Rate detection in direct sequence code division multiple access systems
US6463097B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1999 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0068
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of rate detection at a receiving end of a code division multiple access (CDMA) system, in which system the effective data rate is variably selected at the transmitting end from an applicable rate set including a full rate and lower rates, each lower rate being the full rate divided by a different integer, and encoded symbols are repeated for the lower rates to maintain a constant apparent bit or symbol transmission rate. The data rate is first determined by a coarse decision method employing symbol repetition characteristics before any Viterbi decoding of the data, the data is de-punctured and de-repeated where required, and first Viterbi decoded at the first determined data rate, and data available from or after the first Viterbi decoding is evaluated to determine whether to select the data rate as equal to the first determined data rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.