公开(公告)号：US08929471B2

公开(公告)日：2015-01-06

申请号：US13661817

申请日：2012-10-26

Applicant: Intel Corporation

Inventor： Thushara Hewavithana ,  Bernard Arambepola ,  Sahan Gamage

IPC: H04L5/12 ,  H04L23/02

CPC classification number: H04L27/38 ,  H04L25/067 ,  H04L27/2649

Abstract: Methods and systems to mitigate impulse interference in an OFDM QAM signal. A per-symbol noise measure, or quality measure (QM) is computed for a symbol k as a MSE of distances between carriers in the symbol and points of corresponding QAM constellations. MSE(k) is averaged over multiple symbols to compute a background signal QM, AVG_MSE(k). If MSE(k) exceeds AVG_MSE(k) by a moderate amount, symbol k may be moderately affected by impulse interference, and per-carrier SNR estimates are downgraded for all data carriers in symbol k, prior to LLR computation. SNR downgrading may be linear or step-wise based on an extent to which MSE(k) exceeds AVG_MSE(k). If MSE(k) exceeds AVG_MSE(k) by a significant amount, symbol k may be significantly affected by impulse interference, and LLRs may be set to indicate that all data carriers are erased in symbol k.

Abstract translation: 减少OFDM QAM信号脉冲干扰的方法和系统。 针对符号k计算每符号噪声测量或质量测量（QM），作为符号中的载波与相应QAM星座的点之间的距离的MSE。 MSE（k）在多个符号之间进行平均以计算背景信号QM，AVG_MSE（k）。 如果MSE（k）超过AVG_MSE（k）中等量，则符号k可能受脉冲干扰的适度影响，并且在LLR计算之前，符号k中的所有数据载波的每载波SNR估计被降级。 基于MSE（k）超过AVG_MSE（k）的程度，SNR降级可以是线性的或逐步的。 如果MSE（k）超过AVG_MSE（k）大量，则符号k可能受脉冲干扰的显着影响，并且可以将LLR设置为指示所有数据载体在符号k中被擦除。

公开(公告)号：US08908810B2

公开(公告)日：2014-12-09

申请号：US13728022

申请日：2012-12-27

Applicant: Intel Corporation

Inventor： Bernard Arambepola ,  Murat Badem ,  Parveen K. Shukla ,  Sahan Gamage ,  Thushara Hewavithana ,  Naor Goldman

IPC: H04L27/38 ,  H04L27/06 ,  H04L1/00

CPC classification number: H04L27/06 ,  H03M13/1515 ,  H03M13/451 ,  H03M13/453 ,  H04L1/0045 ,  H04L1/0047 ,  H04L1/0057 ,  H04L27/38

Abstract: A system and method are provided for implementing a soft Reed-Solomon (RS) decoding scheme, technique or algorithm to improve physical layer performance in cable modems and cable gateways. The algorithm is implemented in a forward error correction (FEC) module connected to a QAM demodulator. The RS decoding scheme is implemented without significantly complicating hardware or processing overhead. The soft Reed-Solomon (RS) decoding scheme extracts candidate RS symbols and their Log Likelihood Ratios (LLRs) from QAM symbols. The set of highest probable candidate blocks are then chosen and these are decoded using a variant of the Chase algorithm until a valid codeword is detected at the decoder output.

Abstract translation: 提供了一种用于实现软的里德 - 所罗门（RS）解码方案，技术或算法以改善电缆调制解调器和电缆网关中的物理层性能的系统和方法。 该算法在连接到QAM解调器的前向纠错（FEC）模块中实现。 实现RS解码方案，而不会使硬件或处理开销显着复杂化。 软里德 - 所罗门（RS）解码方案从QAM符号中提取候选RS符号及其对数似然比（LLR）。 然后选择最高可能候选块的集合，并且使用Chase算法的变体对这些候选块进行解码，直到在解码器输出处检测到有效码字。

公开(公告)号：US08817195B2

公开(公告)日：2014-08-26

申请号：US14047098

申请日：2013-10-07

Applicant: Intel Corporation

Inventor： Parveen K. Shukla ,  Bernard Arambepola ,  Thushara Hewavithana ,  Sahan Gamage

IPC: H04N5/52

CPC classification number: H04N5/455 ,  H04N5/52 ,  H04N21/4382 ,  H04N21/6112

Abstract: An embodiment of the present invention provides a method for digital television demodulation, comprising using adjacent-channel power dependent automatic gain control (AGC) for the digital television demodulation, wherein an AGC technique takes into account a total power as well as power of adjacent channels to control gain of a gain control amplifier.

Abstract translation: 本发明的一个实施例提供一种用于数字电视解调的方法，包括对数字电视解调使用相邻信道功率依赖自动增益控制（AGC），其中AGC技术考虑到相邻信道的总功率和功率 以控制增益控制放大器的增益。