公开(公告)号：US08000413B2

公开(公告)日：2011-08-16

申请号：US11841264

申请日：2007-08-20

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04L27/06

CPC分类号： H04B7/0854 ,  H04B1/7107 ,  H04B1/712 ,  H04B2201/709727 ,  H04L1/0002 ,  H04L1/20

摘要： Signal quality estimation and demodulation are tailored to the received signal quality. According to one embodiment, a received signal is processed by determining a first set of combining weights based on a first impairment covariance estimate derived assuming a low signal quality environment. A second set of combining weights is determined based on a second impairment covariance estimate derived assuming a high signal quality environment. A metric is determined corresponding to the difference between symbol estimates derived from the second set of combining weights and hard symbol decisions. The received signal is demodulated based on the second set of combining weights if the metric satisfies a threshold indicating high signal quality and otherwise based on the first set of combining weights.

摘要翻译： 信号质量估计和解调是针对接收到的信号质量量身定制的。 根据一个实施例，通过基于假设低信号质量环境导出的第一损害协方差估计来确定第一组合权重来处理接收信号。 基于假设高信号质量环境导出的第二损害协方差估计来确定第二组组合权重。 对应于从第二组合权重和硬符号决定导出的符号估计之间的差确定度量。 如果度量满足指示高信号质量的阈值，或者否则基于第一组合权重，则基于第二组合合权重解调接收信号。

公开(公告)号：US07983353B2

公开(公告)日：2011-07-19

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： H04B7/02 ,  H04L1/02

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＆Ggr; D / P的估计，作为与接收的MIMO信号相关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。

公开(公告)号：US20110142101A1

公开(公告)日：2011-06-16

申请号：US12637838

申请日：2009-12-15

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B1/707

CPC分类号： H04B1/707 ,  H04B2201/70701

摘要： A CDMA receiver computes an accurate estimate of the data to pilot power ratio. First, a biased estimate of the data to pilot power ratio is obtained from the data channel. A multiplicative correction factor is then computed from the pilot channel, and applied to the biased data to pilot power ratio estimate.

摘要翻译： CDMA接收机计算出数据对导频功率比的准确估计。 首先，从数据信道获得数据对导频功率比的有偏估计。 然后从导频信道计算乘法校正因子，并将其应用于偏置数据到导频功率比估计。

公开(公告)号：US20110007793A1

公开(公告)日：2011-01-13

申请号：US12500891

申请日：2009-07-10

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

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

IPC分类号： H04L27/01

CPC分类号： H04L25/03261 ,  H04L25/03235

摘要： Channel estimation and/or equalization processing is performed in a wireless receiver in two stages. The first stage involves pre-filtering in the frequency domain to compact a grid-based representation of the net channel. The second stage involves implementing reduced-complexity time domain channel estimation and/or equalization. According to one embodiment, a received signal transmitted over a net channel is processed by pre-filtering the received signal in the frequency domain. The frequency domain pre-filtering compacts an N-tap effective grid-based representation of the net channel into a K-tap compacted grid-based representation of the net channel where K

摘要翻译： 信道估计和/或均衡处理在两个阶段中在无线接收机中执行。 第一阶段涉及在频域中进行预滤波以压缩网络通道的基于网格的表示。 第二阶段涉及实现降低复杂度的时域信道估计和/或均衡。 根据一个实施例，通过净频道发送的接收信号通过对频域中的接收信号进行预滤波来处理。 频域预滤波将网络通道的N抽头有效网格表示压缩为K

公开(公告)号：US20100172396A1

公开(公告)日：2010-07-08

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 ,  H04L27/00

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”放置算法通常在平坦通道环境中提供更好的性能，“色散通道”放置算法通常在色散通道环境中提供更好的性能。 这样的处理可以被认为是“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：US20080089395A1

公开(公告)日：2008-04-17

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 (ƒD) of a received signal. A hybrid channel estimator outputs a low-rate channel estimate such as a slot average channel estimate if ƒD is less than or equal to a threshold value. If ƒD 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 ƒD. A combining weights calculator then calculates sets of combining weights based on the channel estimates and the impairment correlation estimates.

摘要翻译： 一种控制系统和方法，用于基于接收信号的频移（f SUB）来控制诸如广义Rake（G-Rake）接收机或码片均衡器的扩频接收机。 混合信道估计器输出低速率信道估计，如时隙平均信道估计，如果f 小于或等于阈值。 如果f 大于阈值，则产生多个高速率信道估计，例如内插信道估计。 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。 矩阵的更新速率由f 的值来控制。 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：US06452524B1

公开(公告)日：2002-09-17

申请号：US09779234

申请日：2001-02-08

申请人： Stephen Fraleigh ,  Douglas A. Cairns

发明人： Stephen Fraleigh ,  Douglas A. Cairns

IPC分类号： H03M300

CPC分类号： H03M7/3015

摘要： A delta-sigma converter including a multiplier. The delta-sigma converter includes a feed-forward path and a feedback path providing a feedback signal. The converter output signal is multiplied in the feedback path by a mapping function, and the multiplied signal is mapped to a digital feedback signal having the same number of bits as the input signal. There is also provided a digital-to-analog converter including a delta-sigma converter consistent with the invention, and a method of multiplying a digital signal.

摘要翻译： 包括乘法器的Δ-Σ转换器。 Δ-Σ转换器包括前馈路径和提供反馈信号的反馈路径。 转换器输出信号通过映射函数在反馈路径中相乘，并且相乘的信号被映射到具有与输入信号相同的位数的数字反馈信号。 还提供了包括与本发明一致的Δ-Σ转换器的数模转换器以及一种将数字信号相乘的方法。

公开(公告)号：US08605771B2

公开(公告)日：2013-12-10

申请号：US12637838

申请日：2009-12-15

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B1/69 ,  H04B1/713

CPC分类号： H04B1/707 ,  H04B2201/70701

摘要： A CDMA receiver computes an accurate estimate of the data to pilot power ratio. First, a biased estimate of the data to pilot power ratio is obtained from the data channel. A multiplicative correction factor is then computed from the pilot channel, and applied to the biased data to pilot power ratio estimate.

摘要翻译： CDMA接收机计算出数据对导频功率比的准确估计。 首先，从数据信道获得数据对导频功率比的有偏估计。 然后从导频信道计算乘法校正因子，并将其应用于偏置数据到导频功率比估计。

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。