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11. 发明申请

US20160248531A1 NONLINEARITY COMPENSATION FOR RECEPTION OF OFDM SIGNALS 审中-公开
公开(公告)号：US20160248531A1
公开(公告)日：2016-08-25
申请号：US15050550
申请日：2016-02-23
申请人： MagnaCom Ltd.
发明人： Amir Eliaz , Ilan Reuven
IPC分类号： H04J11/00 , H04B17/391 , H04L25/03
CPC分类号： H04J11/0023 , H04B1/10 , H04B17/20 , H04B17/391 , H04B17/3912 , H04L1/20 , H04L25/03305 , H04L25/03821 , H04L27/2647 , H04L27/366 , H04L27/3863 , H04W16/14
摘要： An electronic receiver may comprise nonlinear distortion modeling circuitry, interference estimation circuitry, and sequence estimation circuitry. The receiver may receive an orthogonal frequency division multiplexing (OFDM) symbol in the form of an electromagnetic signal. The nonlinear distortion modeling circuitry may generate a nonlinear distortion model that models nonlinear distortion introduced to the received electromagnetic signal en route to the sequence estimation circuitry. The interference estimation circuitry may estimate inter-subcarrier interference present in the received OFDM symbol based on the generated nonlinear distortion model. The estimating of the inter-subcarrier interference may comprise applying the nonlinear distortion model to one or more candidate vectors generated by the sequence estimation circuitry. The sequence estimation circuitry may sequentially process a plurality of received virtual subcarrier values of the OFDM symbol using the estimated inter-subcarrier interference.

12. 发明授权

US09240908B2 Pilot pattern for observation scalar MIMO-OFDM 有权
标题翻译：用于观测标量MIMO-OFDM的导频模式
公开(公告)号：US09240908B2
公开(公告)日：2016-01-19
申请号：US13284890
申请日：2011-10-29
申请人： Muralidhar Karthik , George A. Vlantis
发明人： Muralidhar Karthik , George A. Vlantis
IPC分类号： H04L27/00 , H04L25/02 , H04L25/03 , H04L27/26
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a transmitter includes first and second transmission paths. The first transmission path is configurable to generate first pilot clusters each including a respective first pilot subsymbol in a first cluster position, and the second transmission path is configurable to generate second pilot clusters each including a respective second pilot subsymbol in a second cluster position such that a vector formed by the first pilot subsymbols is orthogonal to a vector formed by the second pilot subsymbols. For example, where such a transmitter transmits simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) over respective channels that may impart inter-carrier interference (ICI) to the signals due to Doppler spread, the pattern of the pilot symbols that compose the pilot clusters may allow a receiver of these signals to use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of these channels.
摘要翻译：在一个实施例中，发射机包括第一和第二传输路径。第一传输路径可配置为产生第一导频簇，每个导频簇包括在第一簇位置中的相应的第一导频子符号，并且第二传输路径可配置为生成第二导频簇，每个导频簇包括第二簇位置中的相应的第二导频子符号，使得由第一导频子符号形成的向量与由第二导频子符号形成的向量正交。例如，在这种发射机通过可能由于多普勒扩展而给予信号的载波间干扰（ICI）的相应信道上发射同时正交频分复用（OFDM）信号（例如，MIMO-OFDM信号）的情况下，构成导频簇的导频符号的模式可以允许这些信号的接收机使用诸如矢量状态标量观测（VSSO）卡尔曼算法的递归算法来估计这些信道的响应。

13. 发明授权

US09197476B2 Channel estimation in OFDM transmission system and method 有权
标题翻译： OFDM传输系统中的信道估计及方法
公开(公告)号：US09197476B2
公开(公告)日：2015-11-24
申请号：US14216885
申请日：2014-03-17
申请人： SiTune Corporation
发明人： Mahdi Khoshgard , Vahid Mesgarpour Toosi
IPC分类号： H04L27/26 , H04L5/00 , H04L25/02 , H04L25/03
CPC分类号： H04L27/2647 , H04L5/0007 , H04L5/0023 , H04L5/0048 , H04L5/005 , H04L5/0051 , H04L25/0232 , H04L25/03821 , H04L2025/03414
摘要： A system and method is provided for estimating the channel in OFDM transmission with inter-carrier interference (ICI). A channel in a data subcarrier in a subchannel shared between pilot subcarriers and data subcarriers can be estimated by performing interpolation based on estimated channels in pilot subcarriers in the same OFDM symbol as the subcarrier, such as through spline interpolation. A second estimate of the channel in the subcarrier can be produced by averaging an estimate of the channel in a subcarrier in the subchannel in a previous OFDM symbol and an estimate of the channel in a subcarrier in the subchannel in a succeeding OFDM symbol. A third estimate of the channel in the subcarrier can be produced through a linear combination of the first estimate and the second estimate. The channel in data subcarriers can be estimated through a weighted sum of the channel in nearest subcarriers.
摘要翻译：提供了一种用于利用载波间干扰（ICI）估计OFDM传输中的信道的系统和方法。例如通过样条插补，可以通过在与子载波相同的OFDM符号中的导频子载波中的估计信道执行内插来估计导频子载波和数据副载波之间共享的子信道中的数据子载波中的信道。子载波中的信道的第二估计可以通过对先前OFDM符号中的子信道中的子载波中的信道的估计和后续OFDM符号中的子信道中的子载波中的信道的估计进行平均来产生。可以通过第一估计和第二估计的线性组合来产生子载波中的信道的第三估计。可以通过最近子载波中的信道的加权和来估计数据子载波中的信道。

14. 发明授权

US09167385B2 Method and apparatus for ranging using channel estimation with interference rejection 有权
标题翻译：使用具有干扰抑制的信道估计的测距方法和装置
公开(公告)号：US09167385B2
公开(公告)日：2015-10-20
申请号：US14083150
申请日：2013-11-18
申请人： QUALCOMM Incorporated
发明人： Siavash Ekbatani
IPC分类号： H04W24/00 , H04W4/02 , H04L25/02 , H04L25/03 , H04W64/00
CPC分类号： H04W4/023 , H04L1/00 , H04L1/08 , H04L25/02 , H04L25/0204 , H04L25/0226 , H04L25/03821 , H04W64/00
摘要： A ranging procedure is performed using interference cancellation using preamble messages from a plurality of objects, each of which includes a pre-defined orthogonal design coded modulation patterns. A channel for an object may be estimated using the pre-defined orthogonal design coded modulation patterns in the preamble messages received from objects to remove interference of the preamble message received from other objects. A range to an object may be determined based on a determined delay in the preamble message from that object. The range may be used to assist in determining the position of the object. The pre-defined preamble message may be transmitted by receiving a schedule for an access point in a network for a ranging procedure and periodically transmitting a pre-defined preamble message for the ranging procedure, the pre-defined preamble message includes an orthogonal design coded modulation pattern.
摘要翻译：使用来自多个对象的前导码消息使用干扰消除来执行测距过程，每个对象包括预定义的正交设计编码调制模式。可以使用从对象接收的前导消息中的预定义正交设计编码调制模式来估计对象的信道，以消除从其他对象接收的前导码消息的干扰。可以基于来自该对象的前导码消息中确定的延迟来确定到对象的范围。该范围可以用于帮助确定物体的位置。可以通过接收针对测距过程的网络中的接入点的调度并周期性地发送用于测距过程的预定义的前导消息来发送预定义的前导消息，预定义的前导消息包括正交设计编码调制模式。

15. 发明授权

US09148311B2 Determining responses of rapidly varying MIMO-OFDM communication channels using observation scalars 有权
标题翻译：使用观测标量确定快速变化的MIMO-OFDM通信信道的响应
公开(公告)号：US09148311B2
公开(公告)日：2015-09-29
申请号：US13284879
申请日：2011-10-29
申请人： Muralidhar Karthik , George A. Vlantis
发明人： Muralidhar Karthik , George A. Vlantis
IPC分类号： H04K1/10 , H04L25/02 , H04L25/03 , H04L27/26
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a channel estimator includes first, second, and third stages. The first stage is configurable to generate a first observation scalar for a first communication path of a first communication channel, and the second stage is configurable to generate a second observation scalar for a first communication path of a second communication channel. And the third stage is configurable to generate channel-estimation coefficients in response to the first and second observation scalars. For example, such a channel estimator may use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of channels over which propagate simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) that suffer from inter-carrier interference (ICI) due to Doppler spread. Such a channel estimator may estimate the channel responses more accurately, more efficiently, with a less-complex algorithm, and with less-complex software or circuitry, than conventional channel estimators.
摘要翻译：在一个实施例中，信道估计器包括第一，第二和第三阶段。第一级可配置为生成第一通信信道的第一通信路径的第一观察标量，并且第二级可配置为生成第二通信信道的第一通信路径的第二观察标量。并且第三阶段可配置为响应于第一和第二观测标量产生信道估计系数。例如，这样的信道估计器可以使用诸如矢量状态标量观测（VSSO）卡尔曼算法的递归算法来估计传播的同时正交频分复用（OFDM）信号（例如， MIMO-OFDM信号），其由于多普勒扩展而受到载波间干扰（ICI）的影响。这样的信道估计器可以比传统的信道估计器更精确地，更有效地利用较不复杂的算法和不太复杂的软件或电路来估计信道响应。

16. 发明授权

US09130789B2 Recovering data from a secondary one of simultaneous signals, such as orthogonal-frequency-division-multiplexed (OFDM) signals, that include a same frequency 有权
标题翻译：从包括相同频率的同步信号（例如正交频分复用（OFDM））信号的辅助信号中恢复数据
公开(公告)号：US09130789B2
公开(公告)日：2015-09-08
申请号：US13560947
申请日：2012-07-27
申请人： Karthik Muralidhar , George A. Vlantis
发明人： Karthik Muralidhar , George A. Vlantis
IPC分类号： H04B1/40 , H04L25/02 , H04L25/03 , H04L27/26 , H04L5/00
CPC分类号： H04L25/022 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： An embodiment of a receiver includes a channel estimator and a data-recovery unit. The channel estimator is configured to determine a characteristic of a channel over which a first signal, which is received simultaneously with a second signal, propagated, the first and second signals respectively having first and second components that include approximately a frequency. And the data-recovery unit is configured to recover data from the first signal in response to the determined channel characteristic. For example, such a receiver may be able to receive simultaneously, and over the same channel space, orthogonal-frequency-division-multiplexed (OFDM) signals that include one or more of the same subcarrier frequencies, and to recover data from one or more of the OFDM signals despite the frequency overlap. A receiver with this capability may allow an increase in the effective bandwidth of the channel space, and thus may allow more devices to simultaneously share the channel space.
摘要翻译：接收机的实施例包括信道估计器和数据恢复单元。信道估计器被配置为确定与第二信号同时接收的第一信号传播的信道的特性，第一和第二信号分别具有包括大致频率的第一和第二分量。并且数据恢复单元被配置为响应于确定的信道特性从第一信号中恢复数据。例如，这样的接收机可能能够同时并且在同一信道空间上接收包括相同子载波频率中的一个或多个的正交频分复用（OFDM）信号，并且从一个或多个的OFDM信号，尽管频率重叠。具有该能力的接收机可以允许增加信道空间的有效带宽，因此可以允许更多设备同时共享信道空间。

17. 发明申请

US20150249554A1 ADAPTIVE DEMODULATION METHOD AND APPARATUS USING AN ARTIFICIAL NEURAL NETWORK TO IMPROVE DATA RECOVERY IN HIGH SPEED CHANNELS 审中-公开
标题翻译：使用人工神经网络的自适应解调方法和设备来提高高速通道中的数据恢复
公开(公告)号：US20150249554A1
公开(公告)日：2015-09-03
申请号：US14714536
申请日：2015-05-18
申请人： Dhadesugoor Vaman , Oluwatobi Olabiyi
发明人： Dhadesugoor Vaman , Oluwatobi Olabiyi
IPC分类号： H04L25/03
CPC分类号： H04L25/03165 , H04L25/03006 , H04L25/03019 , H04L25/03159 , H04L25/03821 , H04L2025/03636
摘要： A neural network demodulator is used within a receiver to provide Inter Symbol Interference (ISI) channel equalization and to correct for I/Q/phase imbalance. The neural network is trained with a single integrated training step to simultaneously handle the channel impairments of ISI equalization and I/Q phase imbalance as opposed to prior art methods of separately addressing each channel impairment in sequence.
摘要翻译：在接收机内使用神经网络解调器来提供信号间干扰（ISI）信道均衡，并纠正I / Q /相位不平衡。训练神经网络采用单一的综合训练步骤，以同时处理ISI均衡和I / Q相不平衡的信道损伤，而不是依次单独寻址每个信道损伤的现有技术方法。

18. 发明授权

US09083573B2 Simultaneous transmission of signals, such as orthogonal-frequency-division-multiplexed (OFDM) signals, that include a same frequency 有权
标题翻译：包括相同频率的诸如正交频分复用（OFDM）信号的信号的同时传输
公开(公告)号：US09083573B2
公开(公告)日：2015-07-14
申请号：US13560928
申请日：2012-07-27
申请人： Karthik Muralidhar , George A. Vlantis
发明人： Karthik Muralidhar , George A. Vlantis
IPC分类号： H04L27/00 , H04L25/02 , H04L25/03 , H04L27/26 , H04L27/12
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/122 , H04L27/2601
摘要： An embodiment of a transmitter includes detection, generating, and transmission stages. The detection stage is configured to detect a first signal having a first component that includes a frequency, and the generating stage is configured to generate a data component that includes approximately the frequency in response to the detection of the first signal. The transmission stage is configured to transmit a second signal having the data component while the detection stage is detecting the first signal. For example, two or more such transmitters (e.g., two or more smart phones) may simultaneously transmit OFDM signals on the same subcarrier frequencies and over the same channel space. By allowing the simultaneous transmission of multiple signals on the same frequencies and over the same channel space, such a transmitter may increase the effective bandwidth of the channel space, and thus may allow more devices to simultaneously share the same channel space.
摘要翻译：发射机的实施例包括检测，产生和传输阶段。检测级被配置为检测具有包括频率的第一分量的第一信号，并且生成级被配置为响应于第一信号的检测而生成包括大致频率的数据分量。发送级被配置为在检测级检测到第一信号的同时发送具有数据分量的第二信号。例如，两个或更多个这样的发射器（例如，两个或更多个智能电话）可以在相同的子载波频率上和相同的信道空间上同时发送OFDM信号。通过允许在相同频率和相同信道空间上同时传输多个信号，这样的发射机可以增加信道空间的有效带宽，并且因此可以允许更多的设备同时共享相同的信道空间。

19. 发明申请

US20150163007A1 METHOD FOR DETERMINING IMPULSIVE INTERFERENCE APPLICABLE TO ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SIGNAL RECEIVER AND RECEIVER THEREOF 有权
标题翻译：用于确定适用于正交频分多址接入信号接收机及其接收机的脉冲干扰的方法
公开(公告)号：US20150163007A1
公开(公告)日：2015-06-11
申请号：US14562827
申请日：2014-12-08
申请人： MStar Semiconductor, Inc.
发明人： Fong-Shih Wei , Ko-Yin Lai , Chen-Yi Liu , Tai-Lai Tung
IPC分类号： H04J11/00 , H04L25/03
CPC分类号： H04J11/0023 , H04L25/03821 , H04L2025/03414
摘要： A method for determining impulsive interference applicable to an orthogonal frequency division multiple access (OFDMA) signal receiver is provided. The receiving method includes calculating a subcarrier noise of a first symbol, calculating a subcarrier noise of a second symbol, calculating a first ratio of the subcarrier noise of the first symbol to the subcarrier noise of the second symbol, determining whether the ratio is greater than a first threshold, and recognizing that the first symbol suffers from impulsive interference when the first ratio is greater than the first threshold.
摘要翻译：提供了一种用于确定适用于正交频分多址（OFDMA）信号接收机的脉冲干扰的方法。接收方法包括计算第一符号的副载波噪声，计算第二符号的副载波噪声，计算第一符号的副载波噪声与第二符号的副载波噪声的第一比值，确定该比率是否大于第一阈值，并且当第一比率大于第一阈值时，识别出第一符号遭受脉冲干扰。

20. 发明授权

US08948321B2 Reduced state sequence estimation with soft decision outputs 有权
标题翻译：通过软判决输出降低状态序列估计
公开(公告)号：US08948321B2
公开(公告)日：2015-02-03
申请号：US14187436
申请日：2014-02-24
申请人： MagnaCom Ltd.
发明人： Amir Eliaz , Ilan Reuven
IPC分类号： H03D1/00 , H04L27/06 , H04L1/00 , H04L25/03 , H04L27/26 , H04L25/02
CPC分类号： H04L27/2628 , H04L1/0054 , H04L25/02 , H04L25/03038 , H04L25/03159 , H04L25/03197 , H04L25/03821 , H04L25/497 , H04L27/2647 , H04L27/3405 , H04L2025/03414 , H04L2025/0342 , H04L2025/03522
摘要： A receiver may be operable to receive an inter-symbol correlated (ISC) signal, and generate a plurality of soft decisions as to information carried in the ISC signal. The soft decisions may be generated using a reduced-state sequence estimation (RSSE) process. The RSSE process may be such that the number of symbol survivors retained after each iteration of the RSSE process is less than the maximum likelihood state space. The plurality of soft decisions may comprise a plurality of log likelihood ratios (LLRs). Each of the plurality of LLRs may correspond to a respective one of a plurality of subwords of a forward error correction (FEC) codeword.
摘要翻译：接收机可以用于接收符号间相关（ISC）信号，并且生成关于在ISC信号中携带的信息的多个软判决。可以使用缩减状态序列估计（RSSE）过程来产生软判决。 RSSE过程可以使得在RSSE过程的每次迭代之后保留的符号幸存者的数量小于最大似然状态空间。多个软判决可以包括多个对数似然比（LLR）。多个LLR中的每一个可以对应于前向纠错（FEC）码字的多个子词中的相应一个。

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