公开(公告)号：US06216107B1

公开(公告)日：2001-04-10

申请号：US09174207

申请日：1998-10-16

申请人： Nils Rydbeck ,  R. David Koilpillai ,  Ali S. Khayrallah ,  Tracy Fulghum

发明人： Nils Rydbeck ,  R. David Koilpillai ,  Ali S. Khayrallah ,  Tracy Fulghum

IPC分类号： G10L1900

CPC分类号： H04L1/0059 ,  H04L1/007 ,  H04L1/08 ,  H04L2025/03566

摘要： In a transmitter for transmitting communication signals across a radio channel, an improved encoder includes a half-rate encoder receiving a digitized speech signal and generating a compressed bit stream at half-rate, and a signal expander receiving the compressed bit stream and generating an expanded bit stream at full-rate for transmission across a radio channel. An improved receiver, receives the transmitted communication signal which is selected from the group consisting of (a) a conventional full-rate encoded digitized speech signal, and (b) a half-rate encoded digitized speech signal including the expanded bit stream. The improved receiver includes a full-rate equalizer, a half-rate equalizer, and a switch initially routing the received digitized speech signal to the full-rate equalizer, wherein the full-rate equalizer demodulates the received digitized speech signal producing a full-rate demodulated signal and dibits of soft information corresponding to the full-rate demodulated signal. An analyzer analyzes the dibits of soft information and controls the switch to route the received digitized speech signal to one of the full-rate and half-rate equalizers based upon the analysis.

公开(公告)号：US20100111239A1

公开(公告)日：2010-05-06

申请号：US12263712

申请日：2008-11-03

申请人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy Fulghum

发明人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy Fulghum

IPC分类号： H04B1/10

CPC分类号： H04B1/7107 ,  H04B1/7105

摘要： A parallel interference cancellation (PIC) receiver incrementally removes interference from signals in parallel modules in successive stages. For each desired signal, as interfering signals are removed, corresponding updates to a data covariance matrix are modeled as computationally tractable rank-one updates to a root matrix of the covariance matrix. Processing of signals and/or covariance information may be initiated, continued, and/or halted at various stages, e.g., in response to signal or data quality. The PIC receiver using root matrix updates is applicable to a variety of demodulation techniques.

摘要翻译： 并行干扰消除（PIC）接收器逐渐地消除了连续级并行模块中信号的干扰。 对于每个期望的信号，随着干扰信号被去除，对数据协方差矩阵的相应更新被建模为协方差矩阵的根矩阵的计算上易于处理的一级更新。 信号和/或协方差信息的处理可以在各个阶段（例如响应信号或数据质量）被启动，继续和/或停止。 使用根矩阵更新的PIC接收器适用于各种解调技术。

公开(公告)号：US08432952B2

公开(公告)日：2013-04-30

申请号：US10720492

申请日：2003-11-24

申请人： Tracy Fulghum ,  Gregory Edward Bottomley ,  Yi-Pin Eric Wang ,  Ali S. Khayrallah

发明人： Tracy Fulghum ,  Gregory Edward Bottomley ,  Yi-Pin Eric Wang ,  Ali S. Khayrallah

IPC分类号： H04B1/707

CPC分类号： H04B1/7107 ,  H04B1/712 ,  H04B2201/709727 ,  H04J13/0048

摘要： Interference, such as inter-symbol interference, from a symbol of interest in a RAKE receiver is reduced. The RAKE receiver comprises a plurality of RAKE fingers, a processor, and a combiner. The plurality of RAKE fingers despread symbols received over multiple paths of a multi-path channel. The processor determines cross-correlations between symbol waveforms from different symbols and multiple paths. The combiner combines the despread symbols using the cross-correlations to reduce interference from the symbol of interest.

摘要翻译： 来自RAKE接收机中感兴趣的符号的干扰，诸如符号间干扰，减少了。 RAKE接收机包括多个RAKE指，处理器和组合器。 多个RAKE手指解扩在多路径信道的多个路径上接收的符号。 处理器确定来自不同符号和多个路径的符号波形之间的互相关。 组合器使用互相关组合解扩符号，以减少来自感兴趣符号的干扰。

公开(公告)号：US08270453B2

公开(公告)日：2012-09-18

申请号：US12263712

申请日：2008-11-03

申请人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy Fulghum

发明人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy Fulghum

IPC分类号： H04B1/00

CPC分类号： H04B1/7107 ,  H04B1/7105

摘要： A parallel interference cancellation (PIC) receiver incrementally removes interference from signals in parallel modules in successive stages. For each desired signal, as interfering signals are removed, corresponding updates to a data covariance matrix are modeled as computationally tractable rank-one updates to a root matrix of the covariance matrix. Processing of signals and/or covariance information may be initiated, continued, and/or halted at various stages, e.g., in response to signal or data quality. The PIC receiver using root matrix updates is applicable to a variety of demodulation techniques.

摘要翻译： 并行干扰消除（PIC）接收器逐渐地消除了连续级并行模块中信号的干扰。 对于每个期望的信号，随着干扰信号被去除，对数据协方差矩阵的相应更新被建模为协方差矩阵的根矩阵的计算上易于处理的一级更新。 信号和/或协方差信息的处理可以在各个阶段（例如响应信号或数据质量）被启动，继续和/或停止。 使用根矩阵更新的PIC接收器适用于各种解调技术。

公开(公告)号：US06320919B1

公开(公告)日：2001-11-20

申请号：US09201623

申请日：1998-11-30

申请人： Ali S. Khayrallah ,  Tracy Fulghum

发明人： Ali S. Khayrallah ,  Tracy Fulghum

IPC分类号： H04B710

CPC分类号： H04L1/06 ,  H04B7/0845 ,  H04L25/0236

摘要： Methods and systems are provided for channel tracking utilizing multi-pass demodulation in which, during the second pass, decoded symbols are treated as known symbols which are used to calculate the error term used in updating the propagation characterization during the second pass. This allows a higher bandwidth to be used for updating the propagation characterization while known symbols are being processed. In particular, the propagation characterization may be provided by a channel tracker or a multi-antenna receiver, such as an interference rejection/combining (IRC) system, with an impairment correlation matrix estimator or a combination of both. Accordingly, the spatial diversity characteristics of the received signal (from IRC) and the temporal (or timing) characteristics (from the channel tracker) may both be tracked at different bandwidths for decoded and undecoded symbols to allow improved performance under fast changing channel conditions while maintaining desired performance characteristics while processing undecoded symbols.

摘要翻译： 提供了用于使用多遍解调的信道跟踪的方法和系统，其中在第二遍期间，解码符号被视为已知符号，其用于计算在第二遍期间更新传播表征时使用的误差项。 这允许在正在处理已知符号时使用更高的带宽来更新传播表征。 特别地，传播特性可以由信道跟踪器或诸如干扰抑制/组合（IRC）系统的多天线接收机与损害相关矩阵估计器或两者的组合来提供。 因此，接收信号（来自IRC）和时间（或定时）特性（来自信道跟踪器）的空间分集特性可以在解码和未解码符号的不同带宽下被跟踪，以允许在快速变化的信道条件下提高性能， 在处理未解码的符号时保持期望的性能特征。

公开(公告)号：US20050201447A1

公开(公告)日：2005-09-15

申请号：US10800167

申请日：2004-03-12

申请人： Douglas Cairns ,  Gregory Bottomley ,  Yi-Pin Wang ,  Tracy Fulghum ,  Elias Jonsson

发明人： Douglas Cairns ,  Gregory Bottomley ,  Yi-Pin Wang ,  Tracy Fulghum ,  Elias Jonsson

IPC分类号： H04B1/707

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： Exemplary received signal processing may be based on maintaining a model of received signal impairment correlations, wherein each term of the model is updated periodically or as needed based on measuring impairments for a received signal of interest. An exemplary model comprises an interference impairment term scaled by a first model fitting parameter, and a noise impairment term scaled by a second model fitting parameters. The model terms may be maintained based on current channel estimates and delay information and may be fitted to measured impairment by adapting the model fitting parameters based on the measured impairment. The modeled received signal impairment correlations may be used to compute RAKE combining weights for received signal processing, or to compute Signal-to-Interference (SIR) estimates. Combined or separate models may be used for multiple received signals. As such, the exemplary modeling is extended to soft handoff, multiple antennas, and other diversity situations.

摘要翻译： 示例性的接收信号处理可以基于维持接收信号损害相关的模型，其中基于感兴趣的接收信号的测量损伤，模型的每个项被周期性地或根据需要更新。 示例性模型包括由第一模型拟合参数缩放的干扰损害项和由第二模型拟合参数缩放的噪声损伤项。 模型条款可以根据当前的渠道估计和延迟信息进行维护，并且可以通过根据测量的损失调整模型拟合参数来适应测量的损益。 建模的接收信号损害相关可用于计算接收信号处理的RAKE组合权重，或用于计算信号与干扰（SIR）估计。 组合或分离的模型可用于多个接收信号。 因此，示例性建模被扩展到软切换，多个天线和其他分集情况。

公开(公告)号：US20070047629A1

公开(公告)日：2007-03-01

申请号：US11215638

申请日：2005-08-30

申请人： Tracy Fulghum

发明人： Tracy Fulghum

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： A method of processing a received communication signal comprises calculating a traffic-to-pilot scaling factor by relating data correlations determined from despread traffic values obtained from the received communication signal-to-noise correlations determined from despread pilot values obtained from the received communication signal, and generating traffic symbol estimates by combining corresponding ones of the despread traffic values using combining weights calculated from the data correlations. Generating combining weights in this manner provides, among other things, Minimum Mean Square Error (MMSE) estimations for the received traffic symbols that inherently are properly scaled in amplitude relative to symbol values in a reference modulation constellation. By obtaining proper scaling as part of combining weight generation, the receiver need not make an explicit estimate of symbol power to obtain proper soft value information, and the estimated traffic symbols may be compared directly with the reference constellation.

摘要翻译： 一种处理接收到的通信信号的方法包括：通过将由从接收到的通信信号获得的解扩导频值确定的接收到的通信信噪比相关中获得的去扩展业务值确定的数据相关性相关联来计算业务对导频缩放因子， 以及通过使用从所述数据相关性计算的组合权重组合对应的所述去扩展业务值来生成业务符号估计。 以这种方式生成组合权重尤其提供了对于参考调制星座中相对于符号值固有地适当缩放幅度的接收业务符号的最小均方误差（MMSE）估计。 通过获得适当的缩放作为组合权重生成的一部分，接收机不需要对符号功率做出明确的估计以获得适当的软值信息，并且估计的业务符号可以直接与参考星座进行比较。

公开(公告)号：US20050271123A1

公开(公告)日：2005-12-08

申请号：US10858787

申请日：2004-06-02

申请人： Tracy Fulghum

发明人： Tracy Fulghum

IPC分类号： H04B7/08 ,  H04B1/707

CPC分类号： H04B7/0891 ,  H04B7/0848

摘要： A method and apparatus for a multi-branch wireless receiver for periodically sampling first and second received signals corresponding to first and second receiver branches at first and second sample times to generate offset sample streams. The offset sample streams are then combined in a combining circuit to reduce interference present in the received signals. In an exemplary embodiment, a multi-branch wireless receiver includes an offset circuit to generate first and second offset sample times. A first sampler periodically samples the first received signal at the first sample time to generate a first sample stream and a second sampler periodically samples the second received signal at the second sample time to generate a second sample stream offset from the first sample stream. The combining circuit comprises a RAKE receiver that reduces the interference by scaling and combining despread values generated from the offset sample streams.

摘要翻译： 一种用于多分支无线接收机的方法和装置，用于在第一和第二采样时间周期性地采样对应于第一和第二接收器分支的第一和第二接收信号，以产生偏移采样流。 然后将偏移采样流组合在组合电路中以减少接收信号中存在的干扰。 在示例性实施例中，多分支无线接收机包括产生第一和第二偏移采样时间的偏移电路。 第一采样器在第一采样时间周期性地采样第一接收信号以产生第一采样流，而第二采样器在第二采样时间周期性地采样第二接收信号，以产生从第一采样流偏移的第二采样流。 组合电路包括RAKE接收机，其通过缩放和组合从偏移采样流产生的解扩值来减少干扰。

公开(公告)号：US08750407B2

公开(公告)日：2014-06-10

申请号：US12239889

申请日：2008-09-29

申请人： Jung-Fu Cheng ,  Tracy Fulghum ,  Douglas Cairns

发明人： Jung-Fu Cheng ,  Tracy Fulghum ,  Douglas Cairns

IPC分类号： H04L27/00

CPC分类号： H04L25/0236 ,  H04B2201/70701 ,  H04B2201/709727 ,  H04L1/0017 ,  H04L1/0041 ,  H04L1/0068 ,  H04L25/021 ,  H04L25/0226 ,  H04L25/03044 ,  H04L25/03324 ,  H04L25/061 ,  H04L27/0012 ,  H04L27/227 ,  H04L27/3455 ,  H04L27/3818 ,  H04L2001/0098 ,  H04L2025/03401 ,  H04L2025/0342 ,  H04L2025/03426 ,  H04L2025/03509 ,  H04L2025/03796 ,  H04L2027/0061 ,  H04L2027/0093

摘要： A transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols. In one embodiment, the transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16 QAM or 64 QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another embodiment, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns.

摘要翻译： 用于使用软导频符号在数字通信系统中对符号序列进行编码和发送的发射机，信道编码器和方法。 在一个实施例中，发射机通过用低阶调制（诸如BPSK或QPSK）调制软导频符号，以较高阶调制方式调制剩余符号，从而发送具有比序列中的剩余符号更高的可靠性的一组软导频符号， 作为16 QAM或64 QAM。 发射机与接收机共享软导频符号的调制类型和位置（时间/频率/码）。 与传统的固定飞行员不同，软飞行员仍然携带一些数据。 此外，软导频器在建立解调高阶调制符号时必不可少的幅度参考是特别有用的。 在另一个实施例中，通过信道编码比特的低级删截插入软导频符号，并用已知的比特模式替换被删余的比特。

公开(公告)号：US20070047628A1

公开(公告)日：2007-03-01

申请号：US11215584

申请日：2005-08-30

申请人： Tracy Fulghum ,  Douglas Cairns

发明人： Tracy Fulghum ,  Douglas 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。