公开(公告)号：US08406326B2

公开(公告)日：2013-03-26

申请号：US12779106

申请日：2010-05-13

Applicant: Jung-Fu Cheng ,  Dennis Hui ,  Kambiz Zangi ,  Leonid Krasny

Inventor： Jung-Fu Cheng ,  Dennis Hui ,  Kambiz Zangi ,  Leonid Krasny

IPC: H04K1/10

CPC classification number: H04W72/0413 ,  H04L1/0019 ,  H04L1/0028 ,  H04L1/20 ,  H04W72/042

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100271931A1

公开(公告)日：2010-10-28

申请号：US12555973

申请日：2009-09-09

Applicant: Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

Inventor： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC: H04J11/00 ,  H04B17/00

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08675718B2

公开(公告)日：2014-03-18

申请号：US12571494

申请日：2009-10-01

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04B1/38 ,  H04L27/00 ,  H04L7/00

CPC classification number: H04L25/03343 ,  H04B7/024 ,  H04B7/0617 ,  H04L5/0035 ,  H04L25/0204

Abstract: Precoder weights employed at a base station which coordinates with other base stations to form a super-cell are determined by: (a) determining an initial downlink precoding matrix at the base station for a mobile station serviced by the base station in the super-cell; (b) revising a downlink receiver matrix associated with the mobile station based on the initial downlink precoding matrix; (c) transforming the downlink receiver matrix to an uplink precoder matrix associated with the mobile station; (d) revising an uplink receiver matrix associated with each base station in uplink communication with the mobile station based on the uplink precoder matrix associated with the mobile station; and (e) revising the initial downlink precoding matrix by transforming the uplink receiver matrix to a revised downlink precoding matrix. Steps (b), (c), (d) and (e) are repeated for a particular number of iterations to determine a final downlink precoding matrix for the mobile station.

Abstract translation: 通过以下方式确定在与其他基站协调以形成超小区的基站处采用的预编码器权重：（a）确定在基站处由基站在超小区中服务的移动台的初始下行链路预编码矩阵 ; （b）基于初始下行链路预编码矩阵修改与移动台相关联的下行链路接收机矩阵; （c）将所述下行链路接收机矩阵变换为与所述移动台相关联的上行链路预编码器矩阵; （d）基于与所述移动站相关联的所述上行链路预编码器矩阵，修改与所述移动站的上行链路通信中与每个基站相关联的上行链路接收机矩阵; 以及（e）通过将所述上行链路接收机矩阵变换为修改的下行链路预编码矩阵来修改所述初始下行链路预编码矩阵。 对于特定次数的迭代重复步骤（b），（c），（d）和（e）以确定移动台的最终下行链路预编码矩阵。

公开(公告)号：US08442449B2

公开(公告)日：2013-05-14

申请号：US12941114

申请日：2010-11-08

Applicant: Dennis Hui ,  Jung-Fu Cheng ,  Kambiz Zangi ,  Leonid Krasny

Inventor： Dennis Hui ,  Jung-Fu Cheng ,  Kambiz Zangi ,  Leonid Krasny

IPC: H04B1/00 ,  H04B7/00

CPC classification number: H04B7/0417 ,  H04B7/065 ,  H04B7/0658 ,  H04B7/066 ,  H04B7/0663

Abstract: A receiver and a method are described herein for reducing an amount of channel state information related to a transmit channel correlation matrix ΦTX that is feedback to a transmitter. In addition, to a transmitter and a method are described herein for reconstructing the transmit channel correlation matrix φTX using the reduced channel state feedback information received from the receiver.

Abstract translation: 本文描述了一种接收机和方法，用于减少与向发射机反馈的发射信道相关矩阵PhiTX相关的信道状态信息量。 此外，本文描述了一种发射机和方法，用于使用从接收机接收的减少的信道状态反馈信息重建发射信道相关矩阵phiTX。

公开(公告)号：US08379709B2

公开(公告)日：2013-02-19

申请号：US12204217

申请日：2008-09-04

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04L27/01

CPC classification number: H04B1/1027 ,  H04L25/0228 ,  H04L25/03019

Abstract: The present invention provides a method and apparatus for channel estimation when the amplitude of a received signal is hard-limited. A channel estimator computes amplitude estimates for the received signal based on the phase samples of the received signal and previous channel estimates. The amplitude estimates may comprise the expected values of the amplitude given the phase samples and the initial channel estimates. The channel estimator then computes revised channel estimates based on the amplitude estimates and the phase samples. The process may be performed iteratively to refine the channel estimates during each iteration.

Abstract translation: 本发明提供了当接收信号的幅度受到严格限制时的信道估计方法和装置。 信道估计器基于接收信号和先前信道估计的相位采样来计算接收信号的幅度估计。 幅度估计可以包括给定相位采样的幅度的预期值和初始信道估计。 然后，信道估计器基于幅度估计和相位样本来计算修正的信道估计。 可以迭代地执行该过程以在每次迭代期间优化信道估计。

公开(公告)号：US20120100877A1

公开(公告)日：2012-04-26

申请号：US13335482

申请日：2011-12-22

Applicant: Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

Inventor： Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC: H04W24/02

CPC classification number: H04B7/024

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100279729A1

公开(公告)日：2010-11-04

申请号：US12746372

申请日：2008-01-08

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04B7/00

CPC classification number: H04B7/0617 ,  H04B7/024 ,  H04B7/0426 ,  H04B7/0465 ,  H04W52/346

Abstract: In a distributed antenna system that includes a plurality of transmitters and a controller, a method, performed by the controller, may be characterized by performing dirty-paper coding on downlink transmissions to users based on an order of the users, calculating beamforming vectors to provide that each of the downlink transmissions associated with each of the users does not interfere with other users, and maximizing, based on the calculated beamforming vectors, a data rate subject to a power constraint of the distributed antenna system.

Abstract translation: 在包括多个发射机和控制器的分布式天线系统中，由控制器执行的方法的特征在于，基于用户的次序对用户的下行链路传输执行脏纸编码，计算波束形成向量以提供 与每个用户相关联的每个下行链路传输不会干扰其他用户，并且基于所计算的波束形成向量，最大化受到分布式天线系统的功率约束的数据速率。

公开(公告)号：US08923110B2

公开(公告)日：2014-12-30

申请号：US12555973

申请日：2009-09-09

Applicant: Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

Inventor： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC: H04J11/00 ,  H04B7/02 ,  H04B17/00 ,  H04L1/20 ,  H04L25/02 ,  H04L1/00 ,  H04B7/06

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08219128B2

公开(公告)日：2012-07-10

申请号：US12483603

申请日：2009-06-12

Applicant: Kambiz Zangi ,  Abdulrauf Hafeez ,  Dennis Hui

Inventor： Kambiz Zangi ,  Abdulrauf Hafeez ,  Dennis Hui

IPC: H04B15/00 ,  H04B17/00 ,  H04B7/185

CPC classification number: H04L1/0001 ,  H04J11/0053 ,  H04L1/0022 ,  H04L1/0034 ,  H04L5/0035

Abstract: 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).

Abstract translation: 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）。

公开(公告)号：US08107965B2

公开(公告)日：2012-01-31

申请号：US12547817

申请日：2009-08-26

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04W52/30

CPC classification number: H04B7/024 ,  H04B7/0615 ,  H04W52/365

Abstract: 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.

Abstract translation: 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。