Method for synchronizing bluetooth packets

Details Method for synchronizing bluetooth packets Method for synchronizing bluetooth packets

2007-11-13

2007-11-13

Orgad, Edan (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

Reexamination Certificate

active

10378036

ABSTRACT:
In Bluethooth medium rate packets, the access code and the header are frequently modulated by Gausian Frequency Shift Keying, and the actual payload is phase-modulated by a differential Quadrature Phase Shift Keying or an 8-ary DQPSK scheme. Guard time and a synchronization sequence are placed between the header and the payload parts because of the need to change the modulation scheme and because of the ease in packet transfer. A sequence having a form of ABA is added to a Barker sequence having a form of BABBAAA for providing the synchronization sequence having the form of ABABABBAAA, where A and B are different states in a binary representation.

REFERENCES:
patent: 7053814 (2006-05-01), Yap
patent: 7142880 (2006-11-01), Schmandt et al.
patent: 2004/0076117 (2004-04-01), Madapushi et al.
patent: 2004/0109431 (2004-06-01), Abrahamson et al.
Bluetooth 1.1 Connect Without Cables,2nd Edition; J. Bray et al.; Prentice Hall, Inc., New Jersey; 2002; pp. 49-57.
“Radio 1.0 Improvements: Medium Rate Baseband Specification Proposal for version 0.7, Team BT1-MED”; H. Kafemann et al.; Bluetooth SIG; Jan. 2002; pp. 1-19.

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