Recovery of frame alignment word having bits distributed in a di

Details Recovery of frame alignment word having bits distributed in a di Recovery of frame alignment word having bits distributed in a di

1985-04-22

1987-02-24

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375113, 375114, H04L 700

Patent

active

046463291

ABSTRACT:
A frame alignment word has N predetermined bits distributed in the frame of a digital transmission signal. Each frame is divided into a number of sectors. Each sector has a heading made up of a bit or a bit group from the alignment word such that when placed end to end the headings in the frame form the alignment word. According to a frame alignment recovery method, bit groups are successively taken from the digital signal received at the sector frequency, each taken group having a maximum bit number equal to the bit number in each heading. The taken bit groups are compared with the heading bits corresponding in the frame alignment word and N-1 circular permutations thereof. The comparison are halted before reaching the full alignment word once the comparison of bits between the heading bits and taken successive groups reveals some disagreement.

REFERENCES:
patent: 3575554 (1971-04-01), Schmidt

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