High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation
US6823178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2001 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Oct 20, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/525
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase-Frequency Shift Keyed (CP-FSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Oscillator (VCO) operating in a microwave radio band. The VCO is deviated over a narrow frequency range that is reduced by a predetermined factor. The output of the VCO is then frequency multiplied by the predetermined factor to produce the modulated microwave output signal at the desired band. The deviation frequency of the VCO is thus chosen to be the reciprocal of the multiplication factor times the transport bit rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.