Abstract: A communication signal processing method comprises obtaining transmission delay value difference data relating to a difference in transmission delay values in a communication network that varies depending on whether or not a redundant path is used, obtaining redundancy status data relating to whether the redundant path is used, and controlling a parameter of a communication signal transmitted by the communication network based on the transmission delay value difference data when the redundant path is used as a result of determination according to the redundancy status data.

Abstract: An optical communication device including a GPS receiver receiving and outputting a GPS signal from a satellite; a main controller configured to generate and output synchronization data based on the GPS signal; and an optical transceiver configured to generate an optical signal by superposing input payload data and the synchronization data, and to output the optical signal, wherein a first communication channel corresponding to the payload data and a second communication channel corresponding to the synchronization data are different communication channels. According to embodiments, GPS information for synchronization together with payload data, which is information to be transmitted, may be efficiently transmitted between optical communication devices located in remote locations without separate wavelength allocation and connection of an optical cable, by using an auxiliary management and control channel (AMCC).

Abstract: Provided is an optical transceiver including: a controller configured to output firmware update data for updating firmware of another optical transceiver connected to the optical transceiver through an optical cable; and a transmitter configured to generate an optical signal by superposing input payload data and the firmware update data, and to transmit the optical signal to the other optical transceiver. According to embodiments, the firmware of a remote optical transceiver at a remote location is automatically updated without affecting payload data, which is information to be transmitted.

Abstract: According to an aspect of the inventive concept of the disclosure, an evolved radio access network comprises: a plurality of signal sources supporting any one of heterogeneous mobile communication technology standards and data services, a hub connected to a plurality of signal sources, and a plurality of remote units connected through a hub and a transmission network.

Abstract: An optical line testing device for measuring at least a cutting position of an optical line according to the present invention includes: a first wavelength tunable laser source configured to generate a first optical signal in which a plurality of wavelengths appear alternately and periodically; a second wavelength tunable laser source configured to generate a second optical signal which is identical to the first optical signal but has an adjustable delay time; and an interferometer configured to cause interference between a reflected optical signal, corresponding to the first optical signal, which is returning after having been emitted to the optical line, and the second optical signal to output an interference signal.

Abstract: Provided are a synchronization signal detection method performed by a receiver including a processor and a memory, the synchronization signal detection method comprises calculating a PSS correlation value for a primary synchronization signal (PSS) included in a received signal, detecting a frequency offset for the PSS and a timing offset for sampling timing of the received signal and detecting the PSS based on the PSS correlation value, the frequency offset, and the timing offset.

Abstract: A method of operating a repeater comprises selecting some of adaptive filter coefficients among a plurality of adaptive filter coefficients of an adaptive filter used for interference cancellation, based on the size of a coefficient, generating a predicted interference signal using the selected adaptive filter coefficients and generating an interference-canceled communication signal from a received signal using the generated predicted interference signal.

Abstract: A method of operating a TDD-based interference cancellation repeater, the method comprises setting a compensation gain of a gain compensator differently in an uplink communication period and a downlink communication period, setting an optimal coefficient of an adaptive filter in the uplink communication period and an optimal coefficient of the adaptive filter in the downlink communication period the same, based on the set compensation gain of the gain compensator and removing an interference signal in the uplink communication period or the downlink communication period according to the set optimal coefficient of the adaptive filter.

Abstract: A base station interface module included in a distributed antenna system includes: a separator configured to separate a base station signal input from a base station and output first and second base station signals; a pre-compensator configured to compensate for at least one of an amplitude and a phase of the first base station signal based on a preset compensation value; a first attenuator configured to attenuate the compensated first base station signal and to output the attenuated first base station signal to the distributed antenna system; and a second attenuator configured to attenuate the second base station signal and to terminate the attenuated second base station signal.

Abstract: A TSN-based distributed antenna system including a headend unit, one or more TSN switches, and one or more remote units and a fronthaul transport network constituted by the headend unit, the TSN switch, and the remote unit is provided. The packet-based fronthaul network constituted by the headend unit, the TSN switch, and the remote unit transmits traffic in a time-deterministic manner while minimizing packet loss through Ethernet to which TSN standards are applied.

Abstract: The inventive concept relates to a communication device comprising a DPD processor configured to output a plurality of pre-distorted signals by pre-distorting each of a plurality of input signals using an extracted feedback signal, a first signal combiner configured to combine a plurality of feedback signals corresponding to the plurality of pre-distorted signals and output a combined feedback signal, an analog-to-digital converter configured to convert the combined feedback signal into a digital signal and output a digital-converted combined feedback signal and a signal extractor configured to extract the digital-converted combined feedback signal and output the extracted feedback signal.

Abstract: Disclosed is a distributed antenna system (DAS). The DAS includes a DAS controller, which is an OpenFlow controller, and one or more DAS units in order to dynamically control a traffic transmission policy of the DAS units using an OpenFlow protocol, wherein the DAS controller generates and changes a traffic transmission policy by reflecting a traffic transmission policy change request by operator manipulation or a software-defined network supporting application and a need for changing of the traffic transmission policy according to a status of the DAS unit and a status of a port, and the DAS unit transmits received traffic to a destination according to the policy.

Abstract: The present invention provides a distributed antenna system for automatically detecting an abnormally operating node unit. According to an embodiment of the present invention, a node unit of the distributed antenna system includes a signal input unit configured to receive and output first through n-th state information from n other node units connected to the node unit, where n is a natural number greater than or equal to 2; and a controller configured to analyze the first through n-th state information and to determine states of uplink signals respectively corresponding to the first through n-th state information. Each of the n other node units may analyze a signal received through a service antenna and generate the state information.

Abstract: A communication node processing a communication signal in a distributed antenna system comprises a data appearance frequency monitor configured to receive a communication signal including a sign bit string, a count leading zero bit string, and an additional data bit string, and to monitor data appearance frequency in the count leading zero bit string included in the received communication signal, a Huffman encoder configured to encode the count leading zero bit string into a corresponding codeword according to a Huffman encoding algorithm based on the data appearance frequency in the count leading zero bit string and an additional bit allocator configured to allocate additional bits to the additional data bit string when the number of bits in the count leading zero bit string decreases during the encoding process.

Abstract: A method of operating a repeater comprises detecting a synchronization signal from a received communication signal, identifying a time division duplex (TDD) switching pattern based on a power change of the communication signal over time and switching an uplink operation and a downlink operation of the repeater based on the detected synchronization signal and the TDD switching pattern.

Abstract: According to one or more embodiments of the present invention, a frame processing method of a distributed antenna system may include confirming whether a quality of service (QoS) tag exists in header information of a received frame; performing frame scheduling of the frame based on the QoS tag; and dropping or transmitting the frame according to a transmission priority according to a result of the frame scheduling.

Abstract: A TSN-based distributed antenna system including a headend unit, one or more TSN switches, and one or more remote units and a fronthaul transport network constituted by the headend unit, the TSN switch, and the remote unit is provided. The packet-based fronthaul network constituted by the headend unit, the TSN switch, and the remote unit transmits traffic in a time-deterministic manner while minimizing packet loss through Ethernet to which TSN standards are applied.

Abstract: A wavelength-setting auxiliary device according to an embodiment of the inventive concept includes an optical wavelength analyzer configured to transmit a test signal having a first wavelength to an optical line terminal, and to execute a central wavelength detection algorithm based on a result of detecting power of a return signal for the test signal to set optical wavelength information of a tunable optical module, and a connector connected to the tunable optical module for interfacing data transmitted between the optical wavelength analyzer and the tunable optical module.

Abstract: The present invention, which relates to a multi-path communication device for sharing a feedback path for digital pre-distortion, includes: a DPD processing unit configured to output a plurality of pre-distorted signals by respectively pre-distorting a plurality of input signals, to output an nth control signal when an nth input signal is input, and to output an nth pre-distorted signal using an nth feedback signal input in response to the nth control signal; a power amplifying unit configured to amplify each of the plurality of pre-distorted signals and output a plurality of amplified signals; a signal combining unit configured to combine some of each of the plurality of amplified signals and output combined feedback signal; and a signal selection unit configured to select and output only the nth feedback signal from the combined feedback signal according to the input nth control signal, thereby preventing an increase in the size of a device and manufacturing cost thereof caused by a plurality of DPD feedbac

Abstract: There is provided a distributed antenna system includes a plurality of head-end units configured to receive mobile communication signals from at least one base station, a hub unit connected to each of the plurality of head-end units through a first transport medium, the hub unit distributing the mobile communication signals respectively received from the plurality of head-end units to a plurality of remote units connected thereto through a second transport medium, and the plurality of remote units remotely disposed to transmit the mobile communication signals to a terminal in a service coverage, wherein the hub unit includes a signal summer configured to digitally sum sub-band signals in a same mobile communication service band based on the mobile communication signals.