Correlation of access code for bluetooth synchronization
AssigneeST-Ericsson SA
InventorsPietro Capretta, Viktor Belokonskiy, Alberto Gozzi
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Abstract
A circuit for processing a packet based signal received over a Bluetooth radio link has a correlator to detect at least part of the access code. A correlator controller, reconfigures the correlator according to a timing of the access code, to detect at least part of the EDR synchronization sequence, and a demodulator demodulates the payload according to the detection. The correlator has an input signal register, a buffer for a sequence of at least part of the wanted signal values, and a series of comparators arranged to compare input signal values with corresponding ones of the wanted signal values at more than one offset. By such dual use of the same correlator, the receiver can be made more cost effective.
Claims31
A circuit for processing a packet based signal received over a radio link and having a data packet having an access code modulated using a first modulation scheme and a synchronization sequence for a payload modulated using a second modulation scheme, the circuit comprising:
- a correlator arranged to detect at least part of the access code,
- a correlator controller to reconfigure the correlator according to a timing of the access code, to detect at least part of the synchronization sequence, and
- a demodulator for demodulating the payload according to a timing of the synchronization sequence.
A method of processing a packet based signal received over a radio link, the signal having a data packet having an access code modulated using a first modulation scheme and a synchronization sequence for a payload modulated using a second modulation scheme, the method comprising acts of:
- detecting at least part of the access code using a correlator,
- reconfiguring the correlator according to a timing of the access code, to detect at least part of the synchronization sequence, and
- demodulating the payload according to a timing of the synchronization sequence.
A circuit comprising:
- a correlator configured to detect at least part of a received access code in at least one data packet of a communication link using a first correlation scheme;
- and
- a correlator controller configured to reconfigure the correlator to detect at least part of a received synchronization sequence in the at least one packet using a second correlation scheme, the reconfiguring responsive to the detection of the at least part of the access code, wherein
- the access code is modulated according to a first modulation scheme and the synchronization sequence is modulated according to a first modulation scheme different from the first modulation scheme.
Dependencies are inferred from the claim text.