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1. 发明授权

US07184412B2 Method of increasing data rate in a wireless data communication network via clock switching 有权
标题翻译：通过时钟切换在无线数据通信网络中增加数据速率的方法
公开(公告)号：US07184412B2
公开(公告)日：2007-02-27
申请号：US10192439
申请日：2002-07-10
申请人： Chris Heegard
发明人： Chris Heegard
IPC分类号： H04J1/16
CPC分类号： H04L69/329 , H04L7/06
摘要： A method of increasing the data rate in a wireless Ethernet employs clock switching between the preamble and the encoded data portion of a packet structure. A shift block includes a tail sequence and a head sequence that is inserted between the preamble and the encoded data portion. The clock switching occurs within the shift block between the tail and the head sequences. The tail sequence and the head sequence are each constrained to be a fixed sequence.
摘要翻译：在无线以太网中提高数据速率的方法采用分组结构的前同步码和编码数据部分之间的时钟切换。移位块包括插入在前同步码和编码数据部分之间的尾序列和头序列。时钟切换发生在尾部和头部序列之间的移位块内。尾序列和头序列各自被限制为固定序列。

2. 发明申请

US20060198458A1 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion 有权
公开(公告)号：US20060198458A1
公开(公告)日：2006-09-07
申请号：US11403232
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.

3. 发明授权

US5745522A Randomizer for byte-wise scrambling of data 失效
标题翻译：用于逐字数据加扰的随机器
公开(公告)号：US5745522A
公开(公告)日：1998-04-28
申请号：US556415
申请日：1995-11-09
申请人： Chris Heegard
发明人： Chris Heegard
IPC分类号： H04L25/03 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04L25/03866
摘要： An N-bit, byte-wise data randomizer uses a linear feedback shift register arrangement where each register stage stores N-bits. In this manner, a pseudorandom sequence can be generated based on a nonbinary primitive polynomial over a finite field of any desired length. In a specific disclosed embodiment, the primitive, degree three trinomial f(x)=x.sup.3 +x+.alpha..sup.3 over the finite field F.sub.128 =F.sub.2 �.alpha.!/(.alpha..sup.7 +.alpha..sup.3 +1) is implemented.
摘要翻译： N位字节数据随机化器使用线性反馈移位寄存器布置，其中每个寄存器级存储N位。以这种方式，可以在任何期望长度的有限域上基于非二进制多项式生成伪随机序列。在具体公开的实施例中，实现了有限域F128 =F2α/（α7+α3+ 1）处的原始三度三项式f（x）= x3 + x +α3。

4. 发明授权

US5511096A Quadrature amplitude modulated data for standard bandwidth television channel 失效
标题翻译：标准带宽电视频道的正交幅度调制数据
公开(公告)号：US5511096A
公开(公告)日：1996-04-23
申请号：US184499
申请日：1994-01-18
申请人： Zheng Huang , Chris Heegard
发明人： Zheng Huang , Chris Heegard
IPC分类号： H03M13/00 , H03M13/29 , H04L1/00 , H04L27/00 , H04L27/34 , H04L27/38 , H04N7/015 , H04N7/24 , H04N7/66 , H04N19/00 , H04N21/2383 , H04N21/438 , H04L5/12 , G06F11/10 , H04L27/36 , H04N7/12
CPC分类号： H04L1/0057 , H03M13/1515 , H03M13/253 , H03M13/256 , H03M13/29 , H04L1/0041 , H04L1/0045 , H04L1/0054 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L27/3427 , H04L27/38 , H04N21/2383 , H04N21/4382
摘要： An outer symbol error correcting code is concatenated with a punctured multidimensional trellis code to provide an optimal scheme for communicating digital television signals in a standard (e.g., approximately six MHz) bandwidth channel via a cable television network or the like. An input signal is encoded using an outer symbol error correcting code to produce successive blocks. Each block comprises N seven-bit coded symbols of which M represent information to be communicated and the remaining N-M coded symbols comprise error correcting information. M/N is either 120/126, 121/127 or 122/128. The blocks are interleaved, and may be supplemented with control symbols that include a synchronization pattern for M/N=121/127 or M/N=122/128. The interleaved blocks are convolutionally encoded using an inner trellis code having a punctured rate 4/5 (sixty-four QAM) or 3/4 (sixteen QAM). The output symbols are multilevel modulated for transmission over a communication path using, for example, sixteen or sixty-four QAM. The transmitted symbols are decoded using a trellis decoder, deinterleaved, and further decoded in an outer symbol error decoder concatenated with the inner trellis decoder.
摘要翻译：外部符号纠错码与穿孔的多维网格码连接，以提供用于经由有线电视网络等在标准（例如，大约六MHz）带宽信道中传送数字电视信号的最佳方案。使用外部符号纠错码对输入信号进行编码以产生连续的块。每个块包括N个7位编码符号，其中M表示要传送的信息，其余N-M个编码符号包括纠错信息。 M / N为120/126，121/127或122/128。块被交织，并且可以用包括用于M / N = 121/127或M / N = 122/128的同步模式的控制符号进行补充。使用具有穿孔率4/5（六十四个QAM）或3/4（十六个QAM）的内部网格码对交织的块进行卷积编码。输出符号通过使用例如十六或六十四个QAM在通信路径上进行多电平调制。使用网格解码器解码所发送的符号，在与内部网格解码器连接的外部符号错误解码器中解交织并进一步解码。

5. 发明授权

US5162791A Collision detection using code rule violations of the Manchester code 失效
标题翻译：使用代码规则的冲突检测
公开(公告)号：US5162791A
公开(公告)日：1992-11-10
申请号：US416282
申请日：1989-10-02
申请人： Chris Heegard
发明人： Chris Heegard
IPC分类号： H03M5/12 , H04L12/413 , H04L25/49
CPC分类号： H04L12/40006 , H03M5/12 , H04L12/413 , H04L25/4904
摘要： A collision detection method and apparatus is disclosed for detecting code rule violations in Manchester encoded data packets. The signals.delta..sub.0 =S.sub.2n -S.sub.2n-1.delta..sub.1 =S.sub.2n+1 -S.sub.2n.delta..sub.2 =S.sub.2n+1 -S.sub.2n-1.sigma..sub.0 =S.sub.2n +S.sub.2n-1.are determined at time nT where S.sub.2n-1 and S.sub.2n are the Manchester code bit pair representative of the nth bit in a data stream having a bit period T. Processing of these signals permits the detection of most collisions since the Manchester coding rules are violated more than half the time in the signal formed by the colliding packets. To ensure 100% collision detection, a preamble using an intentional violation of the Manchester code in the pattern 10 11 01 10 is advantageously used in each data packet and a collision is signaled upon detection of two or more coding violations.
摘要翻译：公开了用于检测曼彻斯特编码数据分组中的代码规则违规的冲突检测方法和装置。信号delta 0 = S2n-S2n-1 delta1 = S2n + 1-S2n delta2 = S2n + 1-S2n-1 sigma0 = S2n + S2n-1。在时间nT处确定，其中S2n-1和S2n是代表具有位周期T的数据流中的第n位的曼彻斯特码位对。这些信号的处理允许检测大多数冲突，因为曼彻斯特编码规则被更多地违反超过了由碰撞包形成的信号的时间的一半。为了确保100％的碰撞检测，在每个数据分组中有利地使用在模式10 11 01 10中有意违反曼彻斯特码的前同步码，并且在检测到两个或多个编码违例时发出冲突。

6. 发明授权

US06961392B2 Joint equalization and decoding using a search-based decoding algorithm 有权
标题翻译：使用基于搜索的解码算法进行联合均衡和解码
公开(公告)号：US06961392B2
公开(公告)日：2005-11-01
申请号：US09922366
申请日：2001-08-03
申请人： Chris Heegard , Matthew B. Shoemake
发明人： Chris Heegard , Matthew B. Shoemake
IPC分类号： H04L1/00 , H04L25/03 , H04L27/06 , H03M13/03
CPC分类号： H04L1/0047 , H04L1/0054 , H04L25/03286
摘要： A method and apparatus for joint equalization and decoding using a search-based decoding algorithm on a channel exhibiting intersymbol interference distortion is described. A sequence of information bits is encoded and modulated wherein a finite state machine described with a tree structure is implemented. The information bits are transmitted over a transmission channel having a finite impulse response. At the receiving end, a sequential decoding algorithm is used to retrieve the sequence of information bits. In one example embodiment, a Fano sequential decoder emulates the cascade of finite state machines formed by the trellis code and the channel finite response characterization to determine encoded symbols as prescribed by the path through the various branches of the tree in response to computed metrics. The distance metrics determine the path through the tree that best matches the received symbols.
摘要翻译：描述了一种使用基于搜索的解码算法对出现符号间干扰失真的信道进行联合均衡和解码的方法和装置。信息比特序列被编码和调制，其中实现了用树结构描述的有限状态机。信息比特通过具有有限脉冲响应的传输信道进行传输。在接收端，使用顺序解码算法来检索信息比特序列。在一个示例实施例中，Fano顺序解码器模拟由网格码和信道有限响应表征形成的有限状态机的级联，以根据计算的度量来确定通过树的各种分支的路径所规定的编码符号。距离度量确定通过树最好匹配接收符号的路径。

7. 发明授权

US06823488B1 Packet binary convolutional codes 有权
标题翻译：分组二进制卷积码
公开(公告)号：US06823488B1
公开(公告)日：2004-11-23
申请号：US09366963
申请日：1999-08-04
申请人： Chris Heegard , Matthew B. Shoemake
发明人： Chris Heegard , Matthew B. Shoemake
IPC分类号： H03M1303
CPC分类号： H04L1/0059 , H04L1/0041 , H04L25/03866 , H04L27/186
摘要： A 64-state binary convolutional code is disclosed for a high-speed physical layer (PHY) of a communication network. The proposed code provides improved performance in terms of signal to noise ratio (SNR) and multi-path rejection than previously known codes. The proposed system, which includes binary convolutional codes with scrambling in a packet-based system, is referred to herein as “packet binary convolutional coding” (PBCC). The substantial increase in performance that may be achieved by PBCC makes it an ideal solution for high performance forward error correction (FEC) in a high-speed PHY.
摘要翻译：公开了用于通信网络的高速物理层（PHY）的64状态二进制卷积码。所提出的代码在信噪比（SNR）和多路径抑制方面提供了比先前已知的代码更好的性能。所提出的系统，其包括在基于分组的系统中具有加扰的二进制卷积码，在本文中被称为“分组二进制卷积编码”（PBCC）。 PBCC可以实现的性能大幅提高使其成为高速PHY中高性能前向纠错（FEC）的理想解决方案。

8. 发明授权

US6160854A Concatenated trellis coded modulation and linear block codes 失效
标题翻译：串联网格编码调制和线性块码
公开(公告)号：US6160854A
公开(公告)日：2000-12-12
申请号：US3591
申请日：1998-01-06
申请人： Chris Heegard , David J. Rowe
发明人： Chris Heegard , David J. Rowe
IPC分类号： H03M13/25 , H03M13/29 , H04L1/00 , H04L27/34 , H04L23/02
CPC分类号： H04L1/0065 , H03M13/251 , H03M13/253 , H03M13/256 , H03M13/2906 , H03M13/2936 , H04L1/0057 , H04L1/006 , H04L27/3433
摘要： A concatenated trellis coded modulation and linear block (e.g., Reed-Solomon) encoding scheme splits data to be encoded into two data streams, one of which is both linear block encoded and trellis encoded, and the other of which either remains uncoded or is encoded with a weaker strength linear block code. The coding scheme requires the use of a special decoder which decodes the trellis encoded data first, and then uses the resulting information to decode the non-trellis encoded information. In embodiments using linear block coding for the non-trellis encoded data stream, the relative strengths of the two linear block encoders are selected to balance the resulting code, thereby maximizing coding gain and efficiency.
摘要翻译：级联网格编码调制和线性块（例如Reed-Solomon）编码方案将要编码的数据分解成两个数据流，其中一个数据流是线性块编码和网格编码，另一个保持未编码或编码具有较弱的强度线性块码。编码方案需要使用首先对网格编码数据进行解码的特殊解码器，然后使用得到的信息来解码非格状编码信息。在使用非格状编码数据流的线性块编码的实施例中，选择两个线性块编码器的相对强度以平衡所得到的代码，从而最大化编码增益和效率。

9. 发明授权

US5790570A Concatenated trellis coded modulation and linear block codes 失效
公开(公告)号：US5790570A
公开(公告)日：1998-08-04
申请号：US697837
申请日：1996-08-30
申请人： Chris Heegard , David J. Rowe
发明人： Chris Heegard , David J. Rowe
IPC分类号： H03M13/25 , H03M13/29 , H04L1/00 , H04L27/34 , H03M13/00 , H03M13/12
CPC分类号： H04L1/0065 , H03M13/251 , H03M13/253 , H03M13/256 , H03M13/2906 , H03M13/2936 , H04L1/0057 , H04L1/006 , H04L27/3433
摘要： A concatenated trellis coded modulation and linear block (e.g., Reed-Solomon) encoding scheme splits data to be encoded into two data streams, one of which is both linear block encoded and trellis encoded, and the other of which either remains uncoded or is encoded with a weaker strength linear block code. The coding scheme requires the use of a special decoder which decodes the trellis encoded data first, and then uses the resulting information to decode the non-trellis encoded information. In embodiments using linear block coding for the non-trellis encoded data stream, the relative strengths of the two linear block encoders are selected to balance the resulting code, thereby maximizing coding gain and efficiency.

10. 发明授权

US5511082A Punctured convolutional encoder 失效
标题翻译：穿刺卷积编码器
公开(公告)号：US5511082A
公开(公告)日：1996-04-23
申请号：US240232
申请日：1994-05-10
申请人： Stephen K. How , Chris Heegard
发明人： Stephen K. How , Chris Heegard
IPC分类号： H03M13/23 , H04L1/00 , H03M13/12
CPC分类号： H04L1/0069 , H03M13/23 , H04L1/0059
摘要： A method and apparatus are provided for convolutionally encoding digital data with a rate 4/5 convolutional code. A nonoptimal rate 1/2, sixteen-state convolutional code is punctured to rate 4/5 using a puncture map of ##EQU1## and octal generators 25, 37 wherein .nu.=4. An incoming data stream is processed using the rate 4/5 code. Punctured rate 3/4 and 6/7 codes are also provided.
摘要翻译：提供了一种利用速率4/5卷积码对数字数据进行卷积编码的方法和装置。使用的穿孔图和八进制生成器25,37，其中nu = 4，将非最佳速率1/2十六状态卷积码打孔至比率4/5。使用速率4/5代码处理输入数据流。还提供穿刺率3/4和6/7代码。

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