Abstract:
본 개시는 LTE(Long Term Evolution)와 같은 4G(4th generation) 통신 시스템 이후 보다 높은 데이터 전송률을 지원하기 위한 5G(5th generation) 또는 pre-5G 통신 시스템에 관련된 것이다. 통신 시스템에서 수신단의 동작 방법은, 메시지 비트들 및 제1 CRC(cyclic redundancy check) 비트들에 대응하는 부호화된 비트열을 수신하는 과정과, 상기 부호화된 비트열의 적어도 일부에 대한 트레이스백을 통해 부호어를 획득하는 과정과, 상기 획득한 부호어에 대한 CRC 부호화를 수행함으로써 제2 CRC 비트들을 생성하는 과정과, 상기 제2 CRC 비트들 중 적어도 일부에 기반하여 복호를 수행하는 과정을 포함한다.
Abstract:
PURPOSE: A method and apparatus for reducing a peak to average power ratio in an orthogonal frequency division multiplexing system using additional mapping sequences are provided to generate an alternative signal sequence by performs IFFT(inverse fast Fourier transform) of sub blocks and an additional mapping symbol sub block and then linearly coupling the sub blocks and the additional mapping symbol sub block in a time domain. CONSTITUTION: A sub block partition part(410) partitions an OFDM symbol sequence into two or more sub blocks. An additional mapping symbol sub block generating part(420) generates additional mapping symbol sub blocks which corresponds to each sub block. An IFFTpart(430) performs IFFT of sub blocks and the additional mapping symbol sub blocks. An alternative signal sequence generation part(440) generates alternative signal sequences using signal subsequences and additional mapping signal subsequences. A minimum PAPR(peak to average power ratio) selecting part(450) selects the alternative signal sequence corresponding to minimum PAPR.
Abstract:
PURPOSE: A decoding method of a product code and an apparatus thereof are provided to make decoding result of very low error rate by reducing the complexity of calculation during a process of decoding the codeword matrix of the product code. CONSTITUTION: A decoding device selects soft-decision information of a horizontal code word as one soft-decision information about a decoding-failed horizontal code word. The soft-decision information is already calculated from the channel receiving information. The decoding device extracts another soft-decision information about horizontal code words using hard decision information of horizontal code words which are successfully decoded and the soft-decision information of other horizontal code words which are decoding-failed. The decoding device re-decodes the horizontal code words by adding two soft-decision information on the horizontal code words. The decoding device eliminates the matrix corresponding to the decoding success from a second expansion parity check matrix.
Abstract:
PURPOSE: An apparatus for reducing a Peak-to-Average Power Ratio in an Orthogonal Frequency Division Multiplexing system and a method thereof are provided to create a plurality of candidate signals which has the different PAPR by applying circular shift to signals of an intermediate phase in an Inverse Fast Fourier Transform shift. CONSTITUTION: An input symbol sequence is inputted. The inputted input symbol sequence is processed to a (n-i) stage of an IFFT part(340). An intermediate OFDM signal sequence is created. The intermediate OFDM signal sequence is transmitted to IFFT blocks(341,342) of the different U. The intermediate OFDM signal sequence is rotationally transported by different movement values which is pre-set at each the IFFT block. The intermediate OFDM signal sequence is processed the IFFT to a rest n stage. A plurality of OFDM signal sequences with different PAPRs is created.