摘要:
An apparatus and method for detecting a signal in a communication system using multiple antennas are provided. The apparatus includes an optimal orderer for determining an order of signals that are subject to detection, a controller for controlling a parallel successive interference canceller so as to successively detect the signals according to the determined signal detection order, cancel the successively detected signals from a received signal, detect the signals in reverse order of the signal detection order, and cancel the successively detected signals from the received signal, and outputting a last detected signal and the parallel successive interference canceller for successively canceling the detected signals from the received signal according to a control of the controller. Accordingly, the invention provides a signal detection apparatus and method that improve the reliability while reducing the complexity of a communication system using multiple antennas.
摘要:
An apparatus and method for retransmitting a codeword packet in a system using Hybrid Automatic Repeat reQuest (HARQ) are provided. The HARQ retransmission method includes defining multiple mother codes, and selecting one of code rates of the mother codes as an initial transmission code rate according to channel condition, determining a retransmission unit for each of codeword packets coded with code rates corresponding to the mother codes and retransmitting corresponding codeword packets in units of the determined retransmission units every time there is a retransmission request.
摘要:
An apparatus and method for transmitting/receiving a signal in a communication system are provided. The method includes inputting an information word during initial transmission and transmitting a first code word created by encoding the inputted information word based on a first coding ratio, and transmitting a portion of a second code word created by encoding the first code word based on a second coding ratio at a retransmission request. Accordingly, the apparatus and method provide for transmitting/receiving signals in a communication system in such a manner that the complexity of the communication system is reduced.
摘要:
A system and method for processing a block Low Density Parity Check (LDPC) code are provided. The system includes, a decoding apparatus for decoding a block LDPC code using a parity check matrix, the parity check matrix including an information part and a parity part, the parity part including a first section (B) including a plurality of first permutation matrices, a second section (D) including a second permutation matrix, a third section (T) including a plurality of identity matrices (I) arranged diagonally within the third section and a plurality of third permutation matrices arranged below the plurality of identity matrices, and a fourth section (E) including a fourth permutation matrix.
摘要:
An apparatus and method for allocating a data rate in a multi-antenna system are provided, wherein a noise threshold corresponding to a modulation scheme, a coding rate, or a combination of both applied to a base layer from among a plurality of layers is set as a reference noise threshold, and a data rate is allocated to an enhanced layer among the plurality of layers, based on the reference noise threshold and a use or non-use of hierarchical transmission.
摘要:
An encoding apparatus and method in a communication/broadcasting system are provided. When an encoding symbol is generated using at least one source symbol from among total source symbols to be encoded, encoding symbols are generated by using each of the total source symbols with a uniform probability before repeatedly using any of the total source symbols.
摘要:
A method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The method includes generating a plurality of column groups by grouping (categorizing) columns corresponding to an information word in a parity-check matrix of the LDPC code, and ordering the column groups; determining a range of an information word desired to be obtained by performing shortening; based on the determined range of the information word, performing column group-by-column group shortening on the column groups in order according to a predetermined shortening pattern; and LDPC encoding the shortened information word.
摘要:
A method for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix includes generating an LDPC codeword by encoding information data bits, interleaving the LDPC codeword, mapping the interleaved LDPC codeword to a modulation signal, and generating a mapped signal by mapping the LDPC codeword bits separately to a bit corresponding to a real part and a bit corresponding to an imaginary part of said modulation signal, among bits constituting the modulation signal, generating a modulation signal by high-order-modulating the mapped signal and Radio Frequency (RF)-processing the modulation signal, and transmitting the RF-processed signal via a transmission antenna.
摘要:
A method for reducing a Peak to Average Power Ratio (PAPR) using reserved tones in a transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes detecting a subcarrier spacing interval and the number of spaced symbols based on a predetermined pilot pattern upon signal reception, and determining positions of shifted reserved tones obtained by shifting positions of reserved tones allocated to a predetermined symbol during the number of the spaced symbols at intervals of the spacing interval; determining an impulse waveform obtained by rotating a phase of a complex value of an impulse stored in a memory, using the determined positions of frequency-domain reserved tones of each symbol; calculating a subtrahend for a PAPR of an output signal using the phase-rotated impulse waveform; and reducing a PAPR of an input signal by performing a gradient algorithm using the phase-rotated impulse waveform.
摘要:
A method is provided for transmitting data, which improves a diversity effect in a communication system. The method includes transmitting an information word including a codeword in a (k+s)-th frame, generating s groups based on parity bits obtained by encoding the information word, and transmitting the s groups in s frames preceding the (k+s)-th frame, in a distributed manner.