Title:
DIGITAL MODULATOR
Document Type and Number:
WIPO Patent Application WO2003069772
Kind Code:
A3
Abstract:
A circuit and a method for converting base-band modulated in-phase and quadrate signals to an intermediate frequency centered real signal by: - dispersing spectra; - frequency up-shifting the dispersed spectra; and - mirroring the up-shifted dispersed spectra. The invention further relates to a circuit and a method for converting an intermediate frequency centered real signal to base-band modulated in-phase and quadrate signals by: - splitting spectra into real and imaginary parts; - frequency down-shifting the spectra; and - compressing the downshifted spectra. The invention further relates to an apparatus comprising the above-described circuits, and a computer readable medium hereto. The basic idea is to combine complex in-phase and quadrate signals into a real signal before the up-mixing process takes place in a transmitter by use of a signal combining circuit. Similar the basic idea is to split a real signal into complex in-phase and quadrate signals after the down-mixing process has taken place in a receiver by use of a signal splitting circuit.
Inventors:
GUMIERO LUCA (NL)
Application Number:
PCT/IB2003/000197
Publication Date:
May 13, 2004
Filing Date:
January 23, 2003
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
GUMIERO LUCA (NL)
GUMIERO LUCA (NL)
International Classes:
H03C3/40; H04L27/26; (IPC1-7): H03C3/40; H04L27/36
Domestic Patent References:
| WO1998020657A1 | 1998-05-14 |
Foreign References:
| US6317468B1 | 2001-11-13 | |||
| US6144712A | 2000-11-07 | |||
| US6052701A | 2000-04-18 | |||
| US5764113A | 1998-06-09 | |||
| EP0999645A1 | 2000-05-10 |
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