is the relative accuracy which is the adjacent channel
power (1 MHz to 1.5 MHz offset) relative to the reference channel power (main channel). For other
offsets (offset = K MHz, K= 2,…,78), the accuracy is the power accuracy of the absolute alternative
channel power.
b. The measurement standards call for averaging the signal across 3.5 µs apertures and reporting the high-
est result. For common impulsive power at these offsets, this gives a variation of result with the time
location of that interference that is 0.8 dB peak-to-peak and changes with a scallop shape with a 3.5 µs
period. Uncertainties in the accuracy of measuring CW-like relative power at these offsets are nomi-
nally only
± 0.09 dB, but observed variations of the measurement algorithm used with impulsive inter-
ference are similar to the scalloping error.
c. The measurement at these offsets is usually the measurement of noise-like signals and therefore has
considerable variance. For example, with a 1.5 ms packet length, the standard deviation of the measure-
ment of the peak of ten bursts is about 0.6 dB. In comparison, the computed uncertainties of the mea-
surement for the case with CW interference is only
±0.29 dB .