Method and apparatus for decoding continuously coded convolutionally encoded messages
US6356595B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 10, 1998 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Jun 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0054
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A decoding method for use in a communications system employing a communication channel in which a message is convolutionally encoded by a base station encoder and transmitted to a remote terminal during a time slot allocated to at least that remote terminal. The encoder is not completely reset immediately prior to the allocated time slot such the encoder state is unknown at the onset thereof. The decoding method includes assigning a most likelihood probability for an initial encoder state as being one of a number of predetermined encoder states; and, convolutionally decoding ensuing bits of the message based on the assumption of the initial encoder state as one of the predetermined states. The method affords low error rate decoding, and allows for improved power conservation by a mobile station, since the mobile station need not awaken significantly prior to its allocated time slot. Preferably, a Viterbi decoder is used to perform the convolutional decoding. The method has particular utility when used for decoding page messages indicative of call notifications in a paging channel of a code division multiple access (CDMA) wireless telecommunications system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.