Method of blindly detecting a transport format of an incident convolutional encoded signal, and corresponding convolutional code decoder
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United States of America Patent
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Issued Date -
Apr 28, 2005
app pub date -
Apr 22, 2004
filing date -
Apr 23, 2003
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Abandoned
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Abstract
A method for blindly detecting a transport format of a convolutional encoded signal is provided. The transport format is unknown and belongs to a set of MF predetermined reference transport formats. The method includes decoding the convolutional encoded signal using a Maximum-a-Posteriori algorithm. The decoding includes considering the MF possible reference transport formats and delivering MF corresponding groups of soft output information, calculating from each group of soft output information a calculated cyclic redundancy check (CRC) word, and comparing the calculated CRC word with the transmitted CRC word. Groups are selected which the calculated CRC word is equal to the transmitted CRC word, and an actual transport format of the convolutional encoded signal is selected from at least one soft output information among last ones of each selected group.
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