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：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。

公开(公告)号：US08040980B2

公开(公告)日：2011-10-18

申请号：US12142600

申请日：2008-06-19

申请人： Seung Jae Bahng ,  Chang Wahn Yu ,  Young Jo Bang ,  Dae Ho Kim ,  Young Ha Lee ,  Youn-Ok Park

发明人： Seung Jae Bahng ,  Chang Wahn Yu ,  Young Jo Bang ,  Dae Ho Kim ,  Young Ha Lee ,  Youn-Ok Park

IPC分类号： H04L27/06 ,  H03K9/00 ,  H04L27/00

CPC分类号： H04L25/03318 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/067

摘要： The present invention relates to a log-likelihood ratio calculation method, a transmitting signal detection method, and a receiver. The present invention estimates a channel on the basis of the received signal and rearranges a plurality of layers. Further, at the time of rearrangement of the layers, a symbol of a layer having the lowest reliability is considered for every constellation dot, and the successive interference for the remaining layers is removed corresponding to the constellation dots of the layer having the lowest reliability to set the transmitting symbol candidate vector. Furthermore, a log-likelihood ratio for every bit of the plurality of layers is calculated using the transmitting symbol candidate vector to decode the channel.

摘要翻译： 本发明涉及对数似然比计算方法，发送信号检测方法和接收机。 本发明基于接收到的信号来估计信道并重排多个层。 此外，在层的重排时，对于每个星座点考虑具有最低可靠性的层的符号，并且对应于具有最低可靠性的层的星座点去除对剩余层的连续干扰， 设置发送符号候选向量。 此外，使用发送符号候选向量计算多个层中的每一比特的对数似然比，以解码该信道。

公开(公告)号：US20070248197A1

公开(公告)日：2007-10-25

申请号：US10583164

申请日：2004-12-17

申请人： Yong-Su Lee ,  Youn-Ok Park ,  Jun-Woo Kim ,  Dae-Ho Kim

发明人： Yong-Su Lee ,  Youn-Ok Park ,  Jun-Woo Kim ,  Dae-Ho Kim

IPC分类号： H04L27/08

CPC分类号： H03G3/3089 ,  H04L25/061 ,  H04L27/2647

摘要： Disclosed is an automatic gain control device in an orthogonal frequency division multiplexing system. A variable gain amplifier controls a gain of an input signal; an energy calculator calculates an energy of the input signal; a truncator accumulates the calculated energies, finds an average thereof, and generates a DC offset of the input signal; a subtracter subtracts a predefined reference value from the DC offset, and outputs a signal; and an RC filter feeds the value output by the subtracter back to the variable gain amplifier so that the value output by the subtracter may be used for an automatic gain control. The predefined reference value given to be 4.Ov is a reference power generated based on a saturation to RMS ratio for minimizing the bit error rate of the orthogonal frequency division multiplexing system.

摘要翻译： 公开了一种正交频分复用系统中的自动增益控制装置。 可变增益放大器控制输入信号的增益; 能量计算器计算输入信号的能量; 截断器累积计算出的能量，找到其平均值，并产生输入信号的DC偏移; 减法器从DC偏移中减去预定义的参考值，并输出信号; 并且RC滤波器将减法器输出的值馈送到可变增益放大器，使得减法器输出的值可用于自动增益控制。 给定为4.0V的预定义参考值是基于用于使正交频分复用系统的误码率最小化的饱和度与RMS比率产生的参考功率。

公开(公告)号：US08036322B2

公开(公告)日：2011-10-11

申请号：US12141382

申请日：2008-06-18

申请人： Seung Jae Bahng ,  Jae Kwon Kim ,  Hoon Heo ,  Hyun Myung Wu ,  Youn-Ok Park ,  Dae Ho Kim ,  Kyung Yeol Sohn ,  Chang Wahn Yu ,  Jun-Woo Kim ,  Eon Young Hong

发明人： Seung Jae Bahng ,  Jae Kwon Kim ,  Hoon Heo ,  Hyun Myung Wu ,  Youn-Ok Park ,  Dae Ho Kim ,  Kyung Yeol Sohn ,  Chang Wahn Yu ,  Jun-Woo Kim ,  Eon Young Hong

IPC分类号： H04L27/06

CPC分类号： H04L1/0054

摘要： The present invention relates to a method of calculating a log-likelihood ratio and a method of detecting a transmission signal. According to the present invention, when a transmission symbol candidate vector is detected on the basis of a received signal, a threshold value and an ML metric of each transmission symbol candidate vector are calculated and the ML metric that is larger than the threshold value is updated by the threshold value. Further, a log-likelihood ratio of the transmission signal bit is calculated using the updated ML metric and the threshold value, and a transmission signal is detected using the log-likelihood ratio.

摘要翻译： 本发明涉及计算对数似然比的方法和检测发送信号的方法。 根据本发明，当基于接收信号检测到发送符号候选向量时，计算每个发送符号候选向量的阈值和ML度量，并且更新大于阈值的ML度量 通过阈值。 此外，使用更新的ML度量和阈值来计算发送信号比特的对数似然比，并且使用对数似然比来检测发送信号。

公开(公告)号：US07953165B2

公开(公告)日：2011-05-31

申请号：US11667938

申请日：2005-09-07

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

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

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04L27/00

CPC分类号： H04L27/2626 ,  H04L5/023

摘要： The present invention relates to a transmitter of an OFDMA system capable of controlling a gain for variation of subchannel allocation, and a method thereof. The transmitter includes a subchannel number determining unit, a modulator, a digital/analogue converter, and a gain controller controlling the gain. The subchannel number determining unit determines the number of subchannels in use according to communication environments, and the modulator modulates transmission data with reference to the number of subchannels determined by the subchannel number determining unit and outputs the modulated transmission data. The digital/analogue converter converts the transmission data into analogue data and transmits the converted analogue data through a transmit antenna. The gain controller controls gains of the transmission data according to gain values corresponding to the number of subchannels.

摘要翻译： 本发明涉及能够控制用于子信道分配变化的增益的OFDMA系统的发射机及其方法。 发射机包括子信道号确定单元，调制器，数/模转换器和控制增益的增益控制器。 子信道号确定单元根据通信环境确定正在使用的子信道的数量，并且调制器参照由子信道号确定单元确定的子信道的数量来调制发送数据，并输出调制的发送数据。 数字/模拟转换器将传输数据转换为模拟数据，并通过发送天线发送转换的模拟数据。 增益控制器根据对应于子信道数量的增益值控制传输数据的增益。

公开(公告)号：US20070291633A1

公开(公告)日：2007-12-20

申请号：US11667938

申请日：2005-09-07

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

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

IPC分类号： H04J11/00

CPC分类号： H04L27/2626 ,  H04L5/023

摘要： The present invention relates to a transmitter of an OFDMA system capable of controlling a gain for variation of subchannel allocation, and a method thereof. The transmitter includes a subchannel number determining unit, a modulator, a digital/analogue converter, and a gain controller controlling the gain. The subchannel number determining unit determines the number of subchannels in use according to communication environments, and the modulator modulates transmission data with reference to the number of subchannels determined by the subchannel number determining unit and outputs the modulated transmission data. The digital/analogue converter converts the transmission data into analogue data and transmits the converted analogue data through a transmit antenna. The gain controller controls gains of the transmission data according to gain values corresponding to the number of subchannels.

摘要翻译： 本发明涉及能够控制用于子信道分配变化的增益的OFDMA系统的发射机及其方法。 发射机包括子信道号确定单元，调制器，数/模转换器和控制增益的增益控制器。 子信道号确定单元根据通信环境确定正在使用的子信道的数量，并且调制器参照由子信道号确定单元确定的子信道的数量来调制发送数据，并输出调制的发送数据。 数字/模拟转换器将传输数据转换为模拟数据，并通过发送天线发送转换的模拟数据。 增益控制器根据对应于子信道数量的增益值控制传输数据的增益。

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：US07646749B2

公开(公告)日：2010-01-12

申请号：US11636812

申请日：2006-12-11

申请人： Hyeong-Sook Park ,  Kyung-Yeol Sohn ,  Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

发明人： Hyeong-Sook Park ,  Kyung-Yeol Sohn ,  Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

IPC分类号： H04Q7/00

CPC分类号： H04B7/0617 ,  H04L5/023 ,  H04L27/2608 ,  Y02D70/142 ,  Y02D70/444

摘要： A downlink beamforming apparatus and a transmission apparatus including the same includes a subcarrier based user identifier for dividing subcarriers according to users, a beamforming weight buffer for storing first beamforming weights for the subcarriers by each of transmitting antennas, an interpolator for outputting second beamforming weights for each transmitting antenna by interpolating the first beamforming weights, and a signal reproducer for reproducing the signal for each transmitting antenna. Subcarriers are allocated to the signal by each user; and a complex multiplier multiplies the signal for each transmitting antenna by the second beamforming weights.

摘要翻译： 下行链路波束成形装置及其发送装置包括：用于根据用户分割子载波的基于子载波的用户标识符;波束形成权重缓冲器，用于存储每个发送天线的子载波的第一波束形成权重;内插器，用于输出第二波束形成权重 通过内插第一波束形成权重的每个发射天线，以及用于再现每个发射天线的信号的信号再现器。 子载波由每个用户分配给信号; 并且复数乘法器将每个发射天线的信号乘以第二波束形成权重。

公开(公告)号：US20070135052A1

公开(公告)日：2007-06-14

申请号：US11636812

申请日：2006-12-11

申请人： Hyeong-Sook Park ,  Kyung-Yeol Sohn ,  Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

发明人： Hyeong-Sook Park ,  Kyung-Yeol Sohn ,  Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

IPC分类号： H04B1/00

CPC分类号： H04B7/0617 ,  H04L5/023 ,  H04L27/2608 ,  Y02D70/142 ,  Y02D70/444

摘要： A downlink beamforming apparatus and a transmission apparatus including the same includes a subcarrier based user identifier for dividing subcarriers according to users, a beamforming weight buffer for storing first beamforming weights for the subcarriers by each of transmitting antennas, an interpolator for outputting second beamforming weights for each transmitting antenna by interpolating the first beamforming weights, and a signal reproducer for reproducing the signal for each transmitting antenna. Subcarriers are allocated to the signal by each user; and a complex multiplier multiplies the signal for each transmitting antenna by the second beamforming weights.

摘要翻译： 下行链路波束成形装置及其发送装置包括：用于根据用户分割子载波的基于子载波的用户标识符;波束形成权重缓冲器，用于存储每个发送天线的子载波的第一波束形成权重;内插器，用于输出第二波束形成权重 通过内插第一波束形成权重的每个发射天线，以及用于再现每个发射天线的信号的信号再现器。 子载波由每个用户分配给信号; 并且复数乘法器将每个发射天线的信号乘以第二波束形成权重。