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Report No.: EM201300471-1 Application No.:
ZJ00032008 Page 44 of 57
participating in a given piconet are synchronized to the frequency-hopping channel for the
piconet. The frequency hopping sequence is determined by the master’s device address and
the phase of the hopping sequence (the frequency to hop at a specific time) is determined by
the master’s internal clock. Therefore, all slaves in a piconet must know the master’s device
address and must synchronize their clocks with the master’s clock.
Adaptive Frequency Hopping (AFH) was introduced in the Bluetooth specification to
provide an effective way for a Bluetooth radio to counteract normal interference. AFH
identifies “bad” channels, where either other wireless devices are interfering with the
Bluetooth signal or the Bluetooth signal is interfering with another device. The AFH-enabled
Bluetooth device will then communicate with other devices within its piconet to share detail
of any identified band channels. The devices will then switch to alternative available “good”
channels, away from the areas of interference, thus having no impact on the bandwidth used.
This device was tested with an Bluetooth system receiver to check that the device maintained
hopping synchronization, and the device complied with these requirements for CE153DR
and EN 300 328 V1.7.1 4.5.3.
EUT Pseudorandom Frequency Hopping Sequence
Pseudorandom Frequency Hopping Sequence Table as below:
Channel:08,24,40,56,40,56,72,09,01,09,33,41,33,41,65,73,53,69,06,22,04,20,36,52,38,46,70,
78,68,76,21,29,10,26,42,58,44,60,76,13,03,11,35,43,37,45,69,77,55,71,08,24,40,48,72,01,72
,01,25,33,12,28,44,60,42,58,74,11,05,13,37,45 etc.
The system receiver have input bandwidths that match the hopping channel bandwidths of
their corresponding transmitter and shift frequencies in synchronization with the transmitted
signals.
4.6.4 TEST RESULTS
This requirement does apply for equipment
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