Direct conversion radio receiving system using digital signal processing for channel filtering and down conversion to base band
US6584305B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1998 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | May 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A radio receiving system includes an orthogonally-modulated waveform detection/channel filter section 4, an I signal root Nyquist filter 20, a Q signal root Nyquist filter 21, and a signal detection/demodulation section 25. The orthogonally-modulated waveform detection/channel filter section 4 further includes a first filter (a band pass filter) 2 which permits passage of only a signal at a frequency band assigned to a communications system from which the radio receiving system receives a signal; a sample-and-hold circuit 5; a Hilbert transformer 6; a first channel filter 7 through N-th channel filter 9; and a clock signal shaping/controlling section 15. The band pass filter 2 is provided with the characteristics which cancel the aperture effect due to a sampling operation, thus compensating for the aperture effect due to a sampling operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.