Optical fiber radio transmission system, transmission device, and reception device
First Claim
Patent Images
1. An optical fiber radio transmission system including a transmitting unit for converting a radio signal received via an antenna to an optical signal and sending the optical signal, and a receiving unit for receiving the optical signal sent from the transmitting unit and performing demodulation to obtain the radio signal, the transmitting unit and the receiving unit being connected to each other via an optical fiber, wherein, the transmitting unit includes:
- a received level detection section for detecting a received level of a radio signal received via an antenna;
a transmitting signal control section for, in accordance with the received level detected by the received level detection section, controlling an amplification or attenuation process performed on the radio signal received via the antenna;
a control information sending section for associating control information relating to the received level detected by the received level detection section with the radio signal subjected to control by the transmitting signal control section and sending a resulting signal; and
an electrical to optical conversion section for converting, to an optical signal, the radio signal with which the control information is associated and transmitting the optical signal to the receiving unit via the optical fiber, and the receiving unit includes;
an optical to electrical conversion section for converting the optical signal transmitted from the transmitting unit via the optical fiber to an electrical signal;
a control information extraction section for extracting, from the electrical signal obtained from conversion by the optical to electrical conversion section, the control information, which has been associated with the radio signal and sent by the transmitting unit; and
a receiving signal control section for, based on the received level obtained from the control information extracted by the control information extraction section, controlling an amplification or attenuation process performed on the electrical signal obtained from conversion by the optical to electrical conversion section so as to counteract against the process performed by the transmitting signal control section.
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Abstract
An optical fiber radio transmission system is provided which is capable of considerably improving the received dynamic range of radio signals and, in addition, is capable of optically transmitting radio signals while preventing the deterioration of transmission performance and the loss of linearity of an input signal more easily. A received level detection section 111 detects which one of predetermined levels, i.e., Level I, Level II, and Level III, the received level of a radio signal received by an antenna 400 falls under. A signal control section 112 performs an amplification/attenuation process on the radio signal in accordance with the detected level. A control information sending section 113 superimposes control information indicating the detected level on a primary signal obtained after the amplification/attenuation process. This signal is converted to an optical signal and transmitted. An optical to electrical conversion section 211 converts the optical signal received from a transmitting unit to an electrical signal. A control information extraction section 212 extracts the level from the control information, which has been superimposed on the primary signal. A signal control section 213 performs an amplification/attenuation process on the primary signal in accordance with the extracted level.
108 Citations
20 Claims
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1. An optical fiber radio transmission system including a transmitting unit for converting a radio signal received via an antenna to an optical signal and sending the optical signal, and a receiving unit for receiving the optical signal sent from the transmitting unit and performing demodulation to obtain the radio signal, the transmitting unit and the receiving unit being connected to each other via an optical fiber, wherein,
the transmitting unit includes: -
a received level detection section for detecting a received level of a radio signal received via an antenna;
a transmitting signal control section for, in accordance with the received level detected by the received level detection section, controlling an amplification or attenuation process performed on the radio signal received via the antenna;
a control information sending section for associating control information relating to the received level detected by the received level detection section with the radio signal subjected to control by the transmitting signal control section and sending a resulting signal; and
an electrical to optical conversion section for converting, to an optical signal, the radio signal with which the control information is associated and transmitting the optical signal to the receiving unit via the optical fiber, and the receiving unit includes;
an optical to electrical conversion section for converting the optical signal transmitted from the transmitting unit via the optical fiber to an electrical signal;
a control information extraction section for extracting, from the electrical signal obtained from conversion by the optical to electrical conversion section, the control information, which has been associated with the radio signal and sent by the transmitting unit; and
a receiving signal control section for, based on the received level obtained from the control information extracted by the control information extraction section, controlling an amplification or attenuation process performed on the electrical signal obtained from conversion by the optical to electrical conversion section so as to counteract against the process performed by the transmitting signal control section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A transmitting unit for converting a radio signal received via an antenna to an optical signal and sending the optical signal, the transmitting unit comprising:
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a received level detection section for detecting a received level of a radio signal received via an antenna;
a transmitting signal control section for, in accordance with the received level detected by the received level detection section, controlling an amplification or attenuation process performed on the radio signal received via the antenna;
a control information sending section for associating control information relating to the received level detected by the received level detection section with the radio signal subjected to control by the transmitting signal control section and sending a resulting signal; and
an electrical to optical conversion section for converting, to an optical signal, the radio signal with which the control information is associated and transmitting the optical signal to a receiving unit via the optical fiber.
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19. A receiving unit for receiving an optical signal sent from a transmitting unit and performing demodulation to obtain a radio signal received by the transmitting unit, the receiving unit comprising:
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an optical to electrical conversion section for converting an optical signal transmitted from the transmitting unit via an optical fiber to an electrical signal;
a control information extraction section for extracting, from the electrical signal obtained from conversion by the optical to electrical conversion section, control information relating to a received level of a radio signal, the control information having been associated with the radio signal and sent by the transmitting unit; and
a receiving signal control section for, based on the received level obtained from the control information extracted by the control information extraction section, controlling an amplification or attenuation process performed on the electrical signal obtained from conversion by the optical to electrical conversion section so as to counteract against a process performed at the transmitting unit.
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20. An optical fiber radio transmission method employed in a system including a transmitting unit for converting a radio signal received via an antenna to an optical signal and sending the optical signal, and a receiving unit for receiving the optical signal sent from the transmitting unit and performing demodulation to obtain the radio signal, the transmitting unit and the receiving unit being connected to each other via an optical fiber, wherein,
the transmitting unit includes: -
a detection step for detecting a received level of a radio signal received via an antenna;
a transmitting signal control step for, in accordance with the received level detected by the detection step, controlling an amplification or attenuation process performed on the radio signal received via the antenna;
a sending step for associating control information relating to the received level detected by the detection step with the radio signal subjected to control by the transmitting signal control step and sending a resulting signal; and
an electrical to optical conversion step for converting, to an optical signal, the radio signal with which the control information is associated and transmitting the optical signal to the receiving unit via the optical fiber, and the receiving unit includes;
an optical to electrical conversion step for converting the optical signal transmitted from the transmitting unit via the optical fiber to an electrical signal;
an extraction step for extracting, from the electrical signal obtained from conversion by the optical to electrical conversion step, the control information, which has been associated with the radio signal and sent by the transmitting unit; and
a receiving signal control step for, based on the received level obtained from the control information extracted by the extraction step, controlling an amplification or attenuation process to be performed on the electrical signal obtained from conversion by the optical to electrical conversion step so as to counteract against the process performed by the transmitting signal control step.
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Current AssigneeHiroaki Yamamoto, Kazutoshi Hase, Kuniaki Utsumi
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Original AssigneeHiroaki Yamamoto, Kazutoshi Hase, Kuniaki Utsumi
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InventorsHase, Kazutoshi, Yamamoto, Hiroaki, Utsumi, Kuniaki
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Application NumberUS10/546,618Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current385/147CPC Class CodesH03F 3/08 controlled by lightH04B 10/25759 Details of the reception of...
