Surface acoustic wave unique word detector and coherent demodulator
Code correlator loop using arithmetic synthesizer
Interleaved binary coded signal translation device
Concatenated error correcting system
Synchronization of a data communication receiver with a received signal
Signal synchronization system Patent #: 4414676
ApplicationNo. 06/422465 filed on 09/23/1982
US Classes:714/755, Double encoding codes (e.g., product, concatenated)375/365, Synchronization word708/314Matched filter type
ExaminersPrimary: Atkinson, Charles E.
Attorney, Agent or Firm
International ClassesH03M 13/00 (20060101)
H03M 13/05 (20060101)
Foreign Application Priority Data1980-12-08 CA
AbstractA method and apparatus which can significantly reduce the matched filter requirements in decoding cyclic block codes, and is particularly advantageous for decoding maximal length block codes, and other cyclic block codes in which the number of codewords is ࣘ2k where k is the number of data bits encoded into each codeword. The signal containing the codeword is concatenated with itself, then the concatenated signal is applied to a matched filter to provide a peaking signal at some point in time as the concatenated signal is passed through the matched filter. The position of the peaking signal relative to a predetermined instant of time is sensed whereby the identity of the codeword (and thus data) can be determined.