公开(公告)号：US07929628B2

公开(公告)日：2011-04-19

申请号：US11900636

申请日：2007-09-11

Applicant: Hidetoshi Kawauchi ,  Masayuki Hattori

Inventor： Hidetoshi Kawauchi ,  Masayuki Hattori

IPC: H04L27/28

CPC classification number: H04L25/0234 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/025 ,  H04L25/03159 ,  H04L27/2647 ,  H04L2025/03414

Abstract: An OFDM receiver may include OFDM-signal receiving means for receiving an orthogonal frequency division multiplexing (OFDM) signal; channel-characteristic estimating means for estimating a channel characteristic using pilot signals in the OFDM signal received by the OFDM-signal receiving means; and transmission-distortion compensating means for applying, on the basis of the channel characteristic estimated by the channel-characteristic estimating means, processing for compensating for transmission distortion to the OFDM signal received by the OFDM-signal receiving means. The channel-characteristic estimating means may include plural kinds of time-direction-channel estimating means used for the estimation of a channel characteristic, and switching control means for switching these estimating means according to a state of a channel.

Abstract translation: OFDM接收机可以包括用于接收正交频分复用（OFDM）信号的OFDM信号接收装置; 信道特性估计装置，用于使用由OFDM信号接收装置接收的OFDM信号中的导频信号来估计信道特性; 以及发送失真补偿装置，用于根据由信道特性估计装置估计的信道特性，应用用于补偿由OFDM信号接收装置接收的OFDM信号的发送失真的处理。 信道特性估计装置可以包括用于估计信道特性的多种时间 - 方向信道估计装置，以及根据信道状态切换这些估计装置的切换控制装置。

公开(公告)号：US07912433B2

公开(公告)日：2011-03-22

申请号：US12750793

申请日：2010-03-31

Applicant: Karl Molnar ,  Jung-Fu Cheng ,  Stephen J. Grant ,  Leonid Krasny ,  Yi-Pin Eric Wang

Inventor： Karl Molnar ,  Jung-Fu Cheng ,  Stephen J. Grant ,  Leonid Krasny ,  Yi-Pin Eric Wang

IPC: H04B17/00

CPC classification number: H04L1/0019 ,  H04B2201/709727 ,  H04L1/0002 ,  H04L1/0026 ,  H04L1/20 ,  H04L25/0202 ,  H04L25/0222 ,  H04L27/2647

Abstract: A method and apparatus for generating channel quality information, such as may be used for transmit link adaptation, provide different operating modes, such as a first mode that may be used when propagation channel estimates are not reliable, and a second mode that may be used when the propagation channel estimates are reliable. In one or more embodiments, channel quality information is generated using receiver performance information that characterizes receiver performance in terms of a defined channel quality metric, e.g., supported data rates, for different values of receiver input signal quality over a range of propagation channel realizations. Channel quality information can be generated by selecting channel quality metrics according to receiver input signal quality and a desired probability of meeting a defined performance requirement over a range of propagation channel realizations, or by selecting channel quality metrics according to receiver input signal quality and particularized propagation channel realizations.

Abstract translation: 用于产生信道质量信息的方法和装置，例如可以用于发送链路自适应，提供不同的操作模式，例如当传播信道估计不可靠时可以使用的第一模式，以及可以使用的第二模式 当传播信道估计是可靠的。 在一个或多个实施例中，使用接收机性能信息来生成信道质量信息，所述接收机性能信息根据定义的信道质量度量（例如，支持的数据速率），在传播信道实现范围内针对接收机输入信号质量的不同值来表征接收机性能。 可以通过根据接收机输入信号质量选择信道质量度量并且在传播信道实现范围内满足定义的性能要求的期望概率，或者通过根据接收机输入信号质量和特定传播选择信道质量度量来生成信道质量信息 渠道实现。

公开(公告)号：US07899140B2

公开(公告)日：2011-03-01

申请号：US11957716

申请日：2007-12-17

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/06

CPC classification number: H04N21/2383 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0228 ,  H04N21/4263 ,  H04N21/4382

Abstract: A method for correlating scattered pilot locations in a sequence of OFDM symbols in a multi-carrier transmission system, and includes mapping pilot locations comprising pilot symbols having predetermined known values, wherein the pilot symbols are positioned among data subcarriers in time and frequency dimensions consisting of received pilot symbols and having a predetermined position pattern in the time and frequency dimensions, wherein the predetermined position pattern comprises a finite number of sub-position patterns each corresponding to positions of the pilot symbols; estimating a Doppler spread in a frequency spectrum between the transmitter and the receiver in the multi-carrier transmission system; estimating a channel length of a set of channel paths received at the receiver; and the receiver automatically selecting one of a plurality of predetermined methods of correlating the scattered pilot locations in the sequence of OFDM symbols based only on the estimating processes.

Abstract translation: 一种用于在多载波传输系统中的OFDM符号序列中的分散导频位置相关的方法，并且包括映射导频位置，包括具有预定已知值的导频符号，其中导频符号位于数据子载波中，时间和频率维度由 接收的导频符号并且在时间和频率维度上具有预定的位置模式，其中预定位置模式包括每个对应于导频符号的位置的有限数量的子位置模式; 估计多载波传输系统中的发射机和接收机之间的频谱中的多普勒扩展; 估计在接收机处接收的一组信道路径的信道长度; 并且接收机根据估计过程自动选择使OFDM符号序列中的分散导频位置相关的多个预定方法之一。

公开(公告)号：US20110044383A1

公开(公告)日：2011-02-24

申请号：US12933505

申请日：2009-03-25

Applicant: Kunifusa Maruyama ,  Masayuki Kimata

Inventor： Kunifusa Maruyama ,  Masayuki Kimata

IPC: H04L27/00 ,  H03K5/159

CPC classification number: H04B7/0845 ,  H04B17/327 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/03159 ,  H04L2025/03426

Abstract: A coherent bandwidth calculation unit (41) calculates a coherent bandwidth based on a channel response in the time domain obtained from reception signals (R1-RN) for each path between transmitting antennas and receiving antennas. A weight calculation control unit (42) determines target subcarriers of equalization weight calculation based on the coherent bandwidth. A weight calculation unit (31) calculates the equalization weight of each target subcarrier. A weight interpolation unit (43) performs interpolation processing using the equalization weights so as to obtain equalization weights for the subcarriers that have not undergone equalization weight calculation yet.

Abstract translation: 相干带宽计算单元（41）基于从发送天线和接收天线之间的每个路径的接收信号（R1-RN）获得的时域中的信道响应来计算相干带宽。 权重计算控制单元（42）基于相干带宽确定均衡权重计算的目标子载波。 权重计算单元（31）计算每个目标子载波的均衡权重。 加权内插单元（43）使用均衡权重进行内插处理，以获得尚未进行均衡权重计算的子载波的均衡权重。

公开(公告)号：US20110009064A1

公开(公告)日：2011-01-13

申请号：US12810500

申请日：2008-12-05

Applicant: Chiharu Yamazaki ,  Shigeru Kimura ,  Fangwei Tong

Inventor： Chiharu Yamazaki ,  Shigeru Kimura ,  Fangwei Tong

IPC: H04B15/00 ,  H04B7/00

CPC classification number: H04B7/0413 ,  H04L25/0222

Abstract: A wireless communication apparatus 100 according to the present invention is provided with a reception channel coefficient variation calculation unit 130-1, . . . for calculating a variation of a reception channel coefficient calculated by a reception channel coefficient calculation unit 120-1, . . . , a transmission channel coefficient calculation unit 140-1, . . . for calculating a transmission channel coefficient at transmission by extrapolation based on the variation of the reception channel coefficient, a correction coefficient memory unit 150-1 for storing a correction coefficient based on the variation of the reception channel coefficient at reception for correcting the transmission channel coefficient at transmission, and a correction unit 170-11, . . . for correcting the transmission channel coefficient at transmission calculated by the transmission channel coefficient calculation unit 140-1, . . . based on the correction coefficient stored in the correction coefficient memory unit 150-1.

Abstract translation: 根据本发明的无线通信设备100具有接收信道系数变化计算单元130-1，...。 。 。 用于计算由接收信道系数计算单元120-1计算的接收信道系数的变化。 。 。 ，传输信道系数计算单元140-1，...。 。 。 用于基于接收信道系数的变化来计算通过外推发送的传输信道系数;校正系数存储单元150-1，用于基于接收时的接收信道系数的变化来存储校正系数，以校正传输信道系数 在发送时，以及校正单元170-11。 。 。 用于校正由传输信道系数计算单元140-1计算的传输中的传输信道系数。 。 。 基于存储在校正系数存储单元150-1中的校正系数。

公开(公告)号：US20100303177A1

公开(公告)日：2010-12-02

申请号：US12801165

申请日：2010-05-26

Applicant: Kai-Jie Yang ,  Shin-Yuan Wang ,  Weily Kuo

Inventor： Kai-Jie Yang ,  Shin-Yuan Wang ,  Weily Kuo

IPC: H04L27/00

CPC classification number: H04L25/0202 ,  H04L25/0222

Abstract: A Doppler frequency estimation system includes a basis projector, a polynomial generator and an extreme value determinator. The basis projector receives and projects multiple channel sampling signals to a set of orthogonal bases to thereby generate multiple channel correlation vectors. The polynomial generator is connected to the basis projector in order to produce a target polynomial based on the channel correlation vectors, an estimated channel-envelope-to-noise-plus-interference power-ratio and a channel-envelope power. The extreme value determinator is connected to the polynomial generator in order to determine an extreme value of the polynomial and output a frequency corresponding to the extreme value as an estimated Doppler frequency.

Abstract translation: 多普勒频率估计系统包括基本投影仪，多项式发生器和极值确定器。 基准投影仪将多个通道采样信号接收并投影到一组正交基底，从而生成多个信道相关向量。 多项式发生器连接到基本投影仪，以便基于信道相关向量，估计的信道包络到噪声加干扰功率比和信道包络功率产生目标多项式。 极值确定器连接到多项式发生器，以便确定多项式的极值，并输出与极值对应的频率作为估计的多普勒频率。

公开(公告)号：US20100183064A1

公开(公告)日：2010-07-22

申请号：US12750793

申请日：2010-03-31

Applicant: Karl James Molnar ,  Jung-Fu Cheng ,  Stephen J. Grant ,  Leonid Krasny ,  Yi-Pin Eric Wang

Inventor： Karl James Molnar ,  Jung-Fu Cheng ,  Stephen J. Grant ,  Leonid Krasny ,  Yi-Pin Eric Wang

IPC: H04B17/00

CPC classification number: H04L1/0019 ,  H04B2201/709727 ,  H04L1/0002 ,  H04L1/0026 ,  H04L1/20 ,  H04L25/0202 ,  H04L25/0222 ,  H04L27/2647

Abstract: A method and apparatus for generating channel quality information, such as may be used for transmit link adaptation, provide different operating modes, such as a first mode that may be used when propagation channel estimates are not reliable, and a second mode that may be used when the propagation channel estimates are reliable. In one or more embodiments, channel quality information is generated using receiver performance information that characterizes receiver performance in terms of a defined channel quality metric, e.g., supported data rates, for different values of receiver input signal quality over a range of propagation channel realizations. Channel quality information can be generated by selecting channel quality metrics according to receiver input signal quality and a desired probability of meeting a defined performance requirement over a range of propagation channel realizations, or by selecting channel quality metrics according to receiver input signal quality and particularized propagation channel realizations.

Abstract translation: 用于产生信道质量信息的方法和装置，例如可以用于发送链路自适应，提供不同的操作模式，例如当传播信道估计不可靠时可以使用的第一模式，以及可以使用的第二模式 当传播信道估计是可靠的。 在一个或多个实施例中，使用接收机性能信息来生成信道质量信息，所述接收机性能信息根据定义的信道质量度量（例如，支持的数据速率），在传播信道实现范围内针对接收机输入信号质量的不同值来表征接收机性能。 可以通过根据接收机输入信号质量选择信道质量度量并且在传播信道实现范围内满足定义的性能要求的期望概率，或者通过根据接收机输入信号质量和特定传播选择信道质量度量来生成信道质量信息 渠道实现。

公开(公告)号：US07751353B2

公开(公告)日：2010-07-06

申请号：US11386879

申请日：2006-03-23

Applicant: Nir Shapira ,  Gilad Rozen

Inventor： Nir Shapira ,  Gilad Rozen

IPC: H04B7/00

CPC classification number: H04L63/1475 ,  H04K3/28 ,  H04K3/41 ,  H04K3/45 ,  H04K3/825 ,  H04K2203/18 ,  H04K2203/32 ,  H04K2203/34 ,  H04L25/0204 ,  H04L25/0222 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802 ,  H04W12/02 ,  H04W12/12

Abstract: Some demonstrative embodiments of the invention include methods, devices and/or systems to secure a wireless transmission. The method may include, for example, transmitting a noise transmission to be received by one or more destinations other than an intended destination of a packet during a time period corresponding to a duration of the packet. Other embodiments are described and claimed.

Abstract translation: 本发明的一些演示实施例包括用于确保无线传输的方法，设备和/或系统。 该方法可以包括例如在对应于分组的持续时间的时间段期间发送要由分组的预期目的地以外的一个或多个目的地接收的噪声传输。 描述和要求保护其他实施例。

公开(公告)号：US20100085865A1

公开(公告)日：2010-04-08

申请号：US12450836

申请日：2007-04-26

Applicant: Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

Inventor： Magnus Nilsbo ,  Tharaka Lamahewa ,  Scott Leyonhjelm

IPC: H04J11/00 ,  H04L12/26 ,  H04B1/707

CPC classification number: H04L25/022 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0222 ,  H04L25/0228 ,  H04L27/2647

Abstract: Low complex algorithms for estimating a delay spread or a RMS delay spread of a multipath channel using channel estimates are disclosed, leading to low overall power consumption. According to an embodiment of the present invention, a delay spread or a RMS delay spread of the multipath channel is determined based on a metric calculated as a function of channel estimates. In another embodiment, an average signal to noise ratio is taken into consideration in addition to the metric to estimate the delay spread or the RMS delay spread. In a further embodiment, the delay spread or the RMS delay spread of the multipath channel is estimated based on an average signal to noise ratio and on a metric being a function of the slope between subcarrier channel estimates. The present invention further relates to an apparatus for estimating a delay spread or a RMS delay spread of the multipath channel.

Abstract translation: 公开了用于使用信道估计来估计多径信道的延迟扩展或RMS延迟扩展的低复杂算法，导致低的总功耗。 根据本发明的实施例，基于作为信道估计的函数计算的度量来确定多路径信道的延迟扩展或RMS延迟扩展。 在另一个实施例中，除了用于估计延迟扩展或RMS延迟扩展的度量之外，考虑平均信噪比。 在另一个实施例中，基于平均信噪比和在子载波信道估计之间的斜率的函数的度量来估计多径信道的延迟扩展或RMS延迟扩展。 本发明还涉及用于估计多路径信道的延迟扩展或RMS延迟扩展的装置。

公开(公告)号：US20090274199A1

公开(公告)日：2009-11-05

申请号：US11794888

申请日：2006-01-05

Applicant: Takashi Onodera ,  Toshizo Nogami ,  Hidekazu Tsuboi

Inventor： Takashi Onodera ,  Toshizo Nogami ,  Hidekazu Tsuboi

IPC: H04L25/49 ,  H04B1/38

CPC classification number: H04L25/022 ,  H04L5/0007 ,  H04L5/0064 ,  H04L25/0222 ,  H04L27/0008

Abstract: [Object] To prevent communication performance capabilities from deteriorating even in the cases that the estimation error of the propagation path is significant, and that the variation speed of the propagation path characteristics is fast.[Overcoming Means] An adaptive modulation control apparatus which adaptively selects a modulation parameter from among a plurality of modulation parameters corresponding to an estimation result of a propagation path state and which has a frequency axis gradient calculating section (11) which receives propagation path estimation information indicative of an estimation result of a propagation path state, and calculates a gradient of a function of frequency corresponding to each frequency when the propagation path estimation information is set to be the function of frequency, a correcting section (12) that makes a correction to increase or decrease an upper limit or a lower limit of a numerical range of the propagation path state in one-to-one correspondence with each of the modulation parameters corresponding to the calculated gradient of the function of frequency, and a modulation parameter selecting section (13) that selects a modulation parameter corresponding to the corrected numerical range of the propagation path state including the propagation path estimation information.

Abstract translation: 即使在传播路径的估计误差大的情况下，传播路径特性的变动速度快的情况下，也能防止通信性能下降。 [克服装置]一种自适应调制控制装置，其自适应地从对应于传播路径状态的估计结果的多个调制参数中选择调制参数，并且具有频率轴梯度计算部分（11），其接收传播路径估计信息 指示传播路径状态的估计结果，并且当传播路径估计信息被设置为频率的函数时，计算对应于每个频率的频率的函数的梯度;校正部分（12），其对 与传播路径状态的数值范围的上限或下限一一对应地对应于与所计算的频率函数的梯度相对应的调制参数，增加或减少调制参数选择部（ 13），其选择对应于校正数字的调制参数 包括传播路径估计信息的传播路径状态的范围。