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：US07746966B2

公开(公告)日：2010-06-29

申请号：US11791442

申请日：2005-06-24

申请人： Yong-Su Lee ,  Youn-Ok Park ,  Jun-Woo Kim ,  Young-Jo Bang

发明人： Yong-Su Lee ,  Youn-Ok Park ,  Jun-Woo Kim ,  Young-Jo Bang

IPC分类号： H04L27/08

CPC分类号： H03G3/3078 ,  H04L27/2647 ,  H04L27/2662

摘要： The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof. The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref−Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref−Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value MAX; and a gain controller which increases or decreases the gain, level by level, according to the count inspection result of the count inspector.

摘要翻译： 本发明涉及OFDM系统中的移动台调制解调器的初始同步之前的自动增益控制（AGC）的方法及其装置。 AGC装置包括：初始同步检查器，其验证是否已经执行了输入块样本（k）信号的初始同步; 在没有执行初始同步的情况下，对于输入块样本（k）信号将帧划分成预定间隔B（k）的帧分割器; 参考值检查器，将预定参考值Pref和采样数据平均能量Pcalc之间的差值Pref-Pcalc与预定值进行比较; 当由参考值检查器比较的差值Pref-Pcalc大于或小于预定值时增加或减少计数的计数控制器; 当输入块样本（k）达到最大值MAX时，检查计数是否大于或小于0的计数检查器; 以及根据计数检查员的计数检查结果逐级增加或减少增益的增益控制器。

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：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：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：US08005182B2

公开(公告)日：2011-08-23

申请号：US11925686

申请日：2007-10-26

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

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

IPC分类号： H03D3/24

CPC分类号： H04L27/266 ,  H04L27/2659 ,  H04L27/2679

摘要： The present invention relates to an apparatus and method of compensating for a frequency offset in an orthogonal frequency division multiple access system that is capable of efficiently estimating and compensating for the frequency offset. A receiver of the orthogonal frequency division multiple access system can individually estimate a fractional frequency offset and an integer frequency offset by using a downlink preamble signal. Further, the receiver can compensate for the frequency offset by adding the integer frequency offset once after completely compensating for the fractional frequency offset. Therefore, it is possible to efficiently compensate for the frequency offset.

摘要翻译： 本发明涉及一种能够有效地估计和补偿频偏的正交频分多址系统中的频偏的补偿装置和方法。 正交频分多址系统的接收机可以通过使用下行链路前导码信号单独地估计分数频率偏移和整数频率偏移。 此外，接收机可以通过在完全补偿分数频率偏移之后加上整数频率偏移一次来补偿频率偏移。 因此，可以有效地补偿频率偏移。

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：US07796577B2

公开(公告)日：2010-09-14

申请号：US11721421

申请日：2005-11-22

申请人： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

IPC分类号： H04J1/00 ,  H04J11/00 ,  H04W4/00 ,  H04B1/40 ,  H04B1/034 ,  H03D7/16

CPC分类号： H04L27/265 ,  H04L27/263

摘要： The present invention provides a method for designing operation schedules of a fast Fourier transform (FFT) and a multiple input multiple output orthogonal frequency division multiplexing modem (MIMO-OFDM modem) thereof. According to the present invention, an operation speed of an FFT operator is set up, a receiving symbol is arranged in an OFDM symbol duration in an FFT after receiving the symbol, a transmitting symbol is arranged in an OFDM symbol duration in the FFT schedule before transmitting the symbol, a transmitting/receiving symbol which has the same timing is inserted into an idle symbol duration of the FFT schedule, an FFT schedule which is good to be deleted is deleted, and symbols of the deleted FFT schedule are re-arranged in order to not have an error occur in transmitting/receiving timing.

摘要翻译： 本发明提供一种用于设计快速傅立叶变换（FFT）及其多输入多输出正交频分复用调制解调器（MIMO-OFDM调制解调器）的操作计划的方法。 根据本发明，建立FFT运算符的运算速度，在接收到符号之后，在FFT中以OFDM符号持续时间方式布置接收符号，在FFT调度表中以OFDM符号持续时间内排列发送符号 发送符号时，将具有相同定时的发送/接收符号插入到FFT调度的空闲符号持续时间中，删除良好被删除的FFT调度，并且将删除的FFT调度的符号重新排列在 为了在发送/接收定时中不发生错误。

公开(公告)号：US20080123517A1

公开(公告)日：2008-05-29

申请号：US11720605

申请日：2005-11-10

申请人： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0016 ,  H04L25/03866 ,  H04L27/2602 ,  H04L27/2656 ,  H04L27/2678

摘要： A receiving apparatus of a mobile terminal receiving a signal in a synchronous OFDM system under a multi-cell environment, including a demodulation start controller performing frame synchronization and cell search using a received signal and outputting information on a demodulation start point and a to-be-demodulated neighbor cell; a FFT unit converting a time-domain signal into a frequency-domain signal; a scramble code generator generating scramble codes for the to-be-demodulated neighbor cell from the demodulation start controller and the current cell; a correlator multiplying a signal from the FFT unit and scramble codes from the scramble code generator and outputting correlation signals; demodulators provided corresponding to a current cell and a maximum number of neighbor cells to be demodulated, and demodulating the correlation signals; and a decoder decoding signals from the demodulators and restoring original information transmitted from the corresponding cell.

摘要翻译： 一种在多小区环境下在同步OFDM系统中接收信号的移动终端的接收装置，包括：解调启动控制器，使用接收信号执行帧同步和小区搜索，并输出关于解调起始点和待机信号的信息 调制相邻单元; 将时域信号转换为频域信号的FFT单元; 扰码代码生成器，用于从解调起始控制器和当前小区为待解调的相邻小区生成扰码; 相关器将来自FFT单元的信号和来自加扰码发生器的扰码相乘并输出相关信号; 对应于当前小区提供的解调器和要被解调的最大数量的相邻小区，以及对相关信号进行解调; 以及解码器，对来自解调器的信号进行解码并恢复从相应的单元发送的原始信息。