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1. 发明申请

US20200244505A1 CLOCK SYNCHRONIZATION AND OFDM SYMBOL TIMING SYNCHRONIZATION ALGORITHM AND ARCHITECTURE FOR DATA OVER CABLE SERVICE INTERFACE SPECIFICATION (DOCSIS) FULL DUPLEX (FDX) CABLE MODEM (CM) TO ENABLE FAST RECOVERY OF DOWNSTREAM CHANNELS FOLLOWING AN EXTENDED DOWNSTREAM FREEZE 审中-公开
公开(公告)号：US20200244505A1
公开(公告)日：2020-07-30
申请号：US16774349
申请日：2020-01-28
申请人： Intel Corporation
发明人： Thushara Hewavithana , Noam Tal , Boaz Kol , Murti Devarakonda
IPC分类号： H04L27/26 , H04L27/00 , H04L27/38
摘要： A modem circuit associated with a communication system is disclosed. The modem circuit comprises a symbol tracking circuit configured to track a symbol timing associated with a downstream (DS) channel associated with the modem circuit, in accordance with a timing offset estimate. In some embodiments, the timing offset estimate comprises a unified timing offset derived based on one or more external channels associated with the modem circuit that is different from the DS channel. The symbol tracking circuit is further configured to apply a sample rate correction to a DS signal associated with the DS channel, based on the timing offset estimate comprising the unified timing offset, and apply a frequency correction to the DS signal, based on a frequency offset estimate comprising a unified frequency offset derived based on the one or more external channels.

2. 发明申请

US20220021475A1 CONFIGURABLE CONSTELLATION MAPPING TO CONTROL SPECTRAL EFFICIENCY VERSUS SIGNAL-TO-NOISE RATIO 有权
公开(公告)号：US20220021475A1
公开(公告)日：2022-01-20
申请号：US17383698
申请日：2021-07-23
申请人： Intel Corporation
发明人： Bernard Arambepola , Noam Tal , Sahan S. Gamage , Thushara Hewavithana , Shaul Shulman
IPC分类号： H04L1/00 , H04L5/00 , H04L27/00 , H04L27/26
摘要： Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

3. 发明授权

US09634795B2 Configurable constellation mapping to control spectral efficiency versus signal-to-noise ratio 有权
公开(公告)号：US09634795B2
公开(公告)日：2017-04-25
申请号：US14197208
申请日：2014-03-04
申请人： Intel Corporation
发明人： Bernard Arambepola , Noam Tal , Sahan S. Gamage , Thushara Hewavithana , Shaul Shulman
IPC分类号： H04W4/00 , H04L1/00 , H04L5/00 , H04L27/00 , H04L27/26
CPC分类号： H04L1/004 , H04L1/0041 , H04L5/0046 , H04L27/0008 , H04L27/2634
摘要： Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

4. 发明授权

US08976904B2 Automated erasure slicer threshold control and modification of symbol estimates to be erased 有权
标题翻译：自动擦除切片器阈值控制和修改要擦除的符号估计
公开(公告)号：US08976904B2
公开(公告)日：2015-03-10
申请号：US13631229
申请日：2012-09-28
申请人： Intel Corporation
发明人： Noam Tal
IPC分类号： H04L27/38
CPC分类号： H04L25/0307 , H04L25/063 , H04L2025/0342 , H04L2025/03694
摘要： Methods and systems to vary an erasure slicer threshold based on a measure computed from prior soft and/or hard symbol decisions, identify reliable symbol estimates based on the threshold, identify unreliable symbol estimates for erasure based on the threshold, modify the identified symbol estimates, output the reliable symbol estimates and the modified symbol estimates as erasure slicer decisions, and filter the decisions in a feedback filter of a decision feedback equalizer (DFE). The erasure slicer threshold may be based on signal-to-noise ratio (SNR) or mean-squared-error (MSE). A symbol estimate may be identified for erasure when a coordinate of the corresponding soft decision is within an erasure area defined by the threshold. Symbol modification may include replacing a corresponding coordinate of the symbol estimate with a coordinate of a decision boundary associated with the erasure area.
摘要翻译：基于从先前的软和/或硬符号判定计算的测量值来改变擦除限幅器阈值的方法和系统，基于阈值识别可靠的符号估计，基于阈值识别用于擦除的不可靠符号估计，修改所识别的符号估计，将可靠的符号估计和修改的符号估计作为擦除限制器决定输出，并对判决反馈均衡器（DFE）的反馈滤波器中的判定进行滤波。擦除限幅器阈值可以基于信噪比（SNR）或均方误差（MSE）。当相应的软判决的坐标在由阈值定义的擦除区域内时，可以识别符号估计用于擦除。符号修改可以包括使用与擦除区域相关联的判定边界的坐标替换符号估计的对应坐标。

5. 发明申请

US20200228162A1 SIGNALING METHOD FOR INTERFERENCE GROUP DISCOVERY IN CABLE MODEMS 审中-公开
公开(公告)号：US20200228162A1
公开(公告)日：2020-07-16
申请号：US16833818
申请日：2020-03-30
申请人： Intel Corporation
发明人： Bernard Arambepola , Thushara Hewavithana , Noam Tal , Shaul Shulman
IPC分类号： H04B3/46 , H04B3/32 , H04B3/487 , H04N21/61 , H04L12/28 , H04L12/26 , H04B17/345
摘要： A cable modem system for discovering interference groups (IGs) includes an infrastructure and a cable modem termination system (CMTS). The infrastructure is for transferring data. The CMTS is configured to initiate generation of test signals by a set of cable modems (CMs), obtain a set of test measurements for the set of CMs, discover interference groups (IGs) of the set of CMs based on the obtained set of test measurements and assign a plurality of upstream and downstream channels for the set of CMs that use orthogonal frequency division multiplexing (OFDM) based on the discovered IGs.

6. 发明申请

US20200162230A1 Cable modem and digital compensation for switchable analog filter to assist echo cancellation in full duplex cable modem 审中-公开
公开(公告)号：US20200162230A1
公开(公告)日：2020-05-21
申请号：US16601611
申请日：2019-10-15
申请人： Intel Corporation
发明人： Boaz Kol , Noam Tal , Shaul Shulman , Thushara Hewavithana
IPC分类号： H04L5/14 , H04B3/21 , H04L27/00 , H04L27/148
摘要： A cable modem supporting full duplex (FDX) operations. The cable modem includes a transmit circuitry configured to process a transmit signal and a receive circuitry configured to process a receive signal. The receive circuitry includes a switchable analog filter configured to filter the receive signal. The switchable analog filter is configurable for different passband frequencies. The receive circuitry also includes a digital compensation filter configured to compensate a difference in frequency response in a specific frequency band due to switching of the switchable analog filter for a different passband frequency. The cable modem also includes an adjacent channel interference (ACI) cancellation filter and an adjacent leakage interference (ALI) cancellation filter. A digital compensation filter is also used in processing the ACI cancellation signal and the ALI cancellation signal to impose or compensate the difference in frequency response due to the switchable analog filter switching.

7. 发明申请

US20190173609A1 CONFIGURABLE CONSTELLATION MAPPING TO CONTROL SPECTRAL EFFICIENCY VERSUS SIGNAL-TO-NOISE RATIO 审中-公开
公开(公告)号：US20190173609A1
公开(公告)日：2019-06-06
申请号：US16177219
申请日：2018-10-31
申请人： Intel Corporation
发明人： Bernard Arambepola , Noam Tal , Sahan S. Gamage , Thushara Hewavithana , Shaul Shulman
IPC分类号： H04L1/00 , H04L27/00 , H04L27/26 , H04L5/00
摘要： Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

8. 发明授权

US11075713B2 Configurable constellation mapping to control spectral efficiency versus signal-to-noise ratio 有权
公开(公告)号：US11075713B2
公开(公告)日：2021-07-27
申请号：US16714640
申请日：2019-12-13
申请人： Intel Corporation
发明人： Bernard Arambepola , Noam Tal , Sahan S. Gamage , Thushara Hewavithana , Shaul Shulman
IPC分类号： H04W4/00 , H04L1/00 , H04L5/00 , H04L27/00 , H04L27/26
摘要： Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

9. 发明申请

US20180287660A1 SIGNALING METHOD FOR INTERFERENCE GROUP DISCOVERY IN CABLE MODEMS 审中-公开
公开(公告)号：US20180287660A1
公开(公告)日：2018-10-04
申请号：US15475448
申请日：2017-03-31
申请人： Intel Corporation
发明人： Bernard Arambepola , Thushara Hewavithana , Noam Tal , Shaul Shulman
IPC分类号： H04B3/46 , H04B17/345
摘要： A cable modem system for discovering interference groups (IGs) includes an infrastructure and a cable modem termination system (CMTS). The infrastructure is for transferring data. The CMTS is configured to initiate generation of test signals by a set of cable modems (CMs), obtain a set of test measurements for the set of CMs, discover interference groups (IGs) of the set of CMs based on the obtained set of test measurements and assign a plurality of upstream and downstream channels for the set of CMs that use orthogonal frequency division multiplexing (OFDM) based on the discovered IGs.

10. 发明申请

US20180048417A1 CONFIGURABLE CONSTELLATION MAPPING TO CONTROL SPECTRAL EFFICIENCY VERSUS SIGNAL-TO-NOISE RATIO 审中-公开
公开(公告)号：US20180048417A1
公开(公告)日：2018-02-15
申请号：US15790807
申请日：2017-10-23
申请人： Intel Corporation
发明人： Bernard Arambepola , Noam Tal , Sahan S. Gamage , Thushara Hewavithana , Shaul Shulman
IPC分类号： H04L1/00 , H04L5/00 , H04L27/00 , H04L27/26
CPC分类号： H04L1/004 , H04L1/0041 , H04L5/0046 , H04L27/0008 , H04L27/2634
摘要： Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

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