Abstract: The present disclosure in some embodiments provides a transmit data structure and a communication method using the same, which can minimize the loss of the transmit data during the transmission and reception of the transmit data by optical camera communication.

Abstract: Apparatuses and methods for encoding, transmitting, receiving and decoding signal frames are provided. A transmitting apparatus includes: a frame encoder configured to perform Reed Solomon (RS) encoding on a plurality of frames in a vertical direction, wherein the frame encoder divides the plurality of frames into a plurality of groups, performs RS encoding for each group so that parities are added after the last frame of each group, and generates the RS-encoded frames. A receiver includes: a frame decoder configured to perform RS decoding on a plurality of received frames in a vertical direction, wherein the frame decoder divides the plurality of received frames into a plurality of groups, and performs RS decoding for each group to obtain information words without the parities.

Abstract: The present disclosure in some embodiments provides a transmit data structure and a communication method using the same, which can minimize the loss of the transmit data during the transmission and reception of the transmit data by optical camera communication.

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). An apparatus and a method for performing beamforming by using an antenna array in a wireless communication system are provided. The apparatus includes at least one antenna array comprising antenna elements, a control unit configured to determine a number of beams to be formed through the at least one antenna array, and a communication unit configured to adjust paths associated with the antenna elements in order to configure as many antenna subsets as the number of the beams, and to form at least one beam through at least one antenna subset configured from the at least one antenna array.

Abstract: A transmitting apparatus, a receiving apparatus and methods of controlling these apparatuses are provided. The transmitting apparatus includes: an input processor configured to process a plurality of input streams to generate a plurality of base band frames; a bit interleaved and coded modulation (BICM) processor configured to perform forward error correction (FEC) coding, constellation mapping, and interleaving on the plurality of baseband frames; a symbol generator configured to add signaling data to the plurality of baseband frames output from the BICM processor to generate an orthogonal frequency division multiplexing (OFDM) symbol; and a transmitter configured to select at least one of a plurality of pilot patterns based on a fast Fourier transform (FFT) size and a guard interval fraction, insert a pilot in the OFDM symbol according to the selected pilot pattern, and transmit a stream including the pilot-inserted OFDM symbol.

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). An apparatus and a method for performing beamforming by using an antenna array in a wireless communication system are provided. The apparatus includes at least one antenna array comprising antenna elements, a control unit configured to determine a number of beams to be formed through the at least one antenna array, and a communication unit configured to adjust paths associated with the antenna elements in order to configure as many antenna subsets as the number of the beams, and to form at least one beam through at least one antenna subset configured from the at least one antenna array.

Abstract: A transmitter includes a frame generator which generates a plurality of frames each of which includes a preamble symbol and a data symbol, a pilot inserter which inserts a plurality of first pilots in the preamble symbol according to a predetermined first arrangement pattern and inserts a plurality of second pilots in a data symbol according to a second arrangement pattern, and a transmitting unit which transmits the plurality of frames in which the first and second pilots are inserted. Accordingly, a memory needed to store pilots may be reduced and precise synchronization may be performed based on an extended number of pilots.

Abstract: A signal transmitting apparatus, a signal receiving apparatus and methods thereof are provided. A signal transmitting apparatus which transmits a signal to realize a diversity gain together with a signal transmitted from another transmitting apparatus in a multi input single output (MISO) method includes a first transmitter configured to transmit a first signal, a second transmitter configured to transmit a second signal, and a controller configured to control the first signal and the second signal to be transmitted in a first cooperative communication method, wherein the controller controls the first signal and the second signal to be transmitted together with the signal transmitted from another transmitting apparatus in a second cooperative communication method.

Abstract: A signal transmitter and receiver are provided. The transmitter includes: a Multiple Input Multiple Output (MIMO) precoder configured to, in response to a first input signal and a second input signal, generate a first transmission signal and a second transmission signal by performing MIMO precoding by pre-phase shifting or pre-phase shifting/hopping the second input signal, and superposition encoding the first input signal and the pre-phase shifted or pre-phase shifted/hopped second input signal; and an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to OFDM modulate the first transmission signal and the second transmission signal.

Abstract: A transmitting apparatus is disclosed. The transmitting apparatus includes a preamble symbol inserter configured to insert to a frame a preamble symbol including a signaling information, a guard interval inserter configured to insert guard intervals to both ends of the preamble symbol, and a transmitter configured to transmit a frame including the preamble symbol and the guard intervals, wherein one of the guard intervals which are inserted to both ends of the preamble symbol comprises a pseudo random noise (PN) sequence and another guard interval includes one between the PN sequence and a part of the signaling information. Accordingly, no separate algorithm to estimate size of FFT of the preamble symbol and the guard interval is necessary, robust signal detection and synchronization is enabled by the PN sequence inserted to the guard interval, and compensation of interference which is generated under multipath channel environment deems to be easier.

Abstract: A transmitting apparatus is disclosed. The transmitting apparatus includes a preamble symbol inserter configured to insert to a frame a preamble symbol including a signaling information, a guard interval inserter configured to insert guard intervals to both ends of the preamble symbol, and a transmitter configured to transmit a frame including the preamble symbol and the guard intervals, wherein one of the guard intervals which are inserted to both ends of the preamble symbol comprises a pseudo random noise (PN) sequence and another guard interval includes one between the PN sequence and a part of the signaling information. Accordingly, no separate algorithm to estimate size of FFT of the preamble symbol and the guard interval is necessary, robust signal detection and synchronization is enabled by the PN sequence inserted to the guard interval, and compensation of interference which is generated under multipath channel environment deems to be easier.

Abstract: A transmitting apparatus, a receiving apparatus and methods of controlling these apparatuses are provided. The transmitting apparatus includes: an input processor configured to process a plurality of input streams to generate a plurality of base band frames; a bit interleaved and coded modulation (BICM) processor configured to perform forward error correction (FEC) coding, constellation mapping, and interleaving on the plurality of baseband frames; a symbol generator configured to add signaling data to the plurality of baseband frames output from the BICM processor to generate an orthogonal frequency division multiplexing (OFDM) symbol; and a transmitter configured to select at least one of a plurality of pilot patterns based on a fast Fourier transform (FFT) size and a guard interval fraction, insert a pilot in the OFDM symbol according to the selected pilot pattern, and transmit a stream including the pilot-inserted OFDM symbol.

Abstract: A transmitter includes a frame generator which generates a plurality of frames each of which includes a preamble symbol and a data symbol, a pilot inserter which inserts a plurality of first pilots in the preamble symbol according to a predetermined first arrangement pattern and inserts a plurality of second pilots in a data symbol according to a second arrangement pattern, and a transmitting unit which transmits the plurality of frames in which the first and second pilots are inserted. Accordingly, a memory needed to store pilots may be reduced and precise synchronization may be performed based on an extended number of pilots.

Abstract: A signal transmitter and receiver are provided. The transmitter includes: a Multiple Input Multiple Output (MIMO) precoder configured to, in response to a first input signal and a second input signal, generate a first transmission signal and a second transmission signal by performing MIMO precoding by pre-phase shifting or pre-phase shifting/hopping the second input signal, and superposition encoding the first input signal and the pre-phase shifted or pre-phase shifted/hopped second input signal; and an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to OFDM modulate the first transmission signal and the second transmission signal.

Abstract: A signal transmitting apparatus, a signal receiving apparatus and methods thereof are provided. A signal transmitting apparatus which transmits a signal to realize a diversity gain together with a signal transmitted from another transmitting apparatus in a multi input single output (MISO) method includes a first transmitter configured to transmit a first signal, a second transmitter configured to transmit a second signal, and a controller configured to control the first signal and the second signal to be transmitted in a first cooperative communication method, wherein the controller controls the first signal and the second signal to be transmitted together with the signal transmitted from another transmitting apparatus in a second cooperative communication method.

Abstract: Apparatuses and methods for encoding, transmitting, receiving and decoding signal frames are provided. A transmitting apparatus includes: a frame encoder configured to perform Reed Solomon (RS) encoding on a plurality of frames in a vertical direction, wherein the frame encoder divides the plurality of frames into a plurality of groups, performs RS encoding for each group so that parties are added after the last frame of each group, and generates the RS-encoded frames. A receiver includes: a frame decoder configured to perform RS decoding on a plurality of received frames in a vertical direction, wherein the frame decoder divides the plurality of received frames into a plurality of groups, and performs RS decoding for each group to obtain information words without the parities.

Abstract: Provided are an apparatus and method for picking up and mounting parts. The apparatus includes: a first pickup unit including a plurality of first suction nozzles which pick up parts from a first substrate by sucking the parts; a flipper comprising a rotary driving member which rotates the first pickup unit such that a surface of each of the parts sucked by the first suction nozzles faces toward one direction; and a second pickup unit including a plurality of second suction nozzles which pick up the parts sucked by the first suction nozzles of the first pickup unit rotated by the flipper by sucking the parts and mount the picked-up parts on a second substrate.

Abstract: A frequency recovery apparatus and a mobile broadcast reception system utilizing the frequency recovery apparatus are disclosed. The frequency recovery apparatus and the mobile broadcast receiver estimate a fractional frequency offset value using I and Q components of a correlation value of a guard interval and compensate for the estimated fractional frequency offset value, resulting in the implementation of correct and rapid acquisition characteristics. The feedback-structured fractional carrier recovery apparatus estimates a fractional frequency offset, and compensates for the estimated fractional frequency offset, such that it solves the problem of ambiguity which may occur in a specific position corresponding to 0.5 times a sub-carrier spacing, and the fractional frequency offset can be stably estimated or compensated for.

Abstract: Provided is a carrier recovery apparatus of an OOB QPSK receiver for an Open Cable System. The carrier recovery apparatus of the digital broadcast receiver includes a carrier recovery, an SNR calculator, a false lock generator, and an integrator. The carrier recovery receives a digital broadcast signal, multiplies the signal by a carrier frequency offset, and compensates a distorted phase before converting into a last bandwidth. The SNR calculator obtains an average in an interval determined by accumulating an inputted inter-symbol mean squared error (MSE) to calculate an SNR. The false lock detector receives the SNR calculated at the SNR calculator for its input to generate a false reset signal for preventing convergence from being performed to a false direction before converting into a last bandwidth of a lock detector. The integrator receives a false reset signal from the false lock detector, for its input to initialize a register of an integral part.

Abstract: Dislosed is a fast Fourier transform device of a wireless LAN orthogonal frequency division multiplexing (OFDM) system. The device comprises: an FFT/IFFT unit constituted with one hardware, for performing a fast Fourier transform (FFT) and an inverse fast Fourier transform (IFFT); and a control signal input unit for outputting a control signal for controlling an operation of the FFT/IFFT unit.