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Report No.: EM201300534-1 Application No.:
ZJ00032799 Page 44 of 56
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
,78,68,76,21,29,10,26,42,58,44,60,76,13,03,11,35,43,37,45,69,77,55,71,08,24,40,48,72,01,7
2,01,25,33,12,28,44,60,42,58,74,11,05,13,37,45 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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