Bluetooth Measurements (Option K8) R&S FSL
1300.2519.12 2.38 E-11
Structure of a Bluetooth data packet
Every Bluetooth data packet is divided into 3 basic section: access code, header and payload. The
following figures show the order and bit lengths of the individual sections:
access code 72 bits
4 bits
preamble
64 bits
sync word
4 bits
trailer
54 bits
header
240 / 1496 / 2744 bits
payload*)
*) During EUT evaluation the payload contains certain bit sequences: PRBS9 (Pseudo Random Bit
Sequence) or 11110000 or 10101010.
The sync word is transmitted as the major part of the access code. For this purpose, the LAP (lower
address part) of the BD address is expanded to 64 bit by adding the BCH code and baker.
sync word 64 bits
BCH code 34 bits LAP 24 bits Barker 6 bits
The LAP (lower address part) of the BD address serves as a basis for the sync word.
BD – address 48 bits
NAP 16 bits UAP 8 bits LAP 24 bits
In case of EDR packets the payload is divided into 6 other sections:
DPSK
guard
5Rs
SYNC payload
header
user payload
0–2723Symb
CRC
code
trailer
Supported Tests
The Bluetooth Measurements Option supports measurements according to the Bluetooth RF Test
Specification (Bluetooth SIG) , Revision 2.0.E.3, Mar 2005, on the R&S FSL. The following tests are
currently implemented according to this specification:
Output Power
TX Output Spectrum – Adjacent Channel Power
Modulation Characteristics
Initial Carrier Frequency Tolerance (ICFT)
Carrier Frequency Drift
EDR Relative Transmit Power
EDR Carrier Frequency Stability and Modulation Accuracy
EDR Differential Phase Encoding
EDR In–band Spurious Emissions
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