公开(公告)号：US20110141955A1

公开(公告)日：2011-06-16

申请号：US12969551

申请日：2010-12-15

Applicant: Hyun-Gu PARK ,  Sok-Kyu Lee

Inventor： Hyun-Gu PARK ,  Sok-Kyu Lee

IPC: H04L12/56 ,  H04B7/00

CPC classification number: H04W74/0875 ,  H04W72/1242

Abstract: Provided is a method and apparatus for transmitting a packet in a wireless communication system. A method for transmitting a packet by a packet transmission apparatus in a wireless communication system includes determining whether the packet is a response packet, and transmitting the packet with a higher channel access opportunity than another packet transmission apparatus of the wireless communication system, if the packet is a response packet.Accordingly, it is possible to solve the problem that the total system performance degrades because a packet transmission apparatus fails to fully use its own transmission time by failing to rapidly receive a response packet even when packets remain to be transmitted in a wireless communication system using a contention-based channel access scheme.

Abstract translation: 提供了一种用于在无线通信系统中发送分组的方法和装置。 一种用于在无线通信系统中由分组发送装置发送分组的方法包括：确定该分组是否是响应分组，并且如果分组的分组具有比另一无线通信系统的分组发送装置更高的信道接入机会，则发送分组 是一个响应包。 因此，可以解决总体系统性能下降的问题，因为即使在使用无线通信系统的无线通信系统中仍然要发送分组的情况下，由于分组发送装置未能充分利用自身的发送时间而无法快速接收到应答分组， 基于争用的频道接入方案。

公开(公告)号：US07916797B2

公开(公告)日：2011-03-29

申请号：US11286996

申请日：2005-11-22

Applicant: Heejung Yu ,  Taehyun Jeon ,  Myung-Soon Kim ,  Eun-Young Choi ,  Sok-Kyu Lee ,  Deuk-Su Lyu

Inventor： Heejung Yu ,  Taehyun Jeon ,  Myung-Soon Kim ,  Eun-Young Choi ,  Sok-Kyu Lee ,  Deuk-Su Lyu

IPC: H04K1/10 ,  H04L27/00 ,  H04J11/00

CPC classification number: H04L27/266 ,  H04L27/2659 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2682 ,  H04L27/2685 ,  H04L27/2695

Abstract: An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.

Abstract translation: 提供了一种用于跟踪残余频率误差，相位误差，定时误差和信号幅度变化的误差跟踪装置和方法，以增强正交频分复用（OFDM）系统中的相位误差跟踪性能和跟踪速度。 误差跟踪装置和方法包括：频率误差校正器，用于通过将初始载波频率误差估计值加上跟踪载波误差估计值来校正时域的频率; 信号幅度跟踪校正器，用于通过将通过快速傅里叶变换（FFT）转换的输入信号乘以与所计算的接收导频信号的功率相对应的输出值来控制信号幅度; 信道校正器，用于通过将接收导频信号乘以接收导频信号的频率信道响应的复共轭来输出信道校正信号; 载波频率误差估计器，用于使用所述信道校正的导频来估计载波频率误差参数，并提供所述跟踪载波频率误差估计值; 时间偏移估计器，用于使用所述通道校正的导频来估计时间偏移参数; 以及载波相位误差估计器，用于使用信道校正的导频来估计载波相位误差参数。

公开(公告)号：US20110069648A1

公开(公告)日：2011-03-24

申请号：US12884591

申请日：2010-09-17

Applicant: Il-Gu LEE ,  Hun-Sik Kang ,  Sok-Kyu Lee

Inventor： Il-Gu LEE ,  Hun-Sik Kang ,  Sok-Kyu Lee

IPC: H04J3/22 ,  H04B7/00

CPC classification number: H04L7/041 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/1607

Abstract: Provided are apparatus and method for transmitting and receiving data for a wireless communication system. The method includes generating a first aggregation packet by controlling the number of preambles or by controlling a size of a packet according to a channel state of a channel formed to at least one reception terminal or according to a state of the reception terminal, and transmitting the first aggregation packet to the reception terminal.

Abstract translation: 提供了一种用于无线通信系统的发送和接收数据的装置和方法。 该方法包括：通过控制前导码的数量或根据形成于至少一个接收终端的信道的信道状态或根据接收终端的状态来控制分组的大小来生成第一聚合分组，并且发送 第一聚合分组到接收终端。

公开(公告)号：US20100177757A1

公开(公告)日：2010-07-15

申请号：US12688064

申请日：2010-01-15

Applicant: Yun-Joo KIM ,  Jeeyon CHOI ,  Sok-Kyu LEE

Inventor： Yun-Joo KIM ,  Jeeyon CHOI ,  Sok-Kyu LEE

IPC: H04W40/00

CPC classification number: H04W74/0816 ,  H04W88/06 ,  H04W88/10

Abstract: A transmission opportunity setting method in a wireless LAN system using multiple channels includes: receiving a request-to-send (RTS) frame from a wireless station, the RTS frame including information on a wireless LAN mode of the wireless station; and transmitting a clear-to-send (CTS) frame to the wireless station according to at least one of the number of remaining available channels among the multiple channels and the wireless LAN mode of the wireless station.

Abstract translation: 在使用多个信道的无线LAN系统中的传输机会设置方法包括：从无线站接收请求发送（RTS）帧，所述RTS帧包括关于所述无线站的无线LAN模式的信息; 以及根据所述多个信道中的剩余可用信道数和所述无线站的无线LAN模式中的至少一个，向所述无线站发送清除发送（CTS）帧。

公开(公告)号：US20100150281A1

公开(公告)日：2010-06-17

申请号：US12633919

申请日：2009-12-09

Applicant: Yu-Ro LEE ,  Minho Cheong ,  Jong-Eo Oh ,  Jeevon Choi ,  Sok-Kyu Lee

Inventor： Yu-Ro LEE ,  Minho Cheong ,  Jong-Eo Oh ,  Jeevon Choi ,  Sok-Kyu Lee

IPC: H04L27/06

CPC classification number: H04L25/067 ,  H04L25/03006 ,  H04L2025/03426

Abstract: Provided are an apparatus and method for reception in a MIMO system. An apparatus for calculating a signal weight, includes: at least two multiplexers configured to receive, a data stream corresponding to a weight inputted and multiplex the received data stream prior to output; a multiplexing control unit configured to control the outputs of the respective multiplexers and provide a clock of a predetermined rate and a clock of a double rate two times higher than the predetermined rate; a first multiplier configured to receive multiplexed data outputted from the respective multiplexers and multiply the multiplexed data; a first storage unit configured to latch the multiplication result of the first multiplier by the double-rate clock prior to output; an adder configured to add the output of the first storage unit and the output of the first multiplier; and a second storage unit configured to latch the addition.

Abstract translation: 提供了一种用于MIMO系统中的接收的装置和方法。 一种用于计算信号权重的装置，包括：至少两个多路复用器，被配置为在输出之前接收与所输入的权重相对应的数据流并对所接收的数据流进行多路复用; 复用控制单元，被配置为控制各个多路复用器的输出，并提供预定速率的时钟和比预定速率高两倍的双倍速率的时钟; 第一乘法器，被配置为接收从各个多路复用器输出的多路复用数据并乘以多路复用数据; 第一存储单元，被配置为在输出之前将所述第一乘法器的乘法结果锁存为双速率时钟; 加法器，被配置为将第一存储单元的输出和第一乘法器的输出相加; 以及第二存储单元，被配置为锁存所述相加。

公开(公告)号：US20100150257A1

公开(公告)日：2010-06-17

申请号：US12556023

申请日：2009-09-09

Applicant: Il-Gu Lee ,  Hun-Sik Kang ,  Sok-Kyu Lee

Inventor： Il-Gu Lee ,  Hun-Sik Kang ,  Sok-Kyu Lee

IPC: H04L7/00 ,  H04L27/28 ,  H04B15/00

CPC classification number: H04L27/2662 ,  H04L27/2657 ,  H04L27/2675

Abstract: A method for estimating timing offset in an OFDM wireless communication system using preamble and pilot includes: estimating a carrier offset by using preamble included in a currently received OFDM packet and estimating a first timing offset based on the estimated carrier offset to thereby produce a first timing offset estimation value; estimating a second timing offset to thereby produce a second timing offset estimation value by transforming the OFDM packet into signals of frequency domain and using a pilot signal of the frequency-domain signals; checking a channel condition based on packet error information of a previously received packet to thereby produce error condition information, and selecting one between the first timing offset estimation value and the second timing offset estimation value based on the error condition information; and compensating data signals for timing offset among the frequency-domain signals the based on the selected timing offset estimation value.

Abstract translation: 用于使用前导码和导频来估计OFDM无线通信系统中的定时偏移的方法包括：通过使用包括在当前接收的OFDM分组中的前导码来估计载波偏移，并且基于所估计的载波偏移来估计第一定时偏移，从而产生第一定时 偏移估计值; 通过将所述OFDM分组变换为频域的信号并使用所述频域信号的导频信号来估计第二定时偏移，从而产生第二定时偏移估计值; 基于先前接收到的分组的分组错误信息来检查信道条件，从而产生错误条件信息，并且基于所述错误条件信息在所述第一定时偏移估计值和所述第二定时偏移估计值之间进行选择; 以及基于所选择的定时偏移估计值，在频域信号之间补偿用于定时偏移的数据信号。

公开(公告)号：US20100037119A1

公开(公告)日：2010-02-11

申请号：US12517455

申请日：2007-12-05

Applicant: Jong-Ee Oh ,  Yu-Ro Lee ,  Chanho Yoon ,  Minho Cheong ,  Sok-Kyu Lee ,  Yoo-Seung Song ,  Younggyun Kim

Inventor： Jong-Ee Oh ,  Yu-Ro Lee ,  Chanho Yoon ,  Minho Cheong ,  Sok-Kyu Lee ,  Yoo-Seung Song ,  Younggyun Kim

IPC: H03M13/05 ,  G06F11/10

CPC classification number: H03M13/1122 ,  H03M13/1117 ,  H03M13/112 ,  H03M13/6527 ,  H03M13/6544 ,  H03M13/6577 ,  H03M13/658 ,  H03M13/6583

Abstract: An apparatus and method for updating a check node of a low-density parity check (LDPC) code in order to decode the LDPC code are provided. The method includes the operations of: (a) obtaining a first bit of a first minimum value among input values, the number of input values being equal to the number of degrees of the check node, by performing an AND operation on first bits of the input values, the first bits being most significant bits of the input values; (b) obtaining result values by switching and sequentially performing an XOR operation and an OR operation on the first bit of the first minimum value and each of the first bits of the input values; and (c) performing operations (a) and (b) on the result values set as input values and performing operations (a) and (b) a number of times corresponding to the number of bits of each input value, that is, repeating until last bits are set as input values, to thereby obtain the first minimum value, the last bits being least significant bits of the input values. Accordingly, the complexity of hardware is reduced, and super high-speed processing is possible.

Abstract translation: 提供了一种用于更新低密度奇偶校验（LDPC）码的校验节点以便解码LDPC码的装置和方法。 该方法包括以下操作：（a）通过对所述校验节点的第一比特执行“与”运算，获得输入值中的第一最小值的第一比特，输入值的数目等于校验节点的度数。 输入值，第一位是输入值的最高有效位; （b）通过对所述第一最小值的所述第一位和所述输入值的所述第一位中的每一个进行切换和顺序执行异或运算和或运算来获得结果值; 和（c）对设置为输入值的结果值执行操作（a）和（b），并且执行操作（a）和（b）与每个输入值的位数相对应的次数，即重复 直到最后的位被设置为输入值为止，从而获得第一最小值，最后的位是输入值的最低有效位。 因此，硬件的复杂度降低，超高速处理成为可能。

公开(公告)号：US20100031116A1

公开(公告)日：2010-02-04

申请号：US12443688

申请日：2007-10-01

Applicant: Chan-Ho Yoon ,  Jong-Ee Oh ,  Min-Ho Cheong ,  Yu-Ro Lee ,  Sok-Kyu Lee ,  Hee-Jung Yu ,  Seung-Chan Bang

Inventor： Chan-Ho Yoon ,  Jong-Ee Oh ,  Min-Ho Cheong ,  Yu-Ro Lee ,  Sok-Kyu Lee ,  Hee-Jung Yu ,  Seung-Chan Bang

IPC: H03M13/05 ,  G06F11/10

CPC classification number: H03M13/116 ,  H03M13/1185 ,  H03M13/1188

Abstract: There is provided to a method for encoding an LDPC (Low Density Parity Check) code using the result of checking a previously specified parity, including the steps of: forming a parity bit check matrix having a dual diagonal structure consisting of (N-K) rows for check nodes and (N-K) columns on the basis of the H matrix; calculating the values of all the parity bits by inserting a given binary value in sub-blocks, with the parity bit check matrix formed on the H matrix; if the values of the parity bits are incorrect, checking the parity bit corresponding to the sub-block located in the last part of the H matrix; searching the parity bit parts where the parity bit check result is represented as “1”; performing an XOR operation in sub-blocks on the parity bit part obtained through a simultaneous equation between the parity bits of the searched parity bit parts and the parity bit parts; and determining the value of the parity bit satisfying the condition that the value obtained by multiplying the H matrix by a code word vector.

Abstract translation: 提供了一种使用检查先前指定的奇偶校验的结果来编码LDPC（低密度奇偶校验）码的方法，包括以下步骤：形成具有由（NK）行组成的双对角线结构的奇偶校验位校验矩阵，用于 基于H矩阵检查节点和（NK）列; 通过在H块中形成奇偶校验位校验矩阵，在子块中插入给定的二进制值来计算所有奇偶校验位的值; 如果奇偶校验位的值不正确，则检查与位于H矩阵的最后部分中的子块相对应的奇偶校验位; 搜索奇偶校验位检查结果被表示为“1”的奇偶校验位部分; 在通过搜索到的奇偶校验位部分的奇偶校验位与奇偶校验位部分之间的联立方程获得的奇偶校验位部分的子块中执行异或运算; 以及确定所述奇偶校验位的值满足将所述H矩阵乘以码字矢量而获得的值的条件。

公开(公告)号：US20090158113A1

公开(公告)日：2009-06-18

申请号：US12208006

申请日：2008-09-10

Applicant: Chanho YOON ,  Jung-Bo SON ,  Hun-Sik KANG ,  Sok-Kyu LEE

Inventor： Chanho YOON ,  Jung-Bo SON ,  Hun-Sik KANG ,  Sok-Kyu LEE

IPC: H03M13/05 ,  G06F11/07

CPC classification number: H03M13/1188 ,  H03M13/1111 ,  H03M13/6502

Abstract: Provided is an apparatus and method for encoding a Low Density Parity Check (LDPC) code using a message passing algorithm. The apparatus, includes: a parity calculating unit for operating a check node value on an input bit and a predetermined parity bit according to the message passing algorithm and calculating a parity bit; a parity correcting unit for correcting the calculated parity bit according to a parity check result of the calculated parity bit; and an output transform unit for combining the input bit and the corrected parity bit.

Abstract translation: 提供了一种使用消息传递算法对低密度奇偶校验（LDPC）码进行编码的装置和方法。 该装置包括：奇偶校验计算单元，用于根据消息传递算法操作输入比特和预定奇偶校验位上的校验节点值，并计算奇偶校验位; 奇偶校验单元，用于根据所计算的奇偶校验位的奇偶校验结果校正所计算的奇偶校验位; 以及输出变换单元，用于组合输入位和校正奇偶校验位。

公开(公告)号：US20090154604A1

公开(公告)日：2009-06-18

申请号：US12178150

申请日：2008-07-23

Applicant: Yu-Ro LEE ,  Jong-Ee OH ,  Minho CHEONG ,  Sok-Kyu LEE

Inventor： Yu-Ro LEE ,  Jong-Ee OH ,  Minho CHEONG ,  Sok-Kyu LEE

IPC: H04L27/06

CPC classification number: H04L27/2647 ,  H04B7/0413 ,  H04L25/061 ,  H04L25/067

Abstract: Provided are a multi-dimensional detector for a receiver of an MIMO system and a method thereof. The multi-dimensional detector includes a first symbol detecting unit for calculating symbol distance values using an upper triangular matrix (R) obtained from QR decomposition to detect an mth symbol; a symbol deciding unit for deciding a symbol having a minimum distance value among the calculated symbol distance values from the first symbol detecting unit; and a second symbol detecting unit for calculating symbol distance values using an updated received signal y and the upper triangular matrix R to detect a (m−1)th symbol.

Abstract translation: 提供了一种用于MIMO系统的接收机的多维检测器及其方法。 多维检测器包括：第一符号检测单元，用于使用从QR分解获得的上三角矩阵（R）来计算符号距离值以检测第m个符号; 符号判定单元，用于从所述第一符号检测单元确定所计算的符号距离值中具有最小距离值的符号; 以及第二符号检测单元，用于使用更新的接收信号y和上三角矩阵R来计算符号距离值以检测第（m-1）个符号。