公开(公告)号：US20050152266A1

公开(公告)日：2005-07-14

申请号：US10982581

申请日：2004-11-05

申请人： Chan-Soo Hwang ,  Kee-Bong Song ,  Dong-Jun Lee

发明人： Chan-Soo Hwang ,  Kee-Bong Song ,  Dong-Jun Lee

IPC分类号： H04J99/00 ,  H04B7/04 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

CPC分类号： H04L1/0071 ,  H04L1/06

摘要： An apparatus and method for canceling interference in an OFDM system using multiple antennas, where based on error estimation of a symbol received from a receive antenna, the error of a symbol received from another receive antenna is estimated. Prior to transmission, symbols to be transmitted through a plurality of transmit antennas are shifted by a predetermined number of bits without overlapping. Thus, the effects of an error of a symbol received from a receive antenna on error estimation of a symbol received from another receive antenna are reduced.

摘要翻译： 使用多个天线来消除OFDM系统中的干扰的装置和方法，其中基于从接收天线接收到的符号的误差估计，估计从另一个接收天线接收的符号的误差。 在发送之前，要通过多个发送天线发送的符号被移位预定数量的比特而不重叠。 因此，从接收天线接收的符号的误差对从另一接收天线接收的符号的误差估计的影响减小。

公开(公告)号：US20050122896A1

公开(公告)日：2005-06-09

申请号：US10985515

申请日：2004-11-10

申请人： Kee-Bong Song ,  Chan-Soo Hwang ,  Dong-Jun Lee

发明人： Kee-Bong Song ,  Chan-Soo Hwang ,  Dong-Jun Lee

IPC分类号： H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26 ,  H04Q7/00

CPC分类号： H04L1/0069 ,  H04L1/0071 ,  H04L1/06 ,  H04L27/2602 ,  H04L2001/0098

摘要： In an encoding apparatus in a mobile communication system using a plurality of antennas, a puncturer punctures input coded bits in an RCP (Rate-Compatible Puncturing) method, a distributor divides the punctured coded bits by the number of the antennas depending on how many bits are punctured, an interleaver interleaves the divided coded bits, a modulator modulates the interleaved coded bits, and an arranger prioritizes the modulated symbols, arranges the modulated symbols according to priority levels, and transmits the arranged symbols through the antennas.

摘要翻译： 在使用多个天线的移动通信系统中的编码装置中，穿孔者以RCP（速率兼容穿刺）方法对输入的编码比特进行穿刺，分配器根据多少比特将删截的编码比特划分为天线数 交织器对分割的编码比特进行交织，调制器对交织的编码比特进行调制，编排对调制符号进行优先排列，根据优先级排列调制符号，并通过天线发送排列的符号。

公开(公告)号：US20050152267A1

公开(公告)日：2005-07-14

申请号：US10982582

申请日：2004-11-05

申请人： Kee-Bong Song ,  Chan-Soo Hwang ,  Dong-Jun Lee

发明人： Kee-Bong Song ,  Chan-Soo Hwang ,  Dong-Jun Lee

IPC分类号： H04J99/00 ,  H04J11/00 ,  H04L1/06 ,  H04L27/26

CPC分类号： H04L27/2647 ,  H04L1/0631

摘要： A receiving apparatus and method for receiving signals through a plurality of receive antennas in a mobile communication system. In the receiving apparatus, a plurality of FFTs transform frequency-domain symbol sequences received from the receive antennas to time-domain FFT symbol sequences, an SIC receiver decides the value of a higher-priority transmitted symbol sequence using its FFT symbol sequence and decides the value of a lower-priority transmitted symbol sequence using the decided higher-priority transmitted symbol sequence and its error, a plurality of demodulators demodulate the decided transmitted symbol sequences to a plurality of coded bit streams, a plurality of deinterleavers deinterleave the coded bit streams, stream by stream, and a parallel-to-serial converter converts the deinterleaved coded bit streams to one coded bit stream.

摘要翻译： 一种用于在移动通信系统中通过多个接收天线接收信号的接收装置和方法。 在接收装置中，多个FFT将从接收天线接收的频域符号序列变换为时域FFT符号序列，SIC接收机使用其FFT符号序列来决定更高优先级的发送符号序列的值，并且决定 使用所确定的较高优先级的发送符号序列的低优先级发送符号序列的值及其误差，多个解调器将所确定的发送符号序列解调为多个编码比特流，多个解交织器对编码比特流进行解交织， 并行到串行转换器将解交织的编码比特流转换为一个编码比特流。

公开(公告)号：US20150030139A1

公开(公告)日：2015-01-29

申请号：US14384366

申请日：2012-03-12

申请人： Chan-Soo Hwang ,  Geoffrey G. Moyer ,  Mark B. Flowers

发明人： Chan-Soo Hwang ,  Geoffrey G. Moyer ,  Mark B. Flowers

IPC分类号： H04M3/26

CPC分类号： H04M3/26 ,  H04M3/306 ,  H04M11/062

摘要： In accordance with embodiments disclosed herein, there are provided apparatus, systems and methods for detecting a boundary condition via common mode diagnostics; and to apparatus, systems and methods for detecting a fault condition via common-mode rejection ratio diagnostics. For example, in one embodiment such means include, means for injecting a common mode signal probe onto a first end of a Digital Subscriber Line (DSL line); means for measuring impedance of the common mode signal probe on the DSL line at the first end of the DSL line; means for detecting an impedance anomaly on the DSL line based on the measured impedance of the common mode signal probe; and means for correlating the impedance anomaly on the DSL line to a boundary condition on the DSL line.

摘要翻译： 根据本文公开的实施例，提供了通过共模诊断来检测边界条件的装置，系统和方法; 以及用于通过共模抑制比诊断来检测故障状态的装置，系统和方法。 例如，在一个实施例中，这种装置包括用于将共模信号探针注入到数字用户线路（DSL线路）的第一端上的装置; 用于在DSL线路的第一端测量DSL线上的共模信号探头的阻抗的装置; 用于根据测得的共模信号探头的阻抗来检测DSL线路上的阻抗异常的装置; 以及用于将DSL线路上的阻抗异常与DSL线路上的边界条件相关联的装置。

公开(公告)号：US07889814B2

公开(公告)日：2011-02-15

申请号：US11804126

申请日：2007-05-17

申请人： Chan-Soo Hwang ,  Vahid Tarokh ,  Seung-Hoon Nam ,  Jae-Hak Chung ,  Yung-Soo Kim

发明人： Chan-Soo Hwang ,  Vahid Tarokh ,  Seung-Hoon Nam ,  Jae-Hak Chung ,  Yung-Soo Kim

IPC分类号： H04L27/06

CPC分类号： H04L1/0618 ,  H04B7/0669 ,  H04B7/0697 ,  H04B7/0891 ,  H04L1/0643

摘要： A transmitter and a receiver are disclosed herein that support transmit antenna diversity using space-time block coding in a wireless communication system. The transmitter produces symbol combinations containing, as their elements, input symbols, the inversions and conjugates of the symbols, and symbols obtained by rotating the phases of the symbols once, forms a matrix having symbols in at least two columns orthogonal to each other with the symbol combinations, and transmits the matrix. The receiver detects symbols that minimize maximum likelihood (ML) decoding metrics over all possible symbols using channel gains from transmit antennas to a receive antenna. Also, the receiver selects candidate symbols among all possible symbols according to the characteristics of transmitted modulation symbols and detects symbols that minimize the ML decoding metrics.

摘要翻译： 本文公开的发射器和接收器在无线通信系统中支持使用空时块编码的发射天线分集。 发射机产生符号组合，其包含输入符号，符号的反转和共轭以及通过旋转符号的相位获得的符号一次作为其元素，形成具有彼此正交的至少两列中的符号的矩阵， 符号组合，并传输矩阵。 接收机通过使用从发射天线到接收天线的信道增益，检测所有可能符号上的最大似然（ML）解码度量的符号。 此外，接收机根据发送的调制符号的特性来选择所有可能符号中的候选符号，并且检测使ML解码度量最小化的符号。

公开(公告)号：US07480339B2

公开(公告)日：2009-01-20

申请号：US10695579

申请日：2003-10-28

申请人： Chan-Soo Hwang ,  Yung-Soo Kim ,  Seung-Hoon Nam ,  Jae-Hak Chung

发明人： Chan-Soo Hwang ,  Yung-Soo Kim ,  Seung-Hoon Nam ,  Jae-Hak Chung

IPC分类号： H04B7/02 ,  H03D1/00

CPC分类号： H04L1/0069 ,  H04L1/0618 ,  H04L25/0202

摘要： A mobile communication system includes M transmission antennas, P encoders for receiving P information bit streams and encoding the received information bit streams with a space-time trellis code (STTC), and M modulators for modulating information bit streams output from the P encoders in a predetermined modulation scheme and outputting modulation symbol streams. A sequence used for channel estimation is generated, and the sequence is transmitted in substitute for at least one modulation symbol in a predetermined position through the M transmission antennas, for each of the modulation symbol streams output from the M modulators.

摘要翻译： 一种移动通信系统包括：M个发送天线，用于接收P个信息比特流的P编码器，并用空时格码（STTC）对接收到的信息比特流进行编码; M个调制器，用于调制从P编码器输出的信息比特流 预定调制方案并输出调制符号流。 产生用于信道估计的序列，并且对于从M个调制器输出的每个调制符号流，通​​过M个发送天线，发送该序列以代替预定位置中的至少一个调制符号。

公开(公告)号：US07457372B2

公开(公告)日：2008-11-25

申请号：US10695493

申请日：2003-10-28

申请人： Chan-Soo Hwang ,  Yung-Soo Kim ,  Seung-Hoon Nam ,  Jae-Hak Chung

发明人： Chan-Soo Hwang ,  Yung-Soo Kim ,  Seung-Hoon Nam ,  Jae-Hak Chung

IPC分类号： H04L27/04 ,  H04B1/69

CPC分类号： H04L1/065 ,  H04L1/0069 ,  H04L1/0625 ,  H04L1/0631

摘要： A mobile communication system includes at least three transmission antennas of first to third transmission antennas, and uses an overlapped antenna scheme for grouping the first and second transmission antennas into a first transmission antenna group and grouping the second and third transmission antennas into a second transmission antenna group. First and second modulators modulate L information bit streams to be transmitted through the first transmission antenna group and output first and second modulation symbol streams. Third and fourth modulators modulate L other information bit streams to be transmitted through the second transmission antenna group and output third and fourth symbol streams. First to fourth puncturers puncture at least one modulation symbol in a predetermined position among the first to fourth modulation symbol streams. A multiplexer transmits a modulation symbol stream output from the first puncturer through the first transmission antenna, transmits modulation symbol streams output from the second and third puncturers through the second transmission antenna after summation, and transmits a modulation symbol stream output from the third puncturer through the third transmission antenna.

摘要翻译： 移动通信系统包括第一至第三发射天线的至少三个发射天线，并且使用重叠的天线方案将第一和第二发射天线分组成第一发射天线组，并将第二和第三发射天线分组成第二发射天线 组。 第一和第二调制器调制通过第一发送天线组发送的L个信息比特流并输出第一和第二调制符号流。 第三和第四调制器调制通过第二发送天线组发送的另外的信息比特流并输出第三和第四符号流。 第一至第四穿孔器在第一至第四调制符号流中的预定位置中至少刺穿一个调制符号。 复用器通过第一发送天线发送从第一穿孔器输出的调制符号流，在求和之后通过第二发送天线发送从第二和第三穿孔器输出的调制符号流，并且从第三穿孔器输出的调制符号流通过 第三发射天线。

公开(公告)号：US07333549B2

公开(公告)日：2008-02-19

申请号：US10756073

申请日：2004-01-12

申请人： Jong-Ho Lee ,  Jae-Hak Chung ,  Chan-Soo Hwang ,  Seung-Hoon Nam ,  Do-Young Kwak ,  Jae-Choong Han ,  Seong-Cheol Kim

发明人： Jong-Ho Lee ,  Jae-Hak Chung ,  Chan-Soo Hwang ,  Seung-Hoon Nam ,  Do-Young Kwak ,  Jae-Choong Han ,  Seong-Cheol Kim

IPC分类号： H04L27/28

CPC分类号： H04L25/0236 ,  H04L1/0618 ,  H04L25/0212 ,  H04L27/2649

摘要： A apparatus and method for estimating a sequence of transmitted quadrature amplitude modulation (QAM)-modulated signals and space-time block coded signals using an optimal expectation-maximization (EM)-based iterative estimation algorithm in a multiple-input and multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) mobile communication system. An initial sequence estimation value is produced on the basis of a predetermined initial value using a pilot sub-carrier contained in each of OFDM signals received by a receiving side. A normalized value of a received signal on a channel-by-channel basis is produced by a predetermined equation using orthogonality between the OFDM signals received by the receiving side. At least one subsequent sequence estimation value is produced using the initial sequence estimation value and the normalized value of the received signal on the channel-by-channel basis. If the subsequent sequence estimation value converges to a constant value after an operation of producing the subsequent sequence estimation value is iterated the predetermined number of times, the converged subsequent sequence estimation value is designated as a final sequence estimation value.

摘要翻译： 一种用于在多输入和多输出中使用最佳期望最大化（EM）的迭代估计算法来估计发送的正交幅度调制（QAM）调制信号和时空块编码信号的序列的装置和方法 MIMO） - 正交频分复用（OFDM）移动通信系统。 使用包含在由接收侧接收的每个OFDM信号中的导频子载波，基于预定初始值产生初始序列估计值。 通过使用由接收侧接收的OFDM信号之间的正交性的预定方程式，在逐个信道的基础上产生接收信号的归一化值。 使用初始序列估计值和逐个信道的接收信号的归一化值来产生至少一个后续序列估计值。 如果后续序列估计值在产生后续序列估计值的操作被迭代预定次数之后收敛到常数值，则将收敛后续序列估计值指定为最终序列估计值。

公开(公告)号：US07292644B2

公开(公告)日：2007-11-06

申请号：US10630215

申请日：2003-07-30

申请人： Keum-Chan Whang ,  Chan-Soo Hwang

发明人： Keum-Chan Whang ,  Chan-Soo Hwang

IPC分类号： H04B7/02

CPC分类号： H04L1/0618 ,  H04B7/0669

摘要： Disclosed is a method for generating a space-time trellis code (STTC) for maximizing space-time diversity gain and coding gain in a mobile communication system including at least two transmission antennas and generating a second number of STTC codes with an information data bit stream upon receiving the information data bit stream comprised of a first number of bits. The method comprises calculating a minimum effective length for each of the STTC codes; calculating product distances between all STTC codes having the same length as the minimum effective length, wherein for each of pairs of all initial states and all end states for each of the STTC codes, initial states are identical to end states; summing reciprocals of product distances between all the STTC codes for each of the STTC codes, and calculating minimum average product distances by determining a reciprocal of the summation result; and selecting an STTC code corresponding to a minimum average product distance having a maximum value among the minimum average product distances as an STTC code corresponding to the information data bit stream.

摘要翻译： 公开了一种用于在包括至少两个发送天线的移动通信系统中产生用于最大化时空分集增益和编码增益的时空网格码（STTC）的方法，并且用信息数据比特流生成第二数量的STTC码 一旦接收到由第一位数组成的信息数据比特流。 该方法包括计算每个STTC码的最小有效长度; 计算具有与最小有效长度相同长度的所有STTC码之间的商品距离，其中对于每个STTC码的所有初始状态和所有结束状态的对中的每一对，初始状态与终端状态相同; 对每个STTC代码对所有STTC代码之间的乘积距离进行求和，并且通过确定求和结果的倒数来计算最小平均乘积距离; 以及将与所述最小平均乘积距离中具有最大值的最小平均乘积距离对应的STTC码选择为与所述信息数据比特流对应的STTC码。

公开(公告)号：US20060262714A1

公开(公告)日：2006-11-23

申请号：US10546081

申请日：2004-02-13

申请人： Vahid Tarokh ,  Jae-Hak Chung ,  Yung-Soo Kim ,  Chan-Soo Hwang

发明人： Vahid Tarokh ,  Jae-Hak Chung ,  Yung-Soo Kim ,  Chan-Soo Hwang

IPC分类号： H04J11/00 ,  H04J1/00

CPC分类号： H04L27/2623 ,  H04L1/0618 ,  H04L27/2615

摘要： Provided is a method of reducing a peak-to-average-power ratio in a multiple antenna orthogonal frequency division multiplexing communication system. The method includes: reducing a peak-to-average-power ratio of input serial data sequences; space-time coding the input serial data sequences with the reduced peak-to-average-power ratio to generate N symbols to be tranmitted via N antennas; receiving the serial data sequences of the N symbols to transform the serial data sequences into N parallel data sequences; allocating each of the N parallel data sequences to Ns sub-carriers and performing Inverse Fast Fourier Transform on the N parallel data sequences; transforming the N parallel data sequences into N serial data symbols; and replicating a portion of the serial data symbols to generate cyclic prefixes and interleaving the cyclic prefixes into starting portions of the serial data symbols to cyclically expand the N symbols.

摘要翻译： 提供了一种降低多天线正交频分复用通信系统中的峰值与平均功率比的方法。 该方法包括：降低输入串行数据序列的峰值与平均功率比; 以降低的峰均功率比对输入串行数据序列进行时空编码，以产生要通过N个天线发射的N个符号; 接收N个符号的串行数据序列以将串行数据序列变换成N个并行数据序列; 将N个并行数据序列中的每一个分配给N个子载波，并在N个并行数据序列上执行快速傅立叶逆变换; 将N个并行数据序列变换为N个串行数据符号; 并且复制一部分串行数据符号以产生循环前缀并且将循环前缀交织到串行数据符号的起始部分中以循环地扩展N个符号。