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    METHOD AND APPARATUS FOR SYMBOL TIMING RECOVERY
    2.
    发明申请
    METHOD AND APPARATUS FOR SYMBOL TIMING RECOVERY 审中-公开
    符号时序恢复的方法和装置

    公开(公告)号：WO2010138199A3

    公开(公告)日：2011-03-24

    申请号：PCT/US2010001570

    申请日：2010-05-28

    Applicant: THOMSON LICENSING ,  KNUTSON PAUL GOTHARD ,  SCHMITT DIRK ,  GAO WEN

    Inventor： KNUTSON PAUL GOTHARD ,  SCHMITT DIRK ,  GAO WEN

    IPC: H04L7/04 ,  H04L7/10 ,  H04L27/26

    CPC classification number: H04L27/2678 ,  H04H40/90 ,  H04L7/0062 ,  H04L7/042 ,  H04L7/10 ,  H04L27/0014 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2679 ,  H04L2027/0053 ,  H04L2027/0067 ,  H04W56/005

    Abstract: Methods and apparatus for symbol timing recovery are provided. Both a coarse symbol timing recovery method and apparatus, and a fine symbol timing recovery method and apparatus are described which can be used jointly for symbol recovery, for example in phase shift keying receivers. The coarse method involves the use of differential correlations and finding the time difference in peak values of the correlation results. The fine method involves interpolation of a received digital signal, followed by filtering and timing error detection. The error detection signal is further filtered and used to control the interpolator. The methods provide for robust symbol timing synchronization.

    Abstract translation: 提供了符号定时恢复的方法和装置。 描述了粗符号定时恢复方法和装置以及可以联合用于符号恢复的精细符号定时恢复方法和装置，例如在相移键控接收机中。 粗略方法涉及使用差分相关性，并找出相关结果峰值的时间差。 精细的方法包括对接收到的数字信号进行插值，然后进行滤波和定时误差检测。 误差检测信号被进一步滤波并用于控制内插器。 这些方法提供鲁棒符号定时同步。

    BIT INTERLEAVED LDPC CODED MODULATION AND PHYSICAL LAYER SIGNALING
    3.
    发明申请
    BIT INTERLEAVED LDPC CODED MODULATION AND PHYSICAL LAYER SIGNALING 审中-公开
    位交织LDPC码调制和物理层信令

    公开(公告)号：WO2010005470A3

    公开(公告)日：2010-04-15

    申请号：PCT/US2009003578

    申请日：2009-06-16

    Applicant: THOMSON LICENSING ,  LEI JING ,  GAO WEN ,  KNUTSON PAUL GOTHARD ,  CHEN HOU-SHIN

    Inventor： LEI JING ,  GAO WEN ,  KNUTSON PAUL GOTHARD ,  CHEN HOU-SHIN

    IPC: H04L1/00 ,  H03M13/25 ,  H03M13/27 ,  H03M13/35

    CPC classification number: H04L1/0041 ,  H04L1/0057 ,  H04L1/007 ,  H04L1/0071

    Abstract: A proposal for a DVB-C2 baseline system, mainly focused on the channel coding and bit interleaving modules for spectrally efficient modulation is described. Due to the implementation simplicity of the low density parity check (LDPC) codes standardized in the DVB-S2 specification, it is proposed to extend their application to cable channels and choose the subset with long block length ( L = 64800 ) and medium to high rates ( 2/5 = R = 9/10 ) as the forward error correction (FEC) codes of DVB-C2 systems. Due to the non-uniform bitwise error protection inherent to high-order modulations (e.g. 256-QAM, 1024-QAM) and irregular LDPC codes (e.g. DVB-S2 codes), there exists a mismatch between the modulation and the channel coding in general if the two modules are developed independently but concatenated directly. To match the error resilience of a finite-length channel code and a given constellation, the principles described herein design a bit interleaver and insert it between the channel encoder and the modulator. As a result, a better tradeoff between bandwidth-efficiency and power-efficiency can be achieved with a minor increase of hardware complexity.

    Abstract translation: 描述了DVB-C2基线系统的建议，主要集中在用于频谱有效调制的信道编码和比特交织模块。 由于在DVB-S2规范中标准化的低密度奇偶校验（LDPC）码的实现简单，因此建议将其应用扩展到有线信道并选择具有长块长度（L = 64800）和中等到高的子集 作为DVB-C2系统的前向纠错（FEC）码率（2/5 = R = 9/10）。 由于高阶调制（例如256-QAM，1024-QAM）和不规则LDPC码（例如DVB-S2码）固有的非均匀位错误保护，通常在调制和信道编码之间存在失配 如果这两个模块是独立开发的，但直接连接起来。 为了匹配有限长度信道码和给定星座的差错恢复能力，本文描述的原理设计比特交织器并将其插入到信道编码器和调制器之间。 因此，只需稍稍增加硬件复杂度就可以实现带宽效率和功效之间的更好折衷。

    METHOD AND APPARATUS FOR ROBUST AND HIGH EFFICIENCY FEC FRAME HEADER RECOVERY
    5.
    发明申请
    METHOD AND APPARATUS FOR ROBUST AND HIGH EFFICIENCY FEC FRAME HEADER RECOVERY 审中-公开
    用于鲁棒性和高效FEC帧头部恢复的方法和设备

    公开(公告)号：WO2011008238A2

    公开(公告)日：2011-01-20

    申请号：PCT/US2010001844

    申请日：2010-06-28

    Applicant: THOMSON LICENSING ,  CHEN HOU-SHIN ,  GAO WEN

    Inventor： CHEN HOU-SHIN ,  GAO WEN

    IPC: H04L1/00

    CPC classification number: H04L1/0057 ,  H04L1/0004 ,  H04L1/0045 ,  H04L1/0072 ,  H04L27/38

    Abstract: Methods and apparatus for FEC frame header detection are provided, suitable for use in a DVB-C2 receiver. A first method comprises demodulating with a quadrature phase shift keying (QPSK) demapper, followed by correlation and symmetry measures for detection of a robust FEC header. A second method comprises demodulating with a 16 quadrature amplitude modulation (QAM) demapper, followed by correlation and symmetry measures for detection of a high efficiency FEC header. Another embodiment comprises using both the first and second methods to find the FEC header because the first symbol of the FEC frame header may be sent either in robust mode or in high efficiency mode. There is also provided a method and apparatus for generating an alternate decision statistic for determining detection of the FEC frame header.

    Abstract translation: 提供了适用于DVB-C2接收机的FEC帧头检测方法和装置。 第一种方法包括用正交相移键控（QPSK）去映射器解调，然后是用于检测鲁棒FEC头部的相关和对称测量。 第二种方法包括用16正交幅度调制（QAM）去映射器解调，然后是用于检测高效FEC头部的相关和对称测量。 另一个实施例包括使用第一和第二方法来找到FEC报头，因为FEC帧报头的第一个符号可以以鲁棒模式或高效率模式发送。 还提供了一种用于生成用于确定FEC帧头的检测的替代决策统计量的方法和设备。

    METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEC FRAME HEADERS
    7.
    发明申请
    METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEC FRAME HEADERS 审中-公开
    发送和接收FEC帧头的方法和设备

    公开(公告)号：WO2010065100A3

    公开(公告)日：2010-08-05

    申请号：PCT/US2009006330

    申请日：2009-12-01

    Applicant: THOMSON LICENSING ,  CHEN HOU-SHIN ,  GAO WEN

    Inventor： CHEN HOU-SHIN ,  GAO WEN

    IPC: H04L27/20 ,  H03M13/13 ,  H04L1/00 ,  H04L27/22

    CPC classification number: H04L1/0057 ,  H03M13/136 ,  H03M13/6555 ,  H04L1/0072 ,  H04L27/20 ,  H04L27/22

    Abstract: A frame header of Forward Error Correction (FEC) is provided, suitable for using in the DVB-C2 Standard. In the DVB-C2 Standard, Adaptive Coding and Modulation (ACM) or Variable Coding and Modulation (VCM) is applied to each FEC block to provide as much flexibility as possible. As a result, a frame header is attached in front of each FEC frame to inform the coding rate, modulation type and physical layer pipe identifier. Besides the signaling of physical layer related information, the FEC frame header has to provide a structure so that it can be easily and reliably detected in the receiver. Motivated by the need in DVB-C2 Standard, an efficient and reliable FEC header suitable for DVB-C2 Standard is provided in at least one implementation in this disclosure. In addition, the detection Method of the FEC header is described.

    Abstract translation: 提供前向纠错（FEC）的帧头，适用于DVB-C2标准。 在DVB-C2标准中，将自适应编码和调制（ACM）或可变编码和调制（VCM）应用于每个FEC块以提供尽可能大的灵活性。 结果，帧头被附加在每个FEC帧的前面以通知编码率，调制类型和物理层管道标识符。 除了物理层相关信息的信令之外，FEC帧头还必须提供一种结构，以便在接收机中可以容易且可靠地检测到它。 受DVB-C2标准需求的驱动，在本公开的至少一个实现中提供了适用于DVB-C2标准的高效且可靠的FEC报头。 另外，描述了FEC报头的检测方法。

    FEC FRAME HEADER DESIGN FOR CABLE TELEVISION SIGNALS
    8.
    发明申请
    FEC FRAME HEADER DESIGN FOR CABLE TELEVISION SIGNALS 审中-公开
    有线电视信号的FEC帧头设计

    公开(公告)号：WO2010056357A3

    公开(公告)日：2010-07-29

    申请号：PCT/US2009006130

    申请日：2009-11-16

    Applicant: THOMSON LICENSING ,  GAO WEN ,  CHEN HOU-SHIN ,  KABUTZ MARTEN ,  ZHOU WEI

    Inventor： GAO WEN ,  CHEN HOU-SHIN ,  KABUTZ MARTEN ,  ZHOU WEI

    IPC: H04L1/00

    CPC classification number: H04L1/0057 ,  H04L1/0003 ,  H04L1/0072

    Abstract: Efficient and reliable FEC frame header improvements suitable for headers for data packets in a digital cable television transmission system are provided. In one embodiment, the DVB-C2 Standard, Adaptive Coding and Modulation (ACM) or Variable Coding and Modulation (VCM) is applied to each FEC block to provide as much flexibility as possible. As a result, a frame header is attached in front of each FEC frame to inform the coding rate, modulation type and physical layer pipe identifier. Besides the signaling of physical layer related information, the FEC frame header has to provide a structure so that it can be easily and reliably detected in the receiver. A frame header for Forward Error Correction (FEC) encoded frames is designed for use in the DVB-C2 Standard with an extra bit to convey additional information. The FEC frame block can also include the FEC header for the subsequent FEC data block to increase robustness. The power level of the FEC header can also be increased relative to the data portion. Different modulation methods can be used for the FEC frame header depending on the modulation method used for the FEC frame data portion. These techniques increase the flexibility and robustness of FEC header detection.

    Abstract translation: 提供了适用于数字有线电视传输系统中的数据分组报头的高效和可靠的FEC帧报头改进。 在一个实施例中，DVB-C2标准，自适应编码和调制（ACM）或可变编码和调制（VCM）被应用于每个FEC块以提供尽可能大的灵活性。 结果，帧头被附加在每个FEC帧的前面以通知编码率，调制类型和物理层管道标识符。 除了物理层相关信息的信令之外，FEC帧头还必须提供一种结构，以便在接收机中可以容易且可靠地检测到它。 用于前向纠错（FEC）编码帧的帧头设计用于DVB-C2标准，并带有额外的位以传送附加信息。 FEC帧块还可以包括用于后续FEC数据块的FEC头部以增加鲁棒性。 相对于数据部分，FEC头部的功率水平也可以增加。 取决于用于FEC帧数据部分的调制方法，不同的调制方法可以用于FEC帧头部。 这些技术增加了FEC头部检测的灵活性和鲁棒性。

    METHOD AND APPARATUS FOR DEMULTIPLEXER DESIGN FOR MULTLI-EDGE TYPE LDPC CODED MODULATION
    9.
    发明申请
    METHOD AND APPARATUS FOR DEMULTIPLEXER DESIGN FOR MULTLI-EDGE TYPE LDPC CODED MODULATION 审中-公开
    用于多边形类型LDPC编码调制的解复用器设计的方法和装置

    公开(公告)号：WO2010083038A2

    公开(公告)日：2010-07-22

    申请号：PCT/US2010000084

    申请日：2010-01-14

    Applicant: THOMSON LICENSING ,  LEI JING ,  GAO WEN

    Inventor： LEI JING ,  GAO WEN

    IPC: H04L1/00 ,  H03M13/27

    CPC classification number: H04L1/0057 ,  H03M13/033 ,  H03M13/1165 ,  H03M13/253 ,  H03M13/255 ,  H03M13/6552 ,  H03M13/6555 ,  H04L1/0041 ,  H04L1/0071

    Abstract: The capacity-achieving signaling strategy for a particular channel should consider the joint design of channel code and modulation. Nevertheless, coding theorists and practitioners have recognized that a well-designed LDPC code can achieve capacity-approaching performance universally across a range of data transmission and storage channels. A good example is the forward error correction scheme adopted recently by the second generation standards for digital video broadcasting (DVB), wherein the same LDPC code are expected to be reused over satellite, terrestrial and cable channels. However, to accommodate the spectral efficiency of each channel type, the coded bits should be mapped to the modulator judiciously. A large random bit interleaver is employed in BICM system, which typically yields good performance for an arbitrary choice of constellation mapper. However, it is problematic for high-speed implementation of coding and modulation due to the complexity. This motivates us to impose structural simplicity on the bit interleaver configuration so that the coded bits are de-multiplexed systematically into parallel groups to feed the constellation mapper. In this description, we focus on the design of bit demultiplexers for multilevel modulation by applying the framework of multi-edge type (MET) LDPC. Considering the channel-dependence of a given code ensemble is dominated by the mutual information between the channel input and output, we propose to simplify the analysis of the decoding behavior by using a set of surrogate binary erasure channels (BEC). Simulation results indicate that the proposed bit demultiplexer surpasses the performance of the interleaving strategy standardized in DVB-T2.

    Abstract translation: 特定信道的容量实现信令策略应考虑信道码和调制的联合设计。 然而，编码理论家和从业者已经认识到，精心设计的LDPC码可以在数据传输和存储信道的范围内普遍地实现容量接近的性能。 一个很好的例子是最近由数字视频广播（DVB）的第二代标准采用的前向纠错方案，其中相同的LDPC码预期将在卫星，地面和有线电视频道上重复使用。 然而，为了适应每个信道类型的频谱效率，编码比特应该被明智地映射到调制解调器。 在BICM系统中采用大的随机比特交织器，其通常对任意选择星座映射器产生良好的性能。 然而，由于复杂度，编码和调制的高速实现是有问题的。 这促使我们对比特交织器配置施加结构简单性，使得编码比特被系统地去多路复用成并行组以馈送星座映射器。 在本说明书中，我们专注于通过应用多边缘类型（MET）LDPC框架来设计用于多电平调制的位解复用器。 考虑到给定代码集合的通道依赖性由通道输入和输出之间的相互信息支配，我们建议通过使用一组替代二进制擦除通道（BEC）简化解码行为的分析。 仿真结果表明，所提出的比特解复用器超过DVB-T2标准化的交织策略的性能。

    ADAPTIVE SOFT DEMODULATION FOR RECEPTION OF DISTORTED SIGNALS
    10.
    发明申请
    ADAPTIVE SOFT DEMODULATION FOR RECEPTION OF DISTORTED SIGNALS 审中-公开
    用于接收失真信号的自适应软解调

    公开(公告)号：WO2004100475A3

    公开(公告)日：2005-01-13

    申请号：PCT/US2004013733

    申请日：2004-04-24

    Applicant: THOMSON LICENSING SA ,  KOSLOV JOSHUA ,  RAMASWAMY KUMAR ,  GAO WEN

    Inventor： KOSLOV JOSHUA ,  RAMASWAMY KUMAR ,  GAO WEN

    IPC: H04B7/185 ,  H04L1/00 ,  H04L25/06

    CPC classification number: H04B7/18517 ,  H04L1/0016 ,  H04L1/005 ,  H04L27/366

    Abstract: A satellite communications system comprises a transmitting ground station, including a transmitter and a receiver, a satellite transponder and a receiving ground station. The transmitter transmits an uplink signal to the satellite transponder, which broadcasts the received uplink signal as a downlink signal to the receiving ground station. The transmitting ground station monitors the downlink signal through the receiver and calculates log-likelihood ratios (LLRs) as a function of the monitored downlink signal. These LLRs are illustratively stored in a look-up table, which are then transmitted to the receiving ground station for use in recovering data from a received data signal.

    Abstract translation: 一种卫星通信系统包括一个发射地面站，包括发射机和接收机，卫星转发器和接收地面站。 发射机向卫星转发器发送上行链路信号，卫星转发器将接收到的上行链路信号作为下行链路信号广播到接收地面站。 发射地面站通过接收机监测下行链路信号，并根据被监视的下行链路信号计算对数似然比（LLR）。 这些LLR被示例性地存储在查找表中，然后将其发送到接收地面站，以用于从接收的数据信号恢复数据。

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