公开(公告)号：US20120183299A1

公开(公告)日：2012-07-19

申请号：US13005820

申请日：2011-01-13

申请人： Jun Zheng ,  Yi Wang ,  Chuan Peng

发明人： Jun Zheng ,  Yi Wang ,  Chuan Peng

IPC分类号： H03F1/26 ,  H04B10/00

CPC分类号： H04B10/58 ,  H04B10/2575

摘要： A distortion compensation circuit with frequency detection may be used with one or more non-linear elements, such as a laser, to compensate for frequency-dependent distortion generated by the non-linear element(s), for example, in broadband multichannel RF applications. Embodiments of the distortion compensation circuit may include a frequency detector circuit that detects changes in frequency loading conditions in the distortion compensation circuit such that distortion compensation may be adjusted to compensate for distortion under different frequency loading conditions. In a multichannel RF system with multiple channel operation modes, for example, the frequency detector circuit may detect changes in the frequency loading condition as a result of changing operation modes.

摘要翻译： 具有频率检测的失真补偿电路可以与一个或多个非线性元件（例如激光器）一起使用，以补偿例如在宽带多通道RF应用中由非线性元件产生的与频率相关的失真 。 失真补偿电路的实施例可以包括频率检测器电路，其检测失真补偿电路中的频率负载条件的变化，使得可以调整失真补偿以补偿在不同频率负载条件下的失真。 在具有多通道操作模式的多通道RF系统中，例如，频率检测器电路可以检测作为改变操作模式的结果的频率负载状态的变化。

公开(公告)号：US20120163832A1

公开(公告)日：2012-06-28

申请号：US12976136

申请日：2010-12-22

申请人： Jun Zheng ,  Yi Wang

发明人： Jun Zheng ,  Yi Wang

IPC分类号： H04B1/10 ,  H04B10/04

CPC分类号： H04B10/2575 ,  H04B10/58

摘要： A distortion compensation circuit including a configurable delay may be used with one or more non-linear elements, such as a laser, to compensate for distortion generated by the non-linear element(s), for example, in broadband RF applications. Embodiments of the distortion compensation circuit may include a primary signal path with a configurable delay segment and a secondary signal path including at least one distortion generator. The configurable delay segment may be selectively configured to provide different delay settings to accommodate different RF loading conditions such that the delayed RF signal on the primary signal path is aligned with the distortion products generated on the secondary signal path when combined to form an RF signal with distortion compensation.

摘要翻译： 包括可配置延迟的失真补偿电路可以与诸如激光器的一个或多个非线性元件一起使用，以补偿例如在宽带RF应用中由非线性元件产生的失真。 失真补偿电路的实施例可以包括具有可配置延迟段的主信号路径和包括至少一个失真发生器的辅助信号路径。 可配置延迟段可以被选择性地配置为提供不同的延迟设置以适应不同的RF负载条件，使得主信号路径上的延迟的RF信号与副信号路径上产生的失真乘积对准，以形成RF信号， 失真补偿。

公开(公告)号：US08165474B2

公开(公告)日：2012-04-24

申请号：US12053104

申请日：2008-03-21

申请人： Jun Zheng ,  Brian Ishaug

发明人： Jun Zheng ,  Brian Ishaug

IPC分类号： H04B10/00 ,  H04L12/26 ,  H04J14/02 ,  G06K7/10

CPC分类号： H04B10/58 ,  H04B10/25751

摘要： A modulated optical system with anti-clipping reduces or corrects clipping that might occur in the laser as a result of negative spikes or peaks in a multichannel RF signal. The system generally detects an envelope of the RF signal to generate an anti-clipping signal that follows at least a portion of the envelope and prevents one or more negative peaks from causing clipping by adjusting a bias current in response to the anti-clipping signal. The system may also reduce cross modulation by clamping the anti-clipping signal at an anti-clipping limit during lower power periods of the RF signal.

摘要翻译： 具有抗限幅的调制光学系统可减少或校正由于多通道RF信号中的负峰值或峰值而在激光器中可能发生的削波。 该系统通常检测RF信号的包络以产生跟随至少一部分包络线的抗限幅信号，并且通过响应于抗限幅信号调整偏置电流来防止一个或多个负峰值引起限幅。 该系统还可以在RF信号的较低功率周期期间通过将抗限幅信号钳位在抗限幅极限来减少交叉调制。

公开(公告)号：US20120082128A1

公开(公告)日：2012-04-05

申请号：US13313297

申请日：2011-12-07

申请人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul

发明人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul

IPC分类号： H04W72/04

CPC分类号： H04W24/10 ,  H04B17/24 ,  H04W72/0453

摘要： In transmit pre-coding, a bandwidth and a feedback period to one or more CQI reporting units and a bandwidth and a feedback period to one or more PMI reporting units are assigned, respectively. Sub-divisions in time and/or frequency corresponding to the assigned bandwidths and the assigned feedback periods are dynamically adjusted based at least on uplink channel state information corresponding to the bandwidth and the feedback period assigned to the CQI reporting units, and the bandwidth and the feedback period assigned to the PMI reporting units. One or more feedback messages are generated based at least on the channel state information over the adjusted sub-divisions in time and/or frequency corresponding to the CQI reporting units and to the PMI reporting units, respectively. The bandwidth and/or the feedback period may be assigned based on the channel state information or as a function of a feedback rate.

摘要翻译： 在发送预编码中，分配给一个或多个CQI报告单元的带宽和反馈周期以及到一个或多个PMI报告单元的带宽和反馈周期。 至少基于对应于分配给CQI报告单元的带宽和反馈周期的上行链路信道状态信息来动态地调整与分配的带宽和分配的反馈周期相对应的时间和/或频率的子部分，并且带宽和 反馈期分配给PMI报告单位。 至少基于经调整的子部分的信道状态信息，分别对应于CQI报告单元和对应于PMI报告单元的时间和/或频率生成一个或多个反馈消息。 可以基于信道状态信息或作为反馈速率的函数来分配带宽和/或反馈周期。

公开(公告)号：US20110194159A1

公开(公告)日：2011-08-11

申请号：US13123325

申请日：2009-10-01

申请人： Masazumi Hara ,  Hiroki Ishizuki ,  Hiroaki Takeuchi ,  Tatsuhiko Ochi ,  Shuichi Hirano ,  Jun Zheng

发明人： Masazumi Hara ,  Hiroki Ishizuki ,  Hiroaki Takeuchi ,  Tatsuhiko Ochi ,  Shuichi Hirano ,  Jun Zheng

IPC分类号： H04N1/04

CPC分类号： G01N21/85 ,  G01B11/024 ,  G01N2021/8592

摘要： A tray used to place granular materials on a reading surface of an image reading device has provided thereto a transparent bottom plate, a background vertically upstanding relative to the bottom plate, and reflective elements arranged at predetermined intervals parallel to the background. In order to enable an imaging means of the image reading device to receive a side view image of the granular materials in the thickness direction thereof with the granular materials placed on the bottom plate of the tray, the tray is provided with a technical means for bending and guiding, by the reflective elements, light from the granular materials in the thickness direction thereof to the direction of the optical axis of the imaging means.

摘要翻译： 用于将粒状材料放置在图像读取装置的读取表面上的托盘提供了透明底板，相对于底板垂直竖立的背景，以及以与背景平行的预定间隔布置的反射元件。 为了使得图像读取装置的成像装置能够在放置在托盘的底板上的颗粒材料上接收其厚度方向上的颗粒材料的侧视图，该托盘设置有用于弯曲的技术手段 并且通过反射元件将粒状材料的厚度方向的光引导到成像装置的光轴的方向。

公开(公告)号：US20110165846A1

公开(公告)日：2011-07-07

申请号：US12652150

申请日：2010-01-05

申请人： Jun Zheng ,  Mark Kent ,  Vinko Erceg

发明人： Jun Zheng ,  Mark Kent ,  Vinko Erceg

IPC分类号： H04B17/00

CPC分类号： H04B7/0626 ,  H04B7/0417 ,  H04L1/0026 ,  H04L1/003 ,  H04L25/0202

摘要： A mobile device estimates channel state information (CSI) comprising, for example, CQI and/or SNR, for a downlink channel. The estimated CSI is non-uniformly quantized and transmitted to the base station over a finite-rate feedback channel. Different portions of the estimated CSI are quantized using different quantization step sizes, which are determined according to a performance metric function such as a channel capacity function of the estimated CSI. A quantization step size for a portion of the estimated CSI is increased if a low distribution probability is indicated by the portion of the estimated CSI. A quantization step size for a portion of the estimated CSI is decreased if a high distribution probability is indicated. The mobile device quantizes the estimated CSI using the determined quantization step sizes to transmit to the base station over the finite-rate feedback channel. Downlink data transmission is received according to the transmitted CSI.

摘要翻译： 移动设备针对下行链路信道估计包括例如CQI和/或SNR的信道状态信息（CSI）。 估计的CSI被不均匀地量化，并通过有限速率反馈信道发送到基站。 使用不同的量化步长量化估计的CSI的不同部分，这些量化步长根据诸如估计的CSI的信道容量函数的性能度量功能来确定。 如果估计的CSI的部分指示低分布概率，则估计的CSI的一部分的量化步长增加。 如果指示高分配概率，则估计CSI的一部分的量化步长减小。 移动设备使用确定的量化步长量化估计的CSI，以便通过有限速率反馈信道向基站发送。 根据发送的CSI接收下行链路数据传输。

公开(公告)号：US20110164557A1

公开(公告)日：2011-07-07

申请号：US12732975

申请日：2010-03-26

申请人： Sirikiat Lek Ariyavisitakul ,  Jun Zheng

发明人： Sirikiat Lek Ariyavisitakul ,  Jun Zheng

IPC分类号： H04W4/00

CPC分类号： H04L25/0204 ,  H04L1/005 ,  H04L5/0005 ,  H04L25/0206 ,  H04L25/024 ,  H04L25/0242 ,  H04L2025/03611 ,  H04W24/00 ,  H04W84/12

摘要： A method and system for iterative discrete Fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques are presented. Aspects of the method and system include a procedure for computing channel estimates in both the time domain and frequency domain (or mixed domain) using an iterative DFT method based on MMSE techniques. One aspect of the method and system may achieve low computational complexity and produce more accurate channel estimate values in low signal to noise ratio (SNR) regimes in comparison to conventional DFT-based channel estimation methods, which utilize least squares (LS) techniques. The method and system disclosed herein may be practiced in connection with a wide range of orthogonal frequency division multiplexing (OFDM) based systems, for example wireless local area networks (WLAN, for example IEEE 802.11 WLAN systems), and LTE systems.

摘要翻译： 提出了使用最小均方误差（MMSE）技术的基于迭代离散傅里叶变换（DFT）的信道估计的方法和系统。 该方法和系统的方面包括使用基于MMSE技术的迭代DFT方法计算时域和频域（或混合域）中的信道估计的过程。 与使用最小二乘（LS）技术的传统的基于DFT的信道估计方法相比，该方法和系统的一个方面可以实现低计算复杂度并且在低信噪比（SNR）方案中产生更准确的信道估计值。 本文公开的方法和系统可以结合宽范围的基于正交频分复用（OFDM）的系统，例如无线局域网（WLAN，例如IEEE 802.11 WLAN系统）和LTE系统来实施。

公开(公告)号：US20110164510A1

公开(公告)日：2011-07-07

申请号：US12652124

申请日：2010-01-05

申请人： Jun Zheng ,  Mark Kent ,  Vinko Erceg

发明人： Jun Zheng ,  Mark Kent ,  Vinko Erceg

IPC分类号： H04B15/00 ,  H04L12/26 ,  H04W4/00

CPC分类号： H04B7/0626 ,  H04W72/0406 ,  H04W72/08 ,  H04W72/121

摘要： A mobile device estimates channel status information (CSI) for an associated single user downlink multiple-input multiple-output (MIMO) channel. The estimated CSI is quantized using a finite quantization resolution. The quantized CSI is communicated to the base station over a finite-rate feedback channel. Intended downlink data transmission is scheduled by the base station according to the transmitted CSI, and received by the mobile device, accordingly. The estimated CSI comprise generalized channel quality information such as channel capacity and channel direction. The base station selects a first user having a strongest channel capacity according to quantized CSI received from associated mobile devices. Beams orthogonal to a single user downlink MIMO channel of the selected first user are broadcasted. Quantized relative channel direction matrices and projected channel capacity are received from remaining mobile devices. A user having a strongest projected channel capacity is selected a second user for the user group.

摘要翻译： 移动设备估计用于相关联的单用户下行链路多输入多输出（MIMO）信道的信道状态信息（CSI）。 使用有限量化分辨率对估计的CSI进行量化。 量化的CSI通过有限速率反馈信道传送到基站。 相应地，预定的下行链路数据传输由基站根据发送的CSI调度并由移动设备接收。 估计的CSI包括广播信道质量信息，例如信道容量和信道方向。 基站根据从相关联的移动设备接收到的量化CSI来选择具有最强信道容量的第一用户。 广播与所选择的第一用户的单个用户下行链路MIMO信道正交的光束。 从剩余的移动设备接收量化的相对信道方向矩阵和投影信道容量。 为用户组选择具有最强投影通道容量的用户的第二用户。

公开(公告)号：US07953138B2

公开(公告)日：2011-05-31

申请号：US12910485

申请日：2010-10-22

申请人： Mark Kent ,  Vinko Erceg ,  Jun Zheng

发明人： Mark Kent ,  Vinko Erceg ,  Jun Zheng

IPC分类号： H04L27/30

CPC分类号： H04L5/143 ,  H04B7/0417 ,  H04B7/0639 ,  H04L25/0204 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03808

摘要： A method and system for processing communication signals is provided and may comprise, quantizing a channel estimate at a MIMO receiver onto a codebook based on a cost function, wherein the codebook comprises a plurality of unitary matrices. A codebook index may be fed back from the MIMO receiver to a MIMO transmitter, wherein the codebook index is associated with one of the plurality of unitary matrices that minimizes the cost function. The cost function may be minimized by choosing a smallest scalar cost from a plurality of scalar costs, wherein each one of the scalar costs is generated from one or more sums and one or more products of elements of a product matrix, and wherein the product matrix is generated from one of the plurality of unitary matrices, a matrix comprising the channel estimate, and their respective Hermitian Transposes.

摘要翻译： 提供了一种用于处理通信信号的方法和系统，并且可以包括：基于成本函数将MIMO接收机处的信道估计量化到码本上，其中码本包括多个酉矩阵。 码本索引可以从MIMO接收机反馈到MIMO发射机，其中，码本索引与使成本函数最小化的多个酉矩阵中的一个相关联。 可以通过从多个标量成本中选择最小标量成本来最小化成本函数，其中每个标量成本是从产品矩阵的一个或多个和的乘积和一个或多个乘积的乘积产生的，并且其中产品矩阵 从多个酉矩阵中的一个生成矩阵，包括信道估计的矩阵以及它们各自的厄米转移。

公开(公告)号：US20110103505A1

公开(公告)日：2011-05-05

申请号：US12917841

申请日：2010-11-02

申请人： Jun Zheng ,  Chengjin Zhang ,  Pieter van Rooyen

发明人： Jun Zheng ,  Chengjin Zhang ,  Pieter van Rooyen

IPC分类号： H04L27/28

CPC分类号： H04B7/0452 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0643 ,  H04W52/42

摘要： A method for processing signals in a communication system includes selecting, from a plurality of users, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. At least a second user may be selected from a portion of the remaining portion of the plurality of users, based on a feedback channel gain of the second user. The selected second user may have a channel direction that is approximately orthogonal to a channel direction of the first user. System capacity may be determined based on the selecting of the first user and the selecting of the second user. The channel gain may be defined by a quantized channel gain. A quantized channel direction of the selected first user may be determined for the selecting of the second user.

摘要翻译： 一种用于在通信系统中处理信号的方法包括从多个用户中选择具有大于与所述多个用户的剩余部分相对应的信道增益的信道增益的第一用户。 可以基于第二用户的反馈信道增益从多个用户的剩余部分的一部分中选择至少第二用户。 所选择的第二用户可以具有与第一用户的频道方向近似正交的频道方向。 可以基于第一用户的选择和第二用户的选择来确定系统容量。 信道增益可以由量化的信道增益来定义。 可以确定所选择的第一用户的量化信道方向用于选择第二用户。