Method of encoding bits in a signal

H - Electricity – 03 – M

Patent

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H03M 13/00 (2006.01) G06F 1/00 (2006.01) G06K 9/00 (2006.01) G06T 1/00 (2006.01) H03M 13/15 (2006.01) H03M 13/19 (2006.01) H03M 13/23 (2006.01) H04B 14/04 (2006.01) H04K 1/00 (2006.01) H04L 7/00 (2006.01) H04L 9/00 (2006.01) H04L 25/34 (2006.01) H04N 1/32 (2006.01) H04N 1/387 (2006.01)

Patent

CA 2336099

A message in the form of a sequence of bits is encoded into non-binary signals. The encoder (401) encodes the message into a vector as the first half of the eventual encoded vector, and append the negation of the encoded vector to the encoded vector as the second half to obtain the full-length encoded vector. An identical synchronization signal (405) is added to both halves of the encoded signal. During decoding, the decoder (501) first obtains the synchronization signal by adding the two halves of the vector to find the original cyclical shift of the vector. Afterwards, the decoder decodes the vector into a bit sequence by taking the difference of the two halves of the full-length encoded vector. Finally, the encoder re-encodes the bit sequence and compares the resulting vector with the original vector to determine whether the original vector truly encoded or was simply a noise signal.

Un message se présentant sous la forme d'une séquence de bits est codé en signaux non binaires. Le codeur (401) code le message en un vecteur constituant la première moitié du vecteur codé final, et il appose la négation du vecteur codé au vecteur codé constituant la seconde moitié pour obtenir le vecteur codé de longueur totale. Un signal de synchronisation identique (405) est ajouté aux deux moitiés du signal codé. Pendant le décodage, le décodeur (501) tout d'abord obtient le signal de synchronisation par addition des deux moitiés du vecteur pour trouver le décalage cyclique original du vecteur. Ensuite, le décodeur décode le vecteur en une séquence de bits en prenant la différence des deux moitiés du vecteur codé de longueur totale. Enfin, le codeur recode la séquence de bits et compare le vecteur obtenu au vecteur original pour déterminer si le vecteur original a vraiment codé ou était un signal de bruit.

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