公开(公告)号：US07782977B2

公开(公告)日：2010-08-24

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： H04K1/02

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：US20070133703A1

公开(公告)日：2007-06-14

申请号：US11636815

申请日：2006-12-11

申请人： Jun-Woo Kim ,  Jae-Gun Jung ,  Dae-Ho Kim ,  Hyeong-Sook Park ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Jae-Gun Jung ,  Dae-Ho Kim ,  Hyeong-Sook Park ,  Youn-Ok Park

IPC分类号： H04K1/10

CPC分类号： H04L27/2608 ,  H04L25/03866 ,  H04L27/2647

摘要： A terminal demodulation apparatus previously stores a received frame signal in a memory before inputting the same into a fast Fourier transform (FFT) unit, performs a demodulation to necessary information read from the corresponding memory, and has a separate data subcarrier memory and pilot subcarrier memory, and uses the signal demodulation method mixed with a subcarrier allocation method so as to easily demodulate various subcarrier allocation methods.

摘要翻译： 终端解调装置预先将存储器中的接收帧信号存储在存储器中，并将其输入到快速傅里叶变换（FFT）单元中，对从相应的存储器读取的必要信息进行解调，并具有单独的数据副载波存储器和导频副载波存储器 并且使用与子载波分配方法混合的信号解调方法，以便容易地解调各种副载波分配方法。

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：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：US07907686B2

公开(公告)日：2011-03-15

申请号：US11930029

申请日：2007-10-30

申请人： Jun-Woo Kim ,  Youn-Ok Park

发明人： Jun-Woo Kim ,  Youn-Ok Park

IPC分类号： H04L27/06

CPC分类号： H04L27/2647 ,  H04L1/0052 ,  H04L5/023

摘要： The present invention relates to a demodulating device and method in an orthogonal frequency division multiple access (OFDMA) communication system. A demodulating device according to an exemplary embodiment of the invention uses only one demodulator, one slot buffer, and one channel decoder to demodulate a plurality of data bursts included in one frame. In addition, in order to reduce a memory size required to demodulate a plurality of data bursts, a memory is managed in the units of sub-channels, instead of classifying memory cells so as to correspond to the data bursts. According to the demodulating device, it is possible to simplify a hardware structure and to reduce a memory size required to demodulate data bursts. As a result, it is possible to reduce manufacturing costs and decrease the number of signal lines of a channel decoder required for an interface.

摘要翻译： 本发明涉及正交频分多址（OFDMA）通信系统中的解调装置和方法。 根据本发明的示例性实施例的解调装置仅使用一个解调器，一个时隙缓冲器和一个信道解码器来解调包括在一个帧中的多个数据突发。 此外，为了减少解调多个数据脉冲串所需的存储器大小，以子信道为单位来管理存储器，而不是分类存储器单元以对应于数据脉冲串。 根据解调装置，可以简化硬件结构并减少解调数据脉冲串所需的存储器大小。 结果，可以降低制造成本并减少接口所需的通道解码器的信号线的数量。

公开(公告)号：US20090231992A1

公开(公告)日：2009-09-17

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： H04J11/00 ,  H04K1/10

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. According to the present invention, the FFT operation and the IFFT operation are processed by one FFT/IFFT operator in the MIMO-OFDM modulation/demodulation apparatus, so that symbols to be modulated/demodulated may be properly scheduled, a minimum number of FFT/IFFT operators may be needed, and a delay of data processing may be minimized.

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，具有相同定时的发送/接收符号被插入到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。 根据本发明，MIMO-OFDM调制/解调装置中的FFT / IFFT运算符对FFT运算和IFFT运算进行处理，从而可以适当地调整要调制/解调的符号，FFT / 可能需要IFFT运算符，并且数据处理的延迟可以被最小化。

公开(公告)号：US20080209298A1

公开(公告)日：2008-08-28

申请号：US11722041

申请日：2005-11-28

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

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

IPC分类号： H04L1/08 ,  G06F11/14

CPC分类号： H04L1/1845 ,  H04L1/0071 ,  H04L1/1812 ,  H04L1/1819 ,  H04L1/1867

摘要： In a decoding apparatus in a portable Internet terminal, a channel encoded symbol received from a transmitter is decoded by one of a chase-combining scheme and a code-combining scheme selected based on an ID value of the subpacket indicating a start position of the symbol. In this case, the chase-combining scheme is partly used for the encoded symbol of the information bit. With such a mode, decoding can be performed at a low code rate.

摘要翻译： 在便携式因特网终端中的解码装置中，从发送器接收到的信道编码符号通过追踪合并方案和基于子包的ID值选择的代码组合方案中的一个进行解码，指示符号的开始位置 。 在这种情况下，追踪合成方案被部分地用于信息比特的编码符号。 利用这种模式，可以以低码率执行解码。

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：US08571009B2

公开(公告)日：2013-10-29

申请号：US12533982

申请日：2009-07-31

申请人： Eon Young Hong ,  Jun-Woo Kim ,  Youn Ok Park

发明人： Eon Young Hong ,  Jun-Woo Kim ,  Youn Ok Park

IPC分类号： H04L5/12

CPC分类号： H04L12/66

摘要： Provided are a transmitting apparatus and voice data transmitting and receiving methods for providing VoIP services. When a call is started and an analog signal including a voice signal is input, the transmitting apparatus divides the analog signal into a plurality of voice data packets for transmission. Here, the plurality of voice data packets are generated by sampling with different phases in the same frequency. In addition, the transmitting apparatus inserts a time indication bit that is changed every transmission period into each of the voice data packets and transmits the voice data packets, and distinguishes voice data corresponding to a current transmission period based on the time indication bit.

摘要翻译： 提供了一种用于提供VoIP服务的发送装置和语音数据发送和接收方法。 当呼叫开始并且包括语音信号的模拟信号被输入时，发送装置将模拟信号分成多个语音数据分组进行发送。 这里，通过以相同频率的不同相位采样来生成多个语音数据分组。 此外，发送装置将每个发送周期变化的时间指示比特插入到每个语音数据分组中，并发送语音数据分组，并根据时间指示比特来区分与当前的发送周期对应的语音数据。

公开(公告)号：US20120051298A1

公开(公告)日：2012-03-01

申请号：US13140334

申请日：2009-07-17

申请人： Jun-Woo Kim ,  Jung Pil Choi ,  Eon Young Hong ,  Youn Ok Park

发明人： Jun-Woo Kim ,  Jung Pil Choi ,  Eon Young Hong ,  Youn Ok Park

IPC分类号： H04W72/04

CPC分类号： H04W72/042

摘要： Provided are a method and an apparatus for transmitting resource allocation information. In the case when a wireless resource for a new terminal is fixedly allocated to a fixed allocation zone, the apparatus for transmitting resource allocation information determines a resource allocation method of allocating the wireless resource and determines an allocation form of a resource that is allocated by a resource allocation method to select any one information displaying method of a plurality of information displaying methods of displaying allocation information on the allocated resource on the basis of the determined resource allocation method and resource allocation form. Next, the resource allocation information is generated and transmitted on the basis of the selected displaying method.

摘要翻译： 提供了一种用于传送资源分配信息的方法和装置。 在将新终端的无线资源固定地分配给固定分配区域的情况下，用于发送资源分配信息的装置决定分配无线资源的资源分配方法，并且确定分配给资源的资源的分配形式 资源分配方法，用于基于所确定的资源分配方法和资源分配形式来选择在所分配的资源上显示分配信息的多种信息显示方法的任何一种信息显示方法。 接下来，基于所选择的显示方法生成并发送资源分配信息。