Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-11-22
1990-10-23
Olms, Douglas W.
Pulse or digital communications
Spread spectrum
Direct sequence
3701051, H04L 700
Patent
active
049658840
ABSTRACT:
A method and apparatus are provided for receiving parallel digital data signals and an aligned frame pulse. The frame pulse occurs at a regular interval which is a multiple of the data clock period. A multiple clock sampling scheme includes sampling the frame pulse using a plurality of phase-shifted clock signals, selecting several clock signals which are centered on the frame pulse and therefore the data. Then, sampling the data using the selected clocks, taking a majority value of the multiple samples and aligning the sampled data with a locally generated frame pulse using an elastic store.
REFERENCES:
patent: 4672639 (1987-06-01), Tanabe et al.
patent: 4756011 (1988-07-01), Cordell
patent: 4757452 (1988-07-01), Scott et al.
patent: 4791652 (1988-12-01), McEachern et al.
patent: 4805198 (1989-02-01), Stern et al.
Gauthier John A.
Hill Trevor R.
MacKenzie Simon A.
Okura David K.
Chin Stephen
Northern Telecom Limited
Olms Douglas W.
Smith Dallas F.
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