公开(公告)号：US5708665A

公开(公告)日：1998-01-13

申请号：US701710

申请日：1996-08-22

申请人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

发明人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

IPC分类号： H04L1/00 ,  H04L1/20 ,  G06F11/00

CPC分类号： H04L1/0057 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/208

摘要： A communications receiver system is presented for detecting burst errors and providing erasure information to the block decoder (outer decoder), thereby effectively doubling the conventional correction capability of the block decoder with only a minimal increase in complexity. In one embodiment, this mechanism takes the form of a circuit which re-encodes the output of the inner decoder, compares it with the received sequence of code symbols, and flags a portion of the inner decoder output for erasure when an excessive number of code symbol errors are detected. In a second embodiment, this mechanism takes the form of a circuit which makes hard symbol decisions on the channel signal, compares the hard decisions to the channel signal to determine a noise level, and thereafter flags the channel output in regions with excessive noise levels.

摘要翻译： 提供了一种用于检测突发错误并向块解码器（外部解码器）提供擦除信息的通信接收机系统，从而仅以最小的复杂度增加来有效地加倍了块解码器的常规校正能力。 在一个实施例中，该机制采用电路的形式，其对内部解码器的输出进行重新编码，将其与所接收的代码符号序列进行比较，并且当过多数量的代码标记内部解码器输出的一部分以进行擦除 检测到符号错误。 在第二实施例中，该机制采用对信道信号进行硬符号决定的电路的形式，将硬判决与信道信号进行比较以确定噪声电平，此后在具有过高噪声电平的区域中标记信道输出。

公开(公告)号：US5926489A

公开(公告)日：1999-07-20

申请号：US754875

申请日：1996-11-22

申请人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

发明人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

IPC分类号： H03M13/00 ,  H03M13/15 ,  H03M13/27 ,  H04L1/00 ,  H04L1/20 ,  H03M13/22

CPC分类号： H04L1/0057 ,  H03M13/00 ,  H03M13/151 ,  H03M13/2703 ,  H04L1/0071

摘要： A communications receiver system is presented for detecting burst errors and providing erasure information to a block decoder, thereby effectively doubling the conventional correction capability of the block decoder with only a minimal increase in complexity. In one embodiment, the receiver includes a demodulator which includes circuitry to detect error bursts in the received symbol sequence. Once detected, the locations of symbols in error are marked in the form of erasure flags. An error correction decoder is then able to correct up to twice as many errors with the additional information provided by the erasure flags.

摘要翻译： 提出了一种用于检测突发错误并向块解码器提供擦除信息的通信接收机系统，从而仅以最小的复杂度增加来有效地加倍了块解码器的常规校正能力。 在一个实施例中，接收机包括解调器，其包括检测接收到的符号序列中的错误突发的电路。 一旦被检测到，错误的符号的位置被标记为擦除标志的形式。 然后纠错解码器能够利用擦除标志提供的附加信息来纠正多达两倍的错误。

公开(公告)号：US5812603A

公开(公告)日：1998-09-22

申请号：US701632

申请日：1996-08-22

申请人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

发明人： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

IPC分类号： H04L1/00 ,  H04L25/34

CPC分类号： H04L1/0057 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0071

摘要： A communications receiver system is presented for detecting burst errors and providing erasure information to the block decoder, thereby effectively doubling the conventional correction capability of the block decoder with only a minimal increase in complexity. In one embodiment, this mechanism takes the form of a circuit which re-encodes the output of the inner decoder, compares it with the received sequence of code symbols, and flags a portion of the inner decoder output for erasure when an excessive number of code symbol errors are detected. In a second embodiment, this mechanism takes the form of a circuit which makes hard symbol decisions on the channel signal, compares the hard decisions to the channel signal to determine a noise level, and thereafter flags the channel output in regions with excessive noise levels.

摘要翻译： 提出了一种用于检测突发错误并向块解码器提供擦除信息的通信接收机系统，从而以仅复杂度的最小增加有效地加倍了块解码器的传统校正能力。 在一个实施例中，该机制采用电路的形式，其对内部解码器的输出进行重新编码，将其与所接收的代码符号序列进行比较，并且当过多数量的代码标记内部解码器输出的一部分以进行擦除 检测到符号错误。 在第二实施例中，该机制采用对信道信号进行硬符号决定的电路的形式，将硬判决与信道信号进行比较以确定噪声电平，此后在具有过高噪声电平的区域中标记信道输出。

公开(公告)号：US06987543B1

公开(公告)日：2006-01-17

申请号：US09726819

申请日：2000-11-30

申请人： Advait M. Mogre ,  Dojun Rhee

发明人： Advait M. Mogre ,  Dojun Rhee

IPC分类号： H04N5/40 ,  H04L7/04

CPC分类号： H04L27/186 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/0069 ,  H04L1/0071 ,  H04N7/015 ,  H04N7/0806

摘要： A channel encoding system and a channel decoding system for use in transmitting multiple high definition television programs in a single satellite channel. The channel encoding system may comprise a frame formatter that may be configured to format a transport stream to produce a block stream. An error correction encoder may be configured to encode the block stream to produce an error protected block stream. An interleave module may be configured to interleave the error protected block stream to produce a data stream. A turbo encoder may be configured to encode the data stream to produce an encoded stream. A bit-to-symbol mapper may be configured to map the encoded stream to produce a symbol stream capable of at least eight different symbols. Finally, a modulator may be configured to modulate the symbol stream.

摘要翻译： 信道编码系统和用于在单个卫星信道中发送多个高清晰度电视节目的信道解码系统。 信道编码系统可以包括帧格式化器，其可以被配置为格式化传输流以产生块流。 纠错编码器可以被配置为对块流进行编码以产生错误保护的块流。 交织模块可以被配置为交错错误保护块流以产生数据流。 turbo编码器可以被配置为对数据流进行编码以产生编码的流。 位对符号映射器可以被配置为映射编码流以产生能够具有至少八个不同符号的符号流。 最后，调制器可以被配置成调制符号流。

公开(公告)号：US5996112A

公开(公告)日：1999-11-30

申请号：US785391

申请日：1997-01-21

申请人： Dariush Dabiri ,  Daniel A. Luthi ,  Advait M. Mogre

发明人： Dariush Dabiri ,  Daniel A. Luthi ,  Advait M. Mogre

IPC分类号： G06F11/10 ,  H03D1/00

CPC分类号： H03M13/4169 ,  H03M13/4192 ,  H04L1/0052 ,  H04L1/0054

摘要： This invention concerns a novel Viterbi decoding apparatus and method in which a survivor path unit (SPU) implements the traceback method with a RAM which stores path information in a manner which allows fast read access without requiring physical partitioning of the RAM. This results in an implementation that requires less chip area than conventional solutions.

摘要翻译： 本发明涉及一种新颖的维特比解码装置和方法，其中幸存路径单元（SPU）利用RAM来实现回溯方法，该RAM以允许快速读取访问的方式存储路径信息，而不需要RAM的物理划分。 这导致了与常规解决方案相比需要更少芯片面积的实现。

公开(公告)号：US6122325A

公开(公告)日：2000-09-19

申请号：US18602

申请日：1998-02-04

申请人： Advait M. Mogre ,  Dariush Dabiri ,  Shobana Swamy ,  Qian Cheng

发明人： Advait M. Mogre ,  Dariush Dabiri ,  Shobana Swamy ,  Qian Cheng

IPC分类号： H04L27/00 ,  H04L5/12

CPC分类号： H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0024

摘要： The invention provides a method and system for correcting imbalance in in-phase and quadrature components of a modulated received signal. The method includes assuming a signal imbalance to exist in the received signal, the signal imbalance having an amplitude imbalance and a phase imbalance, generating an amplitude imbalance correction factor and a phase imbalance correction factor to lessen the signal imbalance, and re-evaluating the amplitude and phase imbalance correction factors over a set of readings of the in-phase and quadrature components until the signal imbalance is minimized.

摘要翻译： 本发明提供一种用于校正调制接收信号的同相和正交分量中的不平衡的方法和系统。 该方法包括：假设信号不平衡存在于接收信号中，信号不平衡具有振幅不平衡和相位不平衡，产生幅度不平衡校正因子和相位不平衡校正因子以减小信号不平衡，并重新​​评估振幅 和相位不平衡校正因子超过一组同相和正交分量的读数，直到信号不平衡最小化为止。

公开(公告)号：US6101626A

公开(公告)日：2000-08-08

申请号：US18678

申请日：1998-02-04

申请人： Robert Morelos-Zaragoza ,  Advait M. Mogre

发明人： Robert Morelos-Zaragoza ,  Advait M. Mogre

IPC分类号： H03M13/00 ,  H03M13/23 ,  H03M13/25 ,  H03M13/41 ,  H04L1/00 ,  H03M13/03

CPC分类号： H04L1/006 ,  H03M13/23 ,  H03M13/25 ,  H03M13/41 ,  H03M13/6325 ,  H04L1/0052 ,  H04L1/0054 ,  H04L27/34 ,  H04L1/0068

摘要： The purpose of the present invention is to provide a method for choosing the coding schemes, mappings, and puncturing rates for a modulation/demodulation system which would allow the system to compensate for certain transformations of the code in a post-Viterbi step as opposed to pre-Viterbi. This would allow for faster and simpler decoding of a code. The method includes the steps of: choosing a coding scheme and puncturing rate; determining a code generator matrix using said coding scheme and puncturing rate; multiplying the code generator matrix by the transformation matrix by the code generator matrix's feedback free right inverse and seeing if the outcome is equal to the code generator matrix multiplied by the transform matrix; multiplying the error matrix by the code generator matrix's feedback free right inverse by the code generator matrix and seeing if the outcome is equal to the error matrix; repeating all the steps until a code generator matrix that satisfies said invariancy equations is found; and choosing a mapping scheme that takes advantage of the invariancy.

摘要翻译： 本发明的目的是提供一种用于选择调制/解调系统的编码方案，映射和打孔速率的方法，该方法将允许系统在后维特比步骤中补偿代码的某些变换，而不是 维特比之前。 这将允许对代码进行更快更简单的解码。 该方法包括以下步骤：选择编码方案和打孔率; 使用所述编码方案和打孔率来确定代码生成器矩阵; 将代码生成矩阵乘以代码生成矩阵的反馈自由权反转，并且查看结果是否等于乘以变换矩阵的代码生成矩阵; 通过代码生成器矩阵将代码生成矩阵的反馈自由逆乘乘误差矩阵，并查看结果是否等于误差矩阵; 重复所有步骤，直到找到满足所述不变方程的代码生成器矩阵; 并选择利用不间断的映射方案。

公开(公告)号：US6141391A

公开(公告)日：2000-10-31

申请号：US18677

申请日：1998-02-04

申请人： Robert Morelos-Zaragoza ,  Advait M. Mogre

发明人： Robert Morelos-Zaragoza ,  Advait M. Mogre

IPC分类号： H04L1/00 ,  H04L1/20 ,  H03D1/00 ,  H04L5/12 ,  H04L23/02 ,  H04L27/06

CPC分类号： H04L1/208 ,  H04L1/0036 ,  H04L1/0054 ,  H04L1/20

摘要： The present invention includes a method and system for improving performance of a receiver at a low signal-to-noise ratio. According to a first aspect, an encoded signal is received. The encoded signal is decoded to recover information in the encoded signal. Next, a threshold is ascertained in response to the recovered information, the threshold indicating a maximum number of acceptable errors in the recovered information. It is determined if the errors in the recovered information are in excess of the ascertained threshold. Information is then extracted from the encoded signal without decoding. The extracted information is output when the errors in the recovered information are in excess of the ascertained threshold. In all other instances, the recovered information is output. According to a second aspect, recovered signal data is output, the recovered signal data being either the recovered information or the extracted information. Next, an encoding type of the recovered signal data is determined, the encoding type being feedforward encoding when the encoding is in a first state, and being feedback encoding when the encoding is in a second state. A data transformation is then performed, the data transformation adapted for performing conversion for a feedforward encoder when the encoding type is feedforward encoding, and adapted for performing conversion for a feedback encoder when the encoding type is feedback encoding.

摘要翻译： 本发明包括一种用于在低信噪比下改善接收机的性能的方法和系统。 根据第一方面，接收编码信号。 编码信号被解码以恢复编码信号中的信息。 接下来，响应于恢复的信息确定阈值，阈值表示恢复的信息中的可接受的错误的最大数量。 确定恢复信息中的错误是否超过确定的阈值。 然后从编码信号中提取信息而不进行解码。 当恢复的信息中的错误超过确定的阈值时，输出提取的信息。 在所有其他情况下，输出恢复的信息。 根据第二方面，输出恢复的信号数据，恢复的信号数据是恢复的信息或提取的信息。 接下来，确定恢复信号数据的编码类型，编码类型是当编码处于第一状态时的前馈编码，并且当编码处于第二状态时是反馈编码。 然后执行数据变换，当编码类型是前馈编码时，数据变换适于执行前馈编码器的转换，并且适于在编码类型为反馈编码时对反馈编码器执行转换。

公开(公告)号：US07630456B2

公开(公告)日：2009-12-08

申请号：US10237768

申请日：2002-09-09

申请人： Advait M. Mogre ,  Atousa Haj-Shir-Mohammadi ,  Toshiyaki Yoshino

发明人： Advait M. Mogre ,  Atousa Haj-Shir-Mohammadi ,  Toshiyaki Yoshino

IPC分类号： H04L27/20

CPC分类号： H04L1/0058 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/2909 ,  H03M13/6362 ,  H04L1/0071 ,  H04L25/03866

摘要： An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate an MPEG packet data stream. The second circuit may be configured to (i) scramble the data stream to generate a scrambled data stream, (ii) encode the scrambled data stream to generate an encoded data stream, (iii) interleave the encoded data stream, (iv) encode the interleaved data stream, (v) modulate the encoded data stream, and (vi) filter the modulated data stream.

摘要翻译： 一种包括第一电路和第二电路的装置。 第一电路可以被配置为生成MPEG分组数据流。 第二电路可以被配置为（i）加扰数据流以产生加扰的数据流，（ii）对加扰的数据流进行编码以生成编码数据流，（iii）交织编码的数据流，（iv） 交织数据流，（v）调制编码数据流，和（vi）过滤调制数据流。