Integrated demodulator, filter and decimator (DFD) for a radio receiver
US8514979B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2010 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Sep 29, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/006
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A superheterodyne receiver includes an A/D converter for converting an IF signal to a stream of samples at a sampling frequency that is four times the IF and a splitter that splits the stream of samples into a first set of even samples and a second set of odd samples. A first quadrature demodulator demodulates just the first set of even samples to produce one of real (I) and imaginary (Q) components of a complex signal at one half of the sampling frequency, and a second, parallel quadrature demodulator demodulates just the second set of odd samples to produce the other of the I and Q components. The demodulated first set is filtered using a first subset of filter coefficients, and the demodulated second set is filtered using a second subset of filter coefficients. The filter outputs correspond to a baseband complex signal. The technology disclosed reduces overall hardware complexity and operating frequency by a factor of two or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.