Synchronization sequence decoder for a digital radiotelephone sy

Details Synchronization sequence decoder for a digital radiotelephone sy Synchronization sequence decoder for a digital radiotelephone sy

1985-08-30

1987-03-10

Smith, Jerry

Excavating

371 5, 455 33, 375116, G06F 1100

Patent

active

046495436

ABSTRACT:
A decoding system and method is disclosed for a radiotelephone system carrying digital messages. A set of multibit high auto-correlation, low cross-correlation synchronization words and their ones complement inverses are employed for message synchronization and supervisory functions. System state communication is achieved by utilizing a sequence of normal synchronization words and their ones complement inverses. Reliability of the coding is achieved by detecting normal or inverse words as binary levels when fewer than a predetermined number of bit errors exist in the bit sequence. If the predetermined number of bit errors is exceeded, a selected binary one or zero is substituted. This selected sequence of binary levels is decoded and the Hamming distance between a masked decoded sequence and a masked selected sequence is calculated. If the Hamming distance calculated yields a number less than or equal to a number equal to the synchronization error correction capability of the coding function, the decoded sequence is accepted as correct. If the Hamming distance calculation yields a number greater than the error correction capability value, a new set of substituted binary levels is tried.

REFERENCES:
patent: 3576947 (1971-05-01), Kruger
patent: 4309771 (1982-01-01), Wilkens
patent: 4538285 (1985-08-01), Gielis

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