Ramping in multimode transmitters using primed filters
US8094755B2 · kind B2 · utility
0Cited by
6References
21Claims
0Family size
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Key dates
| Filing date | Jul 4, 2005 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Mar 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3047
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters are primed with a sequence using a parallel input mode before serially entering the information data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.