公开(公告)号：US20060072677A1

公开(公告)日：2006-04-06

申请号：US11201695

申请日：2005-08-11

申请人： Jaeyoung Kwak ,  Robert Olesen ,  Aykut Bultan ,  Eldad Zeira ,  Chang-Soo Koo ,  Fatih Ozluturk ,  Yuejin Huang ,  Kalpendu Pasad

发明人： Jaeyoung Kwak ,  Robert Olesen ,  Aykut Bultan ,  Eldad Zeira ,  Chang-Soo Koo ,  Fatih Ozluturk ,  Yuejin Huang ,  Kalpendu Pasad

IPC分类号： H04K1/10

CPC分类号： H04L1/0606 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0632 ,  H04B7/066 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/006 ,  H04L27/156 ,  H04L27/2626 ,  H04L2027/0046 ,  Y02B70/30 ,  Y02D50/10

摘要： The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.

公开(公告)号：US20060133530A1

公开(公告)日：2006-06-22

申请号：US11254358

申请日：2005-10-20

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

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

IPC分类号： H04L1/02

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：US20050101353A1

公开(公告)日：2005-05-12

申请号：US10948963

申请日：2004-09-23

申请人： Eldad Zeira ,  Donald Grieco ,  Robert Olesen ,  Ariela Zeira ,  Jung-Lin Pan ,  Aykut Bultan

发明人： Eldad Zeira ,  Donald Grieco ,  Robert Olesen ,  Ariela Zeira ,  Jung-Lin Pan ,  Aykut Bultan

IPC分类号： H01Q1/24 ,  H01Q3/26 ,  H01Q25/00 ,  H04B1/02 ,  H04B1/38 ,  H04B7/02 ,  H04B7/08 ,  H04B15/00 ,  H04B17/00 ,  H04L20060101 ,  H04M1/00 ,  H04M7/14 ,  H04Q7/20

CPC分类号： H01Q1/246 ,  H01Q3/2605 ,  H01Q25/00 ,  H04B7/088

摘要： A method and system is disclosed for enhancing reception of wireless communication signals. A beam pattern including at least one set of beams is generated. Where the beam pattern includes at least two sets of beams, the beam sets may be offset with respect to each other and alternated to enhance reception. Beams may be selected for data processing based on a signal-to-noise ratio (SNR) and may be maximal-ratio combined where signals from a single WTRU are detected within more than one beam and are used for data processing.

摘要翻译： 公开了一种用于增强无线通信信号的接收的方法和系统。 产生包括至少一组光束的光束图案。 在波束图案包括至少两组波束的情况下，波束组可以相对于彼此偏移并交替以增强接收。 可以基于信噪比（SNR）来选择光束进行数据处理，并且可以在多个波束内检测来自单个WTRU的信号并将其用于数据处理的情况下进行最大比组合。

公开(公告)号：US20070211822A1

公开(公告)日：2007-09-13

申请号：US11621755

申请日：2007-01-10

申请人： Robert Olesen ,  Eldad Zeira ,  Peter Voltz ,  Yongwen Yang ,  Qingyuan Dai ,  Chang-Soo Koo ,  I-Tai Lu ,  KunJu Tsai

发明人： Robert Olesen ,  Eldad Zeira ,  Peter Voltz ,  Yongwen Yang ,  Qingyuan Dai ,  Chang-Soo Koo ,  I-Tai Lu ,  KunJu Tsai

IPC分类号： H04L27/00 ,  H04L1/02

CPC分类号： H04L1/0643 ,  H04B7/0456 ,  H04B7/0619 ,  H04B7/0626 ,  H04B7/0669 ,  H04B7/0697 ,  H04B7/0837 ,  H04B7/0891 ,  H04B17/336 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0606 ,  H04L1/0625 ,  H04L1/0631 ,  H04L27/2626 ,  H04L27/2647 ,  H04W84/12

摘要： A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

摘要翻译： 公开了一种用于实现具有不等调制和编码方案（MCS）或流依赖MCS的空间处理的方法和装置。 输入数据可以被解析成多个数据流，并且对数据流执行空间处理以产生多个空间流。 独立地选择每个数据流的MCS。 空间流通过多个发射天线发射。 可以对空间时间块编码（STBC），空间频率块编码（SFBC），准正交Alamouti编码，时间反转空间时间块编码，线性空间处理和循环延迟分集（CDD）的技术中的至少一种进行 数据/空间流。 然后可以将天线映射矩阵应用于空间流。 空间流通过多个发射天线发射。 可以基于与数据流相关联的每个空间流的信噪比来确定每个数据流的MCS。

公开(公告)号：US20070206689A1

公开(公告)日：2007-09-06

申请号：US11680959

申请日：2007-03-01

申请人： Chang-Soo Koo ,  Eldad Zeira ,  I-Tai Lu ,  Robert Olesen ,  Kun-Ju Tsai

发明人： Chang-Soo Koo ,  Eldad Zeira ,  I-Tai Lu ,  Robert Olesen ,  Kun-Ju Tsai

IPC分类号： H04K1/10

CPC分类号： H04L25/0216 ,  H04L25/0208 ,  H04L25/0212 ,  H04L25/0214 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2647

摘要： In an orthogonal frequency division multiplexing (OFDM) system, a frequency domain channel estimate for non-nullified subcarriers is converted to a time domain channel estimate. The number of taps L of a channel model is determined based on the time domain channel estimate. An improved time domain channel estimate is obtained by computing L tap coefficients of the channel model from the frequency domain channel estimate. An improved frequency domain channel estimate is obtained by performing a Fourier transform on the improved time domain channel estimate. Alternatively, a time domain truncation method may be performed selectively only if the signal-to-noise ratio (SNR) is below a threshold. Alternatively, a frequency domain channel estimate for pilot subcarriers are converted to a time domain channel estimate and an improved frequency domain channel estimate is obtained based on the number of pilot subcarriers and a delay spread.

摘要翻译： 在正交频分复用（OFDM）系统中，对于非无效子载波的频域信道估计被转换为时域信道估计。 基于时域信道估计来确定信道模型的抽头数L。 通过从频域信道估计计算信道模型的L抽头系数来获得改进的时域信道估计。 通过对改进的时域信道估计执行傅里叶变换来获得改进的频域信道估计。 或者，只有当信噪比（SNR）低于阈值时，才可以选择性地执行时域截断方法。 或者，将导频子载波的频域信道估计转换为时域信道估计，并且基于导频子载波的数量和延迟扩展获得改进的频域信道估计。

公开(公告)号：US20060034244A1

公开(公告)日：2006-02-16

申请号：US11123738

申请日：2005-05-06

申请人： Yuejin Huang ,  Chang-Soo Koo ,  Robert Olesen ,  Guodong Zhang ,  Yingming Tsai

发明人： Yuejin Huang ,  Chang-Soo Koo ,  Robert Olesen ,  Guodong Zhang ,  Yingming Tsai

IPC分类号： H04L1/00

CPC分类号： H04L5/0044 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0016 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/006 ,  H04W52/42

摘要： A method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system are disclosed. The entire sub-channels are divided into a plurality of groups. A channel quality indicator (CQI) is generated for each group based on channel quality status in each group, and communication parameters are adjusted in accordance with the CQI.

摘要翻译： 公开了一种用于正交频分复用（OFDM）无线通信系统中的链路自适应的方法和系统。 整个子通道被分成多个组。 基于每组中的信道质量状态为每个组生成信道质量指示符（CQI），并且根据CQI调整通信参数。

公开(公告)号：US20070014376A1

公开(公告)日：2007-01-18

申请号：US11524225

申请日：2006-09-20

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

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

IPC分类号： H04L27/28

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：US20060056529A1

公开(公告)日：2006-03-16

申请号：US11222171

申请日：2005-09-08

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

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

IPC分类号： H04K1/10

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：US20060245513A1

公开(公告)日：2006-11-02

申请号：US11392025

申请日：2006-03-29

申请人： Chang-Soo Koo ,  Robert Olesen

发明人： Chang-Soo Koo ,  Robert Olesen

IPC分类号： H04B7/02

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. 产生Hermitian矩阵A = H H H或A = HH H H。 在矩阵A上循环地执行Jacobi过程以获得Q和D A A矩阵，使得A = Q D A A H H O。 D A A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矩阵和D矩阵矩阵计算H矩阵的U，V和D H H矩阵。 D H H是包括H矩阵的奇异值的对角矩阵。

公开(公告)号：US20070206504A1

公开(公告)日：2007-09-06

申请号：US11680694

申请日：2007-03-01

申请人： Chang-Soo Koo ,  Arty Chandra ,  Peter Voltz ,  Chia-Pang Yen ,  Jin Wang ,  Robert Olesen

发明人： Chang-Soo Koo ,  Arty Chandra ,  Peter Voltz ,  Chia-Pang Yen ,  Jin Wang ,  Robert Olesen

IPC分类号： H04L1/00

CPC分类号： H04L25/03343 ,  H04B7/0408 ,  H04B7/0626 ,  H04B7/0643 ,  H04B17/0085 ,  H04B17/21 ,  H04B17/24 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/0398 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03611 ,  H04L2025/03802

摘要： A method and apparatus for calibration and channel state feedback to support transmit beamforming in a multiple-input multiple-output (MIMO) system are disclosed. For radio frequency (RF) calibration, a first station (STA) sends a calibration request to a second STA, and the second STA sends a sounding packet to the first STA. The first STA receives the sounding packet, performs at least one channel measurement and performs calibration based on the channel measurement. For channel state feedback, the first STA sends a channel state feedback request to the second STA. The second STA sends a sounding packet to the first STA. The first STA receives the sounding packet and performs at least one channel measurement with the sounding packet. The first STA then calculates a steering matrix for transmit beamforming based on the channel measurement.

摘要翻译： 公开了一种用于校准和信道状态反馈以支持多输入多输出（MIMO）系统中的发射波束成形的方法和装置。 对于射频（RF）校准，第一站（STA）向第二STA发送校准请求，并且第二STA向第一STA发送探测分组。 第一STA接收探测包，执行至少一个信道测量，并根据信道测量进行校准。 对于信道状态反馈，第一STA向第二STA发送信道状态反馈请求。 第二STA向第一STA发送一个探测包。 第一STA接收探测分组，并用声音分组进行至少一个信道测量。 然后，第一STA基于信道测量来计算用于发射波束形成的导引矩阵。