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1.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：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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3.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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4.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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6.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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8.发明授权Methods and apparatus for interference cancellation using complex interference orthogonalization techniques 有权使用复杂干涉正交化技术进行干扰消除的方法和装置公开(公告)号：US06515980B1
公开(公告)日：2003-02-04
申请号：US09401565
申请日：1999-09-22
IPC分类号： H04B7216
CPC分类号： H04B1/7105
摘要： A communications signal including components associated with desired and interfering signals that are modulated according to respective first and second modulation sequences is processed to generate a baseband signal. The baseband signal is correlated with the first modulation sequence, e.g., a combination of a first scrambling sequence and a first spreading sequence, to produce a first correlation output. The baseband signal is also correlated with a combination of the first modulation sequence and a complex component (e.g., a second scrambling sequence) of the second modulation sequence, to generate a second correlation output. The first and second correlation outputs are combined to generate an estimate of information represented by the first signal, for example, by combining the first and second correlation outputs to produce a first RAKE finger output and combining the first RAKE finger output with a second RAKE finger output to generate an estimate of information represented by the desired signal. Related receiver apparatus is also discussed.
摘要翻译： 处理包括与根据相应的第一和第二调制序列调制的期望和干扰信号相关联的组件的通信信号，以产生基带信号。 基带信号与第一调制序列（例如，第一加扰序列和第一扩频序列的组合）相关，以产生第一相关输出。 基带信号也与第一调制序列和第二调制序列的复分量（例如，第二加扰序列）的组合相关，以产生第二相关输出。 第一和第二相关输出被组合以产生由第一信号表示的信息的估计，例如通过组合第一和第二相关输出以产生第一RAKE手指输出，并将第一RAKE手指输出与第二RAKE手指 输出以产生由期望信号表示的信息的估计。 还讨论了相关的接收机设备。
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9.发明授权Device and method for receiving and reconstructing signals with improved perceived signal quality 失效用于接收和重建具有改善的感知信号质量的信号的装置和方法
公开(公告)号：US6004028A
公开(公告)日：1999-12-21
申请号：US292304
申请日：1994-08-18
CPC分类号： H04L1/004
摘要： A device and method for receiving and reconstructing signals with improved perceived signal quality in a digital communications system is disclosed. The device and method utilize side information defining the quality or accuracy of recovered digital symbols representing an information signal and also utilizing past frame erasure information to determine whether to erase or use a frame to reconstruct the original information signal even though an error detection mechanism indicates that no error exists in the recovered digital symbols of the frame.
摘要翻译： 公开了一种用于在数字通信系统中接收和重建具有改善的感知信号质量的信号的装置和方法。 该装置和方法利用定义表示信息信号的恢复的数字符号的质量或精度的侧面信息，并且还利用过去的帧擦除信息来确定是否擦除或使用帧来重建原始信息信号，即使错误检测机制指示 在帧的恢复的数字符号中不存在错误。
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公开(公告)号：US5878093A
公开(公告)日：1999-03-02
申请号：US766081
申请日：1996-12-16
CPC分类号： H04B7/0857 , H04L1/06
摘要： In a communications system wherein a broadcast signal is received by a plurality of antennas each connected to a receiver, the resulting plurality of received signals are jointly subjected to automatic frequency correction (AFC) before interference rejection combining (IRC) or maximal ratio combining (MRC) processing to output an estimate of the broadcast signal. The joint automatic frequency correction processing involves computing and applying a frequency offset on a sample by sample basis to each of the received signals to output corresponding frequency corrected received signals for IRC or MRC processing.
摘要翻译： 在其中广播信号由连接到接收机的多个天线接收的通信系统中，所得到的多个接收信号在抗干扰组合（IRC）或最大比组合（MRC）之前共同进行自动频率校正（AFC） ）处理以输出广播信号的估计。 联合自动频率校正处理涉及对每个接收信号计算和采样样本的频偏，以输出相应的经频率校正的接收信号用于IRC或MRC处理。
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