Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1986-07-25
1989-07-18
Buczinski, Stephen C.
Pulse or digital communications
Spread spectrum
Direct sequence
375106, 375114, 371 47, H04L 700
Patent
active
048499951
ABSTRACT:
A digital signal transmission system includes a synchronization pattern detection circuit for detecting a synchronization pattern in response to a received transmitted digital signal, a pseudo synchronization detection circuit for detecting a pseudo synchronization pattern in the form of cyclic redundancy code in response to a received transmitted digital signal, and a synchronization protection circuit for counting the synchronization pattern detection signals produced when synchronization patterns are detected in response to a synchronization pattern detection signal from the synchronization pattern detection circuit. The synchronization protection circuit includes a main synchronization counter circuit and an auxiliary synchronization counter circuit. The count of protection steps for the confirmation of synchronization recovery of the auxiliary synchronization counter circuit in accordance with synchronization or asynchronization of the main synchronization counter circuit is variable.
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D. E. Dodds et al., "Robust Frame Synchronization for Noisy PCM Systems", IEEE Transactions on Communications, vol. COM-33, No. 5, May 1985, pp. 465-469.
A. Weinberg, "Search Strategy Effects on PN Acquisitions Performance", Proceedings IEEE National Telecommunications Conference, Nov. 29-Dec. 3, 1981, vol. 3, pp. F1.5.1-F1.5.5.
International Telegraph and Telephone Consultative Committee, Study Group XVIII Contribution 29.
1984 IEEE, Performance of the Cyclic Redundancy Check Code in the New 1.544 MB/S Extended Framing Format by A. B. Sripad et al.
Japanese Unexamined Patent Publication (Kokai) No. 59-161144 and English Abstract.
Kajiwara Masanori
Kunieda Toshinari
Moriya Takao
Nakaide Hiroshi
Ohhata Michinobu
Buczinski Stephen C.
Fujitsu Limited
Nippon Telegraph and Telephone Corporation
Wallace Linda J.
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