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    • 1. 发明申请
    • Asynchronous circuit design tool and computer program product
    • 异步电路设计工具和计算机程序产品
    • US20060190851A1
    • 2006-08-24
    • US11037139
    • 2005-01-19
    • Nobuo KarakiTak Lee
    • Nobuo KarakiTak Lee
    • G06F17/50
    • G06F17/5059
    • It is the object of the present invention to provide asynchronous circuit design tools for those engineers who are versed in standard hardware description languages (HDLs), which is widely used in industry mainly for synchronous circuit design, to design asynchronous circuits with relative ease. To accomplish the object, the asynchronous circuit design tools of the present invention include a translator for transforming a code written in an asynchronous circuit design language, which is based on a standard HDL and includes minimal primitives for describing the communications between asynchronous circuit blocks or processes, into a code written in a standard HDL, which is originally developed for synchronous circuit design. The codes transformed into the standard HDL can be functionally verified by using commercially available simulators, which are originally developed for verifying synchronous circuit design.
    • 本发明的目的是为那些在业界主要用于同步电路设计中广泛使用的标准硬件描述语言(HDL)的工程师提供异步电路设计工具,相对容易地设计异步电路。 为了实现该目的,本发明的异步电路设计工具包括用于变换以异步电路设计语言编写的代码的翻译器,其基于标准HDL并且包括用于描述异步电路块或处理之间的通信的最小原语 ,转换为标准HDL编写的代码,最初用于同步电路设计。 转换为标准HDL的代码可以通过使用商业上可用的模拟器进行功能验证,这些模拟器最初用于验证同步电路设计。
    • 4. 发明申请
    • LDPC (low density parity check) code size adjustment by shortening and puncturing
    • 通过缩短和穿孔对LDPC(低密度奇偶校验)码大小进行调整
    • US20070162814A1
    • 2007-07-12
    • US11417316
    • 2006-05-03
    • Ba-Zhong ShenTak LeeKelly Cameron
    • Ba-Zhong ShenTak LeeKelly Cameron
    • H03M13/00
    • H03M13/116H03M13/1185H03M13/1188H03M13/618H03M13/6362
    • LDPC (Low Density Parity Check) code size adjustment by shortening and puncturing. A variety of LDPC coded signals may be generated from an initial LDPC code using selected shortening and puncturing. Using LDPC code size adjustment approach, a single communication device whose hardware design is capable of processing the original LDPC code is also capable to process the various other LDPC codes constructed from the original LDPC code after undergoing appropriate shortening and puncturing. This provides significant design simplification and reduction in complexity because the same hardware can be implemented to accommodate the various LDPC codes generated from the original LDPC code. Therefore, a multi-LDPC code capable communication device can be implemented that is capable to process several of the generated LDPC codes. This approach allows for great flexibility in the LDPC code design, in that, the original code rate can be maintained after performing the shortening and puncturing.
    • LDPC(低密度奇偶校验)码字大小调整通过缩短和删截。 可以使用选择的缩短和删截从初始LDPC码生成各种LDPC编码信号。 使用LDPC码大小调整方法,硬件设计能够处理原始LDPC码的单个通信设备也能够在进行适当的缩短和删截之后处理由原始LDPC码构成的各种其他LDPC码。 这提供了重要的设计简化和复杂性的降低,因为可以实现相同的硬件以适应从原始LDPC码产生的各种LDPC码。 因此,可以实现能够处理几个所生成的LDPC码的具有多LDPC码的通信装置。 这种方法允许在LDPC码设计中具有极大的灵活性,因为可以在执行缩短和删截之后维持原始码率。
    • 6. 发明申请
    • System and method for adjusting the phase of a frequency-locked clock
    • 用于调节锁频时钟相位的系统和方法
    • US20070291891A1
    • 2007-12-20
    • US11892607
    • 2007-08-24
    • Tak LeeJeffrey PutnamJames Cavallo
    • Tak LeeJeffrey PutnamJames Cavallo
    • H03D3/24
    • H03L7/00H04J3/0682
    • A clock signal regeneration system and method to adjust the phase of a frequency-locked clock signal is provided. The system includes a numerically controlled oscillator, a clock source, and an adder. In one embodiment, additional components are included in the system to ensure that underflow or overflow of the numerically controlled oscillator is prevented. In another embodiment, additional components are included to ensure that output pulses from the numerically controlled oscillator do not occur within a minimum time interval. The method includes deriving a phase adjustment factor, adding the phase adjustment factor to a frequency control word, providing the modified frequency control word to a numerically controlled oscillator and generating a phase shifted, frequency-locked output signal.
    • 提供了一种用于调节锁频时钟信号的相位的时钟信号再生系统和方法。 该系统包括数控振荡器,时钟源和加法器。 在一个实施例中,系统中包括附加组件以确保防止数控振荡器的下溢或溢出。 在另一个实施例中,包括附加组件以确保来自数控振荡器的输出脉冲不会在最小时间间隔内发生。 该方法包括导出相位调整因子,将相位调整因子加到频率控制字上,将经修改的频率控制字提供给数控振荡器并产生相移的频率锁定输出信号。
    • 7. 发明申请
    • Implementation of LDPC (Low Density Parity Check) decoder by sweeping through sub-matrices
    • 通过扫描子矩阵实现LDPC(低密度奇偶校验)解码器
    • US20070157062A1
    • 2007-07-05
    • US11360268
    • 2006-02-23
    • Tak LeeHau TranBa-Zhong ShenKelly Cameron
    • Tak LeeHau TranBa-Zhong ShenKelly Cameron
    • H03M13/00
    • H03M13/116H03M13/1137H03M13/255H03M13/27H03M13/6362H03M13/6566
    • Implementation of LDPC (Low Density Parity Check) decoder by sweeping through sub-matrices. A novel approach is presented by which an LDPC coded signal is decoded processing the columns and rows of the individual sub-matrices of the low density parity check matrix corresponding to the LDPC code. The low density parity check matrix can partitioned into rows and columns according to each of the sub-matrices of it, and each of those sub-matrices also includes corresponding rows and columns. For example, when performing bit node processing, the same columns of at 1 or more sub-matrices can be processed together (e.g., all 1st columns in 1 or more sub-matrices, all 2nd columns in 1 or more sub-matrices, etc.). Analogously, when performing check node processing, the same rows of 1 or more sub-matrices can be processed together (e.g., all 1st rows in 1 or more sub-matrices, all 2nd rows in 1 or more sub-matrices, etc.).
    • 通过扫描子矩阵实现LDPC(低密度奇偶校验)解码器。 提出了一种解码处理与LDPC码对应的低密度奇偶校验矩阵的各个子矩阵的列和行的LDPC编码信号的新方法。 低密度奇偶校验矩阵可以根据它的每个子矩阵划分成行和列,并且这些子矩阵中的每一个也包括相应的行和列。 例如,当执行位节点处理时,可以一起处理1个或更多个子矩阵的相同列(例如,1个或更多个子矩阵中的所有1个SUP列,全部2个SUP 1个或更多个子矩阵中的 / nd>列等)。 类似地,当执行校验节点处理时,可以一起处理1个或更多个子矩阵的相同行(例如,1个或更多个子矩阵中的所有1 行,全部2个 1个或多个子矩阵中的行等)。
    • 8. 发明申请
    • Sub-matrix-based implementation of LDPC (Low Density Parity Check ) decoder
    • LDPC(低密度奇偶校验)解码器的基于子矩阵的实现
    • US20070157061A1
    • 2007-07-05
    • US11360267
    • 2006-02-23
    • Tak LeeHau TranBa-Zhong ShenKelly Cameron
    • Tak LeeHau TranBa-Zhong ShenKelly Cameron
    • H03M13/00
    • H03M13/116H03M13/1137H03M13/255H03M13/27H03M13/6362H03M13/6566
    • Sub-matrix-based implementation of LDPC (Low Density Parity Check) decoder. A novel approach is presented by which an LDPC coded signal is decoded by processing 1 sub-matrix at a time. A low density parity check matrix corresponding to the LDPC code includes rows and columns of sub-matrices. For example, when performing bit node processing, 1 or more sub-matrices in a column are processed; when performing check node processing, 1 or more sub-matrices in a row are processed. If desired, when performing bit node processing, the sub-matrices in each column are successively processed together (e.g., all column 1 sub-matrices, all column 2 sub-matrices, etc.). Analogously, when performing check node processing, the sub-matrices in each row can be successively processed together (e.g., all row 1 sub-matrices, all row 2 sub-matrices in row 2, etc.).
    • LDPC(低密度奇偶校验)解码器的基于子矩阵的实现。 提出了一种新颖的方法,通过该方法通过一次处理1个子矩阵对LDPC编码信号进行解码。 对应于LDPC码的低密度奇偶校验矩阵包括子矩阵的行和列。 例如,当执行位节点处理时,处理列中的一个或多个子矩阵; 当执行校验节点处理时,处理一行中的一个或多个子矩阵。 如果需要,当执行位节点处理时,每列中的子矩阵被连续处理(例如,所有列1个子矩阵,全部2个子矩阵等)。 类似地,当执行校验节点处理时,可以一起连续地处理每行中的子矩阵(例如,所有行1子矩阵,行2中的所有行2子矩阵等)。