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1. 发明申请

WO2012115805A3 APPARATUS, SYSTEMS AND METHODS UTILIZING ADJACENT-CHANNEL POWER DEPENDENT AUTOMATIC GAIN CONTROL FOR DIGITAL TELEVISION DEMODULATION 审中-公开
公开(公告)号：WO2012115805A3
公开(公告)日：2012-08-30
申请号：PCT/US2012/024711
申请日：2012-02-10
申请人： INTEL CORPORATION , SHUKLA, Parveen K. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , GAMAGE, Sahan S.
发明人： SHUKLA, Parveen K. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , GAMAGE, Sahan S.
IPC分类号： H04N5/52 , H04N5/50
摘要： 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.

2. 发明申请

WO2012074695A1 FREQUENCY AND TIMING OFFSET ESTIMATION ALGORITHM FOR DTV (DVB-T2/DVB-T/ISDB-T) RECEIVERS 审中-公开
标题翻译： DTV（DVB-T2 / DVB-T / ISDB-T）接收机的频率和时序偏移估计算法
公开(公告)号：WO2012074695A1
公开(公告)日：2012-06-07
申请号：PCT/US2011/059929
申请日：2011-11-09
申请人： INTEL CORPORATION , GAMAGE, Sahan S. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K.
发明人： GAMAGE, Sahan S. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K.
IPC分类号： H04L27/26 , H04N17/00
CPC分类号： H04L27/2657 , H04L27/2666 , H04L27/2672 , H04L27/2675 , H04L27/2688 , H04L2027/003 , H04L2027/0055 , H04L2027/0065 , H04L2027/0091
摘要： According to various embodiments, a method is disclosed that includes determining, by a receiver, a frequency offset in a signal comprising a set of orthogonal frequency division multiplexed (OFDM) symbols by determining a first difference in phase angles between a nth OFDM symbol and a n th +1 OFDM symbol on a common OFDM carrier and a first difference in phase angles between the n th +1 OFDM symbol and a n th +2 OFDM symbol on the common OFDM carrier and determining a second difference in phase angles between the first difference in phase angles between the n th OFDM symbol and the n th +1 OFDM system and the first difference in phase angles between the n th +1 OFDM symbol and the n th +2 OFDM symbol to identify the frequency offset, wherein nε{1,..., N}; and correcting, by the receiver, the signal using the determined frequency offset.
摘要翻译：根据各种实施例，公开了一种方法，其包括由接收机确定包括一组正交频分复用（OFDM）符号的信号中的频率偏移，其通过确定第n个OFDM符号和第n个OFDM符号之间的相位角的第一差异第n + 1个OFDM符号和公共OFDM载波上的第n + 1个OFDM符号和第n + 2个OFDM符号之间的相位角的第一差异，并确定第一相位差之间的相位角的第二差异第n个OFDM符号和第n + 1个OFDM系统之间的角度以及第n + 1个OFDM符号和第n + 2个OFDM符号之间的相位角的第一个差异，以识别频率偏移，其中ne {1，...，N }; 以及由所述接收机使用所确定的频率偏移校正所述信号。

3. 发明申请

WO2013095353A1 AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEX (OFDM) RECEIVER WITH PHASE NOISE MITIGATION AND REDUCED LATENCY 审中-公开
标题翻译：具有相位噪声缓解和减少延迟的正交频分多址（OFDM）接收机
公开(公告)号：WO2013095353A1
公开(公告)日：2013-06-27
申请号：PCT/US2011/065978
申请日：2011-12-20
申请人： INTEL CORPORATION , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K. , GAMAGE, Sahan S.
发明人： ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K. , GAMAGE, Sahan S.
IPC分类号： H04L27/26 , H04B15/00
CPC分类号： H04L27/2649 , H04L1/0036 , H04L27/265 , H04L27/2657 , H04L27/2675
摘要： A system according to one embodiment includes a demodulator configured to receive an orthogonal frequency division multiplexed (OFDM) modulated signal comprising a current symbol and a sequence of previous symbols, each of the symbols comprising one or more pilot sub-carriers and one or more data sub-carriers; a phase angle computation circuit coupled to the demodulator, the phase angle computation circuit configured to compute a first mean, the first mean computed from the phase angle of one or more of the pilot sub-carriers of a predetermined number of the previous symbols; a predictive filter circuit coupled to the phase angle computation circuit, the predictive filter circuit configured to compute a second mean, the second mean estimating the phase angle of one or more sub-carriers of the current symbol, the estimation based on the first mean; and a phase noise cancelling circuit coupled to the predictive filter circuit, the phase noise cancelling circuit configured to correct the phase of one or more sub-carriers of the current symbol based on the second mean.
摘要翻译：根据一个实施例的系统包括解调器，其被配置为接收包括当前符号和先前符号序列的正交频分复用（OFDM）调制信号，每个符号包括一个或多个导频子载波和一个或多个数据子载波; 耦合到所述解调器的相位角计算电路，所述相位角计算电路被配置为计算第一平均值，所述第一平均值是从预定数量的先前符号的一个或多个导频子载波的相位角计算的第一平均值; 耦合到所述相位角计算电路的预测滤波器电路，所述预测滤波器电路被配置为计算第二平均值，所述第二平均值估计所述当前符号的一个或多个子载波的相位角，所述估计基于所述第一均值; 以及耦合到所述预测滤波器电路的相位噪声消除电路，所述相位噪声消除电路被配置为基于所述第二均值来校正所述当前符号的一个或多个子载波的相位。

4. 发明申请

WO2012027303A2 CHANNEL-ADAPTIVE LIKELIHOOD DETERMINATION 审中-公开
标题翻译：频道自适应确定
公开(公告)号：WO2012027303A2
公开(公告)日：2012-03-01
申请号：PCT/US2011/048699
申请日：2011-08-22
申请人： INTEL CORPORATION , GAMAGE, Sahan S. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K. , BHUNJUN, Vinesh
发明人： GAMAGE, Sahan S. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , SHUKLA, Parveen K. , BHUNJUN, Vinesh
IPC分类号： H04L27/26
CPC分类号： H04L25/067
摘要： Methods and systems to compute likelihood measures of demodulated, complex-coordinate data points, to and dynamically scale the likelihood measures as a function of a channel statistic, and to decode the data points from the scaled likelihood measures. Likelihood measures may be computed relative to all points, or a subset of points of a reference constellation, such as a subset of one or more nearest constellation points. Likelihood measures may be scaled as a function of a channel frequency response variance amongst a plurality of carriers, such as carriers of an OFDM signal, and/or as a function of a channel impulse response variance.
摘要翻译：用于计算解调的复坐标数据点的似然度量的方法和系统，并将似然度量动态地缩放为通道统计量的函数，并且从经比例缩放的似然度量来解码数据点。可以相对于所有点或参考星座的点的子集（诸如一个或多个最近星座点的子集）计算似然度量。似然度量可以被缩放为多个载波之类的信道频率响应方差的函数，诸如OFDM信号的载波，和/或作为信道脉冲响应方差的函数。

5. 发明申请

WO2012027061A2 METHODS AND SYSTEMS TO RESOLVE CYCLIC AMBIGUITY OF A CHANNEL IMPULSE RESPONSE 审中-公开
标题翻译：用于解决信道脉冲响应的循环模糊的方法和系统
公开(公告)号：WO2012027061A2
公开(公告)日：2012-03-01
申请号：PCT/US2011/045775
申请日：2011-07-28
申请人： INTEL CORPORATION , HEWAVITHANA, Thushara , ARAMBEPOLA, Bernard , SHUKLA, Parveen K. , GAMAGE, Sahan S. , BHUNJUN, Vinesh
发明人： HEWAVITHANA, Thushara , ARAMBEPOLA, Bernard , SHUKLA, Parveen K. , GAMAGE, Sahan S. , BHUNJUN, Vinesh
IPC分类号： H04L27/26
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/0228 , H04L27/2647
摘要： Methods and systems to resolve cyclic ambiguity of a scattered-pilot based channel impulse response as a function of transmission parameter signalling (TPS), such as in a single frequency network, including to zero-pad a first orientation of the channel impulse response to an interval of an effective symbol duration of the multi-carrier signal, compute a channel frequency response from the zero-padded first orientation of the channel impulse response, and correlate components of the channel frequency response corresponding to frequencies of TPS carriers with raw channel frequency response data of obtained from the TPS carriers. Frequency response components of multiple zero-padded orientations of the channel impulse response may be correlated with the raw TPS carrier data to identify an optimum orientation of the channel impulse response. Frequency response components of subsequent zero-padded orientations may be iteratively computed from components of preceding orientations.
摘要翻译：用于解决作为传输参数信令（TPS）的函数的基于分散导频的信道脉冲响应的循环模糊度的方法和系统，诸如在单频网络中，包括将第一将信道脉冲响应的方向定位到多载波信号的有效符号持续时间的间隔，从信道脉冲响应的零填充的第一方位计算信道频率响应，并将信道频率响应的分量与频率相对应 TPS载波的原始信道频率响应数据从TPS载波中获得。信道脉冲响应的多个零填充方位的频率响应分量可以与原始TPS载波数据相关以识别信道脉冲响应的最佳方位。随后的零填充方位的频率响应分量可以从先前方位的分量迭代计算。

6. 发明申请

WO2013074119A1 INTER CARRIER INTERFERENCE CANCELLATION FOR ORTHOGONAL FREQUENCY DOMAIN MULTIPLEXING RECEIVERS 审中-公开
标题翻译：正交频域多路复用接收机的双载波干扰消除
公开(公告)号：WO2013074119A1
公开(公告)日：2013-05-23
申请号：PCT/US2011/061405
申请日：2011-11-18
申请人： INTEL CORPORATION , HEWAVITHANA, Thushara , SHUKLA, Parveen K. , ARAMBEPOLA, Bernard
发明人： HEWAVITHANA, Thushara , SHUKLA, Parveen K. , ARAMBEPOLA, Bernard
IPC分类号： H04L27/26 , H04L27/01 , H04L1/00
CPC分类号： H04B1/10 , H04L1/005 , H04L25/022 , H04L25/03159 , H04L25/03821 , H04L27/2647
摘要： Apparatus and methods are described to perform inter carrier interference (ICI) reduction or cancellation in an orthogonal frequency domain multiplexing (OFDM) receiver. A first and a second stage of ICI cancellation may be performed before inputting an estimated transmitted data carrier for forward error correction. Forward error correction may include a signal re-correction and reconstruction of the estimated transmitted data carrier prior to a further stage of ICI cancellation.
摘要翻译：描述了在正交频域复用（OFDM）接收机中执行载波间干扰（ICI）减少或消除的装置和方法。可以在输入用于前向纠错的估计的发送数据载体之前执行ICI取消的第一和第二阶段。前向纠错可以包括在ICI取消的进一步阶段之前的估计的传输数据载体的信号重新校正和重构。

7. 发明申请

WO2012087445A1 CHANNEL ESTIMATION FOR DVB-T2 DEMODULATION USING AN ADAPTIVE PREDICTION TECHNIQUE 审中-公开
标题翻译：使用自适应预测技术的DVB-T2解调的信道估计
公开(公告)号：WO2012087445A1
公开(公告)日：2012-06-28
申请号：PCT/US2011/059925
申请日：2011-11-09
申请人： INTEL CORPORATION , SHUKLA, Parveen K. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , GAMAGE, Shahan S.
发明人： SHUKLA, Parveen K. , ARAMBEPOLA, Bernard , HEWAVITHANA, Thushara , GAMAGE, Shahan S.
IPC分类号： H04L27/26 , H04N17/00
CPC分类号： H04L25/022 , H04L25/0226 , H04L25/0232 , H04L25/025 , H04L27/2647
摘要： According to various embodiments, a method is disclosed that includes receiving an orthogonal frequency-division multiplexing (OFDM) modulated signal at a modulator; filtering the received modulated signal using a plurality of sets of filter coefficients with a linear predictor algorithm; and estimating a channel frequency response based on the filtering.
摘要翻译：根据各种实施例，公开了一种在调制器处接收正交频分复用（OFDM）调制信号的方法; 使用具有线性预测器算法的多组滤波器系数对所接收的调制信号进行滤波; 以及基于所述滤波来估计信道频率响应。

8. 发明申请

WO2014065894A1 METHODS AND SYSTEMS TO MITIGATE IMPULSE INTERFERENCE 审中-公开
标题翻译：减轻干扰的方法和系统
公开(公告)号：WO2014065894A1
公开(公告)日：2014-05-01
申请号：PCT/US2013/047348
申请日：2013-06-24
申请人： INTEL CORPORATION , HEWAVITHANA, Thushara , ARAMBEPOLA, Bernard , GAMAGE, Sahan S.
发明人： HEWAVITHANA, Thushara , ARAMBEPOLA, Bernard , GAMAGE, Sahan S.
IPC分类号： H04L27/34 , H04L12/26
CPC分类号： H04L27/38 , H04L25/067 , H04L27/2649
摘要： 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.
摘要翻译：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。

9. 发明申请

WO2014105132A1 SYSTEMS AND METHODS FOR IMPLEMENTING SOFT-DECISION REED-SOLOMON DECODING TO IMPROVE CABLE MODEM AND CABLE GATEWAY PERFORMANCE 审中-公开
标题翻译：实施软决策解决方案改进电缆调制解调器和电缆网关性能的系统和方法
公开(公告)号：WO2014105132A1
公开(公告)日：2014-07-03
申请号：PCT/US2013/046306
申请日：2013-06-18
申请人： INTEL CORPORATION , ARAMBEPOLA, Bernard , BADEM, Murat , SHUKLA, Parveen K. , GAMAGE, Sahan , HEWAVITHANA, Thushara , GOLDMAN, Naor
发明人： ARAMBEPOLA, Bernard , BADEM, Murat , SHUKLA, Parveen K. , GAMAGE, Sahan , HEWAVITHANA, Thushara , GOLDMAN, Naor
IPC分类号： H03M13/00 , H04L27/34
CPC分类号： H04L27/06 , H03M13/1515 , H03M13/451 , H03M13/453 , H04L1/0045 , H04L1/0047 , H04L1/0057 , H04L27/38
摘要： 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. At 1024-QAM, a receiver is provided in which a signal to noise ratio is reduced by at least about 1 dB relaxing design considerations and specifications for other components in the system including for the tuner. A soft-RS-symbol generation scheme is provided to enable soft-input RC decoding 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. A typical receiver hardware requirement in an FEC module to implement the disclosed scheme may be comparatively modest, e.g., on an order of approximately 50K gates.
摘要翻译：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。在1024-QAM中，提供了一种接收机，其中信噪比降低了包括用于调谐器的系统中其他部件的至少约1dB的松弛设计考虑和规格。提供软RS符号生成方案以在连接到QAM解调器的前向纠错（FEC）模块中实现软输入RC解码。实现RS解码方案，而不会使硬件或处理开销显着复杂化。用于实现所公开的方案的FEC模块中的典型接收机硬件要求可以是相对适中的，例如大约50K门的量级。

10. 发明申请

WO2014098978A1 SYSTEMS AND METHODS FOR IMPLEMENTING PEAK-TO-AVERAGE POWER RATIO REDUCTION FOR OFDMA MODULATION 审中-公开
标题翻译：用于实施OFDMA调制的峰值平均功率比减少的系统和方法
公开(公告)号：WO2014098978A1
公开(公告)日：2014-06-26
申请号：PCT/US2013/046135
申请日：2013-06-17
申请人： INTEL CORPORATION , ARAMBEPOLA, Bernard , SHUKLA, Parveen , HEWAVITHANA, Thushara , GAMAGE, Sahan
发明人： ARAMBEPOLA, Bernard , SHUKLA, Parveen , HEWAVITHANA, Thushara , GAMAGE, Sahan
IPC分类号： H04L27/26 , H04W52/02
CPC分类号： H04L27/2614 , H04L5/0044
摘要： A system and method are provided for implementing a peak-to-average power ratio (PAPR) reduction scheme for Orthogonal Frequency-Division Multiple Access (OFDMA) modulation. A unique PAPR reduction scheme for OFDMA modulation for systems operated according to a DOCSIS standard achieves results similar to those attributable to tone reservation schemes in a manner that does not negatively affect an amount of available data capacity, particularly in implementations with limited numbers of subcarriers. The disclosed systems and methods are particularly adaptable to next generation cable gateways and/or next generation cable modems. These next generation cable gateways and/or cable modems may find particular utility in advanced hybrid fiber/coaxial cable systems. The adaptable cable gateways/modems may include a cable gateway system-on-chip (SOC) configuration. The disclosed schemes may be applicable to OFDM modulation. For OFDM, however, the known tone reservation algorithms also may be employed.
摘要翻译：提供了一种用于实现用于正交频分多址（OFDMA）调制的峰均功率比（PAPR）降低方案的系统和方法。用于根据DOCSIS标准操作的系统的OFDMA调制的独特的PAPR降低方案实现了类似于对于音调预留方案的结果的结果，其结果不会不利地影响可用数据容量的数量，特别是在具有有限数目的子载波的实现中。所公开的系统和方法特别适用于下一代电缆网关和/或下一代电缆调制解调器。这些下一代电缆网关和/或电缆调制解调器可以在先进的混合光纤/同轴电缆系统中发现特定的用途。可适应性的电缆网关/调制解调器可以包括电缆网关片上系统（SOC）配置。所公开的方案可以适用于OFDM调制。然而，对于OFDM，也可以采用已知的音调预留算法。

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