公开(公告)号：US20120207251A1

公开(公告)日：2012-08-16

申请号：US13457903

申请日：2012-04-27

Applicant: Dennis Hui

Inventor： Dennis Hui

IPC: H04L27/06

CPC classification number: H04L27/2657 ,  H04L27/2671 ,  H04L27/2676 ,  H04L2027/0053 ,  H04L2027/0073

Abstract: An iterative, blind, frequency-offset estimation process that does not require any training signal or demodulated information symbols is disclosed. Receivers embodying the disclosed processes can produce periodic frequency-offset estimates, without running computationally intensive equalization or demodulation algorithms, by exploiting the temporal correlation of the received signal in the time domain, as well as the received signal's correlation across in-phase and quadrature dimensions, in some embodiments, to find a frequency-offset estimate that best fits the received signal in a maximum-likelihood sense. In an exemplary method of estimating receiver frequency offset, a spatially stacked signal block is formed from multi-branch signal samples corresponding to each of two or more time-separated samples of the received signal. The spatially stacked signal block is used in computing a maximum-likelihood joint estimate of the receiver frequency offset and the spatial covariance of the spatially stacked signal block de-rotated by the receiver frequency offset.

Abstract translation: 公开了不需要任何训练信号或解调信息符号的迭代盲盲频率估计过程。 实现所公开的处理的接收机可以通过利用时域中的接收信号的时间相关性以及接收信号在同相和正交尺度上的相关性来产生周期性的频偏估计，而不需要运行计算密集的均衡或解调算法 在一些实施例中，以最大似然意义找到最适合接收信号的频偏估计。 在估计接收机频率偏移的示例性方法中，空间堆叠的信号块由对应于接收信号的两个或多个时间分离样本中的每一个的多分支信号样本形成。 空间堆叠的信号块用于计算接收机频率偏移的最大似然联合估计和由接收机频率偏移去旋转的空间堆叠信号块的空间协方差。

公开(公告)号：US08229050B2

公开(公告)日：2012-07-24

申请号：US12601568

申请日：2007-05-28

Applicant: Miguel Lopez ,  Gustav Almqvist ,  Tomas Andersson ,  Dennis Hui

Inventor： Miguel Lopez ,  Gustav Almqvist ,  Tomas Andersson ,  Dennis Hui

IPC: H04L7/00 ,  H04K3/00

CPC classification number: H04L25/0216

Abstract: In a method of enabling model order selection for joint channel synchronization and noise covariance estimation of at least one received signal in a wireless communication network, generating S0 a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors, computing S1 a noise variance matrix for each hypothesized synchronization position, channel length and stacking order, based on the stacked training symbols: determining S2 a best synchronization position for the received signal, based on the stacked training vectors, by jointly determining the best synchronization position for the received signal and estimating a channel length and a stacking order for said signal model based on the stacked training vectors.

Abstract translation: 在对无线通信网络中的至少一个接收信号进行联合信道同步和噪声协方差估计的模型阶选择的方法中，通过堆叠时间上相邻的接收信号向量的相继采样和对应的训练来产生空间和时间叠加的信号模型S0 向量，基于堆叠的训练符号，计算每个假设的同步位置，信道长度和堆叠顺序的噪声方差矩阵：基于堆叠的训练向量，通过共同确定最佳状态来确定S2接收信号的最佳同步位置 基于叠加的训练向量估计所述信号模型的信道长度和堆叠顺序。

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：US08213368B2

公开(公告)日：2012-07-03

申请号：US11777671

申请日：2007-07-13

Applicant: Dennis Hui ,  Leonid Krasny

Inventor： Dennis Hui ,  Leonid Krasny

IPC: H04W4/00

CPC classification number: H04L1/0026 ,  H04L1/0019 ,  H04L1/0029 ,  H04L1/003

Abstract: A method of variable rate vector quantization reduces the amount of channel state feedback. Channel coefficients of a communication channel are determined and second order statistics (e.g., variances) of the channel taps are computed). Bit allocation for the channel taps are determined based on the coefficients statistics. The channel taps are individually quantized at rates determined based on said bit allocations.

Abstract translation: 可变速率矢量量化的方法减少了信道状态反馈的量。 确定通信信道的信道系数，并且计算信道抽头的二阶统计（例如，方差）。 基于系数统计确定信道抽头的位分配。 以基于所述位分配确定的速率单独地量化信道抽头。

公开(公告)号：US20120155274A1

公开(公告)日：2012-06-21

申请号：US12972688

申请日：2010-12-20

Applicant: Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

Inventor： Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

IPC: H04W28/08

CPC classification number: H04L63/1458 ,  H04W12/12

Abstract: A system and method to substantially prevent Denial of Service (DoS) attacks due to Random Access Channel (RACH) overload in cellular wireless networks. Once a mobile handset is identified to cause or contribute significantly to a RACH overload of the cell, the system sends a special System Information Block (SIB) message targeted to that mobile handset and instructing it to redirect its RACH signaling to a separate RACH/PRACH (Physical Random Access Channel) resource or to a small part of the current RACH/PRACH resource. This allows most or all of the regular RACH/PRACH resource from being overloaded by a single user or a group of users. The use of a separate RACH/PRACH resource such as frequency, preamble sequence, and/or radio subframe access slot to “absorb” high volume RACH signaling traffic from a small number of malicious/defective mobile handsets substantially prevents the signaling DoS attacks in the wireless network and makes it more robust to such attacks.

Abstract translation: 一种基本上防止由于蜂窝无线网络中的随机接入信道（RACH）过载引起的拒绝服务（DoS）攻击的系统和方法。 一旦移动手机被识别为小区的RACH重载导致或显着贡献，则系统发送针对该移动手机的专用系统信息块（SIB）消息，并指示其将其RACH信令重定向到单独的RACH / PRACH （物理随机访问信道）资源或当前RACH / PRACH资源的一小部分。 这允许大多数或全部常规RACH / PRACH资源被单个用户或一组用户过载。 使用诸如频率，前导码序列和/或无线电子帧接入时隙的单独的RACH / PRACH资源来从少量的恶意/有缺陷的移动手机“吸收”大容量的RACH信令业务基本上防止了信令DoS攻击 无线网络，并使其对这种攻击更加强大。

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。

公开(公告)号：US20110280287A1

公开(公告)日：2011-11-17

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: H04B1/38 ,  H04B7/02

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：US07979075B2

公开(公告)日：2011-07-12

申请号：US11555294

申请日：2006-11-01

Applicant: Jung-Fu Cheng ,  Stephen J. Grant ,  Dennis Hui ,  Karl James Molnar

Inventor： Jung-Fu Cheng ,  Stephen J. Grant ,  Dennis Hui ,  Karl James Molnar

IPC: H04W72/00

CPC classification number: H04L1/0026 ,  H04L1/0016 ,  H04L1/20 ,  H04W48/08 ,  H04W72/0413 ,  H04W72/085

Abstract: Channel Quality Indicator (CQI) tables are tailored to one or more cells of interest. Tailoring CQI tables to individual cells permits devices such as radio base stations to more reliably and accurately allocate radio resources to those cells since channel conditions vary from cell to cell. According to one embodiment, a table of CQI values is composed by analyzing information indicating channel quality in a cell of interest and generating at least one table of CQI values tailored to the cell of interest based on the information analyzed. The tailored CQI table may be deployed to another device for use in reporting channel quality information. The device may report channel quality by accessing the tailored CQI and identifying the range of CQI values that includes a channel quality estimate derived by the device. The device generates a channel quality information message based on the identified range of CQI values.

Abstract translation: 信道质量指示符（CQI）表针对感兴趣的一个或多个小区而定制。 由于信道条件因单元而异，所以将CQI表裁定到单个小区允许诸如无线电基站之类的设备更可靠地且准确地分配无线电资源给这些小区。 根据一个实施例，通过分析指示感兴趣的小区中的信道质量的信息并基于分析的信息生成针对感兴趣小区定制的CQI值的至少一个表格来组成CQI值表。 可以将定制的CQI表部署到用于报告信道质量信息的另一设备。 设备可以通过访问定制的CQI并且识别包括由设备导出的信道质量估计的CQI值的范围来报告信道质量。 该设备基于所识别的CQI值范围来生成信道质量信息消息。

公开(公告)号：US20100317355A1

公开(公告)日：2010-12-16

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 ,  H04W72/04

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：US20100290382A1

公开(公告)日：2010-11-18

申请号：US12547817

申请日：2009-08-26

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04H20/71

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。