Fast forward link power control in a code division multiple access system
US6154659A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/225
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The radiotelephone demodulates the information received from the base station. The symbol-energy-to-noise-density (E.sub.s /N.sub.o) is estimated over a specified duration. This estimate is compared to a target E.sub.s /N.sub.o value. The target is updated periodically in order to maintain the quality of service. If the measured E.sub.s /N.sub.o is greater than the target, the radiotelephone sends a power down command over a reverse power control signaling channel to the base station. If the measured E.sub.s /N.sub.o is less than the target, the radiotelephone sends a power up command to the base station over the same channel. A multi-carrier transceiver system for a code division multiple access system includes circuitry for up-converting processed user data to a plurality of frequency channels. The transceiver, in some embodiments, further includes a plurality of antennas for transmitting each channel of user data. A method of using the multi-carrier system includes processing user data, and then transmitting the data at different frequency channels, and when necessary, transmitting the data through different antennas separated in space and/or having orthogonal polarization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.