Patent ID: 6983412

Claim:
A concatenated convolutional code decoder in a receiving device which receives transmitted signals of encoded signals, which each have been produced by convolutionally encoding an information signal using a concatenated convolutional encoder having a first convolutional encoder and second convolutional encoder for implementing conventional encoding, connected in parallel or in series with an interleaver interposed therebetween for rearranging input data based on a predetermined rule, the concatenated convolutional code decoder comprising: a plurality of decoding and encoding portions, each having (i) a soft-decision decoding portion for implementing a soft-decision decoding process which decodes a received signal using a likelihood information for decoding produced by a previous soft-decision decoding process and outputs a decoded signal and a likelihood information for decoding of the decoded signal, (ii) a concatenated convolutional encoding portion for subjecting the decoded signal at the soft-decision decoding portion to the same convolutional encoding process as that of the concatenated convolutional encoder to produce a replica of a transmitted encoded signal, and (iii) a transmitted signal replicating portion for producing a replica of a transmitted signal from the replica of the encoded signal produced at the concatenated convolutional encoding portion; and an interference canceler for removing from the received signal an interference signal which is determined by the transmitted signal replicating portion, based on a replica of a transmitted signal from a transmitting station from which no reception is wanted.