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公开(公告)号：US07564892B1
公开(公告)日：2009-07-21
申请号：US10611400
申请日：2003-06-30
申请人： Mats Lidstrom , Lior Levin , Abraham Krieger
发明人： Mats Lidstrom , Lior Levin , Abraham Krieger
IPC分类号： H04B3/36
CPC分类号： H04B1/18 , H04N21/2383 , H04N21/4382
摘要： A transcoder is described for converting a received first digital signal with a first modulation and encoding scheme to a second digital signal with a second modulation and encoding scheme. The transcoder may include a demodulator that produces a demodulated digital stream of data from the received first digital signal and a modulator in signal communication with the demodulator, where the modulator modulates the digital stream of data with the second modulation and encoding scheme. Additionally, the transcoder may include an upconverter in signal communication with the modulator, where the upconverter produces the second digital signal.
摘要翻译： 描述了一种代码转换器，用于利用第二调制和编码方案将接收到的具有第一调制和编码方案的第一数字信号转换为第二数字信号。 代码转换器可以包括解调器，其从接收到的第一数字信号产生解调的数字数据流，以及调制器与解调器进行信号通信，其中调制器利用第二调制和编码方案对数字数据流进行调制。 此外，代码转换器可以包括与调制器进行信号通信的上变频器，其中上变频器产生第二数字信号。
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2.发明授权Efficient communication system for reliable frame transmission over broad SNR ranges 失效高效的通信系统，用于在宽SNR范围内进行可靠的帧传输公开(公告)号：US07336683B1
公开(公告)日：2008-02-26
申请号：US10464361
申请日：2003-06-17
IPC分类号： H04J3/00
CPC分类号： H04B7/18595 , H04L1/0089
摘要： An exemplary satellite communication system comprises a service provider unit communicably coupled to a number of subscriber units via satellite transmission. The service provider unit includes an encoder configured to encode source data into a serial transmit sequence, and is further capable of supporting at least two modes of operation. The serial transmit sequence includes a first unique word identifying a first mode of operation, and is followed by a first payload packet having a first number of channel symbols corresponding to a source packet encoded in accordance with the first mode of operation identified by the first unique word. The first payload packet is encapsulated by two unique words and the time interval between the two unique words is used to determine the first mode of operation identified by the first unique word.
摘要翻译： 示例性卫星通信系统包括通过卫星传输可通信地耦合到多个用户单元的服务提供商单元。 服务提供商单元包括被配置为将源数据编码为串行发送序列的编码器，并且还能够支持至少两种操作模式。 串行发送序列包括识别第一操作模式的第一唯一字，并且后面是第一有效载荷分组，其具有对应于根据由第一唯一的第一唯一标识的第一操作模式编码的源分组的第一数量的信道符号 字。 第一个有效载荷包被两个唯一字封装，并且两个唯一字之间的时间间隔用于确定由第一个唯一字识别的第一操作模式。
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公开(公告)号：US06856656B2
公开(公告)日：2005-02-15
申请号：US09729652
申请日：2000-12-04
CPC分类号： H04L1/005 , H04L1/0066 , H04L27/22 , H04L2027/003 , H04L2027/0055 , H04L2027/0067
摘要： An iterative system for performing carrier phase tracking of symbols using a serial turbo decoder. Estimates of a buffered block of symbols are provided by a serial turbo decoder. Optionally, reliability metrics for the estimates are provided as well. Responsive to this information, a tracking loop module determines derotation phases for each of the symbols in the buffer. A symbol derotator derotates each of the buffered symbols in the block by its corresponding derotation phase. The derotated symbols are stored back in the buffer. The process may repeat itself for a prescribed number of iterations, after which the serial turbo decoder provides estimates of the underlying source bits.
摘要翻译： 用于使用串行turbo解码器执行符号的载波相位跟踪的迭代系统。 缓冲符号块的估计由串行turbo解码器提供。 可选地，也提供估计的可靠性度量。 响应于该信息，跟踪循环模块确定缓冲器中每个符号的解旋相位。 符号解旋器通过其对应的解旋阶段来解除块中的每个缓冲符号。 被解码的符号被存储在缓冲区中。 该过程可以重复其规定次数的迭代，之后串行turbo解码器提供基础源比特的估计。
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4.发明授权Iteractive decoder employing multiple external code error checks to lower the error floor 有权采用多次外部代码错误检查的迭代解码器来降低错误层数公开(公告)号：US06810502B2
公开(公告)日：2004-10-26
申请号：US09865958
申请日：2001-05-25
IPC分类号： H03M1303
CPC分类号： H04L1/005 , H03M13/09 , H03M13/15 , H03M13/2936 , H03M13/2948 , H03M13/2972 , H03M13/3776 , H03M13/3994 , H04L1/0054 , H04L1/0061 , H04L1/0065 , H04L1/0066
摘要： Iterative decoder employing multiple external code error checks to lower the error floor and/or improve decoding performance. Data block redundancy, sometimes via a cyclic redundancy check (CRC) or Reed Solomon (RS) code, enables enhanced iterative decoding performance. Improved decoding performance is achieved during interim iterations before the final iteration. A correctly decoded CRC block, indicating a decoded segment is correct with a high degree of certainty, assigns a very high confidence level to the bits in this segment and is fed back to inner and/or outer decoders (with interleaving, when appropriate) for improved iterative decoding. High confidence bits may be scattered throughout inner decoded frames to influence other bit decisions in subsequent iterations. Turbo decoders typically operate relatively well at regions where the BER is high; the invention improves iterative decoder operation at lower BERs, lowering the ‘BER floor’ that is sometimes problematic with conventional turbo decoders.
摘要翻译： 迭代解码器采用多个外部码错误检查来降低错误帧和/或提高解码性能。 有时通过循环冗余校验（CRC）或Reed Solomon（RS）代码进行数据块冗余，可实现增强的迭代解码性能。 在最终迭代之前的中间迭代期间，可以实现改进的解码性能。 一个正确解码的CRC块，指示解码的段是高度确定的正确的，为该段中的位分配非常高的置信度水平，并将其反馈给内部和/或外部解码器（适当时进行交织），以便 改进的迭代解码。 高置信位可能散布在整个内部解码帧中，以影响后续迭代中的其他位决策。 Turbo解码器通常在BER高的区域相对较好地工作; 本发明改进了在较低BER下的迭代解码器操作，降低了常规turbo解码器有时成问题的“BER地面”。
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5.发明授权System for carrier phase tracking of coded symbols using reliability metrics for symbol estimates 有权使用符号估计的可靠性度量的编码符号的载波相位跟踪系统公开(公告)号：US06795512B1
公开(公告)日：2004-09-21
申请号：US09715877
申请日：2000-11-17
IPC分类号： H04L2706
CPC分类号： H04L25/067 , H04L1/0054 , H04L1/0055 , H04L25/025 , H04L2025/03598
摘要： A system for carrier phase tracking of symbols. In an embodiment employing a feedback structure, a symbol derotator pre-rotates a symbol by a derotation phase. A symbol and reliability estimation engine provides, responsive to the pre-rotated symbol, an estimate of the symbol and a reliability metric for the estimate. A tracking loop module determines a residual between the pre-rotated symbol and the symbol estimate, weights the residual by the reliability metric for the estimate, and determines a phase offset estimate responsive to the weighted residual. An accumulator then determines a next derotation phase responsive to the phase offset estimate. In an embodiment employing a feedforward structure, a symbol and reliability estimation engine provides an estimate of a symbol and a reliability metric for the estimate. A tracking loop module determines a residual between the symbol and the symbol estimate, weights the residual by the reliability metric for the estimate, and determines a derotation phase responsive to the weighted residual.
摘要翻译： 符号载波相位跟踪系统。 在采用反馈结构的实施例中，符号解旋器通过解旋相预先旋转符号。 符号和可靠性估计引擎响应于预旋转符号提供符号的估计和估计的可靠性度量。 跟踪环模块确定预旋转符号和符号估计之间的残差，将残差加权用于估计的可靠性度量，并且响应于加权残差确定相位偏移估计。 然后，累加器确定响应于相位偏移估计的下一个解旋相位。 在采用前馈结构的实施例中，符号和可靠性估计引擎提供用于估计的符号估计和可靠性度量。 跟踪循环模块确定符号和符号估计之间的残差，将残差加权估计的可靠性度量，并根据加权残差确定解旋相位。
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公开(公告)号：US08065593B2
公开(公告)日：2011-11-22
申请号：US12781749
申请日：2010-05-17
申请人： Chi-Ping Nee , Abraham Krieger , Shachar Kons , Chun-Hsuan Kuo
发明人： Chi-Ping Nee , Abraham Krieger , Shachar Kons , Chun-Hsuan Kuo
IPC分类号： H03M13/00
CPC分类号： H03M13/2936 , H03M13/2732 , H03M13/293
摘要： An erasures assisted block code decoder and related method are provided. The erasures assisted block code decoder includes a first block decoder, an erasures processor, and a second block code decoder. The first block decoder, for example, a Reed-Solomon decoder, is configured to decode blocks of data elements, e.g., bytes, that were previously affected by bursty errors. The first block decoder is also configured to identify those of such blocks it is unable to decode. The erasures processor is configured to identify, as erasures, data elements in the un-decodable blocks by utilizing, in the erasures identification process, data elements in the decoded blocks that were corrected by the first block decoder. The second block decoder, e.g., the same or different Reed-Solomon decoder, is configured to decode one or more of the un-decodable blocks by utilizing, in the decoding, the erasures identified by the erasures processor.
摘要翻译： 提供了一种擦除辅助块代码解码器及相关方法。 擦除辅助块码解码器包括第一块解码器，擦除处理器和第二块码解码器。 第一块解码器，例如Reed-Solomon解码器，被配置为对先前受突发错误影响的诸如字节的数据元素块进行解码。 第一块解码器还被配置为识别其不能解码的这些块的那些。 擦除处理器被配置为通过在擦除识别处理中利用由第一块解码器校正的解码块中的数据元素来识别不可解码块中的数据元素作为擦除。 第二块解码器，例如相同或不同的里德 - 所罗门解码器，被配置为通过在解码中利用由擦除处理器识别的擦除来解码一个或多个不可解码块。
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公开(公告)号：US07310369B1
公开(公告)日：2007-12-18
申请号：US09870926
申请日：2001-05-30
CPC分类号： H04L1/20 , H04B17/26 , H04B17/336 , H04L1/0054 , H04L1/0055
摘要： A method for estimating an SNR-related parameter, such as ES/N0, from one or more symbols. The number of symbols within a predetermined number of symbols that fall within one or more collection areas is counted. The count is then associated with a value of the SNR-related parameter. This association may be performed through one or more lookup tables. In one application, a scaling factor is derived from the count. The scaling factor may be used to scale symbols before they are quantized and inputted into a trellis decoder such as a log-MAP decoder.
摘要翻译： 一种用于从一个或多个符号估计SNR相关参数的方法，例如E / S / N 0 0。 计数落入一个或多个收集区域内的预定数量的符号内的符号数。 然后计数与SNR相关参数的值相关联。 该关联可以通过一个或多个查找表来执行。 在一个应用中，从计数导出缩放因子。 比例因子可以在量化之前对符号进行缩放并输入到诸如log-MAP解码器的网格解码器中。
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公开(公告)号：US07103831B1
公开(公告)日：2006-09-05
申请号：US10350303
申请日：2003-01-22
IPC分类号： H03M13/00
CPC分类号： H03M13/4169 , H03M13/2936 , H03M13/4138
摘要： A method and system are described for assigning reliability metrics to error correction coded bits or symbols that are decoded. Survivor and non-survivor paths through a portion of a trellis representation within a sliding window are determined and recorded. Primary and non-primary traceback paths through a portion of the trellis representation are determined from the recorded data. If the primary and non-primary traceback paths diverge at a release point, a reliability metric is assigned to the bit or symbol estimate corresponding to the release point. This metric is derived from the difference between the path metrics of the primary and non-primary traceback paths. Alternately, if the two paths diverge through all or a portion of a release zone, a reliability metric is assigned to the block of bit or symbol estimates corresponding to the portion or more of the release zone where the two paths diverge from one another. Again, this metric is derived from the difference between the path metrics of the primary and non-primary traceback paths.
摘要翻译： 描述了用于将可靠性度量分配给被解码的纠错编码比特或符号的方法和系统。 确定并记录通过滑动窗口内的网格表示的一部分的幸存者和非幸存者路径。 从记录的数据确定通过网格表示的一部分的主要和非主要回溯路径。 如果主要和非主要回溯路径在释放点发散，则将可靠性度量分配给与释放点相对应的位或符号估计。 该度量来源于主要和非主要回溯路径的路径度量之间的差异。 或者，如果两个路径分开通过释放区域的全部或一部分，则可靠性度量被分配给对应于两个路径彼此分开的释放区域的部分或更多个的位或符号估计块。 同样，该度量来源于主要和非主要回溯路径的路径度量之间的差异。
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9.发明授权Method and apparatus for decoding of a serially concatenated block and convolutional code 有权用于对串行级联块和卷积码进行解码的方法和装置公开(公告)号：US06606724B1
公开(公告)日：2003-08-12
申请号：US09492962
申请日：2000-01-28
IPC分类号： H03M1300
CPC分类号： H03M13/2972 , H03M13/09 , H03M13/15 , H03M13/2936 , H03M13/2948 , H03M13/3776 , H03M13/3994
摘要： A decoder having a first decoder providing first decoded data. A deinterleaver is included for deinterleaving the first decoded data. A second decoder provides second decoded data based on the deinterleaved first decoded data. The second decoder provides at least one decode status signal indicative of second decoder operations. A pipeline decoder unit is included that is coupled to the second decoder. The pipeline decoder unit includes an encoder that receives the second decoded data and provides forced decision data, a multiplexer, and a third decoder that provides pipelined decoded data. The multiplexer is responsive to the at least one decode status signal to selectively constrain the pipelined decoded data to be at least partially dependent on the forced decision data.
摘要翻译： 一种解码器，具有提供第一解码数据的第一解码器。 包含解交织器用于对第一解码数据进行解交织。 第二解码器基于去交织的第一解码数据提供第二解码数据。 第二解码器提供指示第二解码器操作的至少一个解码状态信号。 包括耦合到第二解码器的流水线解码器单元。 管线解码器单元包括接收第二解码数据并提供强制判定数据的编码器，多路复用器和提供流水线解码数据的第三解码器。 复用器响应于至少一个解码状态信号，以选择性地约束流水线解码的数据至少部分地取决于强制判定数据。
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10.发明授权
公开(公告)号：US5841817A
公开(公告)日：1998-11-24
申请号：US549565
申请日：1995-10-27
申请人： Abraham Krieger , Mark Kent
发明人： Abraham Krieger , Mark Kent
CPC分类号： H04L1/0059 , H04L27/22
摘要： The present invention provides an apparatus and method for signal recovery from noisy observation in digital communication systems, utilizing a forward estimator and data smoother which improves the quality of the estimates of the transmitted signal. The present invention also provides an apparatus and method for the application of the forward estimator to the recovery of a digital data stream modulated with a CPM waveform, through the use of a receiver for GMSK demodulation. The digital data is first processed using the Forward Estimation process which calculates the probability that a symbol is in particular states. Bit decision is then applied, followed by scaling. The present invention further provides an apparatus and method for the application of the forward estimator and data smoother to the decoding of digital data which has been encoded with a Convolutional code. The digital data is first processed using the Forward Estimation procedure and then smoothed and scaled. Bit decision is then applied.
摘要翻译： 本发明提供了一种利用正向估计器和数据平滑器在数字通信系统中的噪声观测信号恢复的装置和方法，其提高了所发射信号估计的质量。 本发明还提供了一种用于通过使用用于GMSK解调的接收机将前向估计器应用于用CPM波形调制的数字数据流的恢复的装置和方法。 首先使用前向估计过程来处理数字数据，该过程计算符号处于特定状态的概率。 然后应用位决定，然后进行缩放。 本发明还提供了一种用于将前向估计器和数据平滑器应用于已经用卷积码编码的数字数据的解码的装置和方法。 首先使用前向估计程序处理数字数据，然后进行平滑和缩放。 然后应用位决定。
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