US 6,983,412 B2 | ||
Concatenation convolutional code decoder | ||
Hidenobu Fukumasa, Higashihiroshima (Japan) | ||
Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
Appl. No. 10/149,021 PCT Filed Dec. 07, 2000, PCT No. PCT/JP00/08677 § 371(c)(1), (2), (4) Date Jun. 06, 2002, PCT Pub. No. WO01/43292, PCT Pub. Date Jun. 14, 2001. |
||
Claims priority of application No. 11-348073 (JP), filed on Dec. 07, 1999. | ||
Prior Publication US 2003/0005388 A1, Jan. 02, 2003 | ||
Int. Cl. H03M 13/00 (2006.01) |
U.S. Cl. 714—755 | 14 Claims |
1. 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.
|