Subsequent frame variable data rate indication method for various variable data rate systems
US6141353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1997 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Mar 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70705
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a synchronous fixed frame boundary system with variable data rates, a transmitter inserts into a current frame an indication of the data rate of the next frame. After the first frame is received and processed at a receiver, the variable data rates of subsequent frames are known before processing, thereby reducing processing load. Furthermore, because the rate indication is inserted into the frame to be error protected along with the rest of the frame information, reliability is high, while additional data overhead and complexity are very low. For example, North American code division multiple access (CDMA) digital cellular telephone systems and personal communication system (PCS) utilize variable data rate transmissions. As a station modem (SM) assembles a current frame for convolutional encoding and further processing, the SM inserts a rate indication for the subsequent frame in accordance with information from a vocoder and CPU of the appropriate data rate for the subsequent frame. On the receiving end, rather than needing to decode multiple times to determine the appropriate data rate for every frame, the receiving SM discovers the rate of each frame by analyzing the informat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.