ANALOG OPTICAL REPEATER AND SINGLE OPTICAL LINE TRANSMITTING METHOD FOR MULTI-BAND MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO)
First Claim
1. A head end (HE) of an analog optical repeater configured to communicate with a base station, and to communicate with a remote unit (RU) connected to the HE through an optical cable and configured to perform wireless communication with a terminal, the HE comprising:
- a first frequency converting amplifier configured to perform amplification and frequency conversion with respect to a downstream multi-band multiple-input multiple output (MIMO);
a frequency combiner configured to combine the downstream multi-band MIMO;
a frequency divider configured to divide an upstream multi-band MIMO;
a second frequency converting amplifier configured to perform amplification and frequency conversion with respect to the upstream multi-band MIMO; and
an optical module configured to convert the downstream multi-band MIMO from the frequency combiner into [[an ]]a downstream optical signal to transmit to the RU, and to convert an upstream optical signal from the RU into the upstream multi-band MIMO to transmit to the frequency divider;
wherein a the HE is configured to perform frequency conversion to prevent overlapping of signals having the same frequencies when the downstream optical signal is transmitted through the optical cable, and to perform inverse frequency conversion on the upstream optical signal from the RU to prevent overlapping of upstream signals received by the HE with respect to the same MIMO.
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Accused Products
Abstract
A multi-band multiple-input multiple-output (MIMO) transmitting apparatus and method of using an analog optical repeater that relays a downstream signal and an upstream signal between a base station and a terminal is provided. A head end of the analog optical repeater converts a frequency of a signal through a frequency converter to prevent the signal from overlapping with other signals having the same frequencies of a downstream multi-band, and uses a band already used by an optical module, and thus does not need to secure an additional band in the optical module. Accordingly, signals at the same frequency input into the HE can be transmitted through the optical cable and to the RU without overlapping. A flow of upstream signals received from the terminal are handled and transmitted similarly to the downstream signals, but in the opposite direction, whereby multi-band MIMO is implemented.
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Citations
18 Claims
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1. A head end (HE) of an analog optical repeater configured to communicate with a base station, and to communicate with a remote unit (RU) connected to the HE through an optical cable and configured to perform wireless communication with a terminal, the HE comprising:
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a first frequency converting amplifier configured to perform amplification and frequency conversion with respect to a downstream multi-band multiple-input multiple output (MIMO); a frequency combiner configured to combine the downstream multi-band MIMO; a frequency divider configured to divide an upstream multi-band MIMO; a second frequency converting amplifier configured to perform amplification and frequency conversion with respect to the upstream multi-band MIMO; and an optical module configured to convert the downstream multi-band MIMO from the frequency combiner into [[an ]]a downstream optical signal to transmit to the RU, and to convert an upstream optical signal from the RU into the upstream multi-band MIMO to transmit to the frequency divider; wherein a the HE is configured to perform frequency conversion to prevent overlapping of signals having the same frequencies when the downstream optical signal is transmitted through the optical cable, and to perform inverse frequency conversion on the upstream optical signal from the RU to prevent overlapping of upstream signals received by the HE with respect to the same MIMO. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13)
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5. A remote unit (RU) of an analog optical repeater configured to communicate with a base station, wherein the RU is connected to a head end (HE) of the analog optical repeater through an optical cable and is configured to perform wireless communication with a terminal, the RU comprising:
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a first frequency converting amplifier configured to perform amplification and frequency conversion with respect to a downstream multi-band multiple-input multiple output (MIMO); a frequency divider configured to divide the downstream multi-band MIMO; a frequency combiner configured to combine an upstream multi-band MIMO; a second frequency converting amplifier configured to perform amplification and frequency conversion with respect to the upstream multi-band MIMO; and an optical module configured to convert the upstream multi-band MIMO from the frequency combiner into an upstream optical signal to transmit to the HE, and to convert a downstream optical signal from the HE into the downstream multi-band MIMO to transmit to the frequency divider; wherein the RU is configured to perform frequency conversion to prevent overlapping of signals having the same frequencies when the upstream optical signal is transmitted through the optical cable, and to perform inverse frequency conversion on the downstream optical signal from the HE to prevent overlapping of downstream signals received by the RU with respect to the same MIMO. - View Dependent Claims (6, 7, 8, 14, 15, 16, 17, 18)
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Specification