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公开(公告)号：US20190245617A1
公开(公告)日：2019-08-08
申请号：US16387209
申请日：2019-04-17
申请人： INPHI CORPORATION
IPC分类号： H04B10/079 , H04B10/2507 , H04L25/03 , H04B10/61 , H04L27/01 , H04B10/07 , H04L5/00
CPC分类号： H04B10/0795 , H04B10/07 , H04B10/25073 , H04B10/614 , H04B10/616 , H04L5/0053 , H04L7/0058 , H04L25/03 , H04L25/03019 , H04L25/03292 , H04L25/03878 , H04L27/01
摘要： A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.
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公开(公告)号：US09923739B2
公开(公告)日：2018-03-20
申请号：US15375970
申请日：2016-12-12
发明人： Sayak Bose , Brandon Hombs , Joseph Farkas
IPC分类号： H04L25/03 , H04B7/0452
CPC分类号： H04L25/03292 , H04B7/0452 , H04L25/0204 , H04L25/03076 , H04L25/03267 , H04L25/03331 , H04L2025/03636
摘要： An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.
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公开(公告)号：US20170223733A1
公开(公告)日：2017-08-03
申请号：US15419839
申请日：2017-01-30
申请人： DENSO CORPORATION
发明人： Tsuneo Nakata
CPC分类号： H04W4/029 , H04L25/03292 , H04W4/046 , H04W28/26 , H04W72/048
摘要： In a mobile communication system, a mobile communication apparatus in a vehicle includes a selected resource antenna permitting communication using a selected resource, establishing wireless communication with a target communication apparatus. The mobile communication system includes a propagation path characteristic acquirer section and a resource selector section. The propagation path characteristics acquirer section acquires propagation path characteristics information in association with a future communication position, the propagation path characteristics information being about propagation path characteristics between (i) the target communication apparatus and (ii) a reference antenna equal to the selected resource antenna in antenna characteristics including an antenna format. The resource selector section, based on the propagation path characteristics information, selects a resource to be used in communication at the future communication position before the selected resource antenna of the mobile communication apparatus comes to be placed at the future communication position.
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公开(公告)号：US20170077972A1
公开(公告)日：2017-03-16
申请号：US15197794
申请日：2016-06-30
发明人： Zhen LU
CPC分类号： H04B1/1027 , H04B7/005 , H04L25/0202 , H04L25/03292 , H04L25/085 , H04L27/2601 , H04L27/2647 , H04L2025/03414
摘要： An interference processing method comprises: receiving a multi-carrier modulated signal, wherein the multi-carrier modulated signal comprises multi-carrier modulation symbols; discomposing the multi-carrier modulation symbols into a set of subcarriers, wherein the set of subcarriers at least comprises a target subcarrier; equalizing the target subcarrier to obtain an equalized target subcarrier; obtaining an error power of the equalized target subcarrier; and comparing the error power of the equalized target subcarrier with a predefined threshold to determine the existence of interference in the target subcarrier, wherein the predefined threshold is associated with a minimum distance between two constellation points of a modulation constellation of the target subcarrier.
摘要翻译： 干扰处理方法包括：接收多载波调制信号，其中所述多载波调制信号包括多载波调制符号; 将所述多载波调制符号分解成一组子载波，其中所述子载波集合至少包括目标子载波; 均衡目标子载波以获得均衡的目标子载波; 获得均衡的目标子载波的误差功率; 以及将所述均衡的目标子载波的误差功率与预定阈值进行比较，以确定所述目标子载波中的干扰的存在，其中所述预定阈值与所述目标子载波的调制星座图的两个星座点之间的最小距离相关联。
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5.发明申请APPARATUS AND METHODS FOR JOINT CHANNEL ESTIMATION AND NON-LINEAR SYMBOL DETECTION IN TD-SCDMA 审中-公开TD-SCDMA联合通道估计和非线性符号检测的装置与方法公开(公告)号：US20160014726A1
公开(公告)日：2016-01-14
申请号：US14327261
申请日：2014-07-09
发明人： Farrokh ABRISHAMKAR , Sheng-Yuan TU , Insung KANG , Bahadir CANPOLAT , Lan LAN , Chien Chung LIN
CPC分类号： H04W72/042 , H04L5/003 , H04L25/0204 , H04L25/0236 , H04L25/03171 , H04L25/03292 , H04W72/0446
摘要： Apparatus and methods for wireless communication include receiving, in a time division synchronous code division multiple access (TD-SCDMA) network, a first number of symbols before a midamble, the midamble, and a second number of symbols after the midamble; determining first forward and backward probabilities for a first subset of the first number of symbols and second forward and backward probabilities for a second subset of the second number of symbols; determining first posterior probabilities for the first subset of the first number of symbols and second posterior probabilities for the second subset of the second number of symbols; determining a first target posterior probability and a second target posterior probability; detecting a first target symbol and a second target symbol; and determining a first channel estimate corresponding to the first target symbol and a second channel estimate corresponding to the second target symbol.
摘要翻译： 用于无线通信的装置和方法包括：在时分同步码分多址（TD-SCDMA）网络中接收中间码之前的第一数量符号，中间码和中间码之后的第二数量的符号; 确定所述第一数量符号的第一子集的第一前向和后向概率以及所述第二数量符号的第二子集的第二前向和后向概率; 确定第一数量符号的第一子集的第一后验概率和第二数量符号的第二子集的第二后验概率; 确定第一目标后验概率和第二目标后验概率; 检测第一目标符号和第二目标符号; 以及确定对应于所述第一目标符号的第一信道估计和对应于所述第二目标符号的第二信道估计。
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6.发明申请公开(公告)号：US20150244456A1
公开(公告)日：2015-08-27
申请号：US14431032
申请日：2013-10-08
申请人： ALCATEL LUCENT
IPC分类号： H04B10/079 , H04B10/60
CPC分类号： H04B10/6162 , H04B10/0795 , H04L25/0202 , H04L25/0238 , H04L25/03292 , H04L25/067
摘要： An apparatus, a method and a computer program for determining estimates is disclosed. The apparatus determines estimates for transmitted symbols from received symbols of an optical signal affected by cross-Polarization Modulation (XpolM). The apparatus groups two or more subsequent received symbols from the optical signal into a group of received symbols and estimates an optical channel based on the group of received symbols and a hypothesis on the transmitted symbols. The apparatus further determines a reliability measure for a combination of the group of received symbols, the channel estimate, and the hypothesis, and determines the estimates for the transmitted symbols based on reliability measures for multiple hypotheses on the transmitted symbols.
摘要翻译： 公开了一种用于确定估计的装置，方法和计算机程序。 该装置确定受交叉极化调制（XpolM）影响的光信号的接收符号的传输符号的估计。 该装置将来自光信号的两个或更多个后续接收符号组合成一组接收的符号，并且基于所接收的符号组和所发送的符号上的假设来估计光信道。 该装置进一步确定接收符号组，信道估计和假设的组合的可靠性度量，并且基于对所发射符号上的多个假设的可靠性度量来确定所发射符号的估计。
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公开(公告)号：US09094117B1
公开(公告)日：2015-07-28
申请号：US13744211
申请日：2013-01-17
CPC分类号： H04B10/0795 , H04B10/07 , H04B10/25073 , H04B10/614 , H04B10/616 , H04L7/0058 , H04L25/03 , H04L25/03019 , H04L25/03292 , H04L25/03878 , H04L27/01
摘要： A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.
摘要翻译： 接收机应用校准方法来补偿输入通道之间的偏斜。 通过观察基于多通道输入信号的时变特性来调整系数的自适应均衡器的系数来估计接收器偏移。 通过对不同通道的采样时钟的相位进行编程来补偿接收器偏移。 此外，在接收机的实时操作期间，执行信道诊断以使用频率平均或极化平均方法基于均衡器系数自动估计差分组延迟和/或其他信道特性。 还可以使用成帧器信息来估计作为符号率的整数倍的差分组延迟。 另外，当基于信道诊断信息检测到实质的信号劣化时，可以执行DSP复位。
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8.发明授权公开(公告)号：US09048917B1
公开(公告)日：2015-06-02
申请号：US13959498
申请日：2013-08-05
IPC分类号： H04B1/10 , H04L25/02 , H04L5/00 , H04L25/03 , H04L1/02 , H04L1/06 , H04B7/02 , H04B7/04 , H04W52/24
CPC分类号： H04B17/345 , H04B1/1027 , H04B7/024 , H04B7/04 , H04B7/0413 , H04L1/02 , H04L1/0631 , H04L5/0023 , H04L25/0204 , H04L25/0206 , H04L25/021 , H04L25/024 , H04L25/0242 , H04L25/0248 , H04L25/0328 , H04L25/03292 , H04L25/03891 , H04L25/03993 , H04W52/24
摘要： The present disclosure includes systems and techniques relating to processing received spatially diverse transmissions. In some implementations, an apparatus includes: circuitry configured to receive signals from separate communication inputs; circuitry configured to filter the signals to reduce noise, interference, or both; circuitry configured to estimate covariance of the separate communication inputs, including estimating a correlation between the separate communication inputs; and circuitry configured to apply the covariance estimation to the filtering circuitry to effect noise whitening and to force an underestimation of the correlation between the separate communication inputs as applied.
摘要翻译： 本公开包括与处理接收到的空间不同的传输有关的系统和技术。 在一些实施方式中，一种装置包括：被配置为从单独的通信输入接收信号的电路; 被配置为过滤信号以减少噪声，干扰或两者的电路; 被配置为估计所述单独通信输入的协方差的电路，包括估计所述单独的通信输入之间的相关性; 以及电路，被配置为将所述协方差估计应用于所述滤波电路以实现噪声白化，并且强制低估所应用的分离的通信输入之间的相关性。
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公开(公告)号：US09048893B1
公开(公告)日：2015-06-02
申请号：US14028088
申请日：2013-09-16
发明人： Yakun Sun , Mingguang Xu , Jie Huang
CPC分类号： H04B7/0417 , H04B7/0413 , H04B7/0626 , H04L1/0054 , H04L25/03267 , H04L25/03292 , H04L25/03968
摘要： In various embodiments, the present disclosure provides transmitters, receivers, and methods of determining channel state information for a maximum likelihood (ML) multiple input multiple output (MIMO) receiver, as well as transmitting and demodulating signals based on the determined channel state information. A ML MIMO receiver receives a first MIMO signal from a MIMO transmitter. Channel characteristics of the first MIMO signal are determined based on decision feedback equalization (DFE) processing. The DFE-determined channel characteristics, or information derived from the DFE-determined channel characteristics, are reported to the MIMO transmitter and the MIMO ML receiver decodes a second MIMO signal based on ML processing. The second MIMO signal is modulated and encoded by the MIMO transmitter according to a modulation and coding scheme in accordance with (1) the DFE-determined channel characteristics or (2) the information derived from the DFE-determined channel characteristics.
摘要翻译： 在各种实施例中，本公开提供了确定用于最大似然（ML）多输入多输出（MIMO）接收机的信道状态信息的发射机，接收机和方法，以及基于所确定的信道状态信息来发射和解调信号。 ML MIMO接收机从MIMO发射机接收第一MIMO信号。 基于判决反馈均衡（DFE）处理确定第一MIMO信号的信道特性。 将DFE确定的信道特性或从DFE确定的信道特性导出的信息报告给MIMO发射机，并且MIMO ML接收机基于ML处理来解码第二MIMO信号。 根据（1）DFE确定的信道特性的调制和编码方案，由MIMO发射机调制和编码第二MIMO信号，或（2）从DFE确定的信道特性导出的信息。
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10.发明申请公开(公告)号：US20140226764A1
公开(公告)日：2014-08-14
申请号：US13762387
申请日：2013-02-08
申请人： MEDIATEK INC.
发明人： Wei-Jen Chen , Chia-Yu Chang , Po-Ying Chen
IPC分类号： H04B1/10
CPC分类号： H04B1/1081 , H04J11/0063 , H04L25/0224 , H04L25/03171 , H04L25/03178 , H04L25/03292 , H04L25/03318
摘要： A method for performing wireless communications and an associated apparatus are provided, where the method is applied to an electronic device. The method includes the steps of: receiving at least one data stream, wherein each data stream from the at least one data stream is transmitted from a wireless channel; in a first iteration, utilizing a Maximum Likelihood (ML) estimator to perform demapping processing on at least one portion of the at least one data stream to obtain Log-Likelihood Ratios (LLRs) of the first iteration and performing Turbo decoding according to the LLRs of the first iteration to generate resultant LLRs of the first Iteration; and in at least one following iteration, utilizing a Max A Posterior (MAP) estimator to perform demapping processing on at least one portion of the at least one data stream and performing Turbo decoding, successively, in order to cancel interference due to the wireless channel.
摘要翻译： 提供了一种用于执行无线通信的方法和相关联的设备，其中该方法被应用于电子设备。 该方法包括以下步骤：接收至少一个数据流，其中从无线信道发送来自所述至少一个数据流的每个数据流; 在第一迭代中，利用最大似然（ML）估计器对至少一个数据流的至少一部分执行解映射处理，以获得第一迭代的对数似然比（LLR），并根据LLR进行Turbo解码 的第一次迭代以产生第一迭代的合成LLR; 并且在至少一个后续迭代中，利用最大后验（MAP）估计器对所述至少一个数据流的至少一部分执行解映射处理并且连续执行Turbo解码，以便消除由于所述无线信道造成的干扰 。
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