Diversity receiver system used in digital communication
AssigneeKabushiki Kaisha Toshiba
InventorsKeiko Seki, Koji Ogura
Life of this patent
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Abstract
A diversity receiver system includes reception circuits connected to antennas for converting frequency of a received signal to a base band signal; a diversity branch comparison circuit for directing a base band signal to be used by comparing an intermediate frequency supplied through the reception circuit; a base band delay detection circuit for outputting a detection signal which is generated by a delay detection of the base band signal directed by the diversity branch comparison circuit; and a DPLL circuit for generating an internal clock by using the detection signal supplied from the base band delay detection circuit, thereby securing a stable reception and providing a diversity receiver system having a small circuit scale.
Claims10
A diversity receiver system for digital communication having a plurality of antennas for outputting demodulation data of a received signal selected from reception signals of the plurality of antennas, the diversity receiver system comprising:
- a plurality of reception circuits each of which is connected to corresponding one of said plurality of antennas and each of which outputs a modulation signal generated from the received signal supplied through said antenna;
- comparison means for directing one of said modulation signals, which are each outputted from one of the reception circuits, to be used as selected modulation signal;
- a selector receiving said plurality of modulation signal output by each of said reception circuits, a selector outputting one of the modulated signal as said selected modulation signal in accordance with the direction of said comparison means;
- and
- a digital phase locked loop coupled to the selector, the digital phase locked loop using said detection signal supplied from said a selector to generate an internal clock,
- wherein the internal clock generated by the digital phase locked loop is used in demodulating the detection signal.
A diversity receiver system for digital communication having a plurality of antennas for outputting demodulation data of a received signal selected from reception signals of the plurality of antennas, the diversity receiver system comprising:
- a plurality of reception circuits each of which is connected to a corresponding one of said plurality of antennas and each of which outputs a modulation signal generated from the received signal supplied through said antenna;
- comparison means for directing a selected modulation signal to be used from said modulation signals which are respectively outputted from said plurality of reception circuits;
- detection means for receiving said plurality of modulation signals, which each include an in-phase component signal and a quadrature component signal, from said plurality of reception circuits and for outputting as a detection signal said selected modulation signal selected by said comparison means;
- and
- a digital phase locked loop generating an internal clock by using said detection signal supplied from said detection means,
- wherein said detection means comprises a base band delay detection circuit including:
- delay means for delaying the in-phase component signal and the quadrature component signal of said modulation signals respectively supplied from each of said plurality of reception circuits to generate and output a delayed modulation signal that includes a delayed in-phase component signal and a delayed quadrature component signal;
- selection means for receiving said modulation signals and said delayed modulation signals and outputting any one of said modulation signals and any one of said delayed modulation signals as directed by said comparison means;
- and
- calculation means for performing a complex number calculation between the in-phase component signal and the delayed in-phase component signal and between the quadrature component signal and the delayed quadrature component signal to perform a delayed detection calculation so as to output the most sensitive modulation signal to the digital phase locked loop as the detection signal.
A diversity receiver system for digital communication for outputting demodulation data of a received signal selected from reception signals, each of the reception signals being supplied from one of a plurality of antennas that are provided for the diversity receiver system, said diversity receiver system comprising:
- a plurality of reception circuits, each reception circuit being connected to a corresponding one of the antennas and outputting a modulated signal that is generated from the received signal supplied through the antenna;
- a comparison circuit coupled to the reception circuits, the comparison circuit determining which one of the modulated signals output from the reception circuits to use as a selected modulated signal;
- a selector receiving the modulated signal output by each of the reception circuits and outputting one of the modulated signals as the selected modulated signal in accordance with the determination of the comparison circuit;
- and
- a digital phase locked loop coupled to the selector, the digital phase locked loop receiving the selected modulated signal from the selector and generating an internal clock using the selected modulated signal from the selector.
Dependencies are inferred from the claim text.