Transmitter, receiver, and radio communications system and method
First Claim
Patent Images
1. A transmitter comprising:
- a mixer;
said mixer receiving a first input signal being modulated with an information signal, a second input signal being a non-modulated wave signal and an input carrier signal; and
said mixer producing a first radio frequency signal and a second radio frequency signal by mixing said first input signal and said second input signal with said input carrier signal and up-converting both of them into radio waves for transmitting by the transmitter.
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Abstract
Transmitter and receiver for wireless communications with improved accuracy and stability in radio frequency control. A transmitter mixes an information-carrying signal (first signal) and a non-modulated wave signal (second signal) with a carrier signal, thereby producing a first and second radio frequency signals for radio wave transmission. A receiver mixes those two radio frequency signals to extract the original information signal. While the received radio frequency signals contain some frequency fluctuations and phase noises that have been introduced at the sending end, such unstable components Δf will cancel out at the receiving end.
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Citations
59 Claims
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1. A transmitter comprising:
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a mixer; said mixer receiving a first input signal being modulated with an information signal, a second input signal being a non-modulated wave signal and an input carrier signal; and said mixer producing a first radio frequency signal and a second radio frequency signal by mixing said first input signal and said second input signal with said input carrier signal and up-converting both of them into radio waves for transmitting by the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A transmitter comprising:
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a mixer; said mixer receiving a first input signal being a baseband signal, a second input signal being a non-modulated wave signal and an input carrier signal; and said mixture producing a first radio frequency signal and a second radio frequency signal by mixing said first input signal and said second input signal with said input carrier signal and up-converting both of them into radio waves for transmitting.
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21. A receiver comprising:
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a receiver mixer which mixes a received first and second radio frequency signals to extract a difference frequency signal therefrom, the first and second radio frequency signals having been produced at a sending end by a transmitter having a mixer which receives a first input signal being modulated with an information signal, a second input signal being a non-modulated wave signal and an input carrier signal; and said mixer producing the first and second radio frequency signals by mixing the first input signal and the second input signal with the input carrier signal and up-converting both of them into radio waves for transmitting by the transmitter. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A radio communications system, comprising:
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a transmitter comprising a mixer, said mixer receiving a first input signal being modulated with an information signal, a second input signal being a non-modulated wave signal and an input carrier signal, and said mixer producing a first radio frequency signal and a second radio frequency signal by mixing said first input signal and said second input signal with said input carrier signal and up-converting both of them into radio waves for transmitting by the transmitter; and a receiver comprising a receiver mixer which extracts a difference frequency signal from the first and second radio frequency signals by mixing the first and second radio frequency signals that are received from said transmitter. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. A method of sending information from a transmitting end to a receiving end through a radio communication channel, comprising the steps of:
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(a) at the transmitting end, sending out a first and second radio frequency signals which are produced by mixing a first input and second input signals inputted to a mixer with a input carrier signal inputted to the mixer and up-converting both of them into radio waves, the first input signal being modulated with an information signal, the second input signal being a non-modulated wave signal; and (b) at the receiving end, extracting a difference frequency signal from the first and second radio frequency signals by mixing the first and second radio frequency signals that are received from the transmitting end. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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53. A method of sending information, comprising the step of:
transmitting a first and second radio frequency signals which are produced by mixing a first input and second input signals received in a mixer with a input carrier signal received in the mixer and up-converting both of them into radio waves, the first input signal being modulated with an information signal, the second input signal being a non-modulated wave signal. - View Dependent Claims (54, 55, 56, 57)
- 58. A method of receiving information, comprising the step of mixing a received first and second radio frequency signals to extract a difference frequency signal therefrom, the first and second radio frequency signals having been produced at a sending end by mixing a first input signal and a second input signal received in a mixer with a input carrier signal received in the mixer and up-converting both of them into radio waves, the first input signal being modulated with an information signal, the second input signal being a non-modulated wave signal.
Specification