公开(公告)号：US07333570B2

公开(公告)日：2008-02-19

申请号：US10454731

申请日：2003-06-03

申请人： Edward Aung ,  Henry Lui ,  Paul Butler ,  John Turner ,  Rakesh Patel ,  Chong Lee

发明人： Edward Aung ,  Henry Lui ,  Paul Butler ,  John Turner ,  Rakesh Patel ,  Chong Lee

IPC分类号： H04L27/00

CPC分类号： H04L25/03273 ,  G11C7/22 ,  G11C7/222 ,  H03L7/07 ,  H03L7/0802 ,  H03L7/0814 ,  H03L7/089 ,  H03L7/0891 ,  H03L7/0995 ,  H03L7/187 ,  H03L7/199 ,  H03M9/00 ,  H04L7/0025 ,  H04L7/02 ,  H04L7/033 ,  H04L7/0337 ,  H04L25/0228

摘要： A programmable logic device (“PLD”) is augmented with programmable clock data recover (“CDR”) circuitry to allow the PLD to communicate via any of a large number of CDR signaling protocols. The CDR circuitry may be integrated with the PLD, or it may be wholly or partly on a separate integrated circuit. The circuitry may be capable of CDR input, CDR output, or both. The CDR capability may be provided in combination with other non-CDR signaling capability such as non-CDR low voltage differential signaling (“LVDS”). The circuitry may be part of a larger system.

摘要翻译： 可编程逻辑器件（“PLD”）用可编程时钟数据恢复（“CDR”）电路进行增强，以允许PLD通过大量CDR信令协议中的任何一个进行通信。 CDR电路可以与PLD集成，或者它可以全部或部分地在单独的集成电路上。 电路可能能够进行CDR输入，CDR输出或两者。 CDR能力可以与其他非CDR信令能力组合提供，例如非CDR低电压差分信号（“LVDS”）。 电路可以是较大系统的一部分。

公开(公告)号：US20070153930A1

公开(公告)日：2007-07-05

申请号：US11646751

申请日：2006-12-28

申请人： Anthony Reid

发明人： Anthony Reid

IPC分类号： H04K1/10

CPC分类号： H04L27/2657 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/03248 ,  H04L25/03273 ,  H04L25/03292 ,  H04L27/261 ,  H04L27/2662 ,  H04L27/2665 ,  H04L27/2679

摘要： A method includes determining a number of observations. Each observation occurs at an observation time and corresponds to one of a number of received frequency multiplexed training symbols. The method also includes determining a number of roots of a first polynomial equation that is a function of a variable corresponding to frequency offset errors of carrier frequencies of the training symbols. Constants in the first polynomial equation are determined using at least the observations. The roots of the variable correspond to possible frequency offset errors. Based on at least the observations, the possible frequency offset errors, and possible symbol timing offset errors of the observation times of the training symbols, a number of estimated channel responses are determined corresponding to the training symbols. The method includes using a second polynomial equation that is a function of at least the estimated channel responses, the possible frequency offset errors, and the possible symbol timing offset errors, determining at least a resultant frequency offset error and a resultant symbol timing offset error. The method further includes using the resultant frequency offset error and resultant symbol timing offset error in order to receive at least one frequency multiplexed data symbol.

摘要翻译： 一种方法包括确定多个观察值。 每个观察发生在观察时间，并且对应于多个接收频率复用训练符号中的一个。 该方法还包括确定第一多项式方程的根数，其是对应于训练符号的载波频率的频率偏移误差的变量的函数。 使用至少观察值确定第一个多项式方程中的常数。 变量的根对应于可能的频偏错误。 基于训练符号的观察时间的至少观察值，可能的频率偏移误差和可能的符号定时偏移误差，对应于训练符号确定多个估计的信道响应。 该方法包括使用至少是所估计的信道响应，可能的频率偏移误差和可能的符号定时偏移误差的函数的第二多项式方程，至少确定合成的频率偏移误差和合成的符号定时偏移误差。 该方法还包括使用所得到的频率偏移误差和结果符号定时偏移误差，以便接收至少一个频率复用数据符号。

公开(公告)号：US20070071110A1

公开(公告)日：2007-03-29

申请号：US11456774

申请日：2006-07-11

申请人： In Hwan Choi ,  Kyung Kang ,  Kook Kwak ,  Young Hong ,  Sung Hong

发明人： In Hwan Choi ,  Kyung Kang ,  Kook Kwak ,  Young Hong ,  Sung Hong

IPC分类号： H04B1/66 ,  H04L25/03

CPC分类号： H04B1/68 ,  H03M13/2732 ,  H03M13/2936 ,  H04L25/03273 ,  H04L2025/03382

摘要： A digital television (DTV) transmitter and a method of coding data in the DTV transmitter method are disclosed. A pre-processes enhanced data by coding the enhanced data for forward error correction (FEC) and expanding the FEC-coded enhanced data. A data formatter generates enhanced data packets including the pre-processed enhanced data and inserting known data to at least one of the enhanced data packets. A first multiplexer multiplexes main data packets with the enhanced data packets, and a data randomizer randomizes the multiplexed data packets. A Reed-Solomon (RS) encoder RS-codes the randomized data packets by adding first parity data, and a data interleaver interleaves the RS-coded data packets. A trellis encoder trellis-encodes the interleaved data packets, wherein the trellis encoder may be initialized when a known data sequence is inputted thereto.

摘要翻译： 公开了一种数字电视（DTV）发射机和DTV发射机方法中的数据编码方法。 通过对用于前向纠错（FEC）的增强数据进行编码并扩展FEC编码的增强数据来预处理增强数据。 数据格式化器生成增强的数据分组，包括预处理的增强数据，并将已知数据插入到增强数据分组中的至少一个。 第一复用器将主数据分组与增强数据分组复用，并且数据随机化器将复用的数据分组随机化。 里德 - 所罗门（RS）编码器通过添加第一奇偶校验数据RS编码随机数据分组，并且数据交织器交织RS编码的数据分组。 网格编码器对交织的数据分组进行网格编码，其中当已知的数据序列被输入时，网格编码器可被初始化。

公开(公告)号：US20070058759A1

公开(公告)日：2007-03-15

申请号：US11599334

申请日：2006-11-15

申请人： Thomas Kwon ,  Jonathan Min ,  Fang Lu ,  Thomas Kolze

发明人： Thomas Kwon ,  Jonathan Min ,  Fang Lu ,  Thomas Kolze

IPC分类号： H04L27/06 ,  H04B1/10

CPC分类号： H04L25/03273 ,  H04L25/03057 ,  H04L27/3827 ,  H04L2025/0349 ,  H04L2027/003 ,  H04L2027/004 ,  H04L2027/0055 ,  H04L2027/0061

摘要： A receiver includes a filter stage that receives, filters, and equalizes a received signal, and a decisional feedback loop coupled to the filter stage that receives and processes a signal output from the filter stage using remodulation. The decisional feedback loop includes a converter that generates a baseband signal, a detector that generates a decision signal, a restorative signal generator that generates a restorative signal using remodulation, and a carrier loop that generates a frequency correction signal and provides a frequency-offset estimate. The restorative signal and the frequency correction signal are provided to the converter to compensate for inter-symbol interference. The presented “remodulation” technique decouples interaction between the carrier loop, the pre-filters, and the equalizer of the restorative signal generator, providing an architecture that is more stable and significantly faster than conventional architectures.

摘要翻译： 接收机包括接收，滤波和均衡接收信号的滤波器级，以及耦合到滤波器级的判决反馈回路，其接收并处理从再过滤阶段输出的信号。 判决反馈回路包括产生基带信号的转换器，产生判定信号的检测器，使用再调制产生恢复信号的恢复信号发生器，以及产生频率校正信号并提供频偏估计的载波环路 。 将修复信号和频率校正信号提供给转换器以补偿符号间干扰。 所提出的“再调制”技术解耦了载体环路，预滤波器和恢复信号发生器的均衡器之间的相互作用，提供比传统架构更稳定和显着更快的架构。

公开(公告)号：US06473471B2

公开(公告)日：2002-10-29

申请号：US08699774

申请日：1996-08-13

申请人： Björn Lindquist ,  Paul W. Dent

发明人： Björn Lindquist ,  Paul W. Dent

IPC分类号： H04L2706

CPC分类号： H03D7/165 ,  H03D3/008 ,  H04L25/03273 ,  H04L27/233 ,  H04L2025/03401 ,  H04L2025/03407

摘要： A method for processing a signal modulated with information symbols to account for an additive offset and slope is disclosed. First, an initial estimate of offset and slope is made and hypotheses of all possible values of a sequence of one or more information symbols are then made. For each of said hypotheses, the associated data symbol sequence is used to make an improved estimate of offset and slope and the improved estimate of offset and slope are stored against each of the hypotheses. For each hypothesis, the improved estimate of offset and slope is used in calculating an expected signal value and a mismatch between a sample of the modulated signal and the expected value is computed. The hypotheses are then sequentially extended by one symbol, the slope and offset estimates are updated and the mismatches are accumulated to form a path metric value for each extended hypothesis, and resolving between said hypotheses based on said path metric values using a Viterbi Sequential Maximum Likelihood Sequence Estimation process to produce a most likely hypothesis of said modulated information symbols substantially unimpaired by said additive slope and offset.

摘要翻译： 公开了一种处理用信息符号调制以解决附加偏移和斜率的信号的方法。 首先，进行偏移和斜率的初始估计，然后进行一个或多个信息符号的序列的所有可能值的假设。 对于每个所述假设，相关联的数据符号序列用于对偏移和斜率进行改进的估计，并且针对每个假设存储改进的偏移和斜率估计。 对于每个假设，在计算预期信号值时使用改进的偏移和斜率估计，并且计算调制信号的样本与期望值之间的失配。 然后将假设顺序地扩展一个符号，更新斜率和偏移估计，并且不匹配被累积以形成每个扩展假设的路径度量值，并且基于使用维特比序列最大似然的所述路径度量值在所述假设之间进行解析 序列估计过程，以产生基本上不受所述相加斜率和偏移量影响的所述调制信息符号的最可能假设。

公开(公告)号：US06442219B1

公开(公告)日：2002-08-27

申请号：US09284874

申请日：1999-04-22

申请人： Cyril Bertrand ,  Fabien Buda ,  Emmanuel Lemois

发明人： Cyril Bertrand ,  Fabien Buda ,  Emmanuel Lemois

IPC分类号： H03D100

CPC分类号： H04L25/03273 ,  H04L27/2332 ,  H04L2027/0067

摘要： A method of simultaneous phase synchronization and decoding that makes use of the maximum likelihood criterion is provided. The method is applied to signal packets received at a receiver, wherein the signals have been subjected to convolution encoding at the transmitter. The method consists of calculating branch metrics taking account firstly of firm decisions calculated on the received symbols and secondly of a magnitude that takes account of the phase error between the carrier of the signal and the local oscillator signal used at the receiver, the magnitude weighting the decision variables constituted by the complex digital components of the received symbols. This magnitude is equal to &Sgr;*k for each of the paths studied where: &Sgr;k=&Sgr;Nn=0rk−n·d*k−n.

摘要翻译： 提供了利用最大似然准则的同步相位同步和解码的方法。 该方法被应用于对在接收机处接收到的分组进行信号，其中信号已经在发射机处进行卷积编码。 该方法包括计算分支度量，首先考虑在接收符号上计算的确定决策，其次考虑信号载波与接收机使用的本地振荡器信号之间的相位误差的幅度，幅度加权 决策变量由接收符号的复数数字分量组成。 对于所研究的每个路径，该幅度等于SIGMA * k：

公开(公告)号：US20020071506A1

公开(公告)日：2002-06-13

申请号：US08699774

申请日：1996-08-13

发明人： BJORN LINDQUIST ,  PAUL W. DENT

IPC分类号： H04L027/06

CPC分类号： H03D7/165 ,  H03D3/008 ,  H04L25/03273 ,  H04L27/233 ,  H04L2025/03401 ,  H04L2025/03407

摘要： A method for processing a signal modulated with information symbols to account for an additive offset and slope is disclosed. First, an initial estimate of offset and slope is made and hypotheses of all possible values of a sequence of one or more information symbols are then made. For each of said hypotheses, the associated data symbol sequence is used to make an improved estimate of offset and slope and the improved estimate of offset and slope are stored against each of the hypotheses. For each hypothesis, the improved estimate of offset and slope is used in calculating an expected signal value and a mismatch between a sample of the modulated signal and the expected value is computed. The hypotheses are then sequentially extended by one symbol, the slope and offset estimates are updated and the mismatches are accumulated to form a path metric value for each extended hypothesis, and resolving between said hypotheses based on said path metric values using a Viterbi Sequential Maximum Likelihood Sequence Estimation process to produce a most likely hypothesis of said modulated information symbols substantially unimpaired by said additive slope and offset.

摘要翻译： 公开了一种处理用信息符号调制以解决附加偏移和斜率的信号的方法。 首先，进行偏移和斜率的初始估计，然后进行一个或多个信息符号的序列的所有可能值的假设。 对于每个所述假设，相关联的数据符号序列用于对偏移和斜率进行改进的估计，并且针对每个假设存储改进的偏移和斜率估计。 对于每个假设，在计算预期信号值时使用改进的偏移和斜率估计，并且计算调制信号的样本与期望值之间的失配。 然后将假设顺序地扩展一个符号，更新斜率和偏移估计，并且不匹配被累积以形成每个扩展假设的路径度量值，并且基于使用维特比序列最大似然的所述路径度量值在所述假设之间进行解析 序列估计过程，以产生基本上不受所述相加斜率和偏移量影响的所述调制信息符号的最可能假设。

公开(公告)号：US5712637A

公开(公告)日：1998-01-27

申请号：US686399

申请日：1996-07-25

申请人： Bjorn Lindquist ,  Paul W. Dent

发明人： Bjorn Lindquist ,  Paul W. Dent

IPC分类号： H03M3/02 ,  H03D3/00 ,  H03D7/16 ,  H03M13/39 ,  H04B1/26 ,  H04B1/30 ,  H04L25/03 ,  H04L27/14 ,  H04L27/22 ,  H04L27/233 ,  H03M1/12

CPC分类号： H03D7/165 ,  H03D3/008 ,  H04L25/03273 ,  H04L27/233 ,  H04L2025/03401 ,  H04L2025/03407

摘要： A method for processing a signal modulated with information symbols to account for an additive offset and slope is disclosed. First, an initial estimate of offset and slope is made and hypotheses of all possible values of a sequence of one or more information symbols are then made. For each of said hypotheses, the associated data symbol sequence is used to make an improved estimate of offset and slope and the improved estimate of offset and slope are stored against each of the hypotheses. For each hypothesis, the improved estimate of offset and slope is used in calculating an expected signal value and a mismatch between a sample of the modulated signal and the expected value is computed. The hypotheses are then sequentially extended by one symbol, the slope and offset estimates arc updated and the mismatches are accumulated to form a path metric value for each extended hypothesis, and resolving between said hypotheses based on said path metric values using a Viterbi Sequential Maximum Likelihood Sequence Estimation process to produce a most likely hypothesis of said modulated information symbols substantially unimpaired by said additive slope and offset.

摘要翻译： 公开了一种处理用信息符号调制以解决附加偏移和斜率的信号的方法。 首先，进行偏移和斜率的初始估计，然后进行一个或多个信息符号的序列的所有可能值的假设。 对于每个所述假设，相关联的数据符号序列用于对偏移和斜率进行改进的估计，并且针对每个假设存储改进的偏移和斜率估计。 对于每个假设，在计算预期信号值时使用改进的偏移和斜率估计，并且计算调制信号的样本与期望值之间的失配。 然后将假设顺序地扩展一个符号，斜率和偏移估计被更新，并且不匹配被累积以形成每个扩展假设的路径度量值，并且基于使用维特比序列最大似然的所述路径量度值来解析所述假设 序列估计过程，以产生基本上不受所述相加斜率和偏移量影响的所述调制信息符号的最可能假设。

公开(公告)号：US5568518A

公开(公告)日：1996-10-22

申请号：US305651

申请日：1994-09-14

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/01 ,  H03G3/20 ,  H03M13/23 ,  H04L25/03 ,  H04L25/08 ,  H04L25/30 ,  H04L27/06

CPC分类号： H03G3/3078 ,  H04L25/03248 ,  H04L25/03273

摘要： A method for demodulating or decoding a digitally modulated data signal is disclosed wherein AGC parameters are retain and update or discard in parallel with deciding the data patterns most likely to have been transmitted. First, the received signals are converted from analog to digital to obtain numerical signal samples. The numerical signal samples are then compared with sample values expected for each of a number of possible symbol sequences using a scaling factor associated with each of the symbol sequences in order to determine a mismatch value for each sequence. The mismatch values are then logically self-consistent. Then, the lowest cumulative mismatch value is chosen from among all the foregoing sequences that can logically precede a new sequence to be accumulated with the mismatch value from the new sequence, wherein the selected mismatch identifies a best predecessor sequence. The scaling factor associated with the best predecessor is then chosen and the scaling factor is updated to obtain the scaling factor to be associated with the new sequence.

摘要翻译： 公开了一种用于解调或解码数字调制数据信号的方法，其中AGC参数被保留并且与决定最可能被发送的数据模式并行更新或丢弃。 首先，将接收的信号从模拟转换为数字，以获得数字信号样本。 然后将数字信号样本与使用与每个符号序列相关联的缩放因子的多个可能符号序列中的每一个的预期样本值进行比较，以便确定每个序列的不匹配值。 然后，不匹配值在逻辑上是自相矛盾的。 然后，从可以从新序列中与不匹配值累积的新序列逻辑上先于所有上述序列中选择最低累积失配值，其中所选择的不匹配识别最佳前导序列。 然后选择与最佳前辈相关联的缩放因子，并更新比例因子以获得与新序列相关联的缩放因子。

公开(公告)号：US5537419A

公开(公告)日：1996-07-16

申请号：US106260

申请日：1993-08-13

申请人： Michael I. Parr ,  John L. Watson ,  T. G. Vishwanath

发明人： Michael I. Parr ,  John L. Watson ,  T. G. Vishwanath

IPC分类号： H04Q7/38 ,  H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H03M13/23 ,  H04B3/04 ,  H04B7/005 ,  H04B7/26 ,  H04L7/02 ,  H04L25/02 ,  H04L25/03 ,  H04L25/08 ,  H04L25/30 ,  H04L27/00 ,  H04L27/01 ,  H04L7/08

CPC分类号： H04L25/03248 ,  H04L25/025 ,  H04L2027/0065 ,  H04L25/03273 ,  H04L25/03292

摘要： The present invention provides for sample timing adjustment using channel impulse response which is particularly well adapted for use in a receiver for digital cellular mobile telephones. The sample timing adjustment includes storing samples in time slots, generating estimates of the transmission channel impulse response, and using a subset of the samples received during the time slot, and generating error measurements of the degree to which the estimated channel impulse responses match the actual channel impulse responses. The different measures use simultaneously recorded samples having different time offsets. At least one sample used for each measure is advanced in time and one sample used for each measure is retarded in time relative to the samples used for generating the first measure. Then, a sample time setting that minimizes the error measurement is determined and the sampling is adjusted to reflect the newly determined sample time setting. Time-reversed operation further enhances performance and permits implementation with reasonable complexity for a standards compliant mobile receiver.

摘要翻译： 本发明提供使用信道脉冲响应的采样定时调整，其特别适用于用于数字蜂窝移动电话的接收机。 采样定时调整包括在时隙中存储采样，产生传输信道脉冲响应的估计，以及使用在该时隙期间接收到的样本的子集，以及产生所估计的信道脉冲响应与实际值相匹配的程度的误差测量 通道脉冲响应。 不同的措施同时使用具有不同时间偏移量的记录样本。 用于每个测量的至少一个样本在时间上提前，并且用于每个测量的一个样本在时间上相对于用于生成第一测量的样本被延迟。 然后，确定使误差测量最小化的采样时间设置，并且调整采样以反映新确定的采样时间设置。 时间反转操作进一步增强了性能，并允许对符合标准的移动接收机具有合理复杂性的实现。