公开(公告)号：US07978788B2

公开(公告)日：2011-07-12

申请号：US11993605

申请日：2005-07-01

Applicant: Dennis Hui ,  Rajaram Ramesh

Inventor： Dennis Hui ,  Rajaram Ramesh

IPC: H04L25/06

CPC classification number: H04L25/063 ,  H04L25/061

Abstract: A method and arrangement for estimating a DC offset for a signal received in a radio receiver. The received signal includes a digitally modulated signal component, a DC offset component, and a noise component. When the signal is of a known type, such as a Gaussian Minimum Shift Keying (GMSK)-modulated signal with constant amplitude in a GSM/EDGE cellular radio system, the method exploits the known characteristics of the statistical distribution for the known type of signal to obtain a better estimate of the DC offset. The statistical distribution of the received digitally modulated signal component is first analyzed. That statistical distribution is then compared to the known statistical distribution for the known type of signal to identify differences. The differences are then used to estimate the DC offset. Additional iterations may be performed to further improve the DC estimate.

Abstract translation: 一种用于估计在无线电接收机中接收的信号的DC偏移的方法和装置。 接收到的信号包括数字调制信号分量，DC偏移分量和噪声分量。 当信号是GSM / EDGE蜂窝无线电系统中具有恒定振幅的已知类型的高斯最小移频键控（GMSK）调制信号时，该方法利用了已知类型信号的已知统计分布特征 以获得对DC偏移的更好的估计。 首先分析接收到的数字调制信号分量的统计分布。 然后将统计分布与已知的信号类型的统计分布进行比较以识别差异。 然后使用差异来估计DC偏移。 可以执行另外的迭代以进一步改善DC估计。

公开(公告)号：US20100248666A1

公开(公告)日：2010-09-30

申请号：US11993522

申请日：2005-06-28

Applicant: Dennis Hui ,  Abdulrauf Hafeez

Inventor： Dennis Hui ,  Abdulrauf Hafeez

IPC: H04B1/16

CPC classification number: H04L25/0212 ,  H04L25/0224

Abstract: A device and method in a radio receiver for generating synchronization and channel estimation information based on three parameters consisting of a synchronization position, at least one whitening filter parameter, and a channel estimate. A spatially and temporally stacked signal model is generated by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors. Initial estimates of a first one or two of the three parameters are then generated based on the spatially and temporally stacked signal model. The rest of the three parameters are then computed based on the initial estimates of the first one or two parameters. If a stopping criterion is met, the method ends and the parameters are used to process the signal. If the stopping criterion is not met, additional iterations are performed to improve the synchronization and estimation information.

Abstract translation: 一种无线电接收机中的装置和方法，用于基于由同步位置，至少一个白化滤波器参数和信道估计组成的三个参数来产生同步和信道估计信息。 通过堆叠时间上相邻的接收信号向量和对应的训练向量的连续采样来生成空间和时间叠加的信号模型。 然后基于空间和时间叠加的信号模型来生成三个参数中的第一个或两个的初始估计。 然后根据第一个或两个参数的初始估计值计算三个参数的其余部分。 如果满足停止标准，则该方法结束，参数用于处理信号。 如果不满足停止标准，则执行附加迭代以改善同步和估计信息。

公开(公告)号：US20100167679A1

公开(公告)日：2010-07-01

申请号：US12601568

申请日：2007-05-28

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

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

IPC: H04B1/10

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：US20100054322A1

公开(公告)日：2010-03-04

申请号：US12204217

申请日：2008-09-04

Applicant: Dennis Hui ,  Kambiz Zangi

Inventor： Dennis Hui ,  Kambiz Zangi

IPC: H04L27/01 ,  H04L27/06 ,  H04B1/10

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：US20090262843A1

公开(公告)日：2009-10-22

申请号：US12105313

申请日：2008-04-18

Applicant: Leonid Krasny ,  Dennis Hui

Inventor： Leonid Krasny ,  Dennis Hui

IPC: H04L27/28

CPC classification number: H04L25/03343 ,  H04B7/0619 ,  H04B7/0626 ,  H04B7/066 ,  H04L25/0242 ,  H04L2025/03426 ,  H04L2025/03802

Abstract: Pre-coder techniques disclosed herein are based on long-term statistical channel information for reducing channel feedback overhead and transmitter complexity. In an embodiment, a receiver includes two or more receive antennas spaced approximately λ/2 apart and a baseband processor. The baseband processor computes channel correlations for different combinations of transmit antennas and each receive antenna and averages the channel correlations over the different receive antennas to form a frequency-independent channel correlation matrix. The baseband processor also computes a scalar representing noise variance at the receive antennas and feeds back the frequency-independent channel correlation matrix and the scalar for use in performing transmitter pre-coding computations.

Abstract translation: 本文公开的预编码技术基于用于减少信道反馈开销和发射机复杂度的长期统计信道信息。 在一个实施例中，接收机包括两个或更多个间隔大约λ/ 2的接收天线和基带处理器。 基带处理器为发射天线和每个接收天线的不同组合计算信道相关性，并对不同接收天线之间的信道相关进行平均，以形成与频率无关的信道相关矩阵。 基带处理器还计算表示在接收天线处的噪声方差的标量，并反馈与频率无关的信道相关矩阵和标量，以用于执行发射机预编码计算。

公开(公告)号：US20080310523A1

公开(公告)日：2008-12-18

申请号：US11763192

申请日：2007-06-14

Applicant: Dennis Hui ,  Leonid Krasny

Inventor： Dennis Hui ,  Leonid Krasny

IPC: H04L7/02

CPC classification number: H04B7/0417 ,  H04B7/0426 ,  H04B7/0626 ,  H04L1/0675 ,  H04L25/0206 ,  H04L27/2601

Abstract: Multi-antenna transmission control presented herein involves generating a set of virtual channel realizations at the transmitter that shares the same second-order statistics as the actual channel realizations observed for a targeted receiver. By making the control-related quantities of interest at the transmitter depend on the long-term statistics of the channel, the actual channel realizations are not needed for transmission control, e.g., for accurate Multiple-Input-Multiple-Output (MIMO) preceding. As such, the use of virtual channel realizations enables transmission control that approaches the “closed-loop” channel capacity that would be provided by full feedback of the (instantaneous) actual channel realizations, without requiring the overhead signaling burden that attends full feedback.

Abstract translation: 本文提出的多天线传输控制涉及在发射机处生成一组虚拟信道实现，其共享与针对目标接收机观察到的实际信道实现相同的二阶统计。 通过使发射机处的控制相关数量取决于信道的长期统计，例如对于精确的多输入多输出（MIMO）预编码，传输控制不需要实际的信道实现。 因此，虚拟信道实现的使用使得接近将通过（瞬时）实际信道实现的完全反馈提供的“闭环”信道容量的传输控制，而不需要出现完全反馈的开销信令负担。

公开(公告)号：US07388935B2

公开(公告)日：2008-06-17

申请号：US10868091

申请日：2004-06-15

Applicant: Dennis Hui

Inventor： Dennis Hui

IPC: H03D1/00

CPC classification number: H04L25/0244

Abstract: A method of computing an inversion (X) of a nearly Toeplitz n by n matrix (A). A perturbation matrix (E) is first determined such that the sum of the nearly Toeplitz matrix (A) and the perturbation matrix (E) is a Toeplitz matrix (T). The inversion is solved by solving the equation X=T−1(B+EX), where B is a vector or matrix of dimension n by m. An initial estimate X(0) is selected and estimates of the inversion X are iteratively computed through the recursion X(n−1)=T−1(B+EX(n)). The initial estimate X(0) may be equal to an inversion (T−1) of the Toeplitz matrix (T). The present invention may be utilized in a radio receiver to efficiently compute (1) a least-squares (LS) channel estimate, (2) minimum mean squared error (MMSE) prefilter coefficients for a decision feedback equalizer (DFE), or (3) an autoregressive (AR) noise-spectrum estimation from a finite number of observed noise samples.

Abstract translation: 用n矩阵（A）计算几乎Toeplitz n的反演（X）的方法。 首先确定扰动矩阵（E），使得几乎Toeplitz矩阵（A）和扰动矩阵（E）之和为Toeplitz矩阵（T）。 通过求解方程X = T ^{-1（B + EX）来求解反演，其中B是维数n乘以m的向量或矩阵。 选择初始估计X 0（0），并且通过递归X 0（n-1）进行迭代计算反演X的估计。 SUP>（B + EX（n））。 初始估计X 0（0）可以等于Toeplitz矩阵（T）的反演（T -1）。 本发明可以用于无线电接收机中以有效地计算（1）最小二乘（LS）信道估计，（2）用于判决反馈均衡器（DFE）的最小均方误差（MMSE）预滤波器系数，或（3 ）从有限数量的观察到的噪声样本估计自回归（AR）噪声谱。}

公开(公告)号：US20070259671A1

公开(公告)日：2007-11-08

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: H04Q7/20

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：US20050254600A1

公开(公告)日：2005-11-17

申请号：US10844155

申请日：2004-05-12

Applicant: Dayong Chen ,  Dennis Hui

Inventor： Dayong Chen ,  Dennis Hui

IPC: H04L27/00 ,  H04L27/22

CPC classification number: H04L27/0012

Abstract: A method and apparatus blindly detects a received signal's modulation type characterizing an impairment component of the received signal for each postulated modulation type by determining spatial correlations between In-phase and Quadrature components of the received signal. The blind detection circuit then detects the modulation type based on the characterized impairment component. A metric generator generates a postulation metric for each postulated modulation type based on the characterized impairment component. After evaluating the postulation metrics, an evaluation circuit identifies the postulated modulation type having the best postulation metric as the modulation type of the received signal. According to an exemplary embodiment, the blind detection circuit determines a whitened noise estimate for each postulated modulation type and generates the postulation metrics based on the whitened noise estimate to reduce interference effects in the postulation metrics.

Abstract translation: 一种方法和装置通过确定接收信号的同相和正交分量之间的空间相关性，盲目检测每个假设调制类型表征接收信号的损伤分量的接收信号的调制类型。 然后，盲检测电路基于所表征的损伤分量检测调制类型。 度量发生器基于特征的损伤分量为每个假设的调制类型生成假设度量。 在评估假设度量之后，评估电路将具有最佳假设度量的假定调制类型识别为接收信号的调制类型。 根据示例性实施例，盲检测电路确定每个假设调制类型的白化噪声估计，并且基于白化噪声估计生成假设度量，以减少假设度量中的干扰影响。

公开(公告)号：US06725024B1

公开(公告)日：2004-04-20

申请号：US09706744

申请日：2000-11-07

Applicant: Bengt Lindoff ,  Dennis Hui ,  Kambiz Casey Zangi

Inventor： Bengt Lindoff ,  Dennis Hui ,  Kambiz Casey Zangi

IPC: H04B106

CPC classification number: H04L25/0202 ,  H04L25/062

Abstract: A method and apparatus for offsetting the frequency of a local oscillator in a receiver are disclosed. The local oscillator frequency is offset with an offset frequency that depends on the training sequence used. Training symbols are inputted to the control unit. The control unit then provides an offset frequency depending on the training symbol received. A rotation of the baseband signal, proportional to the offset frequency, is introduced which later is digitally compensated for. Upon reception of the signal, a DC offset is introduced in the radio part. The digital compensation transforms this DC offset, in the baseband signal, to a rotating signal. The rotating DC offset signal is then subtracted in the baseband processing.

Abstract translation: 公开了一种用于抵消接收机中的本地振荡器的频率的方法和装置。 本地振荡器频率偏移，取决于所使用的训练序列的偏移频率。 训练符号被输入到控制单元。 然后，控制单元根据所接收的训练符号提供偏移频率。 引入与偏移频率成比例的基带信号的旋转，其随后被数字补偿。 在接收到信号时，在无线电部分中引入DC偏移。 数字补偿将基带信号中的该直流偏移转换为旋转信号。 然后在基带处理中减去旋转的DC偏移信号。