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    • 56. 发明申请
    • APPARATUS AND METHOD FOR REDUCING PEAK TO AVERAGE POWER RATIO IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM
    • 在正交频分复用系统中降低平均功率比的峰值的装置和方法
    • US20080298490A1
    • 2008-12-04
    • US12133108
    • 2008-06-04
    • Sung-Ryul YUNJae-Yoel KIMHak-Ju LeeHong-Sil JEONGSe-Ho MYUNG
    • Sung-Ryul YUNJae-Yoel KIMHak-Ju LeeHong-Sil JEONGSe-Ho MYUNG
    • H04L27/28
    • H04L27/2618H04L5/0048
    • 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.
    • 提供了一种在正交频分复用(OFDM)通信系统的发送装置中使用保留音降低峰均功率比(PAPR)的方法。 该方法包括在信号接收时基于预定导频模式检测子载波间隔间隔和间隔符号数,以及确定在间隔符号的数量期间通过移位分配给预定符号的保留音调的位置而获得的移位保留音的位置 间隔间隔的间隔; 使用确定的每个符号的频域保留音调的位置来确定通过旋转存储在存储器中的脉冲的复数值的相位而获得的脉冲波形; 使用相位旋转脉冲波形计算输出信号的PAPR的减数; 以及通过使用相位旋转的脉冲波形执行梯度算法来减小输入信号的PAPR。
    • 57. 发明授权
    • Apparatus and method for coding/decoding block low density parity check code in a mobile communication system
    • 在移动通信系统中对低密度奇偶校验码进行编码/解码的装置和方法
    • US07313752B2
    • 2007-12-25
    • US10926932
    • 2004-08-26
    • Gyu-Bum KyungHong-Sil JeongJae-Yoel KimSung-Eun ParkKyeong-Cheol YangSe-Ho Myung
    • Gyu-Bum KyungHong-Sil JeongJae-Yoel KimSung-Eun ParkKyeong-Cheol YangSe-Ho Myung
    • G06F11/00
    • H03M13/1105H03M13/1102H03M13/1151H03M13/1162H03M13/1171H03M13/118H03M13/1185H03M13/1188H03M13/1194
    • A method for generating a parity check matrix of a block LDPC code is disclosed. The parity check matrix includes an information part corresponding to an information word and a first parity part and a second parity part each corresponding to a parity. The method includes determining a size of the parity check matrix based on a coding rate applied when coding the information word with the block LDPC code, and a codeword length; dividing a parity check matrix with the determined size into a predetermined number of blocks; classifying the blocks into blocks corresponding to the information part, blocks corresponding to the first parity part, and blocks corresponding to the second parity part; arranging permutation matrixes in predetermined blocks from among the blocks classified as the first parity part, and arranging identity matrixes in a full lower triangular form in predetermined blocks from among the blocks classified as the second parity part; and arranging the permutation matrixes in the blocks classified as the information part such that a minimum cycle length is maximized and weight values are irregular on a factor graph of the block LDPC code.
    • 公开了一种用于生成块LDPC码的奇偶校验矩阵的方法。 奇偶校验矩阵包括对应于信息字的信息部分和对应于奇偶校验的第一奇偶校验部分和第二奇偶校验部分。 该方法包括基于在使用块LDPC码对信息字进行编码时应用的编码率和码字长度来确定奇偶校验矩阵的大小; 将具有所确定的大小的奇偶校验矩阵除以预定数量的块; 将块分类为对应于信息部分的块,对应于第一奇偶校验部分的块,以及对应于第二奇偶校验部分的块; 从分类为第一奇偶校验部分的块中将预定块中的置换矩阵排列在预定块中的整个下三角形形式中的单位矩阵,从被分类为第二奇偶校验部分的块中排列; 以及将排列矩阵排列在分组为信息部分的块中,使得最小周期长度最大化,权重值在块LDPC码的因子图上是不规则的。