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1. 发明申请

WO2011141836A1 EXPLOITING CHANNEL TIME CORRELATION TO REDUCE CHANNEL STATE INFORMATION FEEDBACK BITRATE 审中-公开
标题翻译：消除通道时间关联以减少通道状态信息反馈双向
公开(公告)号：WO2011141836A1
公开(公告)日：2011-11-17
申请号：PCT/IB2011/051758
申请日：2011-04-21
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , CHENG, Jung-Fu , HUI, Dennis , ZANGI, Kambiz , KRASNY, Leonid
发明人： CHENG, Jung-Fu , HUI, Dennis , ZANGI, Kambiz , KRASNY, Leonid
IPC分类号： H04L1/00 , H04B7/06 , H04L1/20 , H04B7/04 , H04B17/00
CPC分类号： H04W72/0413 , H04L1/0019 , H04L1/0028 , H04L1/20 , H04W72/042
摘要： The required bitrate for reporting channel state information from a network transceiver to the network is dramatically reduced, while maintaining fidelity of channel estimates, by exploiting prior channel estimates and the time correlation of channel response. For a selected set of sub-carriers, the transceiver estimates channel frequency response from pilot signals. The transceiver also predicts the frequency response for each selected sub-carrier, by multiplying a state vector comprising prior frequency response estimate and a coefficient vector comprising linear predictive coefficients. The predicted frequency response is subtracted from the estimated frequency response, and the prediction error is quantized and transmitted to the network. The network maintains a corresponding state vector and predictive coefficient vector, and also predicts a frequency response for each selected sub-carrier. The received prediction error is inverse quantized and subtracted from the predicted frequency response to yield a frequency response corresponding to that estimated at the transceiver.
摘要翻译：通过利用先前的信道估计和信道响应的时间相关性，可以显着降低从网络收发器向网络报告信道状态信息所需的比特率，同时保持信道估计的保真度。对于所选择的一组子载波，收发器估计来自导频信号的信道频率响应。收发器还通过将包括先前频率响应估计的状态向量和包括线性预测系数的系数向量相乘来预测每个所选子载波的频率响应。从估计的频率响应中减去预测的频率响应，并将预测误差量化并发送到网络。网络维持相应的状态向量和预测系数向量，并且还预测每个选择的子载波的频率响应。接收的预测误差被反量化，并从预测的频率响应中减去，以产生与在收发机处估计的频率响应相对应的频率响应。

2. 发明申请

WO2010122536A2 CHANNEL STATE INFORMATION RECONSTRUCTION FROM SPARSE DATA 审中-公开
标题翻译：频道数据重新进行信道重建
公开(公告)号：WO2010122536A2
公开(公告)日：2010-10-28
申请号：PCT/IB2010/051808
申请日：2010-04-23
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , CHENG, Jung-Fu , ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
发明人： CHENG, Jung-Fu , ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
IPC分类号： H04L1/00
CPC分类号： H04B17/0047 , H04B7/024 , H04B7/0626 , H04B7/0639 , H04B17/336 , H04B17/364 , H04L1/0003 , H04L1/0009 , H04L1/0019 , H04L1/0026 , H04L1/20 , H04L25/0212 , H04L25/022 , H04L25/0224
摘要： Accurate downlink channe! estimates are catenated based on infrequently transmitted Channel State information (CS!) feedback data from a UE 20. A plurality of non-uniformly spaced digital CSI feedback samples, representing the frequency response of a downlink communication channel, is received from the UE, The received CS! feedback samples are demodulated and inverse quantized. A time domain tap deiay channel model is generated from the inverse quantized CSI feedback samples. The time domain tap delay channe! model may be frequency-transformed to obtain a reconstructed frequency response of the downlink communication channel in the frequency domain. Alternatively, channel delays may be estimated based on prior delays and/or known references signals transmitted on the uplink. Channel estimates between CS! reporting instances may be predicted, such as by a sample & hold or a linear predictor. The delays may be presumed fixed, and Kalman filter coefficients evolved over time.
摘要翻译：准确的下行通道！基于来自UE20的不常发送的信道状态信息（CS！）反馈数据来估计估计值。从UE接收表示下行链路通信信道的频率响应的多个非均匀间隔的数字CSI反馈样本。收到CS！反馈样本被解调和反量化。从逆量化的CSI反馈样本中产生时域抽头信道模型。时域点击延时通道！模型可以被频率变换以获得频域中的下行链路通信信道的重构频率响应。或者，可以基于在上行链路上发送的先前的延迟和/或已知的参考信号来估计信道延迟。频道估计CS！可以预测报告实例，例如通过采样和保持或线性预测器。可以推测延迟是固定的，并且卡尔曼滤波器系数随时间演化。

3. 发明申请

WO2010122535A2 EFFICIENT UPLINK TRANSMISSION OF CHANNEL STATE INFORMATION 审中-公开
标题翻译：高效率上行链路传输信道状态信息
公开(公告)号：WO2010122535A2
公开(公告)日：2010-10-28
申请号：PCT/IB2010/051807
申请日：2010-04-23
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , CHENG, Jung-Fu , ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
发明人： CHENG, Jung-Fu , ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
IPC分类号： H04L1/00
CPC分类号： H04B17/0047 , H04B7/024 , H04B7/0626 , H04B7/0639 , H04B17/336 , H04B17/364 , H04L1/0003 , H04L1/0009 , H04L1/0019 , H04L1/0026 , H04L1/20 , H04L25/0212 , H04L25/022 , H04L25/0224
摘要： A UE in a wireless communication network transmits succinct, direct channel state information to the network, enabling coordinated multipoint calculations such as joint processing, without substantially increasing uplink overhead. The UE receives and processes reference symbols over a set of non-uniform!y spaced sub-carriers, selected according to a scheme synchronized to the network. The frequency response for each selected sub- carrier is estimated conventionally, and the results quantized and transmitted to the network on an uplink control channel. The non-uniform sub-carrier selection may be synchronized to the network in a variety of ways.
摘要翻译：无线通信网络中的UE向网络发送简洁的直接信道状态信息，实现诸如联合处理之类的协作多点计算，而基本上不增加上行链路开销。 UE根据与网络同步的方案选择的一组不均匀的间隔子载波上接收和处理参考符号。常规地估计每个所选子载波的频率响应，并且在上行链路控制信道上量化并发送到网络的结果。非均匀子载波选择可以以各种方式与网络同步。

4. 发明申请

WO2012063173A1 RECEIVER AND METHOD FOR REDUCING AN AMOUNT OF CHANNEL STATE INFORMATION FEEDBACK TO A TRANSMITTER 审中-公开
标题翻译：一种用于减少信道状态信息反馈到发射机的接收机和方法
公开(公告)号：WO2012063173A1
公开(公告)日：2012-05-18
申请号：PCT/IB2011/054906
申请日：2011-11-03
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , HUI, Dennis , CHENG, Jung-Fu , ZANGI, Kambiz , KRASNY, Leonid
发明人： HUI, Dennis , CHENG, Jung-Fu , ZANGI, Kambiz , KRASNY, Leonid
IPC分类号： H04B7/04 , H04B7/06
CPC分类号： H04B7/0417 , H04B7/065 , H04B7/0658 , H04B7/066 , H04B7/0663
摘要： A receiver and a method are described herein for reducing an amount of channel state information related to a transmit channel correlation matrix Φ τχ that is feedback to a transmitter. In addition, to a transmitter and a method are described herein for reconstructing the transmit channel correlation matrix Φ τχ using the reduced channel state feedback information received from the receiver.
摘要翻译：本文描述了一种接收机和方法，用于减少与发射信道相关矩阵Ft？相关的信道状态信息量。这是对发射机的反馈。此外，在这里描述了一种发射机和方法，用于重建发射信道相关矩阵Ft？使用从接收机接收的减少的信道状态反馈信息。

5. 发明申请

WO2010106416A1 SYSTEMS AND METHOD FOR COORDINATED MULTIPOINT DOWNLINK TRANSMISSIONS 审中-公开
标题翻译：用于协调多点下行链路传输的系统和方法
公开(公告)号：WO2010106416A1
公开(公告)日：2010-09-23
申请号：PCT/IB2010/000544
申请日：2010-03-15
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
发明人： ZANGI, Kambiz , HUI, Dennis , KRASNY, Leonid
IPC分类号： H04B7/02 , H04L25/02
CPC分类号： H04B7/024
摘要： A method for determining antenna weights for use in transmitting data from a plurality of base stations to a user device is disclosed. The antenna weights are determined using an input covariance matrix (S), and the input covariance matrix is determined subject to a predetermined power constraint and a predetermined, non-zero interference constraint.
摘要翻译：公开了一种用于确定用于从多个基站向用户设备发送数据的天线权重的方法。使用输入协方差矩阵（S）确定天线权重，并且在预定功率约束和预定的非零干扰约束条件下确定输入协方差矩阵。

6. 发明申请

WO2010150198A2 METHOD AND APPARATUS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS 审中-公开
标题翻译：无线通信系统中增强信道估计的方法与装置
公开(公告)号：WO2010150198A2
公开(公告)日：2010-12-29
申请号：PCT/IB2010/052835
申请日：2010-06-22
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , KRASNY, Leonid , GUEY, Jiann-Ching
发明人： KRASNY, Leonid , GUEY, Jiann-Ching
IPC分类号： H04L25/02
CPC分类号： H04L25/0232 , H04L5/0007 , H04L5/0048 , H04L25/0218 , H04L25/022 , H04L25/024
摘要： A method and apparatus for channel estimation based on extracting channel information, including noise spectral density, from a received signal, and advantageously exploiting that information for improved channel estimation accuracy One embodiment is directed to a method of generating channel estimates in a wireless communication receiver, for processing a received communication signal The method includes generating first channel estimates from a set of pilot observations obtained from the received communication signal, using a first channel estimation process that is not dependent on knowledge of channel statistics. The method further includes estimating channel statistics and a noise variance from the first channel estimates, and generating second channel estimates from the set of pilot observations, the estimated channel statistics, and the estimated noise variance, using a second channel estimation process that is dependent on knowledge of the channel statistics
摘要翻译：一种用于信道估计的方法和装置，其基于从接收信号中提取包括噪声频谱密度的信道信息，并且有利地利用该信息以改善信道估计精度。一个实施例涉及一种在无线通信接收机中产生信道估计的方法，用于处理接收到的通信信号。该方法包括使用不依赖于信道统计知识的第一信道估计过程从从所接收的通信信号获得的一组导频观测中产生第一信道估计。该方法还包括从第一信道估计估计信道统计和噪声方差，以及使用依赖于第二信道估计过程的第二信道估计过程从所述导频观测集合，所估计的信道统计信息和估计的噪声方差产生第二信道估计渠道统计知识

7. 发明申请

WO2010140101A1 IMPROVED MOBILE RADIO CHANNEL ESTIMATION 审中-公开
标题翻译：改进的移动无线电信道估计
公开(公告)号：WO2010140101A1
公开(公告)日：2010-12-09
申请号：PCT/IB2010/052401
申请日：2010-05-28
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , DENT, Paul, W. , KRASNY, Leonid
发明人： DENT, Paul, W. , KRASNY, Leonid
IPC分类号： H04L25/02
CPC分类号： H04L25/0202
摘要： The method described herein characterizes scattering objects in a wireless channel. Broadly, the present invention determines non-equalϊy spaced path delays and Doppler parameters for a plurality of scattering objects in a wireless channel. More particularly, a frequency-to-time transform applied to a plurality of OFDM pilot samples received over a plurality of OFDM symbol periods generates a set of non-equally spaced path delays and a set of associated complex delay coefficients. Further, a time-to- frequency transform applied to the complex delay coefficients determined for one path delay over multiple OFDM symbol periods generates a set of Doppler parameters comprising a plurality of non-equally spaced Doppler frequencies and their corresponding scattering coefficients for that path delay.
摘要翻译：本文描述的方法表征无线信道中的散射物体。广义上，本发明确定无线信道中多个散射物体的不相等的间隔路径延迟和多普勒参数。更具体地，应用于在多个OFDM符号周期中接收的多个OFDM导频样本的频率 - 时间变换产生一组不等间距的路径延迟和一组相关联的复延迟系数。此外，应用于针对多个OFDM符号周期上的一个路径延迟确定的复延迟系数的时间 - 频率变换产生一组多普勒参数，其包括多个非等距多普勒频率及其对于该路径延迟的相应散射系数。

8. 发明申请

WO2011080644A3 RADIO CHANNEL ANALYZER TO DETERMINE DOPPLER SHIFTS ACROSS MULTIPLE FREQUENCIES OF A WIDEBAND SIGNAL 审中-公开
公开(公告)号：WO2011080644A3
公开(公告)日：2011-07-07
申请号：PCT/IB2010/055851
申请日：2010-12-15
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , DENT, Paul, W. , KRASNY, Leonid
发明人： DENT, Paul, W. , KRASNY, Leonid
IPC分类号： H04L25/02
摘要： A receiver and receive processing method described herein improves the accuracy of channel estimates by correcting for the assumption that the Doppler shift (or rate-of-change-of-delay) stays constant for each frequency within a signal bandwidth of a received signal. To that end, a receiver according to the present invention comprises a channel processor having multiple processing units. A first processing unit processes reference values (e.g., pilot signals) received for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times (or the complex propagation channel coefficients estimated therefrom) to determine a set of complex wave amplitudes either for each of multiple frequencies in the signal bandwidth or for each of the different signal times. A second processing unit subsequently processes the complex wave amplitudes to determine complex scattering coefficients, where each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel.

9. 发明申请

WO2010140131A3 CONTINUOUS SEQUENTIAL SCATTERER ESTIMATION 审中-公开
公开(公告)号：WO2010140131A3
公开(公告)日：2010-12-09
申请号：PCT/IB2010/052470
申请日：2010-06-02
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , DENT, Paul W. , KRASNY, Leonid
发明人： DENT, Paul W. , KRASNY, Leonid
IPC分类号： H04L25/02
摘要： The present invention uses newly received signal samples to update previously determined scatterer parameters, and therefore, reduces the processing effort required for characterizing scattering objects in a wireless channel. Broadly, the present invention determines a first set of scatterer parameters based on signal samples derived from signals received during one or more previous time interval, and determines an updated set of scatterer parameters for a subsequent time interval based on the first set of scatterer parameters and the new signal samples hi one exemplary embodiment, the receiver uses a continuous sequential update process, e.g., a per-symbol-period inverse Prony process, to update the scatters parameters !n another exemplar embodiment, the receiver uses an integrated Doppler approach to update the scatterer parameters.

10. 发明申请

WO2006029789A1 METHOD AND APPARATUS FOR SUPPRESSING COMMUNICATION SIGNAL INTERFERENCE 审中-公开
标题翻译：用于抑制通信信号干扰的方法和装置
公开(公告)号：WO2006029789A1
公开(公告)日：2006-03-23
申请号：PCT/EP2005/009778
申请日：2005-09-12
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (publ) , CAIRNS, Douglas , KRASNY, Leonid
发明人： CAIRNS, Douglas , KRASNY, Leonid
IPC分类号： H04B1/707
CPC分类号： H04L25/03006
摘要： A frequency domain representation of a whitening filter is made to depend on essentially one unknown, namely, a scaling factor that is based on an estimated ratio of total base station power to the power spectral density (PSD) of inter-cell interference plus noise. In turn, that scaling factor can be computed based on the modeling terms used in a parametric model of the impairment correlations for a received communication signal. Preferably, the model comprises an interference impairment term scaled by a first model fitting parameter, and a noise impairment term scaled by a second model fitting parameter. Further, the scaling factor can be computed by directly estimating total base station transmit power and the PSD of inter-cell interference plus noise. In any case, the whitening filter can be used in whitening a received communication signal in conjunction with channel equalization processing or RAKE receiver processing, for example.
摘要翻译：使白化滤波器的频域表示基本上取决于一个未知数，即基于总基站功率与小区间干扰加噪声的功率谱密度（PSD）的估计比的缩放因子。反过来，可以基于在接收到的通信信号的损害相关的参数模型中使用的建模项来计算该缩放因子。优选地，该模型包括由第一模型拟合参数缩放的干扰损害项和由第二模型拟合参数缩放的噪声损伤项。此外，可以通过直接估计总基站发射功率和小区间干扰加上噪声的PSD来计算缩放因子。在任何情况下，例如，白化滤波器可以用于结合信道均衡处理或RAKE接收机处理来使接收到的通信信号变白。

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