公开(公告)号：US08249186B2

公开(公告)日：2012-08-21

申请号：US12566194

申请日：2009-09-24

申请人： Chang-Soo Koo ,  Robert L. Olesen

发明人： Chang-Soo Koo ,  Robert L. Olesen

IPC分类号： H04L27/04

CPC分类号： H04B7/0417 ,  G06F17/16 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0634 ,  H04B7/0663 ,  H04L25/0208 ,  H04L25/0248 ,  H04L27/2647

摘要： A method and apparatus for decomposing a channel matrix in a wireless communication system are disclosed. A channel matrix H is generated for channels between transmit antennas and receive antennas. A Hermitian matrix A=HHH or A=HHH is created. A Jacobi process is cyclically performed on the matrix A to obtain Q and DA matrixes such that A=QDAQH. DA is a diagonal matrix obtained by singular value decomposition (SVD) on the A matrix. In each Jacobi transformation, real part diagonalization is performed to annihilate real parts of off-diagonal elements of the matrix and imaginary part diagonalization is performed to annihilate imaginary parts of off-diagonal elements of the matrix after the real part diagonalization. U, V and DH matrixes of H matrix are then calculated from the Q and DA matrices. DH is a diagonal matrix comprising singular values of the H matrix.

摘要翻译： 公开了一种在无线通信系统中分解信道矩阵的方法和装置。 为发射天线和接收天线之间的信道生成信道矩阵H. 创建Hermitian矩阵A = HHH或A = HHH。 在矩阵A上循环执行Jacobi过程以获得Q和DA矩阵，使得A = QDAQH。 DA是通过在A矩阵上的奇异值分解（SVD）获得的对角矩阵。 在每个雅可比变换中，执行实部对角化以湮灭矩阵的非对角元素的实部，并且执行虚部对角化​​以在实部对角化之后湮灭矩阵的非对角元素的虚部。 然后从Q和DA矩阵计算H矩阵的U，V和DH矩阵。 DH是包括H矩阵的奇异值的对角矩阵。

公开(公告)号：US08130855B2

公开(公告)日：2012-03-06

申请号：US11254358

申请日：2005-10-20

申请人： Jaeyoung Kwak ,  Chang-Soo Koo ,  Robert Lind Olesen ,  Aykut Bultan ,  Fatih Ozluturk

发明人： Jaeyoung Kwak ,  Chang-Soo Koo ,  Robert Lind Olesen ,  Aykut Bultan ,  Fatih Ozluturk

IPC分类号： H04L1/02 ,  H04B7/02

CPC分类号： H04L1/0606 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0697 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/04 ,  H04L5/0007 ,  H04L25/0248 ,  H04L27/2601 ,  H04L27/2626 ,  H04L27/2647

摘要： A method and apparatus for combining space-frequency block coding (SFBC), spatial multiplexing (SM) and beamforming in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The system includes a transmitter with a plurality of transmit antennas and a receiver with a plurality of receive antennas. The transmitter generates at least one data stream and a plurality of spatial streams. The number of generated spatial streams is based on the number of the transmit antennas and the number of the receive antennas. The transmitter determines a transmission scheme in accordance with at least one of SFBC, SM and beam forming. The transmitter transmits data in the data stream to the receiver based on the selected transmission scheme.

摘要翻译： 一种用于在多输入多输出（MIMO）正交频分复用（OFDM）系统中组合空间频率块编码（SFBC），空间复用（SM）和波束形成的方法和装置。 该系统包括具有多个发射天线的发射机和具有多个接收天线的接收机。 发射机产生至少一个数据流和多个空间流。 所生成的空间流的数量基于发射天线的数量和接收天线的数量。 发射机根据SFBC，SM和波束形成中的至少一个确定传输方案。 发射机根据所选择的传输方案向接收机发送数据流中的数据。

公开(公告)号：US20110268028A1

公开(公告)日：2011-11-03

申请号：US13078531

申请日：2011-04-01

申请人： Janet A. Stern-Berkowitz ,  Chang-Soo Koo ,  Peter S. Wang ,  Sung-Hyuk Shin ,  John W. Haim ,  Stephen G. Dick ,  Mihaela C. Beluri

发明人： Janet A. Stern-Berkowitz ,  Chang-Soo Koo ,  Peter S. Wang ,  Sung-Hyuk Shin ,  John W. Haim ,  Stephen G. Dick ,  Mihaela C. Beluri

IPC分类号： H04W4/00

CPC分类号： H04W52/325 ,  H04L5/0048 ,  H04L27/2613

摘要： Methods and apparatus for sounding reference signals (SRS) configuration and transmission. The methods include receiving configuration of wireless transmit/receive unit (WTRU)-specific SRS subframes for transmitting SRS and upon receipt of a trigger, transmitting the SRS for a number of antennas. The SRS transmissions may occur in each subframe of a duration of WTRU-specific SRS subframes that start a number of WTRU-specific SRS subframes after a triggering subframe. For multiple SRS transmissions from multiple antennas, cyclic shift multiplexing and different transmission combs may be used. The cyclic shift for an antenna may be determined from a cyclic shift reference value. The cyclic shift determined for each antenna providing a maximum distance between cyclic shifts for the antennas transmitting SRS in a same WTRU-specific subframe. SRS transmissions from multiple antennas in the WTRU-specific subframe may be done in parallel. Methods for handling collisions between SRS and physical channels are presented.

摘要翻译： 用于探测参考信号（SRS）配置和传输的方法和装置。 所述方法包括接收用于发送SRS的无线发射/接收单元（WTRU）特定的SRS子帧的配置，以及在接收到触发时，发射多个天线的SRS。 SRS传输可以发生在在触发子帧之后开始多个WTRU特定SRS子帧的WTRU特定SRS子帧的持续时间的每个子帧中。 对于来自多个天线的多个SRS传输，可以使用循环移位复用和不同的传输梳。 可以从循环移位基准值确定天线的循环移位。 为在相同的WTRU特定子帧中发射SRS的天线的循环移位之间提供最大距离的每个天线确定的循环移位。 WTRU特定子帧中的多个天线的SRS传输可以并行完成。 介绍了SRS和物理通道之间的碰撞处理方法。

公开(公告)号：US07864659B2

公开(公告)日：2011-01-04

申请号：US11118867

申请日：2005-04-29

申请人： Chang-Soo Koo ,  Robert Lind Olesen

发明人： Chang-Soo Koo ,  Robert Lind Olesen

IPC分类号： H04J11/00

CPC分类号： H04B7/0417 ,  H04B17/336 ,  H04L1/0002 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L27/2601 ,  Y02D50/10

摘要： A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are measured and compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent back to the transmitting transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained. At the receiver, the target QoS metric and reference data rate are adjusted accordingly. This process is repeated for each data frame of each sub-carrier group.

摘要翻译： 一种用于优化与多输入多输出（MIMO）天线一起使用的正交频分复用（OFDM）系统的系统容量的方法和装置。 在接收机中，设置目标服务质量（QoS）度量和参考数据速率。 可以将目标QoS度量设置为预定值和/或可以通过慢速外部环路控制处理器相对于分组错误率（PER）动态地调整。 测量接收信号的QoS并将其与目标QoS进行比较。 根据比较，接收机产生信道质量指示符（CQI），其被发送回发送发射机。 CQI是一个或两个比特指示符，其向发射机指示禁用，调整或维持特定子载波，每个发射天线的子载波组或跨所有发射天线的子载波组的数据传输速率。 在发射机处，传输的数据速率被禁用，调整或维护。 在接收机处，相应地调整目标QoS度量和参考数据速率。 对于每个子载波组的每个数据帧重复该处理。

公开(公告)号：US07860526B2

公开(公告)日：2010-12-28

申请号：US12493986

申请日：2009-06-29

申请人： Chang-Soo Koo ,  Sudheer A. Grandhi ,  Stephen E. Terry

发明人： Chang-Soo Koo ,  Sudheer A. Grandhi ,  Stephen E. Terry

IPC分类号： H04B7/00 ,  H04Q11/12

CPC分类号： H04W52/12 ,  H04W52/10 ,  H04W52/143 ,  H04W52/241 ,  H04W52/36 ,  H04W52/362 ,  H04W52/50

摘要： An integrated circuit configured for outer loop power control uses data transmitted in temporary dedicated channel allocations. A target metric, preferably, target SIR, is adjusted with differing step up and step down increments to converge on a relatively low steady state level of step up and step down target metric adjustments. The initial target SIR and the transient step size for target SIR adjustment is determined in a dynamic way in the outer loop power control for each Temp-DCH allocation of non-real time data.

摘要翻译： 配置用于外环功率控制的集成电路使用在临时专用信道分配中发送的数据。 目标度量，优选目标SIR，以不同的升压和降压增量进行调整，以收敛于相对低的稳态水平的升压和降压目标度量调节。 在非实时数据的每个Temp-DCH分配的外环功率控制中，以动态方式确定目标SIR调整的初始目标SIR和瞬态步长。

公开(公告)号：US07657278B2

公开(公告)日：2010-02-02

申请号：US11234629

申请日：2005-09-23

申请人： Chang-Soo Koo ,  Donald M. Grieco ,  Jaeyoung Kwak

发明人： Chang-Soo Koo ,  Donald M. Grieco ,  Jaeyoung Kwak

IPC分类号： H04W52/24 ,  H04W52/40

CPC分类号： H04W52/40 ,  H04W52/146

摘要： A method and apparatus for deriving a combined transmit power control (TPC) command during handover are disclosed. During handover, a combined TPC command is generated from two or more TPC commands. The combined TPC command is set to −1 for decrease of the transmit power if a soft symbol of the TPC signal from any cell indicates decrease of the transmit power and the signal-to-interference ratio for the cell is greater than a reliability threshold. Otherwise, the combined TPC command is set to −1 if the function γ is not greater than the combining threshold, and set to +1 if the function γ is greater than the combining threshold, where the function γ represents a log-likelihood ratio of a probability density function of the combined TPC command.

摘要翻译： 公开了一种用于在切换期间导出组合发射功率控制（TPC）命令的方法和装置。 在切换期间，从两个或多个TPC命令生成组合的TPC命令。 如果来自任何小区的TPC信号的软符号表示发射功率的降低，并且小区的信号干扰比大于可靠性阈值，则组合的TPC命令被设置为-1以降低发射功率。 否则，如果函数gamma不大于组合阈值，则将组合的TPC命令设置为-1，如果函数gamma大于组合阈值，则将其设置为+1，其中函数gamma表示对数似然比 组合TPC命令的概率密度函数。

公开(公告)号：US20090264146A1

公开(公告)日：2009-10-22

申请号：US12493986

申请日：2009-06-29

申请人： Chang-Soo Koo ,  Sudheer A. Grandhi ,  Stephen E. Terry

发明人： Chang-Soo Koo ,  Sudheer A. Grandhi ,  Stephen E. Terry

IPC分类号： H04B7/005

CPC分类号： H04W52/12 ,  H04W52/10 ,  H04W52/143 ,  H04W52/241 ,  H04W52/36 ,  H04W52/362 ,  H04W52/50

摘要： An integrated circuit configured for outer loop power control uses data transmitted in temporary dedicated channel allocations. A target metric, preferably, target SIR, is adjusted with differing step up and step down increments to converge on a relatively low steady state level of step up and step down target metric adjustments. The initial target SIR and the transient step size for target SIR adjustment is determined in a dynamic way in the outer loop power control for each Temp-DCH allocation of non-real time data.

摘要翻译： 配置用于外环功率控制的集成电路使用在临时专用信道分配中发送的数据。 目标度量，优选目标SIR，以不同的升压和降压增量进行调整，以收敛于相对低的稳态水平的升压和降压目标度量调节。 在非实时数据的每个Temp-DCH分配的外环功率控制中以动态方式确定目标SIR调整的初始目标SIR和瞬态步长。

公开(公告)号：US07406130B2

公开(公告)日：2008-07-29

申请号：US11524225

申请日：2006-09-20

申请人： Yuejin Huang ,  Robert Lind Olesen ,  Chang-Soo Koo

发明人： Yuejin Huang ,  Robert Lind Olesen ,  Chang-Soo Koo

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04L27/262 ,  H04B7/02 ,  H04B7/0684 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2614

摘要： The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.

摘要翻译： 本发明涉及一种用于在正交频分复用（OFDM）多输入多输出（MIMO）无线通信系统中优化信道估计和同步的方法和系统。 根据本发明，通过循环移位基本代码，基于基本代码简单地构建所有的训练序列。 训练序列并行地从不同的天线发射，而不进行快速傅立叶逆变换。 因此，没有峰均比例问题。 基于快速傅立叶变换之前的样本在每个接收机中执行信道估计，然后将时域中的信道响应的最大似然估计值映射到频域。 信道估计不仅在实现上非常简单，而且在计算上也非常有效。

公开(公告)号：US20080144733A1

公开(公告)日：2008-06-19

申请号：US11842252

申请日：2007-08-21

申请人： Hesham ElGamal ,  Aykut Bultan ,  Chang-Soo Koo

发明人： Hesham ElGamal ,  Aykut Bultan ,  Chang-Soo Koo

IPC分类号： H04B7/02 ,  H04L27/28

CPC分类号： H04L1/0003 ,  H04L1/0606 ,  H04L1/0618 ,  H04L1/0625 ,  H04L1/0643 ,  H04L1/0656 ,  H04L1/0687 ,  H04L1/0693 ,  H04L1/1819

摘要： The downlink (DL) communication of single channel codewords is supported by providing a multiple-input multiple-output (MIMO) transmitter and receiver. The transmitter includes NT transmit antennas for transmitting spatial streams to a receiver having NR receive antennas, a precoder and a space-time or space-frequency matrix construction unit in communication with the precoder and the transmit antennas. The space-time or space-frequency matrix construction unit constructs a matrix that defines a threaded algebraic space-time (TAST) codeword based on a number of virtual antennas, NV, and the number of transmit antennas, NT. The transmitter operates in an open loop mode when no feedback information from the receiver is available, a semi-open loop mode when channel rank information is available, and a closed loop mode when channel state information (CSI) is available. The receiver is configured to provide feedback to the transmitter on a per received spatial stream basis

摘要翻译： 通过提供多输入多输出（MIMO）发射机和接收机来支持单信道码字的下行链路（DL）通信。 发射机包括用于将空间流发送到具有N个N个接收天线的接收机的N T个发射天线，通信中的预编码器和时空或空时矩阵构造单元 与预编码器和发射天线。 空时或空频矩阵构造单元构造一个矩阵，该矩阵基于多个虚拟天线N N V N定义线性代数空时（TAST）码字，并且发射天线的数量 ，N T T。 当没有来自接收机的反馈信息可用时，发射机以开环模式工作，当信道秩信息可用时为半开环模式，当信道状态信息（CSI）可用时为闭环模式）。 接收器被配置为在每个接收到的空间流的基础上向发射机提供反馈

公开(公告)号：US07363049B2

公开(公告)日：2008-04-22

申请号：US10266882

申请日：2002-10-07

申请人： Sung-Hyuk Shin ,  Fatih Ozluturk ,  Ariela Zeira ,  Chang-Soo Koo

发明人： Sung-Hyuk Shin ,  Fatih Ozluturk ,  Ariela Zeira ,  Chang-Soo Koo

IPC分类号： H04B7/00

CPC分类号： H04W52/228 ,  H04W52/08 ,  H04W52/221 ,  H04W52/226 ,  H04W52/242 ,  H04W52/243 ,  H04W52/248 ,  H04W52/36

摘要： A transmitting station receives a transmit power command and a reference signal. The transmit power command indicates an increase or decrease in transmission power for the transmitting station. A received power level of the reference signal is measured and the measured reference signal received power level is compared to a transmit power level of the reference signal to produce a pathloss estimate of the reference signal. A size of a change in transmit power level is determined using the pathloss estimate. A transmission power level of the transmitting station is adjusted in response to the transmit power command in an amount of the determined change in size. A communication is transmitted at the adjusted transmission power level.

摘要翻译： 发射站接收发射功率命令和参考信号。 发送功率指示表示发送站的发送功率的增加或减少。 测量参考信号的接收功率电平，并将测量的参考信号接收功率电平与参考信号的发射功率电平进行比较，以产生参考信号的路径损耗估计。 使用路径损耗估计来确定发射功率电平变化的大小。 响应于所确定的大小变化量的发射功率命令来调整发射台的发射功率电平。 以调整的发送功率电平发送通信。