公开(公告)号：US20120051467A1

公开(公告)日：2012-03-01

申请号：US13050697

申请日：2011-03-17

Applicant: Yi-Pin Eric WANG ,  Dennis Hui

Inventor： Yi-Pin Eric WANG ,  Dennis Hui

IPC: H04L27/00

CPC classification number: H04L25/08 ,  H04L25/03012 ,  H04L25/03159 ,  H04L25/03171 ,  H04L25/03184 ,  H04L25/03312 ,  H04L25/03331 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: In one of its aspects the technology disclosed herein concerns a method of operating a receiver. The method comprises performing symbol detection by (1) receiving a frequency-domain signal that comprises contribution from time-domain symbols transmitted from one or more transmit antennas; (2) generating a transformation matrix and a triangular matrix based on a frequency domain channel response; (3) using the transformation matrix to transform the received frequency-domain signal to obtain a transformed frequency-domain signal; and (4) performing symbol detection by performing plural stages of detection, each stage of detection using elements of the transformed frequency-domain received signal associated with the detection stage.

Abstract translation: 在其中的一个方面，本文公开的技术涉及操作接收机的方法。 该方法包括：（1）接收包括从一个或多个发射天线发射的时域符号的贡献的频域信号; （2）基于频域信道响应生成变换矩阵和三角矩阵; （3）使用变换矩阵来变换接收到的频域信号以获得变换的频域信号; 和（4）通过执行多级检测来执行符号检测，每个检测阶段使用与检测级相关联的变换的频域接收信号的元素。

公开(公告)号：US08000420B2

公开(公告)日：2011-08-16

申请号：US11993507

申请日：2005-06-24

Applicant: Dennis Hui ,  Abdulrauf Hafeez

Inventor： Dennis Hui ,  Abdulrauf Hafeez

IPC: H03D1/06 ,  H04B1/10

CPC classification number: H04L25/0204 ,  H04L7/041 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/0244 ,  H04L25/03993

Abstract: A system and method in a radio receiver for joint synchronization and noise covariance estimation of a received signal. A spatially and temporally stacked signal model, whereby successive samples of temporally adjacent received signal vectors and corresponding training vectors are stacked, is used in the derivation of the estimation problem. The Toeplitz structure of the channel response matrix is neglected in the formulation of the estimation problem. The resulting estimator jointly estimates a synchronization position, a channel response matrix, and a noise covariance matrix. An estimate of a whitened channel is then computed based on the noise covariance matrix and the estimate of the channel response matrix.

Abstract translation: 用于接收信号的联合同步和噪声协方差估计的无线电接收机中的系统和方法。 空间和时间叠加的信号模型，其中叠加时间上相邻的接收信号矢量和对应的训练矢量的连续样本，用于推导估计问题。 通道响应矩阵的Toeplitz结构在估计问题的描述中被忽略。 所得到的估计器共同估计同步位置，信道响应矩阵和噪声协方差矩阵。 然后，基于噪声协方差矩阵和信道响应矩阵的估计来计算白化信道的估计。

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：US20080205451A1

公开(公告)日：2008-08-28

申请号：US11678946

申请日：2007-02-26

Applicant: Rajaram Ramesh ,  Dennis Hui

Inventor： Rajaram Ramesh ,  Dennis Hui

IPC: H04B3/10

CPC classification number: H04L5/0007 ,  H04L5/0048 ,  H04L5/0058

Abstract: Transmission scheme for the uplink of FDMA systems that improves performance in an interference-dominated system by using a pilot scheme that provides enough information so that channel estimates can be obtained for a particular user, but which at the same time makes it possible to use pilot patterns that are different in different cells so that co-channel interference is mitigated. A codeword is used to position a set of pilot symbols within a set of subcarriers wherein each subcarrier has a first pilot time slot and a second pilot time slot associated with one or more data time slots. The set of subcarriers are identified on which to transmit the composite signal and the first pilot time slots and the second pilot time slots are filled with the pilot symbols in accordance with the codeword. The composite signal is then formatted as a combination of modulated data and pilot signals.

Abstract translation: 用于通过使用提供足够信息的导频方案来改善以干扰为主的系统中的性能的FDMA系统的上行链路的传输方案，以便可以为特定用户获得信道估计，但同时使得可以使用导频 在不同的小区中不同的模式，从而减轻了同信道干扰。 码字用于将一组导频符号定位在一组子载波中，其中每个子载波具有与一个或多个数据时隙相关联的第一导频时隙和第二导频时隙。 识别发射复合信号的子载波集合，并且根据码字对导频符号填充第一导频时隙和第二导频时隙。 然后将复合信号格式化为调制数据和导频信号的组合。

公开(公告)号：US20070259681A1

公开(公告)日：2007-11-08

申请号：US11741083

申请日：2007-04-27

Applicant: Jung-fu Cheng ,  Anders Furuskar ,  Dennis Hui ,  Muhammad Ali Kazmi ,  Arne Simonssson ,  Per Skillermark

Inventor： Jung-fu Cheng ,  Anders Furuskar ,  Dennis Hui ,  Muhammad Ali Kazmi ,  Arne Simonssson ,  Per Skillermark

IPC: H04B7/00

CPC classification number: H04L27/2608 ,  H04L5/006 ,  H04L5/0062 ,  H04L27/364 ,  H04W72/1231

Abstract: According to methods and apparatus taught herein, user equipments (UEs) in a wireless communication network are scheduled based on determining received signal power densities for a plurality of UEs to be scheduled, allocating UEs to scheduling intervals based on a sorting of their received signal power densities, and assigning UEs in the same scheduling interval to mirror frequency bands within an available frequency spectrum according to the sorting. For example, UEs to be scheduled are assigned to a given scheduling interval in rank order of their received signal power densities until the scheduling interval is fully allocated. Remaining UEs are assigned in rank order to one or more other scheduling intervals, and the process may be repeated or otherwise carried out on an ongoing basis. Such an allocation scheme tends to minimize both adjacent frequency and mirror frequency interferences between UEs scheduled in the same interval.

Abstract translation: 根据本文教导的方法和装置，基于确定要调度的多个UE的接收信号功率密度来调度无线通信网络中的用户设备（UE），基于对其接收信号功率的分类，将UE分配到调度间隔 并且按照相同的调度间隔分配UE以根据排序来反映可用频谱内的频带。 例如，要调度的UE被分配给其接收信号功率密度的等级的给定调度间隔，直到调度间隔被完全分配为止。 剩余的UE被按照等级顺序分配给一个或多个其他调度间隔，并且该过程可以在持续的基础上重复或以其他方式执行。 这种分配方案倾向于最小化在相同间隔中调度的UE之间的相邻频率和镜像频率干扰。

公开(公告)号：US06778619B2

公开(公告)日：2004-08-17

申请号：US09853207

申请日：2001-05-11

Applicant: Kambiz C. Zangi ,  Dennis Hui

Inventor： Kambiz C. Zangi ,  Dennis Hui

IPC: H04L102

CPC classification number: H04L25/03331 ,  H04L1/0618 ,  H04L25/03299

Abstract: A method for receiving transmissions includes receiving a first symbol-spaced baseband signal corresponding to first portions of first and second encoded data sequences transmitted over first and second baseband channels, and receiving a second symbol-spaced baseband signal corresponding to second portions of the first and second encoded data sequences transmitted over the first and second baseband channels. The first and second symbol-spaced baseband signals are combined to provide a combined baseband signal, and the combined baseband signal is prefiltered to provide minimum phase channel characteristics. The prefiltered combined baseband signal is equalized to provide an estimate of a data sequence. Related receivers are also discussed.

Abstract translation: 一种用于接收传输的方法包括：接收对应于通过第一和第二基带信道发送的第一和第二编码数据序列的第一部分的第一符号间隔基带信号，以及接收对应于第一和第二基带信道的第二部分的第二符号间隔基带信号， 通过第一和第二基带信道发射的第二编码数据序列。 第一和第二符号间隔的基带信号被组合以提供组合的基带信号，并且组合的基带信号被预过滤以提供最小的相位通道特性。 预过滤的组合基带信号被相等以提供数据序列的估计。 还讨论了相关接收机。

公开(公告)号：US06359935B1

公开(公告)日：2002-03-19

申请号：US09317782

申请日：1999-05-24

Applicant: Dennis Hui ,  Ali S. Khayrallah

Inventor： Dennis Hui ,  Ali S. Khayrallah

IPC: H04L3202

CPC classification number: H04L1/005 ,  H04L1/0059 ,  H04L1/0061 ,  H04L1/0065 ,  H04L1/0068 ,  H04L1/0071 ,  H04L27/2332 ,  H04L2001/0098

Abstract: A receiver (300) for a communication device (102) includes a multiple symbol differential demodulator (304, 316) and a convolutional decoder (308) and a feedback loop (313). The feedback is used to improve the quality of the demodulation during a second pass through the demodulator. The demodulator has a trellis structure which reduces complexity.

Abstract translation: 用于通信设备（102）的接收机（300）包括多符号差分解调器（304,316）和卷积解码器（308）和反馈回路（313）。 反馈用于在通过解调器的第二次通过期间提高解调的质量。 解调器具有网格结构，降低了复杂度。

公开(公告)号：US08923148B2

公开(公告)日：2014-12-30

申请号：US13439759

申请日：2012-04-04

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

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

IPC: H04L12/26 ,  H04B7/02 ,  H04L1/20 ,  H04B17/00 ,  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: 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-uniformly 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.

Abstract translation: 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调多点计算，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非均匀间隔的子载波上接收和处理参考符号。 对于每个选择的子载波的频率响应是常规估计的，并且在上行链路控制信道上量化并传输到网络。 非均匀子载波选择可以以各种方式与网络同步。

公开(公告)号：US08879428B2

公开(公告)日：2014-11-04

申请号：US13308776

申请日：2011-12-01

Applicant: Dennis Hui ,  Jiann-Ching Guey

Inventor： Dennis Hui ,  Jiann-Ching Guey

IPC: H04L12/28

CPC classification number: H04L43/04 ,  H04L41/0823 ,  H04W16/02 ,  H04W24/02

Abstract: Systems and method are disclosed for graph-based distributed parameter coordination in a communication network. In general, discrete local parameters to be coordinated among communication nodes in the network and their respective performance metrics, or costs, are modeled using a factor graph. Based on the factor graph, a variant of the sum-product algorithm, namely the min-sum algorithm, is applied in order for the communication nodes, through iterative message passing with their neighboring communication nodes, to decide upon optimal values for the local parameters for the communication nodes that collectively optimize a global performance metric across the communication network. In one embodiment, the communication network is a wireless communication network. In one specific embodiment, the wireless communication network is a cellular communication network.

Abstract translation: 公开了用于通信网络中基于图的分布式参数协调的系统和方法。 通常，使用因子图来建模要在网络中的通信节点之间协调的离散局部参数及其各自的性能度量或成本。 基于因子图，应用和积算法的一个变体，即最小和算法，以便通信节点通过与其相邻通信节点的迭代消息传递来决定本地参数的最优值 对于通过通信网络共同优化全局性能度量的通信节点。 在一个实施例中，通信网络是无线通信网络。 在一个具体实施例中，无线通信网络是蜂窝通信网络。

公开(公告)号：US08837621B2

公开(公告)日：2014-09-16

申请号：US13342688

申请日：2012-01-03

Applicant: Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

Inventor： Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

IPC: H04B7/02 ,  H04L25/02 ,  H04L5/00 ,  H04B7/06 ,  H04L25/03

CPC classification number: H04B7/0413 ,  H04B7/0626 ,  H04B7/0691 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0232 ,  H04L2025/03808

Abstract: A transmitter, receiver, and method for channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which the transmitter includes a multiplicity of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level. The transmitter selects a subset of the multiplicity of transmit antennas for transmitting the pilot reference signals. The pilot reference signals are transmitted only from the selected subset of transmit antennas to the receiver. The receiver includes a channel estimator configured to derive a channel estimation for all of the multiplicity of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the multiplicity of transmit antennas.

Abstract translation: 一种用于多输入多输出（MIMO）通信系统的信道估计的发射机，接收机和方法，其中所述发射机包括多个发射天线，所述多个发射天线间隔开，使得相邻天线之间的间隔提供大于阈值水平的空间相关系数 。 发射机选择用于发射导频参考信号的多个发射天线的子集。 导频参考信号仅从选定的发射天线子集发射到接收机。 接收机包括信道估计器，其被配置为使用所接收的导频参考信号和多个发射天线之间的已知或估计的空间相关性来导出所有多个发射天线的信道估计。