公开(公告)号：US20050152486A1

公开(公告)日：2005-07-14

申请号：US10754340

申请日：2004-01-09

Applicant: Xiao-an Wang

Inventor： Xiao-an Wang

IPC: H03H7/30 ,  H03K5/159 ,  H04B1/10 ,  H04L1/06 ,  H04L1/20 ,  H04L25/03

CPC classification number: H04B1/712 ,  H04B2201/709727 ,  H04L1/20 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03605 ,  H04L2025/03643

Abstract: Methods of recovering data in a received signal sent in a communications media are disclosed. Composite channel impulse responses are first estimated. Channel-tap locations are then assigned to suppress the interference noises by sequential search schemes or heuristic search schemes based on estimated composite channel impulse responses. A sequential search scheme optimizes a predetermined design criterion in a sequential manner. Also described are recursive evaluations of the design criterion and the inverses of the noise covariance matrices based on the composite channel impulse response during a sequential search. A heuristic search scheme selects channel-tap locations based on a set of pre-selected channel-tap locations. The set of pre-selected channel-tap locations is determined according to the estimated composite channel impulse response. A method of estimating energy levels of known interference sources is also described.

Abstract translation: 公开了在通信介质中发送的接收信号中恢复数据的方法。 首先估计复合信道脉冲响应。 然后分配频道抽头位置以通过基于估计的复合信道脉冲响应的顺序搜索方案或启发式搜索方案来抑制干扰噪声。 顺序搜索方案以顺序方式优化预定的设计标准。 还描述了基于在顺序搜索期间的复合信道脉冲响应的设计标准和噪声协方差矩阵的反演的递归评估。 启发式搜索方案基于一组预先选择的频道抽头位置来选择频道抽头位置。 根据估计的复合信道脉冲响应来确定预先选择的信道抽头位置集合。 还描述了估计已知干扰源的能量水平的方法。

公开(公告)号：US20050111528A1

公开(公告)日：2005-05-26

申请号：US10720492

申请日：2003-11-24

Applicant: Tracy Fulghum ,  Gregory Bottomley ,  Yi-Pin Wang ,  Ali Khayrallah

Inventor： Tracy Fulghum ,  Gregory Bottomley ,  Yi-Pin Wang ,  Ali Khayrallah

IPC: H04J13/00 ,  H04B1/69

CPC classification number: H04B1/7107 ,  H04B1/712 ,  H04B2201/709727 ,  H04J13/0048

Abstract: 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.

Abstract translation: 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：US20050078742A1

公开(公告)日：2005-04-14

申请号：US10959923

申请日：2004-10-06

Applicant: Douglas Cairns ,  Ali Khayrallah ,  Gregory Bottomley

Inventor： Douglas Cairns ,  Ali Khayrallah ,  Gregory Bottomley

IPC: H04B1/707

CPC classification number: H04B1/712 ,  H04B1/709 ,  H04B1/7117 ,  H04B2201/709727

Abstract: Channel and correlation characteristics are determined for a composite signal. Respective combining weights for information from the composite signal are determined for respective ones of a plurality of candidate delays based on the determined channel and correlation characteristics. A group of delays, e.g., RAKE correlator delays or chip equalizer filter taps, is selected from the plurality of candidate delays based on the determined weights. Information from the composite signal for the selected delays is processed according to a spreading code to generate a symbol estimate. The invention may be embodied as methods, apparatus and computer program products.

Abstract translation: 为复合信号确定通道和相关特性。 基于确定的信道和相关特性，针对多个候选延迟中的各个确定来自复合信号的信息的相应组合权重。 基于所确定的权重，从多个候选延迟中选择一组延迟，例如RAKE相关器延迟或码片均衡器滤波器抽头。 根据扩展码处理来自所选延迟的复合信号的信息以产生符号估计。 本发明可以体现为方法，装置和计算机程序产品。

公开(公告)号：US06529545B2

公开(公告)日：2003-03-04

申请号：US09821931

申请日：2001-03-30

Applicant: Esa Tiirola ,  Juha Ylitalo

Inventor： Esa Tiirola ,  Juha Ylitalo

IPC: H04B1707

CPC classification number: H04B7/0897 ,  H04B1/7115 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/0851 ,  H04B7/0857 ,  H04B2201/70701 ,  H04B2201/709727

Abstract: The invention relates to a Rake receiver of a CDMA system using IRC. The Rake receiver comprises at least two antenna branches, at least one Rake finger, and a delay estimator. The delay estimator comprises a despreader and an allocator for selecting at least one delay, and allocating a Rake finger for processing the signal component found by informing the Rake finger of the delay found. The delay estimator further comprises: a channel estimator, an interference estimator for generating an interference signal, a weighting coefficient part for providing each antenna branch with weighting coefficients maximizing the Signal-to-Interference-and-Noise Ratio, a multiplier for multiplying the pilot part by a weighting coefficient, and an antenna branch summer for combining the despread pilot parts, received via the separate antenna branches and multiplied by the weighting coefficient, to one combined pilot signal, on which combined pilot signal the selection is based in the allocator.

Abstract translation: 本发明涉及使用IRC的CDMA系统的Rake接收机。 耙式接收机包括至少两个天线分支，至少一个耙指和延迟估计器。 延迟估计器包括解扩器和用于选择至少一个延迟的分配器，并且分配耙指以处理通过向耙指通知发现的延迟所发现的信号分量。 延迟估计器还包括：信道估计器，用于产生干扰信号的干扰估计器，用于向每个天线分支提供最大化信噪比噪声比的加权系数的加权系数部分，用于将导频 部分乘以加权系数，以及天线分支加法器，用于将经由分离的天线分支接收并乘以加权系数的解扩导频部分组合到一个组合导频信号，组合导频信号选择基于分配器。

公开(公告)号：US09025638B2

公开(公告)日：2015-05-05

申请号：US10991878

申请日：2004-11-18

Applicant: Anders Wallén

Inventor： Anders Wallén

IPC: H04B1/00 ,  H04B1/10 ,  H04L1/20 ,  H04L27/00

CPC classification number: H04B1/10 ,  H04B2201/709727 ,  H04L1/20 ,  H04L2027/0065

Abstract: A receiver circuit provides improved noise estimation processing by at least partially removing receiver frequency error bias. An initial noise estimate is compensated using an error term based on the observed receiver frequency error, and the resulting compensated noise estimate can be used to improve other signal processing in the receiver. For example, the receiver may use compensated noise estimates to generate signal quality estimates, e.g., Signal-to-Interference (SIR) estimates, having improved accuracy. Additionally, or alternatively, the receiver may use the compensated noise estimates to generate RAKE combining weights having improved noise suppression characteristics. In an exemplary embodiment, the initial noise estimate is a noise correlation matrix generated from a received reference signal, e.g., pilot symbols, and the error term is an error matrix directly generated using he observed receiver frequency error and channel estimates taken from the reference signal.

Abstract translation: 接收机电路通过至少部分地去除接收机频率误差偏差来提供改进的噪声估计处理。 使用基于观察到的接收机频率误差的误差项来补偿初始噪声估计，并且所得到的补偿噪声估计可以用于改善接收机中的其他信号处理。 例如，接收机可以使用经补偿的噪声估计来产生具有提高的精度的信号质量估计，例如信号干扰（SIR）估计。 另外或替代地，接收机可以使用经补偿的噪声估计来生成具有改进的噪声抑制特性的RAKE组合权重。 在示例性实施例中，初始噪声估计是从接收的参考信号（例如导频符号）产生的噪声相关矩阵，并且误差项是使用他观察到的接收机频率误差和从参考信号获取的信道估计直接产生的误差矩阵 。

公开(公告)号：US08908781B2

公开(公告)日：2014-12-09

申请号：US13403369

申请日：2012-02-23

Applicant: Douglas Cairns ,  Elias Jonsson

Inventor： Douglas Cairns ,  Elias Jonsson

IPC: H04L27/00 ,  H04L25/02 ,  H04L27/227 ,  H04L27/38 ,  H04L27/34 ,  H04L25/06 ,  H04L25/03 ,  H04L1/00

CPC classification number: 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

Abstract: A receiver and method for receiving and processing a sequence of transmitted symbols in a digital communication system utilizing soft pilot symbols. A set of soft pilot symbols are transmitted 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 receiver knows the modulation type and location (time/frequency/code) of the soft pilot symbols, and demodulates them first. The receiver uses the demodulated soft pilot symbols as known symbols to estimate parameters of the received radio signal. 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.

Abstract translation: 一种用于在利用软导频符号的数字通信系统中接收和处理发送符号序列的接收机和方法。 通过用诸如BPSK或QPSK之类的较低阶调制来调制软导频符号，同时以诸如16QAM或64等更高阶调制调制剩余符号，发送一组软导频符号比该序列中的剩余符号更高的可靠性。 QAM。 接收机知道软导频符号的调制类型和位置（时间/频率/码），并首先解调它们。 接收机使用解调的软导频符号作为已知符号来估计所接收的无线电信号的参数。 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。

公开(公告)号：US08665937B2

公开(公告)日：2014-03-04

申请号：US13514009

申请日：2009-12-10

Applicant: Karl Torbjörn Wigren

Inventor： Karl Torbjörn Wigren

IPC: H04B17/00

CPC classification number: H04B1/7097 ,  H04B1/711 ,  H04B17/26 ,  H04B17/327 ,  H04B17/345 ,  H04B2201/709718 ,  H04B2201/709727

Abstract: A method for noise rise estimation in a wireless communication system comprises receiving (210) of radio signals. An interference whitening (212) is performed. A useful signal power for a first user after the interference whitening is determined (214) for a plurality of time instances. Furthermore, a first user noise floor compensation factor is derived (216) based on combining weights for the first user used in the interference whitening. A probability distribution for a compensated useful signal power for the first user is estimated (218). A conditional probability distribution of a noise floor measure is computed (220). A noise rise measure for the first user is then calculated (222) based at least on the compensated useful signal power for the first user and the conditional probability distribution of a noise floor measure.

Abstract translation: 一种用于无线通信系统中的噪声上升估计的方法包括：接收（210）无线电信号。 执行干涉增白（212）。 在干扰白化之后确定（214）多个时间实例中的第一用户的有用信号功率。 此外，基于在干扰增白中使用的第一用户的组合权重，导出（216）第一用户噪声基底补偿因子。 估计用于第一用户的补偿有用信号功率的概率分布（218）。 计算噪声本底度量的条件概率分布（220）。 然后，至少基于第一用户的补偿有用信号功率和噪声基底测量的条件概率分布来计算（222）第一用户的噪声上升测量值（222）。

公开(公告)号：US08588349B2

公开(公告)日：2013-11-19

申请号：US13253075

申请日：2011-10-05

Applicant: Vijay Nagarajan ,  Louis L. Scharf ,  Anand P. Narayan

Inventor： Vijay Nagarajan ,  Louis L. Scharf ,  Anand P. Narayan

IPC: H04L25/08

CPC classification number: H04B1/7107 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/709727

Abstract: A receiver employs low-rate processing to synthesize the effect of high-rate interference in a received multi-rate signal. Each high-rate subchannel is analyzed on its low-rate descendents to produce symbol estimates for each low-rate symbol interval. The symbol estimates are applied to low-rate descendent subchannels, which are then combined to synthesize the effects of the high-rate interference. An interference canceller processes the synthesized interference with the received signal for producing an interference-cancelled signal. Alternatively, analogous steps may be applied at high-rate to analyze, synthesize, and cancel the effects of low-rate interference in a multi-rate signal.

公开(公告)号：US08391396B2

公开(公告)日：2013-03-05

申请号：US13081031

申请日：2011-04-06

Applicant: Elias Jonsson ,  Andres Reial

Inventor： Elias Jonsson ,  Andres Reial

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04W72/12 ,  H04B1/7103 ,  H04B1/712 ,  H04B7/0615 ,  H04B7/0669 ,  H04B7/0697 ,  H04B2201/70701 ,  H04B2201/709727 ,  Y02D70/40 ,  Y02D70/444

Abstract: The teachings herein disclose methods and apparatus that simplify impairment correlation estimation for received signal processing, based on determining, for any given processing interval, which impairment contributors should be considered in the estimation of overall received signal impairment correlations. These simplifications reduce computational processing requirements, allowing reduced circuit complexity and/or reduced operating power, and improve receiver performance. A corresponding transmitter and transmission method include transmitting multiple information streams to targeted receivers according to ongoing scheduling, and controlling the ongoing scheduling to reduce the number of impairment contributors considered in impairment correlation estimation at the targeted receivers. In one embodiment, a receiver identifies which impairment contributors to consider based on receiving control information. In another embodiment, the receiver identifies the impairment contributors to consider based on background processing, e.g., background determination of parametric model fitting parameters for a plurality of impairment contributors, and observing those model fitting parameters over time.

Abstract translation: 本文的教导公开了简化对接收信号处理的损害相关估计的方法和装置，其基于对于任何给定的处理间隔，在估计总体接收信号损害相关中应考虑哪些损害贡献者。 这些简化减少了计算处理要求，从而降低了电路复杂度和/或降低了操作功率，并提高了接收机性能。 相应的发射机和传输方法包括根据正在进行的调度向目标接收机发送多个信息流，并控制正在进行的调度，以减少目标接收机的损害相关估计中所考虑的损害贡献者的数量。 在一个实施例中，接收机基于接收控制信息识别要考虑的损害贡献者。 在另一个实施例中，接收机基于背景处理识别要考虑的损害贡献者，例如用于多个损害贡献者的参数模型拟合参数的背景确定，以及随时间观察这些模型拟合参数。

公开(公告)号：US20120243594A1

公开(公告)日：2012-09-27

申请号：US13514009

申请日：2009-12-10

Applicant: Karl Torbjörn Wigren

Inventor： Karl Torbjörn Wigren

IPC: H04B17/00

CPC classification number: H04B1/7097 ,  H04B1/711 ,  H04B17/26 ,  H04B17/327 ,  H04B17/345 ,  H04B2201/709718 ,  H04B2201/709727

Abstract: A method for noise rise estimation in a wireless communication system comprises receiving (210) of radio signals. An interference whitening (212) is performed. A useful signal power for a first user after the interference whitening is determined (214) for a plurality of time instances. Furthermore, a first user noise floor compensation factor is derived (216) based on combining weights for the first user used in the interference whitening. A probability distribution for a compensated useful signal power for the first user is estimated (218). A conditional probability distribution of a noise floor measure is computed (220). A noise rise measure for the first user is then calculated (222) based at least on the compensated useful signal power for the first user and the conditional probability distribution of a noise floor measure.

Abstract translation: 一种用于无线通信系统中的噪声上升估计的方法包括：接收（210）无线电信号。 执行干涉增白（212）。 在干扰白化之后确定（214）多个时间实例中的第一用户的有用信号功率。 此外，基于在干扰增白中使用的第一用户的组合权重，导出（216）第一用户噪声基底补偿因子。 估计用于第一用户的补偿有用信号功率的概率分布（218）。 计算噪声本底度量的条件概率分布（220）。 然后，至少基于第一用户的补偿有用信号功率和噪声基底测量的条件概率分布来计算（222）第一用户的噪声上升测量值（222）。