Title:
CONVOLUTIONAL DECODER
Document Type and Number:
Japanese Patent JP3677257
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a decoder which can be packaged with high area efficiency and little complexity at a low cost by various application including an application to utilize the code of a great restrict length in a wireless base station receiver or the like.
SOLUTION: This decoder has a branch metric calculator 88, an ACS engine 90 and a traceback unit 92. The branch metric calculator 88 computes branch metrics for transitions in a trellis representative of a convolutional code used to generate the symbols. The branch metrics are computed from an offset binary representation of the symbols using an inverse likelihood function, such that a strong match between a given received symbol and a possible codeword of the convolutional code results in a small branch metric, while a weaker match between a given received symbol and a possible codeword results in a larger branch metric. The corresponding path metrics therefore grow at a smaller rate.
Inventors:
Side Aon Mujataba
Application Number:
JP2002187012A
Publication Date:
July 27, 2005
Filing Date:
June 16, 1999
Export Citation:
Assignee:
Lucent Technologies, Inc.
International Classes:
G06F11/10; H03M13/00; H03M13/03; H03M13/23; H03M13/25; H03M13/41; H04L1/00; (IPC1-7): H03M13/41; H03M13/23
Domestic Patent References:
| JP9191258A | ||||
| JP9232973A | ||||
| JP9007304A |
Attorney, Agent or Firm:
Masao Okabe
Nobuaki Kato
Kazuo
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu
Seiichiro Takahashi
Koji Yoshizawa
Nobuaki Kato
Kazuo
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu
Seiichiro Takahashi
Koji Yoshizawa