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11. 发明授权

US07508877B2 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion 有权
标题翻译：具有高分离和色散的自反相turbo码交织的方法和装置
公开(公告)号：US07508877B2
公开(公告)日：2009-03-24
申请号：US11403232
申请日：2006-04-12
申请人： John T. Coffey , Chris Heegard
发明人： John T. Coffey , Chris Heegard
IPC分类号： H04L5/12 , H04L23/02
CPC分类号： H04L1/005 , H04L1/0066
摘要： The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention also provides methods and apparatus for encoding digital data and communicating the digital data using self-inverting turbo code interleavers/de-interleavers.
摘要翻译：本发明提供了具有高分离和高色散特性的自反相turbo码交织器的方法。提供了用于从现有非自反相交织器的规范中确定性地生成自反相turbo码交织器的方法。还提供了用于随机生成自反相turbo码交织器的方法。本发明还提供了用于对数字数据进行编码和使用自反相turbo码交织器/解交织器传送数字数据的方法和装置。

12. 发明授权

US07505526B2 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion 有权
公开(公告)号：US07505526B2
公开(公告)日：2009-03-17
申请号：US11402755
申请日：2006-04-12
申请人： John T. Coffey , Chris Heegard
发明人： John T. Coffey , Chris Heegard
IPC分类号： H04L5/12 , H04L23/02
CPC分类号： H04L1/005 , H04L1/0066
摘要： The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention also provides methods and apparatus for encoding digital data and communicating the digital data using self-inverting turbo code interleavers/de-interleavers.

13. 发明授权

US07227949B2 Separate self-synchronizing packet-based scrambler having replay variation 有权
标题翻译：具有重播变化的分离的自同步基于分组的扰码器
公开(公告)号：US07227949B2
公开(公告)日：2007-06-05
申请号：US10355676
申请日：2003-01-30
申请人： Chris Heegard , Richard G. C. Williams
发明人： Chris Heegard , Richard G. C. Williams
IPC分类号： H04L5/02
CPC分类号： H04L5/026
摘要： A separated synchronizing scrambler/descrambler pair that removes the possibility of catastrophic error due to improper transmission of initial condition information without disrupting the OFDM modulation scheme of a system that includes error-correction coding circuitry and replay variation. A transmitting device within the pair includes a first and a second data scrambler wherein the first data scrambler couples to receive the incoming data stream and filters the incoming data stream to provide a first filtered signal using a key signal. The second data scrambler, having an initial condition, couples to receive the first filtered signal and converts it into a scrambled signal using a scrambling seed. The second data scrambler comprises a random series generator for generating the scrambling seed to convert the first filtered signal into a scrambled signal. The scrambled signal is transmitted to the receiving device. A receiving device within the pair includes a first and a second data descrambler coupled together. The first data descrambler, having an initial condition equivalent to that of the second data scrambler, couples to receive the transmitted scrambled input data stream to convert it into a descrambled signal using a descrambling seed equivalent to the scrambling seed. The first data descrambler includes a random series generator for generating the descrambling seed. The second data descrambler couples to receive the descrambled signal and filters it to provide a filtered descrambled signal using a feedforward filter and a key signal. The feedforward filter is structured similar to the feedback filter.
摘要翻译：分离的同步扰码器/解扰器对，其消除由于初始条件信息的不正确传输而导致的灾难性错误的可能性，而不会中断包括纠错编码电路和重放变化的系统的OFDM调制方案。该对内的发送装置包括第一和第二数据扰频器，其中第一数据扰频器耦合以接收输入数据流并对输入数据流进行滤波以使用键信号提供第一滤波信号。具有初始条件的第二数据扰频器耦合以接收第一滤波信号并且使用加扰种子将其转换成加扰信号。第二数据扰频器包括随机串行发生器，用于产生加扰种子以将第一滤波信号转换成加扰信号。加扰信号被发送到接收设备。该对内的接收装置包括耦合在一起的第一和第二数据解扰器。具有等同于第二数据扰频器的初始条件的第一数据解扰器耦合以接收所发送的加扰输入数据流，以使用等效于加扰种子的解扰种子将其转换成解扰信号。第一数据解扰器包括用于产生解扰种子的随机序列发生器。第二数据解扰器耦合以接收解扰信号并对其进行滤波以使用前馈滤波器和键信号来提供经滤波的解扰信号。前馈滤波器的结构类似于反馈滤波器。

14. 发明申请

US20060198457A1 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion 有权
公开(公告)号：US20060198457A1
公开(公告)日：2006-09-07
申请号：US11402755
申请日：2006-04-12
申请人： John Coffey , Chris Heegard
发明人： John Coffey , Chris Heegard
IPC分类号： H04L23/02
CPC分类号： H04L1/005 , H04L1/0066
摘要： The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention also provides methods and apparatus for encoding digital data and communicating the digital data using self-inverting turbo code interleavers/de-interleavers.

15. 发明授权

US06993095B2 Phase-locked loop initialization via curve-fitting 有权
公开(公告)号：US06993095B2
公开(公告)日：2006-01-31
申请号：US09809748
申请日：2001-03-15
申请人： Chris Heegard , Peter A. Murphy
发明人： Chris Heegard , Peter A. Murphy
IPC分类号： H03D3/24
CPC分类号： H04L27/2272 , H04L2027/0048 , H04L2027/0055 , H04L2027/0067
摘要： A method and apparatus for accurately estimating the carrier frequency offset and the carrier phase offset of a digitally modulated signal using a signal processing algorithm to initialize the state variables of a Phase-Locked Loop (PLL) is disclosed. A sequence of phase values is estimated from a received sequence of symbols and the angular effect due to the modulation format is removed from the sequence of phase values. A curve-fit algorithm based in one embodiment on the RLS algorithm is then applied to a sequence of unwrapped phase values to estimate the carrier frequency offset and the carrier phase offset.

16. 发明申请

US20080273614A1 SYSTEM, METHOD, AND COMPUTER-READABLE MEDIUM FOR MULTILEVEL SHAPING FOR WIRELESS COMMUNICATION SYSTEMS 有权
标题翻译：用于无线通信系统的多种形式的系统，方法和计算机可读介质
公开(公告)号：US20080273614A1
公开(公告)日：2008-11-06
申请号：US12113807
申请日：2008-05-01
申请人： Chris Heegard , Syed Nadeem Ahmed , Brian Chadwick Joseph
发明人： Chris Heegard , Syed Nadeem Ahmed , Brian Chadwick Joseph
IPC分类号： H04L27/00
CPC分类号： H04L25/4919 , H04L1/0057 , H04L1/0071 , H04L27/2602 , H04L27/34
摘要： A system, method and computer-readable medium for encoding and decoding digital information over a channel is provided. Type Mapping is employed and is based on the partitioning of vectors over an alphabet into “types” and using enumeration for the encoding and decoding process. Type mapping allows for signal alphabets of arbitrary size and date rate flexible coding. Tradeoffs between optimal rate versus Signal to Noise Ratio are provided and works as a compliment to the Forward Error Control that may be employed in communications products.
摘要翻译：提供了一种用于通过信道对数字信息进行编码和解码的系统，方法和计算机可读介质。使用类型映射，并且基于将字母上的向量划分为“类型”并使用用于编码和解码过程的枚举。类型映射允许任意大小和日期速率灵活编码的信号字母。提供了最佳速率与信噪比之间的权衡，并且可以用作通信产品中可能采用的前向错误控制。

17. 发明授权

US07113556B1 Reliable decision directed adaptation in a communication system employing forward error control 有权
标题翻译：采用前向错误控制的通信系统中可靠的决策指导适应
公开(公告)号：US07113556B1
公开(公告)日：2006-09-26
申请号：US09642532
申请日：2000-08-18
申请人： Chris Heegard , Stanley K. Ling
发明人： Chris Heegard , Stanley K. Ling
IPC分类号： H04B1/10
CPC分类号： H04L25/03057 , H04L1/0009 , H04L1/0015 , H04L2025/03401 , H04L2025/03484 , H04L2025/03617 , H04L2025/03694
摘要： The present invention provides a method and apparatus for selectively updating an adaptive element in a communications receiver based on a determination that the received data is accurate. When inaccurate data is received, the system determines that using that data to update the adaptive element will not be beneficial and excludes the data from being sent to the adaptive element. One mechanism for determining that data has been incorrectly received is the calculation of syndromes as part of a Forward Error Control (FEC) system. Detection of errors through use of the syndrome calculation can be supplemented through windowing to make a determination as to whether a number of received bits should be used or disregarded by the adaptive element. The adaptive element can comprise any number of decision-directed loops including adaptive processors and carrier and timing recovery loops.
摘要翻译：本发明提供了一种用于基于接收到的数据准确的确定来选择性地更新通信接收机中的自适应元件的方法和装置。当接收到不准确的数据时，系统确定使用该数据更新自适应元件将不是有益的，并且排除数据被发送到自适应元件。用于确定数据未正确接收的一种机制是作为前向错误控制（FEC）系统的一部分的综合征的计算。可以通过窗口来补充通过使用校正子计算来检测错误，以确定是否应该由自适应元件使用或忽略多个接收的比特。自适应元件可以包括任何数量的决策导向环路，包括自适应处理器和载波和定时恢复环路。

18. 发明授权

US07082168B2 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion 有权
公开(公告)号：US07082168B2
公开(公告)日：2006-07-25
申请号：US10436617
申请日：2003-05-13
申请人： John T. Coffey , Chris Heegard
发明人： John T. Coffey , Chris Heegard
IPC分类号： H04L23/02
CPC分类号： H04L1/005 , H04L1/0066
摘要： The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention also provides methods and apparatus for encoding digital data and communicating the digital data using self-inverting turbo code interleavers/de-interleavers.

19. 发明授权

US06782046B1 Decision-directed adaptation for coded modulation 有权
标题翻译：用于编码调制的决策自适应
公开(公告)号：US06782046B1
公开(公告)日：2004-08-24
申请号：US09422406
申请日：1999-10-21
申请人： Stanley K. Ling , Chris Heegard , Eric J. Rossin
发明人： Stanley K. Ling , Chris Heegard , Eric J. Rossin
IPC分类号： H03K5159
CPC分类号： H04L25/03038 , H04L2025/03375 , H04L2025/03617
摘要： A method and apparatus for decision-directed adaptation for coded modulation is presented in which a modulation decoder and data re-encoder are used to create an estimated version of a received signal based on the use of a reliable modulation code. An adaptive equalizer is used to process the received signal, and the differences between the received signal passed through the adaptive equalizer and the estimated version are used by the adaptive equalizer to set the equalizer coefficients. A variety of adaptation algorithms can be used including Least Mean Squares (LMS) and Recursive Least Squares (RLS).
摘要翻译：提出了一种用于编码调制的决策自适应的方法和装置，其中使用调制解码器和数据重新编码器来基于使用可靠调制码来创建接收信号的估计版本。自适应均衡器用于处理接收的信号，自适应均衡器使用通过自适应均衡器的接收信号与估计版本之间的差异来设置均衡器系数。可以使用各种适应算法，包括最小均方（LMS）和递归最小二乘法（RLS）。

20. 发明授权

US06701483B1 Fast search-based decoding scheme 有权
标题翻译：基于快速搜索的解码方案
公开(公告)号：US06701483B1
公开(公告)日：2004-03-02
申请号：US09642266
申请日：2000-08-18
申请人： Chris Heegard , Matthew B. Shoemake , Scott Petler
发明人： Chris Heegard , Matthew B. Shoemake , Scott Petler
IPC分类号： H03M1303
CPC分类号： H03M13/39
摘要： A method and apparatus for performing a fast search in a search-based decoding algorithm. In one embodiment, the Fano sequential decoding algorithm is used in combination with a fast search-based decoding scheme to reduce the latency inherent in the decoding algorithm. The fast search-based decoding scheme provides a method for estimating metrics ahead of time for edges at distance d at least equal to 2. This allows a decision module such as a Fano state machine to readily make a decision as to which direction and edge to proceed on without further metrics calculation.
摘要翻译：一种用于在基于搜索的解码算法中执行快速搜索的方法和装置。在一个实施例中，Fano顺序解码算法与基于快速搜索的解码方案组合使用以减少解码算法中固有的等待时间。基于快速搜索的解码方案提供了一种用于在距离d至少等于2的边缘提前估计度量的方法。这允许诸如Fano状态机的决策模块容易地决定哪个方向和边缘继续进行，无需进一步的指标计算。

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