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1. 发明授权

US08406326B2 Exploiting channel time correlation to reduce channel state information feedback bitrate 有权
标题翻译：利用信道时间相关来减少信道状态信息反馈比特率
公开(公告)号：US08406326B2
公开(公告)日：2013-03-26
申请号：US12779106
申请日：2010-05-13
申请人： Jung-Fu Cheng , Dennis Hui , Kambiz Zangi , Leonid Krasny
发明人： Jung-Fu Cheng , Dennis Hui , Kambiz Zangi , Leonid Krasny
IPC分类号： H04K1/10
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

US20100271931A1 CHANNEL STATE INFORMATION RECONSTRUCTION FROM SPARSE DATA 有权
标题翻译：频道数据重新进行信道重建
公开(公告)号：US20100271931A1
公开(公告)日：2010-10-28
申请号：US12555973
申请日：2009-09-09
申请人： Jung-Fu Cheng , Kambiz Zangi , Dennis Hui , Leonid Krasny
发明人： Jung-Fu Cheng , Kambiz Zangi , Dennis Hui , Leonid Krasny
IPC分类号： H04J11/00 , H04B17/00
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 channel estimates are calculated based on infrequently transmitted Channel State Information (CSI) 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 CSI feedback samples are demodulated and inverse quantized. A time domain tap delay channel model is generated from the inverse quantized CSI feedback samples. The time domain tap delay channel 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 CSI 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：基于来自UE20的不频繁发送的信道状态信息（CSI）反馈数据来计算准确的下行链路信道估计。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。接收的CSI反馈样本被解调和反量化。时域抽头延迟信道模型是从逆向量化的CSI反馈样本生成的。时域抽头延迟信道模型可以被频率变换以获得频域中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。可以预测CSI报告实例之间的信道估计，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. 发明授权

US08923110B2 Channel state information reconstruction from sparse data 有权
标题翻译：从稀疏数据重建信道状态信息
公开(公告)号：US08923110B2
公开(公告)日：2014-12-30
申请号：US12555973
申请日：2009-09-09
申请人： Jung-Fu Cheng , Kambiz Zangi , Dennis Hui , Leonid Krasny
发明人： Jung-Fu Cheng , Kambiz Zangi , Dennis Hui , Leonid Krasny
IPC分类号： H04J11/00 , H04B7/02 , H04B17/00 , H04L1/20 , H04L25/02 , H04L1/00 , H04B7/06
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 channel estimates are calculated based on infrequently transmitted Channel State Information (CSI) 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 CSI feedback samples are demodulated and inverse quantized. A time domain tap delay channel model is generated from the inverse quantized CSI feedback samples. The time domain tap delay channel 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 CSI 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：基于来自UE20的不频繁发送的信道状态信息（CSI）反馈数据来计算准确的下行链路信道估计。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。接收的CSI反馈样本被解调和反量化。时域抽头延迟信道模型是从逆向量化的CSI反馈样本生成的。时域抽头延迟信道模型可以被频率变换以获得频域中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。可以预测CSI报告实例之间的信道估计，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。

4. 发明授权

US08219128B2 Network-centric link adaptation for coordinated multipoint downlink transmission 有权
标题翻译：用于协调多点下行链路传输的以网络为中心的链路自适应
公开(公告)号：US08219128B2
公开(公告)日：2012-07-10
申请号：US12483603
申请日：2009-06-12
申请人： Kambiz Zangi , Abdulrauf Hafeez , Dennis Hui
发明人： Kambiz Zangi , Abdulrauf Hafeez , Dennis Hui
IPC分类号： H04B15/00 , H04B17/00 , H04B7/185
CPC分类号： H04L1/0001 , H04J11/0053 , H04L1/0022 , H04L1/0034 , H04L5/0035
摘要： A Coordinated MultiPoint (CoMP) cell controller performs network-centric link adaptation for User Equipment (UE) in the CoMP cell. The CoMP cell controller receives at least infrequent channel estimates from a UE in the CoMP cell, from which it estimates downlink channel and thermal noise at the UE. The CoMP cell controller is aware of the desired signal to be received at the UE, and the intra-CoMP cell interference to the UE caused by transmissions to other UEs in the CoMP cell. The CoMP cell receives from the UE reports of inter-CoMP cell interference caused by transmissions by other CoMP cells. Based on the downlink channel quality, the desired signal, the intra-CoMP cell interference, the inter-CoMP cell interference, and the thermal noise, the CoMP cell controller performs link adaptation by selecting modulation and coding schemes, and other transmission parameters, for an upcoming transmission duration (such as a TTI).
摘要翻译：协调多点（CoMP）小区控制器在CoMP小区中为用户设备（UE）执行以网络为中心的链路自适应。 CoMP小区控制器从CoMP小区中的UE接收至少不频繁的信道估计，从UE估计UE处的下行链路信道和热噪声。 CoMP小区控制器知道将在UE处接收的期望信号，以及由CoMP小区中的其他UE的传输引起的对UE的CoMP小区干扰。 CoMP小区从UE接收由其他CoMP小区的传输引起的CoMP间干扰的干扰。基于下行链路信道质量，期望信号，CoMP间小区干扰，CoMP间干扰和热噪声，CoMP小区控制器通过选择调制和编码方案以及其他传输参数来执行链路自适应，用于即将到来的传输持续时间（如TTI）。

5. 发明授权

US08107965B2 Distributed computation of precoding weights for coordinated multipoint transmission on the downlink 有权
标题翻译：分布式计算下行链路上协调多点传输的预编码权重
公开(公告)号：US08107965B2
公开(公告)日：2012-01-31
申请号：US12547817
申请日：2009-08-26
申请人： Dennis Hui , Kambiz Zangi
发明人： Dennis Hui , Kambiz Zangi
IPC分类号： H04W52/30
CPC分类号： H04B7/024 , H04B7/0615 , H04W52/365
摘要： In a Coordinated Multi-point (CoMP) system, the base station (BS) in each serving cell (or sector) is allowed to use not only its own antennas, but also the antennas of neighboring BSs to transmit to mobile terminals in the serving cell to form a floating CoMP cell. The serving BS in each floating CoMP cell computes tentative linear precoding weights for transmissions from the coordinating BSs in the floating CoMP cell to users in the serving cell of the floating CoMP cell. The serving BS determines the power availability for transmit antennas in the floating CoMP cell that are shared with other floating CoMP cells, and scales the tentative precoding weights based on the power availability of the shared transmit antennas to determine final precoding weights so that the power constraints of the shared transmit antennas will not be violated.
摘要翻译：在协调多点（CoMP）系统中，每个服务小区（或扇区）中的基站（BS）被允许不仅使用其自己的天线，而且还使用相邻BS的天线来发送给服务中的移动终端细胞形成浮游CoMP细胞。每个浮动CoMP单元中的服务BS为浮动CoMP小区中的协调BS的传输计算用于在浮动CoMP小区的服务小区中的用户的临时线性预编码权重。服务BS确定与其他浮动CoMP小区共享的浮动CoMP小区中的发射天线的功率可用性，并且基于共享发射天线的功率可用性来缩放初步预编码权重，以确定最终预编码权重，使得功率约束的共享发射天线将不会被违反。

6. 发明申请

US20110280287A1 EXPLOITING CHANNEL TIME CORRELATION TO REDUCE CHANNEL STATE INFORMATION FEEDBACK BITRATE 有权
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：US20110280287A1
公开(公告)日：2011-11-17
申请号：US12779106
申请日：2010-05-13
申请人： Jung-Fu Cheng , Dennis Hui , Kambiz Zangi , Leonid Krasny
发明人： Jung-Fu Cheng , Dennis Hui , Kambiz Zangi , Leonid Krasny
IPC分类号： H04B1/38 , H04B7/02
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。

7. 发明申请

US20100317355A1 Network-Centric Link Adaptation for Coordinated Multipoint Downlink Transmission 有权
标题翻译：用于协调多点下行链路传输的以网络为中心的链路适配
公开(公告)号：US20100317355A1
公开(公告)日：2010-12-16
申请号：US12483603
申请日：2009-06-12
申请人： Kambiz Zangi , Abdulrauf Hafeez , Dennis Hui
发明人： Kambiz Zangi , Abdulrauf Hafeez , Dennis Hui
IPC分类号： H04B15/00 , H04W72/04
CPC分类号： H04L1/0001 , H04J11/0053 , H04L1/0022 , H04L1/0034 , H04L5/0035
摘要： A Coordinated MultiPoint (CoMP) cell controller performs network-centric link adaptation for User Equipment (UE) in the CoMP cell. The CoMP cell controller receives at least infrequent channel estimates from a UE in the CoMP cell, from which it estimates downlink channel and thermal noise at the UE. The CoMP cell controller is aware of the desired signal to be received at the UE, and the intra-CoMP cell interference to the UE caused by transmissions to other UEs in the CoMP cell. The CoMP cell receives from the UE reports of inter-CoMP cell interference caused by transmissions by other CoMP cells. Based on the downlink channel quality, the desired signal, the intra-CoMP cell interference, the inter-CoMP cell interference, and the thermal noise, the CoMP cell controller performs link adaptation by selecting modulation and coding schemes, and other transmission parameters, for an upcoming transmission duration (such as a TTI).
摘要翻译：协调多点（CoMP）小区控制器在CoMP小区中为用户设备（UE）执行以网络为中心的链路自适应。 CoMP小区控制器从CoMP小区中的UE接收至少不频繁的信道估计，从UE估计UE处的下行链路信道和热噪声。 CoMP小区控制器知道将在UE处接收的期望信号，以及由CoMP小区中的其他UE的传输引起的对UE的CoMP小区干扰。 CoMP小区从UE接收由其他CoMP小区的传输引起的CoMP间干扰的干扰。基于下行链路信道质量，期望信号，CoMP间小区干扰，CoMP间干扰和热噪声，CoMP小区控制器通过选择调制和编码方案以及其他传输参数来执行链路自适应，用于即将到来的传输持续时间（如TTI）。

8. 发明申请

US20100290382A1 DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK 有权
标题翻译：下行链路上协调多点传输的预编码权重分配计算
公开(公告)号：US20100290382A1
公开(公告)日：2010-11-18
申请号：US12547817
申请日：2009-08-26
申请人： Dennis Hui , Kambiz Zangi
发明人： Dennis Hui , Kambiz Zangi
IPC分类号： H04H20/71
CPC分类号： H04B7/024 , H04B7/0615 , H04W52/365
摘要： In a Coordinated Multi-point (CoMP) system, the base station (BS) in each serving cell (or sector) is allowed to use not only its own antennas, but also the antennas of neighboring BSs to transmit to mobile terminals in the serving cell to form a floating CoMP cell. The serving BS in each floating CoMP cell computes tentative linear precoding weights for transmissions from the coordinating BSs in the floating CoMP cell to users in the serving cell of the floating CoMP cell. The serving BS determines the power availability for transmit antennas in the floating CoMP cell that are shared with other floating CoMP cells, and scales the tentative precoding weights based on the power availability of the shared transmit antennas to determine final precoding weights so that the power constraints of the shared transmit antennas will not be violated.
摘要翻译：在协调多点（CoMP）系统中，每个服务小区（或扇区）中的基站（BS）被允许不仅使用其自己的天线，而且还使用相邻BS的天线来发送给服务中的移动终端细胞形成浮游CoMP细胞。每个浮动CoMP单元中的服务BS为浮动CoMP小区中的协调BS的传输计算用于在浮动CoMP小区的服务小区中的用户的临时线性预编码权重。服务BS确定与其他浮动CoMP小区共享的浮动CoMP小区中的发射天线的功率可用性，并且基于共享发射天线的功率可用性来缩放初步预编码权重，以确定最终预编码权重，使得功率约束的共享发射天线将不会被违反。

9. 发明申请

US20100234053A1 SYSTEMS AND METHOD FOR COORDINATED MULTIPOINT DOWNLINK TRANSMISSIONS 有权
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：US20100234053A1
公开(公告)日：2010-09-16
申请号：US12404773
申请日：2009-03-16
申请人： Kambiz Zangi , Dennis Hui , Leonid Krasny
发明人： Kambiz Zangi , Dennis Hui , Leonid Krasny
IPC分类号： H04B7/005 , H04B15/00
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。

10. 发明申请

US20100128683A1 ORTHOGONAL REFERENCE SIGNALS WITH DIFFERENT BANDWIDTH AND OVERLAPPING SPECTRUM 有权
标题翻译：具有不同带宽和重叠频谱的正交参考信号
公开(公告)号：US20100128683A1
公开(公告)日：2010-05-27
申请号：US12324073
申请日：2008-11-26
申请人： Kambiz Zangi , Erik Dahlman , Dennis Hui
发明人： Kambiz Zangi , Erik Dahlman , Dennis Hui
IPC分类号： H04J11/00 , H04W72/04
CPC分类号： H04L5/0051 , H04L5/0007 , H04L5/0062 , H04L25/0202
摘要： The present invention provides a method of generating mutually orthogonal reference signals for different user terminals in and OFDM system that span different but overlapping subcarriers. The subcarriers allocated to the user terminals are divided into a plurality of non-overlapping subcarrier blocks. Each user terminal is then allocated one or more subcarrier blocks. For each subcarrier block, a user terminal is assigned a reference signal comprising a base reference sequence and a linear phase rotation. To ensure mutual orthogonality among all user terminals, user terminals allocated the same subcarrier block use the same base reference sequence with different linear phase rotations.
摘要翻译：本发明提供了一种对跨越不同但重叠的子载波的不同用户终端和OFDM系统生成相互正交参考信号的方法。分配给用户终端的副载波被划分成多个不重叠的副载波块。然后，每个用户终端被分配一个或多个子载波块。对于每个子载波块，向用户终端分配包括基本参考序列和线性相位旋转的参考信号。为了确保所有用户终端之间的相互正交性，分配相同子载波块的用户终端使用具有不同线性相位旋转的相同的基准参考序列。

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