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1.发明授权Error screening based on code and control information consistency in a communication system 有权基于通信系统中代码和控制信息一致性的错误筛选公开(公告)号：US06662339B1
公开(公告)日：2003-12-09
申请号：US09464042
申请日：1999-12-15
IPC分类号： G06F1100
摘要： Improved error screening techniques are used in processing digital audio or other types of information received in a digital communication system. Control information associated with a given packet of the received information is identified and compared with a decoding requirement of the packet, in order to control the generation of an error indicator for the packet. More particularly, the error indicator may be generated in response to an inconsistency between the control information and the decoding requirement. For example, the control information may include an indication of packet length that can be compared to a number of bits required to decode the corresponding packet, with any inconsistency between the packet length indication and the number of required bits leading to the generation of an error flag for the packet. The invention is particularly well-suited for use in the processing of encoded digital audio information received in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system, but is also applicable to other types of information and other types of communication systems.
摘要翻译： 改进的错误筛选技术用于处理在数字通信系统中接收的数字音频或其他类型的信息。 与所接收信息的给定分组相关联的控制信息被识别并与分组的解码要求进行比较，以便控制分组的错误指示符的生成。 更具体地，可以响应于控制信息和解码要求之间的不一致而产生错误指示符。 例如，控制信息可以包括可以与解码对应分组所需的位数比较的分组长度的指示，分组长度指示与导致产生错误的所需比特数之间的任何不一致 标志为数据包。 本发明特别适用于处理在混合带内通道（HIBOC）数字音频广播（DAB）系统中接收的编码数字音频信息，但也适用于其他类型的信息和其他类型 的通信系统。
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2.发明授权公开(公告)号：US06430724B1
公开(公告)日：2002-08-06
申请号：US09322848
申请日：1999-05-28
IPC分类号： H03M1300
CPC分类号： H04L1/0045 , H04H20/30 , H04H60/11 , H04H2201/183 , H04H2201/186 , H04H2201/20 , H04L1/0059 , H04L1/0068 , H04L1/0071 , H04L27/2647
摘要： Techniques for processing received information in a communication system, such that performance is significantly improved in the presence of certain types of interference. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of an FM or AM host carrier signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The compressed digital audio information in the sidebands is encoded using an outer code, e.g., a cyclic redundancy code (CRC), and an inner code, e.g., a complementary punctured pair convolutional (CPPC) code. A receiver generates an error indicator based at least in part on a first decoding of the received information. The error indicator characterizes interference associated with at least one of the digital sidebands. The receiver then generates at least one alternative decoding of the received information if the error indicator has a designated characteristic. For example, the receiver may generate the alternative decoding by eliminating from consideration in the receiver decoding process a designated portion of at least one of the digital sidebands. The error indicator may be indicative of the presence or absence of a first adjacent interference signal of a particular level within a frequency band associated with one of the sidebands, and may be based on, e.g., a signal-to-noise ratio measurement generated from a pilot tone associated with a given sideband, and/or an error flag generated using the CRC outer code. Portions of the given sideband may be eliminated from consideration via successive erasures of sideband components, i.e., subbands, thereby resulting in an increase in the effective code rate of the inner code.
摘要翻译： 用于在通信系统中处理接收到的信息的技术，使得在存在某些类型的干扰的情况下，性能得到显着提高。 在说明性实施例中，在混合带内通道（HIBOC）数字音频广播（DAB）系统中，在FM或AM主机载波信号的任一侧上发送第一和第二数字边带。 边带中的压缩数字音频信息使用外码（例如，循环冗余码（CRC））和内码（例如，互补打孔对卷积码（CPPC）码）进行编码。 接收器至少部分地基于所接收的信息的第一解码来生成错误指示符。 错误指示器表征与至少一个数字边带相关联的干扰。 如果错误指示符具有指定的特征，则接收器然后生成接收到的信息的至少一个替代解码。 例如，接收机可以通过在接收机解码处理中考虑至少一个数字边带的指定部分来产生替代解码。 误差指示符可以指示在与一个边带相关联的频带内的特定电平的第一相邻干扰信号的存在或不存在，并且可以基于例如从...产生的信噪比测量 与给定边带相关联的导频音和/或使用CRC外码生成的错误标志。 可以通过边带分量即子带的连续擦除来考虑给定边带的一部分，从而导致内码的有效码率的增加。
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公开(公告)号：US06874115B1
公开(公告)日：2005-03-29
申请号：US09632423
申请日：2000-08-04
IPC分类号： H03M13/00
CPC分类号： H03M13/6511 , H03M13/00
摘要： Techniques are disclosed for processing received information in a communication system, such that performance is significantly improved in the presence of certain types of interference, e.g., partial-band interference. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of an AM or FM host carrier signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The compressed digital audio information in the sidebands is encoded using an error correcting code such as a Reed-Solomon (RS) code. A receiver attempts to detect interference within a designated portion of a given one of the sidebands. If the interference is detected, the receiver eliminates the portion of the frequency band from consideration in the decoding process by using a fixed-erasure decoding (FED) technique to decode the error correcting code. If the interference is not detected, the receiver utilizes the designated portion of the sideband in the decoding process by using a hard-decision decoding (HDD) technique. Advantageously, this multi-mode approach of the present invention provides significantly reduced complexity relative to conventional maximum likelihood decoding, and also provides a block error flag for use in error concealment in an audio decoder. In addition, the invention provides improved performance relative to conventional systems in terms of reducing the probability that a block error flag will be generated, while also providing a manageable probability of undetected errors.
摘要翻译： 公开了用于在通信系统中处理接收到的信息的技术，使得在某些类型的干扰（例如，部分频带干扰）的存在下，性能被显着改善。 在说明性实施例中，第一和第二数字边带在混合带内通道（HIBOC）数字音频广播（DAB）系统中的AM或FM主载波信号的任一侧上发送。 使用诸如里德 - 所罗门（RS）码的纠错码对边带中的压缩数字音频信息进行编码。 接收机尝试检测给定一个边带的指定部分内的干扰。 如果检测到干扰，则接收器通过使用固定消息解码（FED）技术来解码纠错码来消除解码过程中考虑的频带部分。 如果没有检测到干扰，则通过使用硬判决解码（HDD）技术，接收机在解码过程中利用边带的指定部分。 有利地，本发明的这种多模式方法相对于传统的最大似然解码提供显着降低的复杂度，并且还提供用于音频解码器中的错误隐藏的块错误标志。 此外，本发明提供了相对于常规系统的改进的性能，以减少将产生块错误标志的可能性，同时还提供未被发现的错误的可管理概率。
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4.发明授权Channel code configurations for digital audio broadcasting systems and other types of communication systems 有权数字音频广播系统和其他类型通信系统的频道码配置公开(公告)号：US06587826B1
公开(公告)日：2003-07-01
申请号：US09464043
申请日：1999-12-15
IPC分类号： G10L2104
CPC分类号： H04L1/0065 , H04L1/004 , H04L1/0071 , H04L1/0078
摘要： Improved channel code configurations for use in transmission of digital audio or other types of information in a digital communication system. The channel code may include an outer channel code, e.g., a cyclic redundancy code (CRC), and an inner channel code, e.g., a complementary punctured pair convolutional (CPPC) code. In accordance with the invention, multiple code words of the outer code are associated with a given packet of the digital information, in accordance with a particular outer code configuration, so as to provide partial error flagging for different portions of the given packet. An information encoder, e.g., a PAC encoder, interacts with an outer code encoder to determine a bit allocation for transmission of packets at a particular bit rate, based at least in part on the outer code configuration. The invention is particularly well-suited for use in the transmission of digital audio information in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system, but is also applicable to other types of communication systems.
摘要翻译： 用于在数字通信系统中传输数字音频或其他类型的信息的改进的信道码配置。 信道码可以包括外部信道码，例如循环冗余码（CRC）和内部信道码，例如互补的穿孔对卷积码（CPPC）码。 根据本发明，根据特定的外部代码配置，外部代码的多个代码字与数字信息的给定分组相关联，以便为给定分组的不同部分提供部分错误标记。 信息编码器，例如PAC编码器，与外码编码器交互，以至少部分地基于外码配置来确定用于以特定比特率传输分组的比特分配。 本发明特别适用于在混合带内通道（HIBOC）数字音频广播（DAB）系统中传输数字音频信息，但也适用于其他类型的通信系统。
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5.发明授权Technique for effectively communicating multiple digital representations of a signal 有权用于有效传达信号的多个数字表示的技术公开(公告)号：US06430401B1
公开(公告)日：2002-08-06
申请号：US09280280
申请日：1999-03-29
IPC分类号： H04B102
CPC分类号： H04H20/30 , H04H60/07 , H04H2201/186
摘要： In a communications system implementing, e.g., an in-band on channel AM (IBOC-AM) (also known as “hybrid IBOC-AM”) scheme, multiple bit streams are used to represent an audio signal to be transmitted over one or more frequency bands including, e.g., parts of an AM frequency band for radio broadcast. These bit streams contain various and/or equivalent amounts of audio information. In an illustrative embodiment, at least one of the bit streams is a core bit stream containing core audio information. The remaining bit streams are enhancement bit streams containing enhancement audio information. The core bit stream is necessary for recovering the audio signal with minimal acceptable quality. Such quality is enhanced when the core bit stream, together with one or more of the enhancement bit streams, is used to recover the audio signal. In accordance with the invention, the AM frequency band is divided into subbands. Each of the core and enhancement bit streams is assigned to a respective one of the subbands for transmission. The assignment is conducive to an effective treatment of interference affecting the IBOC-AM system. Other embodiments may include, e.g., communications of the multiple bit streams in accordance with the invention in an IBOC-FM system, a satellite broadcasting system, etc.
摘要翻译： 在实现例如带内频道AM（IBOC-AM）（也称为“混合IBOC-AM”）方案的通信系统中，使用多个比特流来表示将通过一个或多个 频带包括例如用于无线电广播的AM频带的部分。 这些比特流包含各种和/或等量的音频信息。 在说明性实施例中，至少一个比特流是包含核心音频信息的核心比特流。 剩余的比特流是包含增强音频信息的增强比特流。 核心比特流对于以最小可接受的质量恢复音频信号是必需的。 当使用核心比特流以及一个或多个增强比特流来恢复音频信号时，这种质量得到增强。 根据本发明，AM频带被划分成子带。 核心和增强比特流中的每一个分配给相应的一个子带用于传输。 这项任务有利于对影响IBOC-AM系统的干扰的有效处理。 其他实施例可以包括例如根据本发明在IBOC-FM系统，卫星广播系统等中的多个比特流的通信
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6.发明授权公开(公告)号：US06378101B1
公开(公告)日：2002-04-23
申请号：US09238137
申请日：1999-01-27
IPC分类号： H03M1329
CPC分类号： H04L1/0083 , H04H2201/186 , H04L1/0047 , H04L1/0054 , H04L1/0065 , H04L1/007 , H04L1/0071 , H04L1/08
摘要： Methods and apparatus for decoding multiple program information, e.g., audio, video or image information, in a communication system are disclosed. In an illustrative embodiment, a multiple program decoder includes a deinterleaver for deinterleaving information corresponding to a set of frames, using a specified deinterleaving length. A given one of the frames includes information from each of at least a subset of the programs, and the frames are encoded using an outer code, e.g., a CRC code, RS code, BCH code or other type of linear block code, and an inner code, e.g., a convolutional code, turbo code or trellis coded modulation. The multiple program decoder includes an inner code decoder for decoding the inner code over one or more of the programs, and an outer code decoder for decoding the outer code for a selected one of the programs. The deinterleaving length of the deinterleaver and operating rate of the inner code decoder can be configured such that the multiple program decoder provides substantially instantaneous tuning within a given cluster of programs, or within a set of clusters each including multiple programs. The programs may, but need not, include jointly-coded audio programs. The invention may be implemented in numerous applications, such as simultaneous multiple program listening and/or recording, simultaneous delivery of audio and data, etc.
摘要翻译： 公开了在通信系统中解码多个节目信息（例如音频，视频或图像信息）的方法和装置。 在说明性实施例中，多程序解码器包括去交织器，用于使用指定的去交织长度对与一组帧相对应的信息进行解交织。 给定的一个帧包括来自节目的至少一个子集中的每一个的信息，并且使用外部代码（例如，CRC码，RS码，BCH码或其他类型的线性块码）来编码帧，并且 内部码，例如，卷积码，turbo码或网格编码调制。 多重节目解码器包括用于通过一个或多个节目对内部码进行解码的内部码解码器，以及用于解码所选择的一个节目的外部码的外部码解码器。 解码器的解交织长度和内码解码器的操作速率可以被配置为使得多程序解码器在给定的程序集群内或在包括多个程序的一组集群内提供基本上即时的调谐。 程序可以但不必包括联合编码的音频节目。 本发明可以在许多应用中实现，例如同时多节目收听和/或记录，同时传送音频和数据等。
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公开(公告)号：US6105158A
公开(公告)日：2000-08-15
申请号：US54677
申请日：1998-04-03
CPC分类号： H03M13/6502 , H03M13/09 , H03M13/23 , H03M13/4115 , H03M13/413
摘要： For a transmission system in which (a) a received sequence of symbols is processed by an inner decoder followed by an outer decoder and (b) the inner decoder is capable of providing to the outer decoder more than one output sequence corresponding to the received sequence, the decoded sequence released by the outer decoder is screened for errors undetected by the outer decoder, if a predetermined criterion is satisfied.
摘要翻译： 对于传输系统，其中（a）接收的符号序列由内部解码器跟随外部解码器处理，并且（b）内部解码器能够向外部解码器提供多于一个对应于所接收序列的输出序列 如果满足预定标准，则由外部解码器释放的解码序列被筛选出不被外部解码器检测到的错误。
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公开(公告)号：US07359313B2
公开(公告)日：2008-04-15
申请号：US10178923
申请日：2002-06-24
IPC分类号： H04J11/00
CPC分类号： H04L1/005 , H04L1/0055 , H04L1/0071 , H04L1/0618 , H04L25/03171 , H04L25/067 , H04L27/22 , H04L27/38 , H04L2025/03414 , H04L2025/0342 , H04L2025/03426
摘要： A system employs space-time coding characterized at the transmitter by bit-interleaved coded modulation (BICM) combined with multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) modulation. Space-Time coding techniques improve transmission efficiency in radio channels by using multiple transmit and/or receive antennas and coordination of the signaling over these antennas. Bit-interleaved coded modulation provides good diversity gain with higher-order modulation schemes that employ binary convolutional codes. OFDM modulation allows for wideband transmission over frequency selective radio channels. A receiver demodulates the OFDM signal and applies multi-input, multi-output (MIMO) demapping to estimate the BICM encoded bitstream. After deinterleaving of the BICM encoded bitstream, maximum a posteriori (MAP) decoding is applied to the resulting bit stream to generate soft output values. The MIMO demapping and MAP decoding processes exchange likelihood information to improve the bit error rate performance over several iterations of demapping/decoding. By applying well-known turbo-decoding principles to iteratively demap and decode, the overall receiver performance is significantly improved.
摘要翻译： 一种系统采用通过与多载波正交频分复用（OFDM）调制组合的比特交织编码调制（BICM）在发射机上表征的时空编码。 空时编码技术通过使用多个发射和/或接收天线以及通过这些天线协调信令来提高无线电信道中的传输效率。 位交织编码调制通过采用二进制卷积码的高阶调制方案提供了良好的分集增益。 OFDM调制允许通过频率选择性无线电信道进行宽带传输。 接收机解调OFDM信号并应用多输入多输出（MIMO）解映射来估计BICM编码比特流。 在对BICM编码的比特流进行解交织之后，对得到的比特流应用最大后验（MAP）解码以产生软输出值。 MIMO解映射和MAP解码处理交换似然信息，以在多次重映射/解码的迭代中提高误码率性能。 通过应用众所周知的turbo解码原理进行迭代解映射和解码，整体接收机性能得到显着提高。
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9.发明授权Reduced complexity receiver for space-time- bit-interleaved coded modulation 有权用于空时位交织编码调制的复杂度降低的接收机公开(公告)号：US07095812B2
公开(公告)日：2006-08-22
申请号：US10178922
申请日：2002-06-24
CPC分类号： H04L1/0055 , H04L1/005 , H04L1/0071 , H04L1/0631 , H04L25/03171 , H04L25/067 , H04L27/22 , H04L27/38 , H04L2025/03414 , H04L2025/0342 , H04L2025/03426
摘要： A system employs space-time coding characterized at the transmitter by bit-interleaved coded modulation (BICM) combined with modulating several streams of the BICM encoded data for transmission over two or more antennas. Space-time coding techniques improve transmission efficiency in radio channels by using multiple transmit and/or receive antennas and coordination of the signaling over these antennas. Bit-interleaved coded modulation provides good diversity gain with higher-order modulation schemes that employ binary convolutional codes. A receiver demodulates the received signals and applies multi-input, multi-output (MIMO) demapping to estimate the BICM encoded bitstream. After deinterleaving of the BICM encoded bitstream, maximum a posteriori (MAP) decoding is applied to the resulting bit stream to generate soft output values. By applying well-known turbo-decoding principles to iteratively demap and decode, the overall receiver performance is significantly improved. The MIMO demapping and MAP decoding processes exchange likelihood information to improve the bit error rate performance over several iterations of demapping/decoding. By generating tentative decisions for transmitted bits, the overall number of evaluations used for demapping may be reduced.
摘要翻译： 系统采用空间时间编码，其特征在于发射机采用与BICM编码数据调制的数个流相结合的比特交织编码调制（BICM），以便在两个或多个天线上进行传输。 空时编码技术通过使用多个发射和/或接收天线以及通过这些天线协调信令来提高无线电信道中的传输效率。 位交织编码调制通过采用二进制卷积码的高阶调制方案提供了良好的分集增益。 接收机解调接收到的信号并应用多输入多输出（MIMO）解映射来估计BICM编码比特流。 在对BICM编码的比特流进行解交织之后，对得到的比特流应用最大后验（MAP）解码以产生软输出值。 通过应用众所周知的turbo解码原理进行迭代解映射和解码，整体接收机性能得到显着提高。 MIMO解映射和MAP解码处理交换似然信息，以在多次重映射/解码的迭代中提高误码率性能。 通过产生传输比特的暂定决定，可以减少用于解映射的评估的总数。
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公开(公告)号：US06768778B1
公开(公告)日：2004-07-27
申请号：US09217655
申请日：1998-12-21
IPC分类号： H04L512
CPC分类号： H04H20/30 , H04H2201/20 , H04L1/0059 , H04L1/0069 , H04L1/007
摘要： The invention provides optimal complementary punctured convolutional codes for coding information bits in a communication system. In an illustrative embodiment, an optimal pair of complementary punctured codes is selected from a set of potential code pairs. The set of potential code pairs includes all non-catastrophic complementary punctured code pairs which combine to produce to a specified full-bandwidth code, and thus includes both equivalent and non-equivalent complementary codes. The optimal code pair may be selected, for example, as the pair of equivalent or non-equivalent codes which has the best free Hamming distance and minimum information error weight of all the pairs in the set. In addition, the invention provides both rate-compatible and rate-incompatible codes suitable for use in providing unequal error protection (UEP) for different classes of information bits. The invention further provides optimal bit assignment techniques for use in digital audio broadcasting or other applications in which digital information is transmitted on subcarriers in both an upper and a lower sideband of an analog carrier.
摘要翻译： 本发明提供了用于在通信系统中对信息比特进行编码的最佳互补穿孔卷积码。 在说明性实施例中，从一组潜在代码对中选择最佳的互补穿孔码对。 潜在代码对集合包括组合产生到指定的全带宽代码的所有非灾难性互补穿孔码对，并且因此包括等效和非等效的互补码。 可以选择最佳代码对，例如，作为组中所有对的最佳空闲汉明距离和最小信息误差权重的等效或非等效代码对。 此外，本发明提供适用于为不同类别的信息比特提供不等差错保护（UEP）的速率兼容和速率不兼容的代码。 本发明还提供了用于数字音频广播或数字信息在模拟载波的上边带和下边带中的子载波上发送的其他应用中的最佳比特分配技术。
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