Maximum-ratio synthetic transmission diversity device
First Claim
1. A base station for a communications system of the Time Division Multiple Access/Time Division Duplex type for transmitting and receiving on a specified wavelength, comprising:
- a plurality of land-based antenna elements, all of which are spaced from each other at intervals greater than half of said specified wavelength;
a plurality of antenna couplers, each connected to one of said antenna elements;
a digital signal processor;
a plurality of analog to digital converters each connected to receive an analog input from of said receivers and also connected to provide a digital output to said signal processor; and
a plurality of digital to analog converters, each connected to receive a digital signal from said signal processor and each also connected to provide an analog signal output to one of said transmitters;
wherein a transmission signal to be transmitted from each of said antenna elements has a power level corresponding to the power level of the signal received by said each antenna element, wherein said transmission signal to be transmitted from said each antenna element has a phase corresponding to the phase of the signal received by said each antenna element, and wherein transmission signals transmitted from said plurality of antenna elements generate an omni-directional radiation pattern.
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Accused Products
Abstract
Antenna elements 20 are arranged at intervals “d” greater than λ/2, e.g., 5λ. A signal received by an antenna element 20 is sent by way of an antenna multiplexer 21 to a receiver 23, where the signal is demodulated. The thus-demodulated signal is sent to a phase-and-power detection section 25, where a phase and power of the signal are detected. On the basis of the result of such detection, a control section 26 calculates the phase and power of a transmission signal. On the basis of the result of the calculation, a transmission signal generation circuit 27 transmits a transmission signal to each of the antenna elements 20 by way of the antenna multiplexer 21.
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Citations
16 Claims
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1. A base station for a communications system of the Time Division Multiple Access/Time Division Duplex type for transmitting and receiving on a specified wavelength, comprising:
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a plurality of land-based antenna elements, all of which are spaced from each other at intervals greater than half of said specified wavelength;
a plurality of antenna couplers, each connected to one of said antenna elements;
a digital signal processor;
a plurality of analog to digital converters each connected to receive an analog input from of said receivers and also connected to provide a digital output to said signal processor; and
a plurality of digital to analog converters, each connected to receive a digital signal from said signal processor and each also connected to provide an analog signal output to one of said transmitters;
wherein a transmission signal to be transmitted from each of said antenna elements has a power level corresponding to the power level of the signal received by said each antenna element, wherein said transmission signal to be transmitted from said each antenna element has a phase corresponding to the phase of the signal received by said each antenna element, and wherein transmission signals transmitted from said plurality of antenna elements generate an omni-directional radiation pattern. - View Dependent Claims (2, 3, 4)
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5. A maximum-ratio synthetic diversity device comprising:
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a plurality of antenna elements transmitting and receiving at a specified wavelength, said antenna elements being spaced from each other at intervals greater than one half of said specified wavelength; and
a signal processor which detects the phase and the power of the signal received by each of said antenna elements and generates a transmission signal to be transmitted by each of said antenna elements, wherein a transmission signal to be transmitted from each of said antenna elements has a power level corresponding to a power level of the signal received by said each antenna element, wherein said transmission signal to be transmitted from said each antenna element has a phase corresponding to a phase of the signal received by said each antenna element, and wherein transmission signals transmitted from said plurality of antenna elements generate an omni-directional radiation pattern. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
a plurality of receivers, each associated with one of said antenna elements and a plurality of transmitters, each associated with one of said antenna elements. -
9. The diversity device of claim 8 wherein said signal processor is a digital circuit comprising a plurality of analog to digital converters, each connecting one of said receivers to said signal processor, and a plurality of digital to analog converters, each connecting one of said transmitters to said signal processor.
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10. The diversity device of claim 8 further comprising a plurality of antenna couplers, each of said antenna couplers being connected to one of said antenna elements and said element'"'"'s associated transmitter and receiver.
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11. The diversity device of claim 10 wherein each of said antenna couplers is a multiplexer.
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12. The diversity device of claim 10 wherein each of said antenna couplers is an electrically controlled switching device.
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13. A cellular communication system comprising the diversity device of claim 10 and further comprising at least one two-way mobile communication unit capable of receiving signals on the wavelength transmitted by said transmitters and capable of transmitting signals on the wavelength received by said receivers.
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14. The diversity device of claim 5 wherein transmissions are of the Time Division Duplex type.
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15. The diversity device of claim 5, wherein transmissions are of the Time Division Multiple Access type.
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16. The diversity device of claim 5, wherein each of said antenna elements is spaced approximately 2.5 or more wavelengths from all other antenna elements.
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Specification