公开(公告)号：US07954035B2

公开(公告)日：2011-05-31

申请号：US11722214

申请日：2005-03-25

申请人： Su-Chang Chae ,  Youn-Ok Park

发明人： Su-Chang Chae ,  Youn-Ok Park

IPC分类号： H03M13/00

CPC分类号： H03M13/116 ,  H03M13/1177

摘要： The present invention provides an LDPC encoder, a channel encoder of a portable internet system including the LDPC encoder, and an encoding method thereof. The LDPC encoder according to the present invention generates a Costas array, shifts it, generates an analogous circulation parity check matrix having a repeated pattern from the shifted Costas array, and performs encoding by using the parity check matrix. With this LDPC encoder, complexity of encoding system may be reduced.

摘要翻译： 本发明提供一种LDPC编码器，包括LDPC编码器的便携式互联网系统的信道编码器及其编码方法。 根据本发明的LDPC编码器生成Costas阵列，将其移位，从移位的Costas阵列生成具有重复模式的类似循环奇偶校验矩阵，并通过使用奇偶校验矩阵进行编码。 利用该LDPC编码器，可以减少编码系统的复杂性。

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：US07593754B2

公开(公告)日：2009-09-22

申请号：US11635715

申请日：2006-12-07

申请人： Young-Ha Lee ,  Youn-Ok Park

发明人： Young-Ha Lee ,  Youn-Ok Park

IPC分类号： H04M1/00 ,  H04Q7/20

CPC分类号： H04B7/0845

摘要： A receiving method and apparatus of an orthogonal frequency division multiplexing access system having multiple antennas that is capable of improving system design and realization of integration degree by reducing complexity of fast Fourier transform (FFT) and noncoherent combination is provided. The receiving apparatus of a communication system having multiple antennas includes a parallel/series converter for converting data received according to each receiving path from parallel to series data; a fast Fourier transform (FFT) unit for fast Fourier transforming the data converted from parallel to series data; a series/parallel converter for converting the fast Fourier transformed series data from series to parallel data; a series noncoherent combiner for noncoherently combining the fast Fourier transformed series data and outputting the noncoherent combined data; a channel estimator/compensator for channel-estimating/compensating the data converted to parallel according to respective receiving paths; and a coherent combiner for coherently combining the channel-estimated/compensated data and for outputting the coherent combined data.

摘要翻译： 提供了具有多个天线的正交频分复用接入系统的接收方法和装置，其能够通过降低快速傅里叶变换（FFT）和非相干组合的复杂度来改善系统设计和集成度的实现。 具有多个天线的通信系统的接收装置包括用于将根据每个接收路径接收的数据从并行转换为串行数据的并行/串联转换器; 快速傅立叶变换（FFT）单元，用于将从并行转换的数据快速傅里叶变换成串行数据; 用于将快速傅里叶变换的串行数据从串行数据转换为并行数据的串/并行转换器; 一种用于非相干组合快速傅立叶变换序列数据并输出非相干组合数据的串联非相干组合器; 信道估计/补偿器，用于根据各个接收路径对被转换为并行的数据进行信道估计/补偿; 以及用于相干地组合信道估计/补偿数据并输出相干组合数据的相干组合器。

公开(公告)号：US20080310318A1

公开(公告)日：2008-12-18

申请号：US12094897

申请日：2006-12-08

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

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

IPC分类号： H04L12/26

CPC分类号： H04W24/00 ,  H04B17/12 ,  H04W24/08 ,  H04W88/08

摘要： In a signal monitoring apparatus of a base station of a communication system having multiple antennas, a transmitting/receiving unit transmits a plurality of transmit signals by using the multiple antennas or processes a plurality of receive signals received through the multiple antennas. A radio frequency calibration unit calibrates the transmit signals transmitted through the multiple antennas, and processes at least one target transmit signal among the plurality of transmit signals so as to monitor the at least one target transmit signal. A signal monitoring unit receives at least one first signal or at least one second signal, and transmits the at least one first signal or the at least one second signal to user equipment. The at least one first signal is a signal processed from at least one target receive signal among the plurality of receive signals, and the at least one second signal is a signal processed from the at least one target transmit signal by controlling the radio frequency calibration unit.

摘要翻译： 在具有多个天线的通信系统的基站的信号监视装置中，发送/接收单元通过使用多个天线发送多个发送信号，或处理通过多个天线接收的多个接收信号。 射频校准单元校准通过多个天线发射的发射信号，并处理多个发射信号中的至少一个目标发射信号，以便监测至少一个目标发射信号。 信号监测单元接收至少一个第一信号或至少一个第二信号，并将所述至少一个第一信号或至少一个第二信号发送给用户设备。 所述至少一个第一信号是从所述多个接收信号中的至少一个目标接收信号处理的信号，并且所述至少一个第二信号是通过控制所述射频校准单元从所述至少一个目标发射信号处理的信号 。

公开(公告)号：US20080305804A1

公开(公告)日：2008-12-11

申请号：US12094763

申请日：2006-12-08

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

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

IPC分类号： H04Q7/20 ,  H04M1/00

CPC分类号： H04L27/2655 ,  H04L27/2646

摘要： When a base station of a time division duplex based mobile communication system receives an initial ranging request signal from a subscriber station, the base station generates initial ranging information including delay time information to the subscriber station, and receives uplink data delayed and transmitted using a delay time from the subscriber station. Also, when the subscriber station transmits an initial ranging request signal to the base station and receives initial ranging information including delay time information from the base station, the subscriber station establishes a transmission parameter value by using the transmission parameter value included in the initial ranging information and transmits uplink data by using the established delay time.

摘要翻译： 当基于时分双工的移动通信系统的基站从用户站接收到初始测距请求信号时，基站向用户站生成包括延迟时间信息的初始测距信息，并且接收延迟并使用延迟发送的上行链路数据 来自用户站的时间。 此外，当用户台向基站发送初始测距请求信号并从基站接收包括延迟时间信息的初始测距信息时，用户台通过使用包含在初始测距信息中的传输参数值来建立传输参数值 并通过使用建立的延迟时间来发送上行链路数据。

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：US20050141626A1

公开(公告)日：2005-06-30

申请号：US10970208

申请日：2004-10-20

申请人： Young-Ha Lee ,  Chang-Wahn Yu ,  Youn-Ok Park ,  Seung-Ku Hwang

发明人： Young-Ha Lee ,  Chang-Wahn Yu ,  Youn-Ok Park ,  Seung-Ku Hwang

IPC分类号： H04J11/00 ,  H04K1/10 ,  H04L5/02 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L25/0232 ,  H04L5/023

摘要： In the uplink of an OFDMA system, a preamble is used to estimate a channel and then the pilot tones of a data symbol are used for channel estimation to update the channel estimate. The channel estimate is used for channel compensation, and the phase of the channel is corrected using the channel estimate obtained from the pilot tones. In this way, the channel estimation performance and hence the compensation ability can be enhanced.

摘要翻译： 在OFDMA系统的上行链路中，使用前导码来估计信道，然后将数据符号的导频音调用于信道估计以更新信道估计。 信道估计用于信道补偿，并且使用从导频音获得的信道估计来校正信道的相位。 以这种方式，可以提高信道估计性能和补偿能力。

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：US08098777B2

公开(公告)日：2012-01-17

申请号：US11930047

申请日：2007-10-30

申请人： Seung-Jae Bahng ,  Young-Jo Bang ,  Youn-Ok Park

发明人： Seung-Jae Bahng ,  Young-Jo Bang ,  Youn-Ok Park

IPC分类号： H03D1/04 ,  H03D1/06 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08

CPC分类号： H04B7/0413 ,  H04L1/0656 ,  H04L25/0204 ,  H04L25/0246

摘要： The present invention relates to a signal detection method and a receiving apparatus in a multiple input multiple output (MIMO) system. More particularly, the present invention relates to a signal detection device in a MIMO system using a spatial multiplexing (SM) method. In the signal detection method, a channel is estimated and layers are rearranged according to a predetermined layer arrangement rule. QR-decomposition is performed by using a rearranged system model, all constellation points in a symbol of a layer having the lowest reliability are considered, and symbols are detected by using a sequential interference elimination method.

摘要翻译： 本发明涉及多输入多输出（MIMO）系统中的信号检测方法和接收装置。 更具体地，本发明涉及使用空间复用（SM）方法的MIMO系统中的信号检测装置。 在信号检测方法中，估计信道并根据预定层布置规则重新布置层。 通过使用重排系统模型进行QR分解，考虑具有最低可靠性的层的符号中的所有星座点，并且通过使用顺序干扰消除方法来检测符号。