Method and apparatus for communicating interleaved data

Details Method and apparatus for communicating interleaved data Method and apparatus for communicating interleaved data

1992-08-10

1993-08-31

Cain, David C.

Pulse or digital communications

Repeaters

Testing

375 68, 380 34, 455 331, 370 18, 370 21, 370 22, H04K 110

Patent

active

052415635

ABSTRACT:
An interleaver processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver. The pseudorandom interleaved data is processed at the deinterleaver in a pseudorandom order corresponding to that used at the interleaver means, to recover the original information. The pseudorandom processing at the deinterleaver is synchronized with the pseudorandom processing at the interleaver on a trial and error basis. In one embodiment, full synchronization occurs when a Viterbi decoder receiving data from the deinterleaver has a renormalization rate within a designated threshold and when enough synchronization words are detected in data output from the deinterleaver to meet a predetermined criterion. In another embodiment, a timer is used to initiate a new starting address for the pseudorandom processing at the deinterleaver during successive time intervals. Synchronization is achieved when a start address is found that results in the detection of enough synchronization words in data output from the deinterleaver to meet a predetermined synchronization criterion.

REFERENCES:
patent: 5060266 (1991-10-01), Dent
patent: 5081679 (1992-01-01), Dent
patent: 5103459 (1992-04-01), Gilhousen et al.
Bernard Sklar, "Digital Communications Fundamentals and Applications", Prentice Hall, 1988, pp. 357-364.

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