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公开(公告)号：US08599972B2
公开(公告)日：2013-12-03
申请号：US10869456
申请日：2004-06-16
IPC分类号： H03D1/00
CPC分类号： H04B1/712 , H04B17/309 , H04B2201/709727
摘要： A method and apparatus removes bias from an initial signal-to-interference ratio (SIR). In an exemplary embodiment, an initial SIR calculator in an SIR processor calculates the initial SIR based on the signal received by the wireless receiver, while an average SIR calculator in the SIR processor generates an average SIR. Using the average SIR, a bias remover removes the bias from the initial SIR.
摘要翻译： 一种方法和装置从初始信号干扰比（SIR）中去除偏差。 在示例性实施例中，SIR处理器中的初始SIR计算器基于由无线接收机接收的信号来计算初始SIR，而SIR处理器中的平均SIR计算器产生平均SIR。 使用平均SIR，偏移去除器从初始SIR中去除偏差。
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2.发明授权公开(公告)号：US06683924B1
公开(公告)日：2004-01-27
申请号：US09420957
申请日：1999-10-19
IPC分类号： H04L2706
CPC分类号： H04B1/712 , H04B1/709 , H04B1/7117 , H04B2201/709727
摘要： Correlation times for a RAKE receiver are determined from time differentials between multipath components of a received signal based on correlation metrics, preferably signal strength measurements, associated with the multipath components. According to various embodiments of the present invention, selection strategies are employed in which “desired signal collecting” and “interference collecting” correlation times may be selected using average optimal (AO) or instantaneous optimal (IO) selection criteria. These criteria may include, for example, thresholds for signal strengths associated with multipath components of a signal at the correlation times, where the signal strengths may include absolute or relative measures of signal power or signal to noise ratio. According to alternative embodiments, correlation times are selected using an inverse filter of an estimated channel response. Related apparatus is also described.
摘要翻译： 基于与多路径分量相关联的相关度量，优选信号强度测量，从接收信号的多径分量之间的时间差确定RAKE接收机的相关时间。 根据本发明的各种实施例，采用选择策略，其中可以使用平均最优（AO）或瞬时最优（IO）选择标准来选择“期望的信号收集”和“干扰收集”相关时间。 这些标准可以包括例如与在相关时间的信号的多径分量相关联的信号强度的阈值，其中信号强度可以包括信号功率或信噪比的绝对或相对测量。 根据替代实施例，使用估计的信道响应的逆滤波器来选择相关时间。 还描述了相关装置。
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公开(公告)号：US07787522B2
公开(公告)日：2010-08-31
申请号：US10412504
申请日：2003-04-11
IPC分类号： H04B1/00
CPC分类号： H04B1/7105 , H04B1/709 , H04B1/712 , H04L25/03171 , H04L25/03331
摘要： A CDMA communication system uses a RAKE receiver, a code correlator and a multi-code joint detector to jointly detect symbols in two or more received signals contained within a composite signal. The RAKE receiver separates the composite signal into two or more RAKE output signals by despreading the composite signal using selected spreading codes. The multi-code joint detector jointly detects the symbols in the received signals using the RAKE receiver output signals, cross-correlations between the spreading codes generated by the code correlator, and RAKE combining weights based on a noise covariance matrix. The multi-code joint detector also includes a trellis that represents possible states and state transitions and a branch metric calculator for calculating branch metrics associated with the state transitions based on the RAKE receiver output signals and the cross-correlations between the spreading codes.
摘要翻译： CDMA通信系统使用RAKE接收机，码相关器和多码联合检测器联合检测复合信号中包含的两个或多个接收信号中的符号。 RAKE接收机通过使用选择的扩展码解扩复合信号，将复合信号分离成两个或更多个RAKE输出信号。 多码联合检测器使用RAKE接收机输出信号，由码相关器产生的扩展码之间的互相关和基于噪声协方差矩阵的RAKE组合权重联合检测接收信号中的符号。 多码联合检测器还包括表示可能的状态和状态转换的网格，以及用于基于RAKE接收机输出信号和扩展码之间的互相关来计算与状态转换相关联的分支度量的分支度量计算器。
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4.发明授权Baseband processors and methods and systems for decoding a received signal having a transmitter or channel induced coupling between bits 有权基带处理器以及用于对接收到的信号进行解码的方法和系统，所述接收信号具有在位之间的发射机或信道感应耦合公开(公告)号：US06697441B1
公开(公告)日：2004-02-24
申请号：US09587995
申请日：2000-06-06
IPC分类号： H04L2722
CPC分类号： H03M13/2957 , H03M13/2707 , H03M13/2721 , H03M13/3905 , H03M13/6325 , H03M13/6331 , H04L1/005 , H04L1/0071 , H04L25/03171 , H04L25/03318 , H04L25/03337 , H04L25/067 , H04L27/22 , H04L27/38
摘要： Received signals are decoded based on a coupling between bits of the received signals introduced by the channel over which the signal is transmitted or by the transmitter which transmitted the signals. For example, in a higher-order modulation scheme, such as 8-PSK, individual bits grouped in a given symbol are generally coupled rather than fully independent. Accordingly, decoding information on a first one of the bits processed through a forward error correction decoder may be used to adjust the soft information from a demodulator for one or more of the other bits contained in the same symbol for use in processing those bits through the forward error correction decoder. Particularly where interleaving is utilized, a first bit may be processed through the decoder before the soft information on another of the bits is needed, thereby allowing an intermediate decision soft value for the first bit to be used in generating the input value to the decoder for the subsequent bit. Alternatively, a multi-pass process may be utilized which may allow all of the bits to be decoded utilizing soft information from the first decoding pass to affect the input to the decoder during the second pass for coupled bits such as those transmitted in a common symbol.
摘要翻译： 接收信号基于由发送信号的信道所引入的接收信号的位之间的耦合或通过发送信号的发送器进行解码。 例如，在诸如8-PSK的更高阶调制方案中，分组在给定符号中的各个比特通常耦合而不是完全独立的。 因此，可以使用通过前向纠错解码器处理的比特中的第一个比特的解码信息来从解调器调整包含在相同符号中的一个或多个其他比特的软信息，以用于通过 前向纠错解码器。 特别是在使用交织的情况下，可以在需要对另一位的软信息之前通过解码器处理第一位，从而允许将第一位的中间判定软值用于向译码器生成输入值 随后的一点。 或者，可以使用多遍处理，其可以利用来自第一解码通过的软信息来解码所有比特，以在第二遍期间影响到解码器的输入，用于耦合比特，例如以公共符号 。
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公开(公告)号：US5822380A
公开(公告)日：1998-10-13
申请号：US689584
申请日：1996-08-12
CPC分类号： H04L25/0204
摘要： An apparatus for estimating channel tap coefficients of a communication channel is provided which calculates channel tap coefficient estimates as a function of a received sample stream corresponding to the channel whose channel taps are being estimated and as a function of at least one other received sample stream corresponding to another receive channel. The apparatus receives digital sample streams from a plurality of receive channels and an impairment correlation matrix containing impairment correlation information among multiple receive channels. In one embodiment, the apparatus includes a precombiner which forms linear combinations of initial error samples from a first received sample stream and a second received sample stream to generate refined error samples for generating channel tap coefficient estimates. In one embodiment, an impairment correlation estimator receives the complex samples and the channel tap coefficients and generates an impairment correlation matrix for multiple receive channels. In one embodiment, a detector receives the complex samples, channel tap coefficients and the impairment correlation among multiple receive channels, and detects the transmitted information symbols. In one embodiment, the apparatus comprises a Kalman filter.
摘要翻译： 提供了一种用于估计通信信道的信道抽头系数的装置，其计算作为与正在估计其信道抽头的信道相对应的接收的采样流的函数的信道抽头系数估计，并且作为对应于其中的至少一个其他接收的采样流的函数 到另一个接收频道。 该装置从多个接收信道接收数字样本流，以及在多个接收信道之间包含损害相关信息的损害相关矩阵。 在一个实施例中，该装置包括预组合器，其形成来自第一接收采样流和第二接收采样流的初始误差采样的线性组合，以产生用于产生信道抽头系数估计的精细误差样本。 在一个实施例中，损害相关估计器接收复数采样和信道抽头系数，并为多个接收信道生成损害相关矩阵。 在一个实施例中，检测器接收多个接收信道中的复数样本，信道抽头系数和损害相关性，并且检测所发送的信息符号。 在一个实施例中，该装置包括卡尔曼滤波器。
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6.发明授权Method and apparatus for DS-CDMA interference suppression using code-specific combining 有权使用代码特定组合的DS-CDMA干扰抑制的方法和装置公开(公告)号：US08432952B2
公开(公告)日：2013-04-30
申请号：US10720492
申请日：2003-11-24
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。
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7.发明授权Methods and receivers that estimate multi-path delays by removing signal rays from a power-delay profile 有权通过从功率延迟分布中去除信号线来估计多径延迟的方法和接收机公开(公告)号：US07212591B2
公开(公告)日：2007-05-01
申请号：US10424958
申请日：2003-04-28
IPC分类号： H03D1/00
CPC分类号： H04B1/7113 , H04B1/7077 , H04B1/7117 , H04L25/0212
摘要： A method for estimating a plurality of delay values in a multi-path communication signal. Correlation values are generated that correspond to a plurality of delay values associated with the multi-path communication signal. A first power-delay profile (PDP) sequence is produced from the correlation values and is used to estimate a first delay value. A first reference PDP sequence is generated based on a predefined PDP sequence and the first PDP sequence. The first reference PDP sequence is removed from the first PDP sequence so as to remove at least a portion of the contributions to the first PDP sequence from the first delay value, and to provide a second PDP sequence. A second value is estimated based on the second PDP sequence.
摘要翻译： 一种用于估计多径通信信号中的多个延迟值的方法。 产生与多路通信信号相关联的多个延迟值对应的相关值。 从相关值产生第一功率延迟分布（PDP）序列，并且用于估计第一延迟值。 基于预定义的PDP序列和第一PDP序列生成第一参考PDP序列。 从第一PDP序列中移除第一参考PDP序列，以便从第一延迟值中去除对第一PDP序列的贡献的至少一部分，并提供第二PDP序列。 基于第二PDP序列估计第二值。
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公开(公告)号：US6034987A
公开(公告)日：2000-03-07
申请号：US768319
申请日：1996-12-17
IPC分类号： H04B1/12 , H04B1/713 , H04B1/715 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/12 , H04J3/00 , H04K1/10
CPC分类号： H04B7/0894 , H04B1/713 , H04B1/715 , H04B7/0671 , H04B7/084 , H04B1/126
摘要： A delay spread is created in a digital radio signal to reduce the coherence bandwidth and facilitate frequency hopping to reduce the effect of fading losses within an enclosed propagation environment The delay spread is introduced into the signal in several ways. One technique disclosed employs a transmitter with two separate antennas one of which transmits the digital signal and the other of which transmits the same signal after a phase delay has been introduced into the signal. The carrier frequency of the signals is hopped between at least two frequencies and the receiver processes the resulting signals. In another embodiment, a single transmit antenna is used but the signal is received by two different antennas with the output signal from one of those antennas being phase delayed before combining it with the other prior to processing by the receiver circuitry. Phase delay is also introduced at baseband into the signals to be transmitted by rotating the I and Q components of the waveforms before modulation.
摘要翻译： 在数字无线电信号中产生延迟扩展以减少相干带宽并促进跳频以减少封闭传播环境内的衰落损耗的影响。延迟扩展以几种方式被引入到信号中。 所公开的一种技术采用具有两个单独天线的发射机，其中一个发射数字信号，而另一个天线在相位延迟被引入信号之后发射相同的信号。 信号的载波频率在至少两个频率之间跳跃，并且接收机处理所得到的信号。 在另一个实施例中，使用单个发射天线，但是信号由两个不同的天线接收，其中一个天线的输出信号在被接收机电路处理之前与另一天线组合之前被相位延迟。 在调制之前，通过旋转波形的I和Q分量，在基带处将相位延迟也引入要发送的信号。
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9.发明授权公开(公告)号：US06975672B2
公开(公告)日：2005-12-13
申请号：US09756504
申请日：2001-01-08
CPC分类号： H04L25/03305 , H04B2201/709727 , H04L25/03299
摘要： A communications signal representing symbols encoded according to respective portions of a spreading sequence is decoded. Time-offset correlations of the communications signal with the spreading sequence are generated. The time-offset correlations are combined to generate first estimates for the symbols. Intersymbol interference factors that include a relationship among different portions of the spreading sequence are determined, and a second estimate for one of the symbols is generated from the first estimates based on the determined intersymbol interference factors. An intersymbol interference factor may include a relationship between a first portion of the spreading sequence associated with the one symbol to a second portion of the spreading sequence associated with another symbol and may be determined, for example, from the spreading sequence and a channel estimate for a channel over which the communications signal is communicated. The invention may be embodied as methods and apparatus, for example, as a receiver included in a communications apparatus, such as a wireless terminal, wireless base station, or other wireless, wireline or optical communications apparatus.
摘要翻译： 表示根据扩展序列的各个部分编码的符号的通信信号被解码。 产生通信信号与扩展序列的时间偏移相关。 时间偏移相关被组合以产生符号的第一估计。 确定包括扩展序列的不同部分之间的关系的符号间干扰因子，并且基于确定的符号间干扰因子从第一估计生成符号之一的第二估计。 符号间干扰因子可以包括与一个符号相关联的扩展序列的第一部分与与另一符号相关联的扩展序列的第二部分之间的关系，并且可以例如从扩展序列和用于 通信信号通过该信道。 本发明可以被实现为例如作为诸如无线终端，无线基站或其他无线，有线或光通信设备的通信设备中包括的接收机的方法和装置。
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公开(公告)号：US06801565B1
公开(公告)日：2004-10-05
申请号：US09344898
申请日：1999-06-25
IPC分类号： H04B1707
CPC分类号： H04B1/712 , H04B1/709 , H04B1/7117
摘要： Information encoded in a spread spectrum signal transmitted in a communications medium is recovered. A composite signal including a spread spectrum signal is received from the communications medium, and correlated with a spreading sequence to generate time-offset correlations. Respective first and second groups of the correlations are combined, e.g., according to estimated channel coefficients, to produce respective first and second combined values. The first and second combined values are then combined in a manner that compensates for correlated impairment in the composite signal to generate an estimate information in the transmitted spread spectrum signal, e.g., using weighting factors generated from an estimated composite channel response and an estimated impairment correlation, or adaptively generated weighting factors. Related apparatus are also described.
摘要翻译： 在通信介质中发送的扩频信号中编码的信息被恢复。 从通信介质接收包括扩展频谱信号的复合信号，并与扩展序列相关以产生时间偏移相关。 各个相关的第一和第二组例如根据估计的信道系数被组合，以产生相应的第一和第二组合值。 然后，以补偿复合信号中的相关损害的方式组合第一和第二组合值，以在发射的扩频信号中产生估计信息，例如，使用从估计的复合信道响应和估计的损耗相关性产生的加权因子 ，或自适应产生的加权因子。 还描述了相关装置。
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