Distributed multi-drop base station/repeating unit using extension of analog optical transmission in mobile communication system
First Claim
1. A distributed multi-drop base station unit using an extension of analog optical transmission in a mobile communication system, comprising:
- a main unit for performing functions of a mobile communication base station, the functions including a function of converting an analog radio frequency (RF) signal into an optical signal and transmitting the converted optical signal, a function of receiving an optical signal and converting the received optical signal into an analog RF signal, a modulation/demodulation function, an intermediate frequency (IF)/RF conversion function, and an encoding/decoding function; and
a plurality of remote units cascaded to the main unit on a sector basis, each of the remote units being adapted to, in a forward mode, receive a first optical signal, perform a first photoelectric conversion operation for the first optical signal to create a first electrical RF signal, split the first electrical RF signal into a second electrical RF signal and a third electrical RF signal, amplify the second electrical RF signal, perform a first electrophotic conversion operation for the amplified second electrical RF signal to create a second optical signal, transmit the second optical signal, amplify the third electrical RF signal and transmit the amplified third electrical RF signal to an associated terminal, and to, in a backward mode, receive a third optical signal, perform a second photoelectric conversion operation for the third optical signal to create a fourth electrical RF signal, amplify the fourth electrical RF signal, receive a fifth electrical RF signal from the associated terminal, couple the amplified fourth electrical RF signal with the fifth electrical RF signal to create a coupled electrical RF signal, perform a second electrophotic conversion operation for the coupled electrical RF signal to create a fourth optical signal, and transmit the fourth optical signal.
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Accused Products
Abstract
A distributed multi-drop base station/repeating unit using an extension of analog optical transmission in a mobile communication system. The base station unit comprises a main unit for performing functions of a mobile communication base station, and a plurality of remote units cascaded to the main unit on a sector basis. Each of the remote units is adapted to, in a forward mode, receive an analog optical signal, perform a photoelectric conversion operation for the received analog optical signal, split the resulting electrical RF signal into electrical RF signals of two paths, amplify the electrical RF signal of one of the two paths, perform an electrophotic conversion operation for the amplified electrical RF signal, transmit the resulting optical signal, amplify the electrical RF signal of the other path and transmit the amplified electrical RF signal to an associated terminal, and to, in a backward mode, receive an analog optical signal, perform the photoelectric conversion operation for the received analog optical signal, amplify the resulting electrical RF signal, couple the amplified electrical RF signal with its own electrical RF signal, perform the electrophotic conversion operation for the coupled result and transmit the resulting optical signal.
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Citations
18 Claims
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1. A distributed multi-drop base station unit using an extension of analog optical transmission in a mobile communication system, comprising:
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a main unit for performing functions of a mobile communication base station, the functions including a function of converting an analog radio frequency (RF) signal into an optical signal and transmitting the converted optical signal, a function of receiving an optical signal and converting the received optical signal into an analog RF signal, a modulation/demodulation function, an intermediate frequency (IF)/RF conversion function, and an encoding/decoding function; and a plurality of remote units cascaded to the main unit on a sector basis, each of the remote units being adapted to, in a forward mode, receive a first optical signal, perform a first photoelectric conversion operation for the first optical signal to create a first electrical RF signal, split the first electrical RF signal into a second electrical RF signal and a third electrical RF signal, amplify the second electrical RF signal, perform a first electrophotic conversion operation for the amplified second electrical RF signal to create a second optical signal, transmit the second optical signal, amplify the third electrical RF signal and transmit the amplified third electrical RF signal to an associated terminal, and to, in a backward mode, receive a third optical signal, perform a second photoelectric conversion operation for the third optical signal to create a fourth electrical RF signal, amplify the fourth electrical RF signal, receive a fifth electrical RF signal from the associated terminal, couple the amplified fourth electrical RF signal with the fifth electrical RF signal to create a coupled electrical RF signal, perform a second electrophotic conversion operation for the coupled electrical RF signal to create a fourth optical signal, and transmit the fourth optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multi-drop repeating unit using an extension of optical transmission in a mobile communication system, comprising:
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a main unit for performing functions of a mobile communication base station, the functions including a function of converting RF signal into optical signal and transmitting the converted optical signal, a function of receiving optical signal and converting the received optical signal into an analog RF signal, a modulation/demodulation function, an IF/RF conversion function, and an encoding/decoding function; and a plurality of repeaters cascaded to the main unit on a sector basis, each of the repeaters being adapted to, in a forward mode, receive a first optical signal, perform a first photoelectric conversion operation for the first optical signal to create a first electrical RF signal, split the first electrical RF signal into a second electrical RF signal and a third electrical RF signal, amplify the second electrical RF signal, perform a first electrophotic conversion operation for the amplified second electrical RF signal to create a second optical signal, transmit the second optical signal, amplify the third electrical RF signal and transmit the amplified third electrical RF signal to associated terminal, and to, in a backward mode, receive a third optical signal, perform a second photoelectric conversion operation for the third optical signal to create a fourth electrical RF signal, amplify the fourth electrical RF signal, receive a fifth electrical RF signal from the associated terminal, couple the amplified fourth electrical RF signal with the fifth electrical RF signal create a coupled electrical RF signal, perform a second electrophotic conversion operation for the coupled electrical RF signal to create a fourth optical signal, and transmit the fourth optical signal. - View Dependent Claims (11, 12, 13, 15, 16, 17, 18)
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14. The multi-drop repeating unit as set forth in 12, wherein the backward optical extension module includes:
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a second photoelectric converter for receiving the third optical signal from the next repeater and converting the third optical signal into the fourth electrical RF signal; a second amplifier for receiving the fourth electrical RF signal from the second photoelectric converter and amplifying the fourth electrical RF signal by a predetermined gain; a second coupler for coupling the amplified fourth electrical RF signal from the second amplifier with the fifth electrical RF signal from the RF transmission/reception module; and a second electrophotic converter for receiving the coupled electrical RF signal from the second coupler, converting the coupled electrical RF signal into the fourth optical signal and transmitting the fourth optical signal to the main unit or previous repeater.
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Specification