Abstract: According to an aspect of the inventive concept, there is provided an apparatus for processing an output signal of an analog-digital converter, includes: a first frequency conversion unit for converting a frequency of the output signal of the analog-digital converter so that a band where spurious components exist moves to a band where direct current components exist in the output signal of the analog-digital converter; a spurious component blocking unit for eliminating, from an output signal of the first frequency conversion unit, spurious components which have moved to the band where direct current components exist; and a second frequency conversion unit for restoring a frequency of an output signal of the spurious component blocking unit to the original frequency of the output signal of the analog-digital converter.

Abstract: Disclosed is an optical network system including a upper network equipment, a lower network equipment, and a plurality of transfer network equipments connecting the upper network equipment and the lower network equipment through independent optical links, wherein the lower network equipment performs switching such that transmission and reception of an optical signal are performed through an optical link of a standby line when a failure occurs in at least one of an optical link used as a working line, an optical interface device associated with the working line in the upper network equipment, and a transfer network equipment associated with the working line.

Abstract: A communication device for power saving and a method for controlling power thereof are provided. The communication device includes a power amplifying unit and a control unit. The power amplifying unit generates an output signal obtained by amplifying a downlink signal, using a supply voltage, and outputs the output signal. The control unit determines a current state by comparing predetermined downlink reference information with output signal information on the output signal, and, if the current state is an active state as a comparison result, controls the supply voltage to correspond to the output signal information. Accordingly, power for amplifying a signal can be controlled according to communication traffic, thereby preventing consumption of unnecessary power.

Abstract: An interference cancellation repeater includes: a first transmission/reception processing unit configured to convert a radio frequency (RF) input signal input via a link antenna communicatively coupled to a base station into a digital input signal; an interference canceller configured to cancel an interference signal from the digital input signal and to output an interference canceled signal; a second transmission/reception processing unit configured to convert the interference canceled signal into an RF output signal and to amplify the RF output signal; and a gain controller configured to detect a gain change of the interference cancellation repeater based on the interference canceled signal and to change a current gain of the interference cancellation repeater to a target gain by adjusting intensity of at least one of the RF input signal, the interference canceled signal, and the RF output signal when the gain change of the interference cancellation repeater is detected.

Abstract: According to one mode of the inventive concept, an amplification device includes a first amplifier configured to amplify an input multi-band signal to a first level, a separating unit configured to separate the multi-band signal having the first level into a first band signal and a second band signal, and a second amplifier configured to amplify the second band signal to a second level.

Abstract: Provided is a node unit which is branch-connected to another communication node via a transport medium, the node unit comprising: a delay measurement unit which transmits a test signal for measuring a delay to an adjacent node unit of the branch-connected upper stage via the transport medium and detects a loopback signal to which the test signal is looped back via the adjacent node unit of the upper stage, thereby measuring an upper stage transmission delay between the adjacent node unit of the upper stage and the node unit; a delay summation unit which, when an adjacent node unit of the branch-connected lower stage exists, receives a lower stage transmission delay transmitted from the adjacent node unit of the lower stage, and calculates a summed transmission delay by summing the upper stage transmission delay and the lower stage transmission delay; and a control unit which transmits the summed transmission delay to the adjacent node unit of the upper stage.

Abstract: According to an aspect of the inventive concept, there is provided a signal processing method performed in a distributed antenna system, includes extracting at least a part of sample data corresponding to an occupied frequency band from a digitized analog RF signal; and combining the extracted sample data.

Abstract: A base station signal matching device is a base station signal matching device mounted in a distributed antenna system for amplifying a received base station signal and transmitting the amplified base station signal to a user terminal. The base station signal matching device includes a first unit for generating first and second branch base station signals by using a power division function based on the base station signal, and transmitting the second branch base station signal to a third unit, and a second unit for matching the first branch base station signal to be suitable for signal processing of the distributed antenna system.

Abstract: A signal processing device according to an exemplary embodiment of the inventive concept can integrate a power amplifier, a duplexer, and a linearizer as a module to improve the convenience of management and to improve flexibility and extensibility so as to be transformable corresponding to a change in system development concept.

Abstract: A wideband highly linear amplifier includes a plurality of pre-distortion units for respectively linearizing digital signals of a plurality of bands, a synthesis unit for synthesizing output signals of the pre-distortion units, a single amplifier for amplifying signals outputted from the synthesis unit, distribution units for respectively separating the signals for each of the plurality of bands from the output signals of the amplifier, a plurality of inverse compensation attenuators for respectively attenuating the separated signals for each of the plurality of bands, and a feedback path for respectively feeding the attenuated signals for each of the plurality of bands back into the pre-distortion unit of the corresponding band out of the plurality of the pre-distortion units.

Abstract: An interference cancellation repeater for canceling an interference signal included in an input signal including a first adaptive filter configured to generate a first estimated signal; a second adaptive filter configured to generate a second estimated signal; a first scaler configured to scale the first estimated signal based on a first scale factor determined according to a channel state; a second scaler configured to scale the second estimated signal based on a second scale factor determined according to the channel state; a first canceller configured to generate a first interference canceled signal based on the input signal and the scaled first estimated signal; and a second canceller configured to generate a second interference canceled signal based on the first interference canceled signal and the scaled second estimated signal.

Abstract: According to an aspect of the inventive concept, there is provided a headend apparatus, including: a spectrum analysis unit analyzing frequency spectrums of a plurality of base station signals to detect characteristic information of the plurality of base station signals; a control unit transmitting the characteristic information to a network management server connected to the headend apparatus and outputting power control information, generated based on the characteristic information, received from the network management server; and a plurality of RF units receiving at least one of the plurality of base station signals and controlling power of the plurality of base station signals based on the power control information and outputting the plurality of base station signals.

Abstract: The present invention relates to a communication module assembly. The present invention is a communication module assembly which is electrically connected to a communication device and is supplied with power and signal, and can include a connection port unit that is supplied with the power and the signal from the communication device; a cable connection portion which is provided in the connection port unit, and to which cables electrically connected to the communication device is connected; a plurality of communication modules that is stacked on and connected to the connection port unit in a plug-in type; and a guide means for guiding the communication module such that the communication modules are connected to the connection port unit in a central direction.

Abstract: A base station signal matching device is a base station signal matching device mounted in a distributed antenna system for amplifying a received base station signal and transmitting the amplified base station signal to a user terminal. The base station signal matching device includes a first unit for generating first and second branch base station signals by using a power division function based on the base station signal, and transmitting the second branch base station signal to a third unit, and a second unit for matching the first branch base station signal to be suitable for signal processing of the distributed antenna system.

Abstract: According to an example embodiment of the inventive concept, a master unit for time division duplex includes a passive signal distributor for outputting, to a second node, a downlink signal input through a first node, and outputting, to the first node, an uplink signal input through a third node, and a signal transceiver for transmitting, to a remote unit, the downlink signal input from the second node, and outputting, to the third node, an uplink amplification signal received from the remote unit.

Abstract: A base station signal matching device configured to receive a base station signal from a base transceiver station (BTS), the base station signal matching device is embedded in a relay device, and the base station signal matching device includes a signal attenuation unit configured to receive the base station signal and attenuate the input power level of the base station signal; and a signal matching unit configured to receive the base station signal passing through the signal attenuation unit to match the base station signal suitable for signal processing of the relay device.

Abstract: A base station system includes a main conversion unit configured to receive a first downlink frame conforming to a first protocol and a second downlink frame conforming to a second protocol, and configured to reconstruct the first and second downlink frames to conform to a third protocol and generate a downlink transmit frame; and a radio unit including a remote conversion unit that receives the downlink transmission frame and disassembles the received downlink transmission frame to output at least one of the first and second downlink frames.

Abstract: A remote device of an optical relay system includes first and second remote driving units each extracting transmission signals of different frequency bands from downlink Radio Frequency (RF) signals provided from an optical conversion unit and outputting the transmission signals; and a downlink path control unit receiving the downlink RF signals from the optical conversion unit and transmitting the downlink RF signals to the second remote driving unit through the first remote driving unit, or transmitting the downlink RF signals to the second remote driving unit by bypassing the first remote driving unit.

Abstract: The present invention relates to a coaxial connector. According to the present invention, there is provided a coaxial connector which is installed for electrical connection of a communication module, and includes a first connector in which an insulator through which a conductor penetrates is installed inside a first housing, and a conductive gasket is seated between the first housing and the insulator; and a second connector which is coupled so that a front end comes into close contact with the conductive gasket.

Abstract: A remote apparatus includes: a plurality of sub amplification units amplifying radio frequency (RF) signals of different frequency bands, respectively; a test signal generation unit generating test signals of a frequency band for any one sub amplification unit among the plurality of sub amplification units; a conversion unit converting intermodulation (IM) signals generated in response to the test signals into a plurality of conversion IM signals by using a conversion signal of which a frequency is swept; and a control unit determining a degree of an intermodulation distortion by the any one sub amplification unit based on signal levels of the plurality of the conversion IM signals.