公开(公告)号：US07221721B2

公开(公告)日：2007-05-22

申请号：US10334938

申请日：2002-12-31

申请人： Jun-Woo Kim ,  Young-Ha Lee ,  Young-Hoon Kim ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Young-Ha Lee ,  Young-Hoon Kim ,  Youn-Ok Park

IPC分类号： H04L27/06 ,  G06F1/02 ,  G06F17/10

CPC分类号： H04L27/2657 ,  H04L27/2675 ,  H04L27/2684

摘要： A method for calculating frequency offset using arc tangent calculations according to real part and imaginary part input values received externally. The method includes converting arc tangent equations for determining frequency offset into equations to perform log calculations; calculating frequency offset using linear approximation and the converted log equations; and dividing the real part input value to bit values of a predetermined size to realize a size similar to that of the imaginary part input value if a range of the frequency offset value to be calculated is small. With the use of the method, hardware area and power consumption may be reduced, and precise frequency offset may be calculated.

摘要翻译： 根据外部接收的实部和虚部输入值，使用反正切运算计算频偏的方法。 该方法包括将用于确定频率偏移的反正切方程转换为方程以执行对数计算; 使用线性近似和转换的对数方程计算频偏; 并且如果要计算的频率偏移值的范围较小，则将实部输入值除以预定大小的位值，以实现与虚部输入值的大小相似的大小。 通过使用该方法，可以减少硬件面积和功率消耗，并且可以计算精确的频率偏移。

公开(公告)号：US20100061223A1

公开(公告)日：2010-03-11

申请号：US11721136

申请日：2005-11-10

申请人： Jun-Woo Kim ,  Su-Chang Chae ,  Young-Ha Lee ,  Eon-Young Hong ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Su-Chang Chae ,  Young-Ha Lee ,  Eon-Young Hong ,  Youn-Ok Park

IPC分类号： H04J1/00 ,  H04J11/00 ,  H04L27/28 ,  H04B15/00

CPC分类号： H04L5/0044 ,  H04L5/0048 ,  H04L5/0092

摘要： A subcarrier allocating apparatus allocating data to be transmitted to a plurality of orthogonal subcarriers in an orthogonal frequency division multiplexing (OFDM) system, the apparatus including: a logical index generator (142) generating a logical index for allocating a data subcarrier to a physical index, the logical index being included with only data subcarriers and the physical index indicating a location of a substantial subcarrier within a symbol; an intermediate index converter (144) converting the logical index into an intermediate index by performing a given operation on the generated logical index and a pilot location constant; and a physical index converter (146) converting the intermediate index into a physical index based on the number of data subcarriers on the left and right sides of a null subcarrier for insertion of a guard interval formed by the null subcarrier.

摘要翻译： 一种子载波分配装置，在正交频分复用（OFDM）系统中分配要发送到多个正交子载波的数据，该装置包括：逻辑索引发生器，产生用于将数据子载波分配到物理索引的逻辑索引 逻辑索引仅包括数据子载波，物理索引指示符号内的实质子载波的位置; 中间索引转换器（144），通过对所生成的逻辑索引和导频位置常数执行给定的操作将逻辑索引转换成中间索引; 以及物理索引转换器（146），其基于用于插入由所述无效副载波形成的保护间隔的无效副载波的左侧和右侧的数据子载波的数量将所述中间索引转换为物理索引。

公开(公告)号：US20050141474A1

公开(公告)日：2005-06-30

申请号：US10971787

申请日：2004-10-21

申请人： Young-Ha Lee ,  Jun-Woo Kim ,  Youn-Ok Park ,  Seung-Ku Hwang

发明人： Young-Ha Lee ,  Jun-Woo Kim ,  Youn-Ok Park ,  Seung-Ku Hwang

IPC分类号： H04J11/00 ,  H04J3/06 ,  H04L5/02 ,  H04L27/26

CPC分类号： H04J3/0682 ,  H04L5/023 ,  H04L27/2655

摘要： Disclosed is a ranging system and method in an OFDMA system. The ranging system includes complex exponential twiddle storage units for respectively storing complex exponential twiddle factors corresponding to a timing error, complex multipliers for respectively complex-multiplying the complex exponential twiddle factors by received uplink ranging data, code correlators for respectively correlating the outputs of the complex multipliers and ranging codes, and threshold comparators for respectively comparing the outputs of the code correlators with a threshold.

摘要翻译： 公开了OFDMA系统中的测距系统和方法。 测距系统包括用于分别存储对应于定时误差的复指数旋转因子的复指数旋转存储单元，用于分别复数乘以接收的上行测距数据的复指数旋转因子的复乘数，用于分别将复数的输出相关联的码相关器 乘法器和测距码，以及用于分别比较码相关器的输出与阈值的阈值比较器。

公开(公告)号：US08718153B2

公开(公告)日：2014-05-06

申请号：US12105172

申请日：2008-04-17

申请人： Jun-Woo Kim ,  Dae-Ho Kim ,  Young-Ha Lee ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Dae-Ho Kim ,  Young-Ha Lee ,  Youn-Ok Park

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2607 ,  H04L27/263

摘要： The present invention relates to a signal transmitting apparatus, a method thereof, and an inverse fast Fourier transform (IFFT) apparatus for a signal transmitting apparatus. A signal transmitting apparatus according to an embodiment of the present invention receives data, and performs inverse fast Fourier transform (IFFT) on the data on the basis of a twiddle factor for shifting output data by the size of a cyclic prefix. In addition, the signal transmitting apparatus sequentially stores data corresponding to the size of the cyclic prefix starting with initial data among the transformed data, and generates an OFDM symbol on the basis of the stored data and the transformed data. According to the embodiment of the present invention, it is possible to efficiently reduce a time delay and a memory use amount when a cyclic prefix is added at a transmitting end, without changing the size of hardware and power consumption.

摘要翻译： 信号发送装置及其方法技术领域本发明涉及信号发送装置及其方法以及信号发送装置的快速傅里叶逆变换（IFFT）装置。 根据本发明的实施例的信号发送装置接收数据，并且基于用于根据循环前缀的大小移位输出数据的旋转因子对数据进行快速傅立叶逆变换（IFFT）。 此外，信号发送装置顺序地存储与变换数据中的初始数据开始的循环前缀的大小相对应的数据，并且根据存储的数据和变换后的数据生成OFDM符号。 根据本发明的实施例，可以有效地减少在发送端添加循环前缀的时间延迟和存储器使用量，而不改变硬件和功耗的大小。

公开(公告)号：US08134914B2

公开(公告)日：2012-03-13

申请号：US11721136

申请日：2005-11-10

申请人： Jun-Woo Kim ,  Su-Chang Chae ,  Young-Ha Lee ,  Eon-Young Hong ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Su-Chang Chae ,  Young-Ha Lee ,  Eon-Young Hong ,  Youn-Ok Park

IPC分类号： H04J11/00

CPC分类号： H04L5/0044 ,  H04L5/0048 ,  H04L5/0092

摘要： A subcarrier allocating apparatus allocating data to be transmitted to a plurality of orthogonal subcarriers in an orthogonal frequency division multiplexing (OFDM) system is provided. The apparatus includes a logical index generator generating a logical index for allocating a data subcarrier to a physical index, the logical index being included with only data subcarriers and the physical index indicating a location of a substantial subcarrier within a symbol, an intermediate index converter converting the logical index into an intermediate index by performing a given operation on the generated logical index and a pilot location constant, and a physical index converter converting the intermediate index into a physical index based on the number of data subcarriers on the left and right sides of a null subcarrier for insertion of a guard interval formed by the null subcarrier.

摘要翻译： 提供了一种在正交频分复用（OFDM）系统中分配要发送到多个正交子载波的数据的副载波分配装置。 该装置包括逻辑索引生成器，其生成用于将数据子载波分配给物理索引的逻辑索引，所述逻辑索引仅包括数据子载波，并且所述物理索引指示符号内的实质子载波的位置，中间索引转换器转换 通过对所生成的逻辑索引和导频位置常数执行给定的操作而将中间索引的逻辑索引转换成中间索引;以及物理索引转换器，其基于左侧和右侧的数据子载波的数量将中间索引转换为物理索引 用于插入由无效副载波形成的保护间隔的无效副载波。

公开(公告)号：US08068510B2

公开(公告)日：2011-11-29

申请号：US10583167

申请日：2004-11-03

申请人： Jun-Woo Kim ,  Young-Hoon Kim ,  Su-Chang Chae ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Young-Hoon Kim ,  Su-Chang Chae ,  Youn-Ok Park

IPC分类号： H04Q11/02

CPC分类号： H04L5/023 ,  H04L1/0003 ,  H04L1/0009 ,  H04L27/2608

摘要： Disclosed is a demodulation apparatus for receiving signals by an adaptive modulation and coding method, and demodulating the signals, in an OFDMA based packet communication system, comprising: a QAM demapper for performing QAM demapping to the received signals by a modulation method using a maximum modulation ratio, until modulation methods for each of sub-channels are analyzed; a slot buffer for storing the data outputted from the QAM demapper; a channel decoder for decoding the data stored in the slot buffer and analyzing modulation methods for each sub-channels and transferring the analyzed modulation methods to the QAM demapper; and in at the same time, reading valid data from the data stored in the slot buffer, based on the analyzed modulation methods for each sub-channels, and demodulating the valid data.

摘要翻译： 公开了一种用于在基于OFDMA的分组通信系统中通过自适应调制和编码方法接收信号并解调信号的解调装置，包括：QAM解映射器，用于通过使用最大调制的调制方法对所接收的信号进行QAM解映射 比例，直到分析每个子信道的调制方法; 用于存储从QAM解映射器输出的数据的时隙缓冲器; 用于解码存储在时隙缓冲器中的数据并分析每个子信道的调制方法并将分析的调制方法传送到QAM解映射器的信道解码器; 并且同时，基于针对每个子信道的分析的调制方法和解调有效数据，从存储在时隙缓冲器中的数据读取有效数据。

公开(公告)号：US20070248002A1

公开(公告)日：2007-10-25

申请号：US10583167

申请日：2004-11-03

申请人： Jun-Woo Kim ,  Young-Hoon Kim ,  Su-Chang Chae ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Young-Hoon Kim ,  Su-Chang Chae ,  Youn-Ok Park

IPC分类号： H04J11/00

CPC分类号： H04L5/023 ,  H04L1/0003 ,  H04L1/0009 ,  H04L27/2608

摘要： Disclosed is a demodulation apparatus for receiving signals by an adaptive modulation and coding method, and demodulating the signals, in an OFDMA based packet communication system, comprising: a QAM demapper for performing QAM demapping to the received signals by a modulation method using a maximum modulation ratio, until modulation methods for each of sub-channels are analyzed; a slot buffer for storing the data outputted from the QAM demapper; a channel decoder for decoding the data stored in the slot buffer and analyzing modulation methods for each sub-channels and transferring the analyzed modulation methods to the QAM demapper; and in at the same time, reading valid data from the data stored in the slot buffer, based on the analyzed modulation methods for each sub-channels, and demodulating the valid data.

摘要翻译： 公开了一种用于在基于OFDMA的分组通信系统中通过自适应调制和编码方法接收信号并解调信号的解调装置，包括：QAM解映射器，用于通过使用最大调制的调制方法对所接收的信号进行QAM解映射 比例，直到分析每个子信道的调制方法; 用于存储从QAM解映射器输出的数据的时隙缓冲器; 用于解码存储在时隙缓冲器中的数据并分析每个子信道的调制方法并将分析的调制方法传送到QAM解映射器的信道解码器; 并且同时，基于针对每个子信道的分析的调制方法和解调有效数据，从存储在时隙缓冲器中的数据读取有效数据。

公开(公告)号：US20090225704A1

公开(公告)日：2009-09-10

申请号：US11721122

申请日：2005-12-09

申请人： Young-Ha Lee ,  Chang-Wahn Yu ,  Jun-Woo Kim ,  Youn-Ok Park

发明人： Young-Ha Lee ,  Chang-Wahn Yu ,  Jun-Woo Kim ,  Youn-Ok Park

IPC分类号： H04W72/04

CPC分类号： H04L5/0007 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/0094

摘要： A tile index generation apparatus for allocating subchannels of a control channel and a diversity channel, a subchannel allocation apparatus for allocating subchannels of a diversity channel, and a subchannel allocation apparatus for allocating subchannels of an adaptive modulation coding (AMC) channel, which are used for an uplink of an orthogonal frequency division multiplexing access (OFDMA) system, are provided. With these subchannel allocation apparatuses, optimum designs for the uplink subchannel allocation in the OFDM scheme can be provided to a modulator of a subscriber station and a demodulator of a base station, and so the uplink subchannel allocation apparatus has a simple structure and an enhanced transmission speed.

摘要翻译： 一种用于分配控制信道和分集信道的子信道的瓦片索引生成装置，用于分配分集信道的子信道的子信道分配装置和用于分配自适应调制编码（AMC）信道的子信道的子信道分配装置，其被使用 用于正交频分复用接入（OFDMA）系统的上行链路。 利用这些子信道分配装置，OFDM方式中的上行链路子信道分配的最佳设计可以提供给用户台的调制器和基站的解调器，因此上行链路子信道分配装置具有简单的结构和增强的传输 速度。

公开(公告)号：US07359366B2

公开(公告)日：2008-04-15

申请号：US10971787

申请日：2004-10-21

申请人： Young-Ha Lee ,  Jun-Woo Kim ,  Youn-Ok Park ,  Seung-Ku Hwang

发明人： Young-Ha Lee ,  Jun-Woo Kim ,  Youn-Ok Park ,  Seung-Ku Hwang

IPC分类号： H04B7/208

CPC分类号： H04J3/0682 ,  H04L5/023 ,  H04L27/2655

摘要： Disclosed is a ranging system and method in an OFDMA system. The ranging system includes complex exponential twiddle storage units for respectively storing complex exponential twiddle factors corresponding to a timing error, complex multipliers for respectively complex-multiplying the complex exponential twiddle factors by received uplink ranging data, code correlators for respectively correlating the outputs of the complex multipliers and ranging codes, and threshold comparators for respectively comparing the outputs of the code correlators with a threshold.

摘要翻译： 公开了OFDMA系统中的测距系统和方法。 测距系统包括用于分别存储对应于定时误差的复指数旋转因子的复指数旋转存储单元，用于分别复数乘以接收的上行测距数据的复指数旋转因子的复乘数，用于分别将复数的输出相关联的码相关器 乘法器和测距码，以及用于分别比较码相关器的输出与阈值的阈值比较器。

公开(公告)号：US07302022B2

公开(公告)日：2007-11-27

申请号：US10687355

申请日：2003-10-15

申请人： Jun-Woo Kim ,  Young-Ha Lee ,  Chang-Wahn Yu ,  Dae-Ho Kim ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Young-Ha Lee ,  Chang-Wahn Yu ,  Dae-Ho Kim ,  Youn-Ok Park

IPC分类号： H04L27/08

CPC分类号： H04L27/261 ,  H03G3/3089

摘要： Disclosed is an AGC (automatic gain control) device and method of an OFDM system with a DC offset compensation function, and a recording medium storing a program including the method. The AGC device calculates an energy of input signals with DC offsets as the summation of the square of the input signals, and calculates an energy of the DC offsets in the input signals as the summation of the square of the DC offsets. Pure signal energy without DC offsets is produced by subtracting the energy of the DC offsets from the energy of the calculated input signal. The energy and an AGC reference value are then compared, and feedback of a comparison result is performed.

摘要翻译： 公开了具有DC偏移补偿功能的OFDM系统的AGC（自动增益控制）装置和方法，以及存储包括该方法的程序的记录介质。 AGC装置使用DC偏移量计算输入信号的能量作为输入信号的平方的总和，并且计算输入信号中的DC偏移的能量作为DC偏移的平方的总和。 没有DC偏移的纯信号能量通过从计算的输入信号的能量中减去DC偏移的能量来产生。 然后比较能量和AGC参考值，并执行比较结果的反馈。