公开(公告)号：US08369383B2

公开(公告)日：2013-02-05

申请号：US12581943

申请日：2009-10-20

申请人： Douglas A. Cairns ,  Elias Jonsson ,  Göran Bergman

发明人： Douglas A. Cairns ,  Elias Jonsson ,  Göran Bergman

IPC分类号： H04B1/707

CPC分类号： H04B1/712 ,  H04B1/7113 ,  H04B1/7117

摘要： A method and apparatus provide for setting processing delay assignments in a CDMA receiver using a flat-channel placement or using a dispersive channel placement, in dependence on characterizing the channel as flat or dispersive. For example, a receiver maintains a logical flag reliably indicating the current channel state as flat or dispersive, and assigns or otherwise sets processing delays—e.g., for received signal demodulation—using a flat-channel placement algorithm or a dispersive-channel placement algorithm. The “flat-channel” placement algorithm generally provides better performance in flat-channel environments, and the “dispersive-channel” placement algorithm generally provides better performance in dispersive channel environments. Such processing may be regarded as “activating” a simplified processing delay placement grid that offers better performance if the channel truly is flat, with the underlying advantage of providing a reliable mechanism for detecting flat channel conditions.

摘要翻译： 一种方法和装置提供用于使用平面信道放置或使用色散信道放置来设置CDMA接收机中的处理延迟分配，这取决于将信道表示为平坦或分散。 例如，接收器将逻辑标志可靠地指示当前信道状态为平坦或分散，并且分配或以其他方式设置处理延迟，例如，对于接收信号解调，使用平坦信道布局算法或色散通道布局算法。 平面通道布局算法通常在平坦通道环境中提供更好的性能，并且色散通道布局算法通常在色散通道环境中提供更好的性能。 这种处理可以被认为是激活简化的处理延迟布置网格，如果信道真的是平坦的，则提供更好的性能，其基本优点是提供用于检测平坦信道条件的可靠机制。

公开(公告)号：US08295328B2

公开(公告)日：2012-10-23

申请号：US11548528

申请日：2006-10-11

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： A control system and method for controlling a spread spectrum receiver such as a generalized Rake (G-Rake) receiver or chip equalizer based on a frequency shift (fD) of a received signal. A hybrid channel estimator outputs a low-rate channel estimate such as a slot average channel estimate if fD is less than or equal to a threshold value. If fD is greater than the threshold, a plurality of high-rate channel estimates such as interpolated channel estimates is produced. An impairment covariance matrix estimates correlations between impairment on different fingers of the G-Rake receiver. The update rate of the matrix is controlled dependent on the value of fD. A combining weights calculator then calculates sets of combining weights based on the channel estimates and the impairment correlation estimates.

摘要翻译： 一种用于基于接收信号的频移（fD）控制诸如广义Rake（G-Rake）接收机或码片均衡器的扩频接收机的控制系统和方法。 如果f D小于或等于阈值，则混合信道估计器输出低速率信道估计，例如时隙平均信道估计。 如果fD大于阈值，则产生诸如内插信道估计之类的多个高速率信道估计。 损伤协方差矩阵估计G-Rake接收器不同手指的损伤之间的相关性。 基于fD的值来控制矩阵的更新速率。 组合权重计算器然后基于信道估计和损害相关估计来计算组合权重集合。

公开(公告)号：US08175630B2

公开(公告)日：2012-05-08

申请号：US12500856

申请日：2009-07-10

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B7/00

CPC分类号： H04W52/286 ,  H04B17/364 ,  H04W52/12 ,  H04W52/146 ,  H04W52/241 ,  H04W52/243 ,  H04W52/343 ,  H04W52/54 ,  H04W52/58

摘要： A method and apparatus for controlling the transmit power of a mobile device in a mobile communication network takes the level of self-interference into account to perform inner-loop power control. For normal inner-loop power control, a signal quality estimate is compared to a signal quality target and power control commands are generated based on the comparison. When self-interference is the dominant impairment in the received signal, a “fast break” is introduced to change inner-loop power control command generation. The amount of self-interference is determined based on the delay spread of the channel.

摘要翻译： 用于控制移动通信网络中的移动设备的发射功率的方法和装置考虑自干扰水平以执行内环功率控制。 对于正常的内环功率控制，将信号质量估计与信号质量目标进行比较，并且基于比较生成功率控制命令。 当自干扰是接收信号的主要损害时，引入“快断”来改变内环功率控制命令的产生。 基于信道的延迟扩展来确定自干扰量。

公开(公告)号：US08041325B2

公开(公告)日：2011-10-18

申请号：US12107623

申请日：2008-04-22

申请人： Elias Jonsson ,  Douglas A. Cairns ,  Kazuyoshi Uesaka ,  Hiroaki Watabe

发明人： Elias Jonsson ,  Douglas A. Cairns ,  Kazuyoshi Uesaka ,  Hiroaki Watabe

IPC分类号： H04B1/10

CPC分类号： H04B1/712 ,  H04B1/7097 ,  H04B2201/709727

摘要： A mobile receiver having a multi-mode interference suppression function and a way to estimate its speed utilizes a parametric approach to interference suppression at high speeds, and a nonparametric approach at low speeds. In particular, if the mobile receiver is currently operating in a nonparametric mode and its speed exceeds a first predetermined threshold, the mobile receiver switches to a parametric mode. Conversely, if the mobile receiver is currently in parametric mode and its speed is less than a second predetermined threshold, the mobile receiver switches to nonparametric mode. In one embodiment, the speed may be estimated by a Doppler frequency in the received signal, and the thresholds are Doppler frequencies. In one embodiment, the first and second thresholds are different, creating a hysteresis in the mode switching.

摘要翻译： 具有多模式干扰抑制功能的移动接收机和估计其速度的方法利用高速干扰抑制的参数化方法和低速度的非参数方法。 特别地，如果移动接收机当前正在以非参数模式操作并且其速度超过第一预定阈值，则移动接收机切换到参数模式。 相反，如果移动接收机当前处于参数模式并且其速度小于第二预定阈值，则移动接收机切换到非参数模式。 在一个实施例中，可以通过接收信号中的多普勒频率来估计速度，并且阈值是多普勒频率。 在一个实施例中，第一和第二阈值是不同的，在模式切换中产生迟滞。

公开(公告)号：US20110206167A1

公开(公告)日：2011-08-25

申请号：US12709239

申请日：2010-02-19

申请人： Anders Rosenqvist ,  Douglas A. Cairns ,  Andres Reial

发明人： Anders Rosenqvist ,  Douglas A. Cairns ,  Andres Reial

IPC分类号： H04B1/10

CPC分类号： H04L25/0226 ,  H04L25/0238

摘要： A signal-to-interference estimate is generated using unknown data symbols in place of or in addition to pilot symbols. Data received over a data channel (traffic channel or control channel) are collected. The data symbols are then used to compute an observation metric based on deviations of the data symbols from a predetermined set of possible data symbols, wherein one of the data symbols and symbol constellation is normalized. A data channel signal-to-interference ratio is then computed based on the observation metric.

摘要翻译： 使用未知数据符号代替导频符号或除导频符号之外，生成信号到干扰估计。 通过数据通道（业务信道或控制信道）接收的数据被收集。 然后，数据符号用于基于来自预定的一组可能的数据符号的数据符号的偏差来计算观测度量，其中数据符号和符号星座之一被归一化。 然后基于观测度量计算数据信道信号干扰比。

公开(公告)号：US07929629B2

公开(公告)日：2011-04-19

申请号：US12027492

申请日：2008-02-07

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04K1/10 ,  H04B1/713

CPC分类号： H04L25/0246 ,  H04B1/71052 ,  H04B1/712 ,  H04B2201/70701 ,  H04B2201/709727 ,  H04L25/0224

摘要： Teachings presented herein present a “whitening” channel estimation method and apparatus that produce high-quality net channel estimates for processing a received signal, such as a received CDMA signal. Processing includes forming an initial least squares problem (for medium channel estimates) using known pilot values and corresponding pilot observations for the received signal, transforming the initial least squares problem using a whitening transformation term, and solving the transformed least squares problem to obtain whitened medium channel estimates. The whitening transformation term may be determined, for example, by carrying out a Cholesky factorization of a (traffic) data correlation matrix, which can be obtained from traffic data values for the received signal. Processing further includes converting the whitened medium channel estimates into whitened net channel estimates, which consider the effects of transmit/receive filtering.

摘要翻译： 本文提出的教导提供了一种“白化”信道估计方法和装置，其产生用于处理诸如接收的CDMA信号的接收信号的高质量净信道估计。 处理包括使用已知导频值和接收信号的相应导频观测形成初始最小二乘问题（对于中等信道估计），使用白化变换项变换初始最小二乘问题，并求解变换最小二乘问题以获得白化介质 渠道估计。 白化变换项可以例如通过执行可以从接收信号的业务数据值获得的（业务）数据相关矩阵的Cholesky分解来确定。 处理进一步包括将白化的介质信道估计转换为白化净信道估计，其考虑发射/接收滤波的影响。

公开(公告)号：US07590167B2

公开(公告)日：2009-09-15

申请号：US11215584

申请日：2005-08-30

申请人： Tracy L. Fulghum ,  Douglas A. Cairns

发明人： Tracy L. Fulghum ,  Douglas A. Cairns

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： A wireless communication device includes a Generalized RAKE (G-RAKE) receiver circuit that is configured to determine a traffic-to-pilot gain scaling parameter as part of the impairment correlation determination process that underlies (G-RAKE) combining weight generation. In this manner, the receiver circuit conveniently and accurately accounts for gain differences between the pilot channel of a received CDMA signal, as used for channel estimation, and the traffic channel(s) of the CDMA signal, which carry received data to be recovered. The gain difference accounting enables proper demodulation of amplitude-modulated traffic signals. By way of non-limiting example, such gain scaling may be used for demodulating/decoding High Speed Downlink Packet Access (HSDPA) signals used in Wideband Code Division Multiple Access (W-CDMA) systems.

摘要翻译： 无线通信设备包括广义RAKE（G-RAKE）接收器电路，其被配置为确定作为组合权重生成（G-RAKE）的基础的损害相关确定过程的一部分的业务到引导增益缩放参数。 以这种方式，接收机电路方便且准确地考虑了用于信道估计的接收的CDMA信号的导频信道与携带接收的要恢复的数据的CDMA信号的业务信道之间的增益差。 增益差计算能够对幅度调制的交通信号进行适当的解调。 作为非限制性示例，这种增益缩放可以用于解调/解码在宽带码分多址（W-CDMA）系统中使用的高速下行链路分组接入（HSDPA）信号。

公开(公告)号：US20090213909A1

公开(公告)日：2009-08-27

申请号：US12036368

申请日：2008-02-25

申请人： Stephen J. Grant ,  Douglas A. Cairns

发明人： Stephen J. Grant ,  Douglas A. Cairns

IPC分类号： H04B1/707 ,  H04B17/00

CPC分类号： H04B7/0426 ,  H04B1/712 ,  H04B2201/709727

摘要： Methods and apparatus for estimating code-reuse interference associated with a received multi-stream multiple-input multiple-output (MIMO) signal are disclosed. An estimate for the data-to-pilot power ratio, ΓD/P, may be obtained as a by-product of parametric estimation of impairment covariance associated with the received MIMO signal. In an exemplary method, a parametric impairment model is constructed for a received MIMO signal, the parametric model omitting code-reuse interference. Impairment covariance is measured, using, in one or more embodiments, received pilot symbol data. The parametric impairment model is fitted to the measured impairment covariance to obtain one or more scaling parameter values. A per-code energy value for a first data stream is then calculated from the one or more scaling parameter values. In some embodiments, the data-to-pilot power ratio for the received signal is first calculated from the one or more scaling parameters, and the per-code energy value calculated from the data-to-pilot power ratio.

摘要翻译： 公开了用于估计与接收的多流多输入多输出（MIMO）信号相关联的代码重用干扰的方法和装置。 可以获得数据导频功率比GammaD / P的估计，作为与接收的MIMO信号相关联的损害协方差的参数估计的副产品。 在示例性方法中，为接收的MIMO信号构建参数化损伤模型，该参数模型省略了码重用干扰。 在一个或多个实施例中，使用接收的导频符号数据来测量损伤协方差。 参数化损伤模型适用于测量的损害协方差，以获得一个或多个缩放参数值。 然后从一个或多个缩放参数值计算第一数据流的每码能量值。 在一些实施例中，首先从一个或多个缩放参数和从数据导频功率比计算出的每码能量值来计算接收信号的数据导频功率比。