公开(公告)号：US5483551A

公开(公告)日：1996-01-09

申请号：US100584

申请日：1993-07-30

申请人： Gang Huang ,  Gi-Hong Im ,  Jean-Jacques Werner

发明人： Gang Huang ,  Gi-Hong Im ,  Jean-Jacques Werner

IPC分类号： H04M1/74 ,  H04B3/20 ,  H04B3/23 ,  H04B7/015 ,  H04B1/38 ,  H04L5/16

CPC分类号： H04B3/23

摘要： To reduce near-end crosstalk (NEXT) in systems possessing excess bandwidth, a signal is transmitted from a first to a second location. At the second location, the received signal is examined and a characteristic of this signal is determined while the delay provided in the transmit signal path at this location is varied. Based on this examination, a particular amount of delay is introduced into the transmit signal path which reduces NEXT. This process is repeated for each direction of transmission. In the disclosed embodiment, the characteristic of the received signal which is determined is the mean square error and the amount of delay selected is that corresponding to the minimum mean square error.

摘要翻译： 为了减少具有超额带宽的系统中的近端串扰（NEXT），信号从第一位置传输到第二位置。 在第二位置，检测接收到的信号，并且确定该信号的特性，同时在该位置处的发送信号路径中提供的延迟是变化的。 基于该检查，将特定量的延迟引入到减少NEXT的发送信号路径中。 对于每个传输方向重复该过程。 在所公开的实施例中，确定的接收信号的特性是均方误差，所选择的延迟量是对应于最小均方误差。

公开(公告)号：US5646957A

公开(公告)日：1997-07-08

申请号：US508945

申请日：1995-07-28

申请人： Gi-Hong Im ,  Naresh Ramnath Shanbhag ,  Jean-Jacques Werner

发明人： Gi-Hong Im ,  Naresh Ramnath Shanbhag ,  Jean-Jacques Werner

IPC分类号： H03H21/00 ,  H03H17/02 ,  H04B3/06 ,  H04L25/03 ,  H03H7/40

CPC分类号： H04L25/03038 ,  H04L2025/03509 ,  H04L2025/03611

摘要： Briefly, in accordance with one embodiment of the invention, an adaptive equalizer comprises: a digital filter including filter tap coefficients; a slicer; and a filter tap coefficient update block. The filter, slicer and coefficient update block are configured so as to perform at least one burst update of the filter tap coefficients. In accordance with another embodiment of the invention, a method of updating the filter tap coefficients of an adaptive equalizer comprises the step of: performing at least one burst update of the filter tap coefficients.

摘要翻译： 简而言之，根据本发明的一个实施例，自适应均衡器包括：包括滤波器抽头系数的数字滤波器; 切片机 和滤波器抽头系数更新块。 滤波器，限幅器和系数更新块被配置为执行滤波器抽头系数的至少一个突发更新。 根据本发明的另一个实施例，一种更新自适应均衡器的滤波器抽头系数的方法包括以下步骤：执行滤波器抽头系数的至少一个突发更新。

公开(公告)号：US5363441A

公开(公告)日：1994-11-08

申请号：US195595

申请日：1994-02-14

申请人： Alexander Feiner ,  Gi-Hong Im ,  Joseph G. Kneuer ,  Burton R. Saltzberg ,  Jean-Jacques Werner

发明人： Alexander Feiner ,  Gi-Hong Im ,  Joseph G. Kneuer ,  Burton R. Saltzberg ,  Jean-Jacques Werner

IPC分类号： H04B3/23 ,  H04M3/00 ,  H04M3/40 ,  H04M3/56

CPC分类号： H04M3/56 ,  H04M3/002 ,  H04M3/568 ,  H04M3/40

摘要： Distortion and instability due to echoes in conference communications is reduced through the use of an echo estimating filter disposed in a conference bridging circuit. This circuit includes a signal combiner which receives information signals from each of the parties in the conference communications and provides an output signal which is a combination of the received information signals and an echo compensation signal. The echo estimating filter provides this echo compensation signal in response to the combiner output signal. Advantageously, the echo estimating filter can be fixed or adaptive. In the latter case, the adaptation can be in response to the received information signals or to training sequences.

摘要翻译： 通过使用布置在会议桥接电路中的回波估计滤波器，减少会议通信中回波引起的失真和不稳定性。 该电路包括在会议通信中从各方接收信息信号的信号组合器，并提供作为接收到的信息信号和回波补偿信号的组合的输出信号。 回波估计滤波器响应于组合器输出信号提供该回波补偿信号。 有利地，回波估计滤波器可以是固定的或适应的。 在后一种情况下，适应可以响应于所接收的信息信号或训练序列。

公开(公告)号：US5805696A

公开(公告)日：1998-09-08

申请号：US762554

申请日：1996-12-09

申请人： Gi-Hong Im ,  Burton Reuben Saltzberg ,  Jean-Jacques Werner

发明人： Gi-Hong Im ,  Burton Reuben Saltzberg ,  Jean-Jacques Werner

IPC分类号： H04M9/08 ,  H04M1/00 ,  G06F17/10 ,  H04B3/20

CPC分类号： H04M9/082

摘要： A device for providing conferencing communications. The device comprises: a summing circuit for forming a signal sum equal to a sum of signals received from at least three information signal sources along with an echo compensation signal, the signal received from each information source including echoes and the signal sum including an aggregation of such echoes; an adaptive filter having an input and an output, the input being solely responsive to the signal sum and the output being only coupled to the summing circuit, the filter forming the echo compensation signal which is an estimate of the aggregation of echoes; and a low level training sequence generator having an amplitude less than a predetermined level. The adaptive filter has coefficients whose respective values are varied in response to a training sequence comprising a plurality of a priori known values supplied by the low level training sequence generator and the predetermined level is below that of the signal received from the each information source.

摘要翻译： 用于提供会议通信的设备。 该装置包括：求和电路，用于形成等于从至少三个信息信号源接收的信号之和以及回波补偿信号的信号总和，从包括回波的每个信息源接收的信号和包括聚合的信号和 这样的回声; 具有输入和输出的自适应滤波器，所述输入仅响应于所述信号和并且所述输出仅耦合到所述求和电路，所述滤波器形成作为所述回波的聚合的估计的所述回波补偿信号; 以及具有小于预定电平的振幅的低电平训练序列发生器。 自适应滤波器具有响应于包括由低电平训练序列发生器提供的多个先验已知值的训练序列而变化的系数，并且预定电平低于从每个信息源接收的信号的训练序列。

公开(公告)号：US20070258528A1

公开(公告)日：2007-11-08

申请号：US11787433

申请日：2007-04-16

申请人： Jong-Hyung Kwun ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Uj-Kun Kwon ,  Gi-Hong Im ,  Jung-Hun Ryu

发明人： Jong-Hyung Kwun ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Uj-Kun Kwon ,  Gi-Hong Im ,  Jung-Hun Ryu

IPC分类号： H04L27/28 ,  H04L25/08 ,  H04L1/00

CPC分类号： H04L27/2623 ,  H04L27/2647

摘要： Provided are an apparatus for reducing clipping noise in a broadband wireless communication system in which a clipping method is used and a method thereof. The method includes, when clipped signals are received, decoding and equalizing the received signals to determine transmitted symbols, comparing the magnitudes of the amplitudes of the determined transmitted symbols with a predetermined reference value, and reconstructing signals using the amplitudes of the transmitted symbols and the phases of the received signals when it is determined that the magnitudes of the amplitudes of the transmitted symbols are greater than the reference value.

摘要翻译： 提供了一种用于在其中使用限幅方法的宽带无线通信系统中减少削波噪声的装置及其方法。 该方法包括：当接收到限幅信号时，对接收到的信号进行解码和均衡以确定发送的符号，将所确定的发送符号的幅度的大小与预定的参考值进行比较，以及使用所发送的符号的幅度和 当确定发送符号的幅度的大小大于参考值时，接收信号的相位。

公开(公告)号：US20060087960A1

公开(公告)日：2006-04-27

申请号：US11116909

申请日：2005-04-28

申请人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Jong-Bu Lim

发明人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Jong-Bu Lim

IPC分类号： H04J11/00

CPC分类号： H04B7/02 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0055 ,  H04L1/0606 ,  H04L27/2602

摘要： A new diversity scheme for orthogonal frequency division multiplexing/multi-input multi-output (OFDM/MIMO) systems. The new diversity scheme, i.e., turbo layered space-frequency coded OFDM (TLSFC-OFDM), uses the turbo principle with space hopping (SH). The TLSFC-OFDM system uses a successive interference cancellation (SIC) algorithm to reduce the number of iterations. As a result, this scheme reduces computational complexity. Simulation results show that the SIC-based TLSFC-OFDM system outperforms a conventional OFDM/Horizontal Bell Labs Layered Space-Time (H-BLAST) system using a horizontal coding scheme.

摘要翻译： 一种用于正交频分复用/多输入多输出（OFDM / MIMO）系统的新分集方案。 新的分集方案，即turbo分层空间频率编码的OFDM（TLSFC-OFDM），使用具有空间跳变（SH）的turbo原理。 TLSFC-OFDM系统使用连续干扰消除（SIC）算法来减少迭代次数。 因此，该方案降低了计算复杂度。 仿真结果表明，基于SIC的TLSFC-OFDM系统优于使用水平编码方案的常规OFDM /水平贝尔实验室分层时空（H-BLAST）系统。

公开(公告)号：US20060215541A1

公开(公告)日：2006-09-28

申请号：US11387415

申请日：2006-03-23

申请人： Jong-Hyung Kwun ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Hui-Chul Won ,  Jin-Ho Jang

发明人： Jong-Hyung Kwun ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Hui-Chul Won ,  Jin-Ho Jang

IPC分类号： H04J11/00

CPC分类号： H04L1/0606 ,  H04B7/06 ,  H04L25/03159

摘要： Disclosed is a transceiving apparatus and method in which a space frequency block coding (SFBC) technique is applied to the SC-FDE technique. The transceiving method encodes an input signal into frequency-domain blocks so as to output at least two signal blocks in parallel to each other, inserts a cyclic prefix (CP) into the output signal blocks, and outputs the signal blocks through the same sub-channel by means of corresponding antenna.

摘要翻译： 公开了一种将空间频率块编码（SFBC）技术应用于SC-FDE技术的收发装置和方法。 收发方法将输入信号编码成频域块，以便彼此并行地输出至少两个信号块，将循环前缀（CP）插入到输出信号块中，并通过相同子帧输出信号块， 通过相应的天线。

公开(公告)号：US20050271152A1

公开(公告)日：2005-12-08

申请号：US11143040

申请日：2005-06-02

申请人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Cheol-Jin Park

发明人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Cheol-Jin Park

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

CPC分类号： H04L27/264 ,  H04L27/2634

摘要： Disclosed is a multicarrier-based wireless communication system including a base station for providing a multiple access service to terminals which filter multitone transmitting signals through filters and transmit the filtered signals. A transmitter of the respective terminals includes a multiplexer for multiplexing an input signal and outputting the signal as a plurality of transmitting signals, at least one filter bank for filtering the plurality of transmitting signals, an inverse fast Fourier transformer for executing inverse fast Fourier transform of the filtered transmitting signals output from the filter bank, and a filter information generator for providing filter information to the filter bank. Since the transmitter of the present invention distinguishes users from each other by a filter and thus no synchronization is required between users, which causes a problem in an uplink of the multicarrier-based wireless communication system, system performance can be expected to be improved.

摘要翻译： 公开了一种基于多载波的无线通信系统，其包括用于向通过滤波器过滤多频发送信号的终端提供多址服务的基站，并发送经滤波的信号。 各个终端的发射机包括多路复用器，用于多路复用输入信号并输出​​该信号作为多个发送信号，至少一个用于对多个发送信号进行滤波的滤波器组，用于执行快速傅立叶逆变换 从滤波器组输出的经滤波的发送信号，以及用于向滤波器组提供滤波器信息的滤波器信息发生器。 由于本发明的发射机通过滤波器将用户彼此区分，因此在用户之间不需要同步，这导致基于多载波的无线通信系统的上行链路中的问题，可以期望提高系统性能。

公开(公告)号：US20050008085A1

公开(公告)日：2005-01-13

申请号：US10846465

申请日：2004-05-14

申请人： Jong-Hyeuk Lee ,  Yung-soo Kim ,  Gi-Hong Im ,  Hui-Chul Won ,  Cheol-Jin Park

发明人： Jong-Hyeuk Lee ,  Yung-soo Kim ,  Gi-Hong Im ,  Hui-Chul Won ,  Cheol-Jin Park

IPC分类号： H04J11/00 ,  H04L25/03 ,  H04L27/26 ,  H04K1/10

CPC分类号： H04L5/006 ,  H04L5/0007 ,  H04L5/0046 ,  H04L2025/03414

摘要： A preprocessing apparatus and method for a transmitter and a receiver to prevent system performance degradation caused by Inter-Channel Interference (ICI) or inter-symbol interference (ISI) in an OFDM system. In the OFDM system using N carriers having different frequency bands and K carriers of the N carriers designated as redundant carriers, the transmitter renders ICI-causing parts to be zeroes in a data frame, when a cyclic prefix is not longer than a channel impulse response. Therefore, the ICI is prevented. The receiver eliminates the ISI involved in a current frame using an interference estimated from a previous data frame. Therefore, noise spread caused by the use of redundant carriers is prevented and system complexity is remarkably reduced.

摘要翻译： 一种用于在OFDM系统中防止由信道间干扰（ICI）或符号间干扰（ISI）引起的系统性能下降的发射机和接收机的预处理装置和方法。 在使用具有不同频带的N个载波的OFDM系统和指定为冗余载波的N个载波的K个载波的情况下，当循环前缀不长于信道脉冲响应时，发射机在数据帧中使ICI引起的部分为零 。 因此，ICI被阻止。 接收器使用从先前数据帧估计的干扰消除了当前帧中涉及的ISI。 因此，防止使用冗余载波引起的噪声扩展，并且系统复杂度显着降低。

公开(公告)号：US07751464B2

公开(公告)日：2010-07-06

申请号：US11768563

申请日：2007-06-26

申请人： Young-Doo Kim ,  Eung Sun Kim ,  Chang Wook Ahn ,  Gi-Hong Im ,  Jong-Bu Lim ,  Tae-Won Yune ,  Chan-Ho Choi

发明人： Young-Doo Kim ,  Eung Sun Kim ,  Chang Wook Ahn ,  Gi-Hong Im ,  Jong-Bu Lim ,  Tae-Won Yune ,  Chan-Ho Choi

IPC分类号： H04L27/30

CPC分类号： H04B1/71072 ,  H04L27/2636 ,  H04L27/2647

摘要： A method and apparatus for transmitting and receiving data by performing an iterative multi-user detection is provided. The apparatus includes: a receives a transmission signal and generates a received signal, the transmission signal being generated by modulating a single carrier signal via a modulation process, specialized for each user, in a wireless communication system; an interference canceled signal generator which generates an interference canceled signal by canceling a signal interference using a demodulated signal with respect to the received signal, the signal interference being caused by an other user; and a demodulated signal generator which generates the demodulated signal by demodulating the received signal via a demodulation process using the interference canceled signal, the demodulation process being specialized for each user, wherein the demodulated signal, which is generated by performing the generating of the interference canceled signal and the generating of the demodulated signal at least once, is adopted as a final demodulated signal.

摘要翻译： 提供了一种通过执行迭代多用户检测来发送和接收数据的方法和装置。 该装置包括：a接收传输信号并产生接收信号，该传输信号是通过在无线通信系统中经由专用于每个用户的调制过程调制单载波信号产生的; 干扰消除信号发生器，其通过使用相对于接收信号的解调信号消除信号干扰来产生干扰消除信号，所述信号干扰由另一用户引起; 以及解调信号发生器，其通过使用干扰消除信号的解调处理解调接收信号来产生解调信号，解调处理专用于每个用户，其中通过执行消除干扰的产生而产生的解调信号 信号和至少一次解调信号的产生被采用作为最终的解调信号。