Electronics and Telecommunications Research Institute

Jung-yeol Oh

Kyeong Hwan Doo

Hwan Seok Chung

Han Hyub Lee

Kwang Ok Kim

Jae Young Kim

Hun Sik Kang

Jaehwan Kim

Hyung Soo Lee

Jae-Young Kim

Byung-Jae Kwak

Sang Rok Moon

Young Ha Lee

Min Su Kil

Provided is a coherent optical communication system including a coherent optical transmitter and a coherent optical receiver, and more particularly, when a polarization time block code is used, the complexity for performing a polarization time block decoding scheme of the coherent optical receiver is minimized.

Coherent optical communication system using polarization time block code

Provided are a method and apparatus for registering a new terminal using chromatic dispersion distance estimation. The method of registering a new terminal, performed by a transport unit (TU), includes performing frame synchronization through a downstream packet received from a transport node (TN), identifying a position of a frequency of a spectral null and a number of frequencies of spectral nulls through analysis on a frequency spectrum of the received downstream packet, estimating a transmission distance of an optical fiber to the TN, based on the identified position of the frequency of the spectral null and the identified number of frequencies of spectral nulls, and determining a timing of transmitting a registration request message, based on the estimated transmission distance, where the discovery information message is received from the TN.

Method and apparatus for registering new terminal using chromatic dispersion distance estimation

Disclosed is a method of registering a new optical network unit (ONU) to be performed by an optical line terminal (OLT). The method includes transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU, receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message, transmitting a serial number request message to a service region in which ONUs are present based on the received scheduling information, and when the serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits a serial number request message. The transmitting of the serial number request message is performed through a multi-quiet zone of a short period.

Multi-quiet zone-based optical network unit registration method for low-latency service

Disclosed are a function split structure for a mobile convergence optical transmission network and a method of providing coordinated multi-point technology using the same. The mobile convergence optical transmission network may include a centralized unit (CU), a distributed unit (DU) connected to the CU, a transport node (TN) of an optical transmission network connected to the DU via a first interface, an aggregated unit (AU) connected to a transport unit (TU) of the optical transmission network via the first interface, and a radio unit (RU) connected to the AU via a second interface corresponding to a split structure for a lower layer than the first interface.

Function split structure for mobile convergence optical transmission network and method of providing coordinated multi-point technology using the same

A method and apparatus for allocating a bandwidth based on machine learning in a passive optical network, the method including generating an inference model to predict a consumed bandwidth required for transmission by learning unstructured data of a PON including an OLT and traffic data corresponding to state information of the PON collected from the PON, predicting a consumed bandwidth with respect to a queue corresponding to a class requiring a low-latency service among classes of ONUS connected to the OLT based on the generated inference model, performing a VBA with respect to the queue corresponding to the class requiring the low-latency service based on the predicted consumed bandwidth, and performing a DBA with respect to a queue corresponding to a class not requiring the low-latency service using a transmission bandwidth which remains after the VBA is performed.

Method and apparatus for allocating bandwidth based on machine learning in passive optical network

Disclosed is a slice connection method of an optical access network and an optical access network system for slice connection. A slice connection method performed by an optical network unit (ONU) of an optical access network system may include determining a service type of a host device transmitting a service connection request, determining a slice based on the service type, sending a request for connection to the slice to an optical line terminal (OLT), and relaying data transmission and reception between the OLT and the host device when a slice connection response corresponding to the request is received from the OLT.

Slice connection method of optical access network and optical access network system for slice connection

An integrated dynamic bandwidth allocation method and apparatus in a passive optical network (PON) are provided. The bandwidth allocation method performed by an optical line terminal (OLT) includes generating a service level agreement (SLA) table including an SLA required for calculation for bandwidth allocation corresponding to at least one service queue included in at least one optical network unit (ONU) connected to the OLT, calculating maximum allocatable bandwidths for respective predetermined cycles based on the generated SLA table, and, when a service queue requiring bandwidth allocation is present in the ONU, performing bandwidth allocation according to different bandwidth allocation methods based on a priority level of the service queue using the calculated maximum allocatable bandwidths.

Integrated dynamic bandwidth allocation method and apparatus in passive optical networks

Provided is a transmitting apparatus including: a controller configured to determine a size of subchannels and a number of subchannels based on a size of entire channel band; and a DFT processor configured to spread a data symbol based on the number of the subchannels and the size of the subchannels.

Method and apparatus for transmitting of OFDM signal

A transmission apparatus according to an exemplary embodiment of the present invention comprises a serial/parallel (S/P) converter for converting an input bit stream into a plurality of symbols each including 3 bits, a differential modulator for generating differential encoded symbols by applying &#x3c0;/4 phase rotation to each of the symbols, up-samplers for up-sampling the differential encoded symbols, filters for filtering the up-sampled symbols, digital/analog (D/A) converters for converting the filtered symbols into analog signals, and a quadrature modulator for performing quadrature modulation on the converted analog signals.

Transmission apparatus, reception apparatus, transmission method, and reception method of wireless communication system

Provided are an automatic gain control (AGC) apparatus using an efficient receiving structure of an impulse signal-based ultra wideband wireless communication system, and a method thereof. An AGC apparatus of an impulse signal-based wireless communication system guarantees an SNR received through an analog circuit unit, outputs correlation values with respect to an impulse preamble of the received signal, outputs the maximum value of the correlation values for each symbol among the correlation values, or divides a symbol period into a plurality of groups and obtains average values through a sum of each group to output the maximum value thereof.

Automatic gain control apparatus and method using effective receiving structure of impulse radio ultra-wide band wireless communication system

A modulation apparatus performs modulation in which a signal wave form is positioned at the front part of an entire symbol duration or the latter part of the entire symbol duration based on a first bit of the bit information to generate a modulation symbol including a silent signal duration in which there is no signal waveform. Particularly, the method delays a signal corresponding to a quadrature-phase signal axis by a predetermined time, thereby cancelling a phase difference between symbols.

Modulation apparatus, modulation method, demodulation apparatus, and demodulation method

Provided is a carrier frequency recovering apparatus and method based on phase shift. The carrier frequency recovering apparatus can recover carrier frequency based on phase shift caused by a frequency offset to thereby perform demodulation without deterioration, no matter how large the frequency offset is, and minimize structural complexity, although a frequency offset tolerance range is higher than a symbol rate and a method thereof. The carrier frequency recovering apparatus includes a phase shift estimation part for estimating a phase shift value caused by a frequency offset based on a received preamble signal; a compensation part for compensating a receiving signal based on the estimated phase shift value obtained in the phase shift estimation part prior to differential decoding; and a detection part for detecting the compensated signal obtained in the compensation part.

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Sejong-si, South Korea

Jung-yeol Oh