Baseband estimator for estimating the amplitude/frequency characteristic of a multiphase signal
US5677932A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An estimator for estimating the amplitude/frequency characteristic of a source signal from which baseband components i and q which are applied to the inputs of said estimator are derived by demodulation using two signals having orthogonal phases. The estimator includes a combiner for generating complex components i+j.multidot.q and q+j.multidot.i from the components i and q and evaluates the relative amplitudes of the complex components in order to produce a coefficient representative of the amplitude/frequency characteristic of the source signal. The invention can be used to implement a frequency equalizer whose estimator operates in the baseband, the estimator possibly driving a transversal filter operating at the intermediate frequency or at the microwave frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.