Diversity receiver
First Claim
Patent Images
1. A diversity receiver comprising:
- a plurality of first antennas having directional radiation patterns different from one another, for receiving a horizontally polarized broadcast radio signal;
a plurality of first variable gain amplifiers provided for said respective first antennas, for adjusting respective gains thereof;
a first adder for adding first reception signals having been received by said first antennas and gain-adjusted by said first variable gain amplifiers, to output the first added reception signal;
a plurality of second antennas having directional radiation patterns different from one another, arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal;
a plurality of second variable gain amplifiers provided for said respective second antennas, for adjusting respective gains thereof;
a second adder for adding second reception signals having been received by said second antennas and gain-adjusted by said second variable gain amplifiers, to output the second added reception signal;
a diversity-combining circuit for diversity-combining signals based on the first and second added reception signals, to output the diversity-combined signal; and
an antenna control unit for controlling said pluralities of first and second variable gain amplifiers.
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Abstract
A diversity receiver is provided with antennas (1a) and (1b) in a first branch and antennas (1c) and (1d) in a second branch each of which antenna gains is controlled so that the offset between the directions of directional radiation patterns for the first and second branches becomes approximately π/2. Thereby, the diversity receiver can obtain a sufficient diversity gain even when it is incorporated into an indoor television with the antennas being built thereinto in close vicinity to one another.
65 Citations
24 Claims
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1. A diversity receiver comprising:
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a plurality of first antennas having directional radiation patterns different from one another, for receiving a horizontally polarized broadcast radio signal; a plurality of first variable gain amplifiers provided for said respective first antennas, for adjusting respective gains thereof; a first adder for adding first reception signals having been received by said first antennas and gain-adjusted by said first variable gain amplifiers, to output the first added reception signal; a plurality of second antennas having directional radiation patterns different from one another, arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a plurality of second variable gain amplifiers provided for said respective second antennas, for adjusting respective gains thereof; a second adder for adding second reception signals having been received by said second antennas and gain-adjusted by said second variable gain amplifiers, to output the second added reception signal; a diversity-combining circuit for diversity-combining signals based on the first and second added reception signals, to output the diversity-combined signal; and an antenna control unit for controlling said pluralities of first and second variable gain amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 24)
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7. A diversity receiver comprising:
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a plurality of first antennas having directional radiation patterns different from one another, for receiving a horizontally polarized broadcast radio signal; a selection circuit for selecting a specific output signal from signals each inputted thereinto from said first antennas; a plurality of second antennas having directional radiation patterns different from one another, arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a plurality of variable gain amplifiers provided for said respective second antennas, for adjusting respective gains thereof; an adder for adding reception signals having been received by said second antennas and gain-adjusted by said variable gain amplifiers, to output the second added reception signal; a diversity-combining circuit for diversity-combining signals based on the specific output signal and the added signal, to output the diversity-combined signal; and an antenna control unit for controlling said variable gain amplifiers as well as said selection circuit. - View Dependent Claims (9, 10, 11)
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8. A diversity receiver comprising:
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a plurality of first antennas for receiving a horizontally polarized broadcast radio signal; a phase combiner for combining signals each inputted from said first antennas with a fixed phase, to output the plurality of phase-combined signals; a selection circuit for selecting a specific phase-combined signal from the phase-combined signals; a plurality of second antennas having directional radiation patterns different from one another, arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a plurality of variable gain amplifiers provided for said respective second antennas, for adjusting respective gains thereof; an adder for adding reception signals having been received by said second antennas and gain-adjusted by said variable gain amplifiers, to output the added reception signal; a diversity-combining circuit for diversity-combining signals based on the specific phase-combined signal and the added reception signal, to output the diversity-combined signal; and an antenna control unit for controlling said selection circuit as well as said variable gain amplifiers.
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12. A diversity receiver comprising:
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a plurality of first antennas for receiving a horizontally polarized broadcast radio signal; a first phase combiner for combining signals each inputted from said first antennas with a first fixed phase, to output the plurality of first phase-combined signals; a first selection circuit for selecting a first specific phase-combined signal from the first phase-combined signals; a plurality of second antennas arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a second phase combiner for combining signals each inputted from said second antennas with a second fixed phase, to output the plurality of second phase-combined signals; a second selection circuit for selecting a second specific phase-combined signal from the second phase-combined signals; a diversity-combining circuit for diversity-combining signals based on the first and second specific phase-combined signals, to output the diversity-combined signal; and an antenna control unit for controlling said first and second selection circuits. - View Dependent Claims (13, 14, 15)
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16. A diversity receiver comprising:
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a plurality of first antennas for receiving a horizontally polarized broadcast radio signal; a phase combiner for combining signals each inputted from said first antennas with a first fixed phase, to output the plurality of phase-combined signals; a first selection circuit for selecting a specific phase-combined signal from the phase-combined signals; a plurality of second antennas arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a second selection circuit for selecting a specific second-antenna output signal, from signals each inputted thereinto from said second antennas; a diversity-combining circuit for diversity-combining signals based on the specific phase-combined signal and the specific second-antenna output signal, to output the diversity-combined signal; and an antenna control unit for controlling said first and second selection circuits. - View Dependent Claims (17, 18, 19)
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20. A diversity receiver comprising:
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a plurality of first antennas for receiving a horizontally polarized broadcast radio signal; a first selection circuit for selecting a specific first-antenna output signal, from signals inputted thereinto from said first antennas; a plurality of second antennas arranged in positions different from those of said first antennas, for receiving the horizontally polarized broadcast radio signal; a second selection circuit for selecting a specific second-antenna output signal, from signals inputted thereinto from said second antennas; a diversity-combining circuit for diversity-combining signals based on the specific first-antenna output signal and the specific second-antenna output signal, to output the diversity-combined signal; and an antenna control unit for controlling said first and second selection circuits. - View Dependent Claims (21, 22, 23)
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Specification