Device for initializing a viterbi decoder in a receiver for signals transmitted in the form of bursts, corresponding receiver and corresponding initialization method
First Claim
1. Device for initializing a Viterbi decoder in a receiver for signals transmitted in the form of bursts, each burst comprising a synchronization word and message data that has undergone convolutional coding in a transmitter, the position of said message data relative to said synchronization word being known, said device comprising:
- means for detecting said synchronization word,multiplexing means for applying the received signals to said Viterbi decoder in the presence of said message data and for applying to said Viterbi decoder, immediately before and immediately after said message data, a code sequence generated locally, free of errors and having a length at least equal to the truncation length of said Viterbi decoder.
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Abstract
A device for initializing a Viterbi decoder in a receiver for signals transmitted in the form of bursts, each burst comprising a synchronization word and message data that has undergone convolutional coding in a transmitter, the position of the message data relative to the synchronization word being known, includes a detector for detecting the synchronization word, a multiplexer for applying the received signals to the Viterbi decoder in the presence of the message data and for applying to the Viterbi decoder, immediately before and immediately after the message data, a code sequence generated locally, free of errors and having a length at least equal to the truncation length of the Viterbi decoder.
39 Citations
12 Claims
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1. Device for initializing a Viterbi decoder in a receiver for signals transmitted in the form of bursts, each burst comprising a synchronization word and message data that has undergone convolutional coding in a transmitter, the position of said message data relative to said synchronization word being known, said device comprising:
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means for detecting said synchronization word, multiplexing means for applying the received signals to said Viterbi decoder in the presence of said message data and for applying to said Viterbi decoder, immediately before and immediately after said message data, a code sequence generated locally, free of errors and having a length at least equal to the truncation length of said Viterbi decoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Method of initializing a Viterbi decoder in a receiver for signals transmitted in the form of bursts, each burst comprising a synchronization word and message data that has undergone convolutional coding in a transmitter, the position of said message data relative to said synchronization word being known, said method consisting in:
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detecting said synchronization word, applying said received signals to said Viterbi decoder in the presence of said message data, applying to said Viterbi decoder, immediately before and immediately after said message data, a code sequence generated locally, free of errors and having a length at least equal to the truncation length of said Viterbi decoder.
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Specification