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：US06775322B1

公开(公告)日：2004-08-10

申请号：US09638718

申请日：2000-08-14

Applicant: Kambiz C. Zangi ,  Raymond Toy ,  Dennis Hui

Inventor： Kambiz C. Zangi ,  Raymond Toy ,  Dennis Hui

IPC: H03H730

CPC classification number: H04L25/03057 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04L2025/03605

Abstract: A computationally efficient method for computing the filter coefficients for a prefilter in a decision feedback equalizer solves linear equations using a fast Toeplitz algorithm. Computations performed to compute the filter coefficients for the right half burst may be used to compute the prefilter for the left hand burst, thereby reducing the number of computations. Also, a square root-free algorithm may be used to solve the system of linear equations, further reducing computational complexity.

Abstract translation: 在计算效率高的方法中，用于在判决反馈均衡器中计算预滤波器的滤波器系数，使用快速Toeplitz算法求解线性方程。 用于计算右半脉冲串的滤波器系数的计算可用于计算左手脉冲串的前置滤波器，从而减少计算次数。 此外，可以使用无平方根算法来解决线性方程组，进一步降低计算复杂度。

公开(公告)号：US06608862B1

公开(公告)日：2003-08-19

申请号：US09378314

申请日：1999-08-20

Applicant: Kambiz C. Zangi ,  Dennis Hui

Inventor： Kambiz C. Zangi ,  Dennis Hui

IPC: H03H730

CPC classification number: H04L25/03261 ,  H04L25/03235

Abstract: The impulse response of a prefilter used with a DFSE equalizer in a receiver system is computed. A channel estimate is determined in response to signals received by the receiver system. The channel estimate may include a forward channel estimate and a backward channel estimate. Roots of a z-transform of the forward channel estimate and roots of a z-transform of the backward channel estimate are determined. Those roots of the z-transform of the forward channel estimate having a magnitude greater than one are used to form a z-transform of a forward impulse response of the prefilter while those roots of the z-transform of the backward channel estimate having a magnitude greater than one are used to form a z-transform of a backward impulse response of the prefilter. Forward prefilter coefficients for the prefilter are computed based on the z-transform of the forward impulse response of the prefilter and backward prefilter coefficients for the prefilter are computed based on the z-transform of the backward impulse response of the prefilter. A forward impulse response of a forward composite channel are computed based on the forward prefilter coefficients while a backward impulse response of a backward composite channel are computed based on the backward prefilter coefficients.

Abstract translation: 计算在接收机系统中与DFSE均衡器一起使用的预滤波器的脉冲响应。 响应于由接收机系统接收的信号确定信道估计。 信道估计可以包括前向信道估计和反向信道估计。 确定前向信道估计的z变换的根和反向信道估计的z变换的根。 使用具有大于1的幅度的正向信道估计的z变换的这些根用于形成预滤波器的正向脉冲响应的z变换，而反向信道估计的z变换的那些根具有幅度 大于一个用于形成预过滤器的反向脉冲响应的z变换。 基于前置滤波器的反向脉冲响应的z变换来计算基于预滤波器的前置滤波器的前向脉冲响应的z变换和用于预滤波器的反向预滤波器系数的前置滤波器系数。 基于前向前置滤波器系数计算正向复合信道的正向脉冲响应，而基于反向预滤波器系数计算反向复合信道的反向脉冲响应。

公开(公告)号：US20090069054A1

公开(公告)日：2009-03-12

申请号：US11850781

申请日：2007-09-06

Applicant: Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

Inventor： Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

IPC: H04M1/00

CPC classification number: H04L5/0082 ,  H04L1/0015 ,  H04L5/0023 ,  H04L5/0058 ,  H04L25/03343 ,  H04W4/08 ,  H04W28/18 ,  H04W72/00

Abstract: According to one or more method and apparatus embodiments taught herein, network base stations reduce temporal variations in the interference perceived by mobile stations operating within the network by slowing down the rate at which they change or otherwise update the linear precoding settings applied to their transmitted Orthogonal Frequency Division Multiplex (OFDM) signals in comparison to the rate at which the base stations perform link adaptation. That is, the precoding-related component of measured interference (e.g., other-cell interference) at the mobile stations is made quasi-stationary with respect to channel quality reporting and link adaptation intervals by fixing the preceding settings used by each base station over time intervals substantially longer than the channel reporting/link adaptation intervals.

Abstract translation: 根据本文教导的一个或多个方法和装置实施例，网络基站通过减慢其改变的速率或以其他方式更新应用于其发送的正交的线性预编码设置的速率来减少在网络内操作的移动站感知到的干扰的时间变化 频分复用（OFDM）信号与基站执行链路自适应的速率相比较。 也就是说，通过固定每个基站随时间推移的先前设置，相对于信道质量报告和链路自适应间隔，将移动站处的测量干扰（例如，其他小区干扰）的预编码相关分量制成准静止 间隔显着长于信道报告/链路自适应间隔。

公开(公告)号：US06674820B1

公开(公告)日：2004-01-06

申请号：US09504216

申请日：2000-02-15

Applicant: Dennis Hui ,  Kambiz C. Zangi ,  Rajarem Ramesh

Inventor： Dennis Hui ,  Kambiz C. Zangi ,  Rajarem Ramesh

IPC: H03D104

CPC classification number: H04L25/03993 ,  H04L25/0224 ,  H04L25/025

Abstract: Methods, systems and receiver devices are provided which may provide improved receiver performance in obtaining estimates of the complex-valued baseband channel in the presence of colored baseband noise. In various embodiments of the present invention, systems and methods are provided in which, over each synchronization signal period or other determinate information window, the channel coefficients and the color of the baseband noise are concurrently estimated. Thus, both the channel coefficients and the color of the noise are estimated, rather than assuming white noise, and channel coefficients may be provided that account for the color of the noise These estimates may be provided for each burst of a communication and may result in an improved channel estimate in the presence of colored noise. The baseband noise can become colored due to, for example, having a non-Nyquist receive filter, due to the presence of a colored co-channel interferer, or due to the presence of an adjacent channel interferer. The concurrent estimates of the color of the noise and channel coefficients may be provided iteratively or by selection of a best result among a plurality of candidate noise color assumptions.

Abstract translation: 提供了方法，系统和接收机设备，其可以在有色基带噪声的存在下提供改进的接收机性能来获得复值基带信道的估计。 在本发明的各种实施例中，提供了系统和方法，其中通过每个同步信号周期或其他确定信息窗口，同时估计信道系数和基带噪声的颜色。 因此，估计信道系数和噪声的颜色，而不是假设白噪声，并且可以提供考虑噪声颜色的信道系数。可以为通信的每个突发提供这些估计，并且可以导致 在存在彩色噪声的情况下改进的信道估计。 由于存在着色的同频道干扰源，或者由于相邻信道干扰源的存在，由于例如具有非奈奎斯特接收滤波器，基带噪声可能变色。 可以迭代地提供噪声和信道系数的颜色的并发估计，或者通过在多个候选噪声颜色假设中选择最佳结果来提供。

公开(公告)号：US08036099B2

公开(公告)日：2011-10-11

申请号：US11850781

申请日：2007-09-06

Applicant: Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

Inventor： Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

IPC: H04L27/28 ,  H04B7/02 ,  H04Q7/00

CPC classification number: H04L5/0082 ,  H04L1/0015 ,  H04L5/0023 ,  H04L5/0058 ,  H04L25/03343 ,  H04W4/08 ,  H04W28/18 ,  H04W72/00

Abstract: According to one or more method and apparatus embodiments taught herein, network base stations reduce temporal variations in the interference perceived by mobile stations operating within the network by slowing down the rate at which they change or otherwise update the linear precoding settings applied to their transmitted Orthogonal Frequency Division Multiplex (OFDM) signals in comparison to the rate at which the base stations perform link adaptation. That is, the precoding-related component of measured interference (e.g., other-cell interference) at the mobile stations is made quasi-stationary with respect to channel quality reporting and link adaptation intervals by fixing the preceding settings used by each base station over time intervals substantially longer than the channel reporting/link adaptation intervals.

Abstract translation: 根据本文教导的一个或多个方法和装置实施例，网络基站通过减慢其改变的速率或以其他方式更新应用于其发送的正交的线性预编码设置的速率来减少在网络内操作的移动站感知到的干扰的时间变化 频分复用（OFDM）信号与基站执行链路自适应的速率相比较。 也就是说，通过固定每个基站随时间推移的先前设置，相对于信道质量报告和链路自适应间隔，将移动站处的测量干扰（例如，其他小区干扰）的预编码相关分量制成准静止 间隔显着长于信道报告/链路自适应间隔。

公开(公告)号：US06707849B1

公开(公告)日：2004-03-16

申请号：US09499977

申请日：2000-02-08

Applicant: Kambiz C. Zangi ,  Rajaram Ramesh ,  Dennis Hui ,  Jung-Fu Cheng

Inventor： Kambiz C. Zangi ,  Rajaram Ramesh ,  Dennis Hui ,  Jung-Fu Cheng

IPC: H04L2503

CPC classification number: H04L25/03197 ,  H04L25/03235 ,  H04L2025/03401

Abstract: Metrics associated with each branch from a previous hypothesized trellis state to each respective possible current trellis state in a DFSE equalizer can be calculated. In particular, a common portion of branch metrics can be calculated that is common to each of the branch metrics from the previous hypothesized state to each of the current possible states, and difference variables representing a difference between the common portion of the branch metrics and each of the branch metrics from the previous hypothesized state to each of the current possible states can also be calculated. The common portion of the branch metrics and each of the difference variables can then be combined to provide a respective metric for each of the possible current states.

Abstract translation: 可以计算与DFSE均衡器中的每个分支相关联的从先前假设网格状态到每个可能的当前格状态的度量。 特别地，可以计算公共部分的分支度量，其对于从先前假设状态到每个当前可能状态的每个分支度量是共同的，并且差异变量表示分支度量的公共部分与每个 也可以计算从先前假设状态到当前可能状态的分支度量。 然后可以组合分支度量和每个差异变量的公共部分以为每个可能的当前状态提供相应的度量。

公开(公告)号：US06590932B1

公开(公告)日：2003-07-08

申请号：US09450684

申请日：1999-11-24

Applicant: Dennis Hui ,  Kambiz C. Zangi ,  Rajaram Ramesh

Inventor： Dennis Hui ,  Kambiz C. Zangi ,  Rajaram Ramesh

IPC: H03H1704

CPC classification number: H04L25/03993 ,  H04L25/03299

Abstract: Methods, systems and receiver devices are provided which may reduce the average power of a signal disturbance by whitening the signal disturbance. In one aspect, a finite impulse response filter (FIR) is provided which whitens the signal disturbance by filtering a downsampled received signal using filter coefficients adaptively established using known signal information in each signal burst of the received signal. Alternatively, a noise-whitening equalizer is utilized having a modified metric that whitens the signal disturbance again using coefficients adaptively established using known signal information in each signal burst of the received signal. The noise-whitening equalizer approach further allows the noise-whitening coefficients to be updated by treating symbol estimates from the equalizer as known signal information to generate updated noise-whitening coefficients. A novel receiver containing a modified Euclidean metric equalizer to provide noise-whitening is also provided.

Abstract translation: 提供了方法，系统和接收机设备，其可以通过白化信号干扰来降低信号干扰的平均功率。 在一个方面，提供了一种有限脉冲响应滤波器（FIR），其通过使用在接收信号的每个信号脉冲串中已知信号信号自适应地建立的滤波器系数对下采样的接收信号进行滤波来对信号干扰进行白化。 或者，使用噪声增白均衡器，其具有修改的度量，该修正度量再次使用在接收信号的每个信号脉冲串中使用已知信号信号自适应地建立的信号来增白信号干扰。 噪声增白均衡器方法还允许通过从均衡器处理符号估计作为已知信号信息来更新噪声白化系数，以产生更新的噪声增白系数。 还提供了一种包含改进的欧几里德度量均衡器以提供噪声增白的新型接收器。

公开(公告)号：US09036684B2

公开(公告)日：2015-05-19

申请号：US13247597

申请日：2011-09-28

Applicant: Dennis Hui ,  Kumar Balachandran ,  Jung-Fu Cheng ,  Jiann-Ching Guey

Inventor： Dennis Hui ,  Kumar Balachandran ,  Jung-Fu Cheng ,  Jiann-Ching Guey

IPC: H04B1/38 ,  H04B7/04 ,  H04B7/06 ,  H04L25/02 ,  H04L5/00 ,  H04L25/03

CPC classification number: H04B7/0413 ,  H04B7/0615 ,  H04B7/0686 ,  H04L5/0023 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0226 ,  H04L2025/03426

Abstract: Compressive sampling is used to generate pilot symbols to be transmitted over an array of antennas in a MIMO wireless communications device. A pilot symbol is transmitted over the array of antennas according to a spatially randomized antenna transmission function that randomly changes across the array of antennas. The randomized antenna transmission function may randomly select/deselect antennas and/or randomly change amplitude and/or phase of the pilot symbol transmission. Channel estimates can be constructed at a receiver based on the spatially randomized pilot symbols that were transmitted.

Abstract translation: 压缩采样用于生成将在MIMO无线通信设备中通过天线阵列传输的导频符号。 根据在天线阵列上随机变化的空间随机天线传输功能，在天线阵列上传输导频符号。 随机天线发送功能可以随机地选择/取消选择天线和/或随机地改变导频符号传输的幅度和/或相位。 可以基于发送的空间随机化导频符号在接收机处构造信道估计。

公开(公告)号：US08947993B2

公开(公告)日：2015-02-03

申请号：US13556818

申请日：2012-07-24

Applicant: Chester Park ,  Dennis Hui

Inventor： Chester Park ,  Dennis Hui

IPC: H04L27/26

CPC classification number: H04L27/2627 ,  H04L27/2631

Abstract: Methods may be provided to transmit data from a wireless terminal operating in a radio access network. For example, sampling rate conversion may be performed on a serial stream of modulation symbols to generate sampling rate converted symbols, and the sampling rate converted symbols may be transmitted over a wireless channel to a node of the radio access network. Related terminals are also discussed.

Abstract translation: 可以提供方法来从在无线电接入网络中操作的无线终端发送数据。 例如，可以对串行调制符号流执行采样率转换以产生采样率转换的符号，并且可以通过无线信道将采样率转换的符号发送到无线电接入网络的节点。 还讨论了相关终端。