Carrier recovery in re-modulation communication systems
US8406709B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2011 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | May 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/002
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication apparatus includes transmission circuitry and a frequency conversion unit. The transmission circuitry is configured to down-convert an input Intermediate Frequency (IF) signal using a transmit (TX) Local Oscillator (LO) signal so as to produce a TX baseband signal, to up-convert the TX baseband signal to produce an output Radio Frequency (RF) signal, and to send the output RF signal to an antenna. The frequency correction unit is configured to estimate a frequency of the TX baseband signal or of the input IF signal, and to adjust the TX LO signal based on the estimated frequency so as to cause the transmission circuitry to down-convert the input IF signal to a predefined target frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.