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1.发明授权Method and apparatus for multipath delay estimation in direct sequence spread spectrum communication systems 失效直接序列扩频通信系统中多径延迟估计的方法和装置公开(公告)号：US06839378B1
公开(公告)日：2005-01-04
申请号：US09005580
申请日：1998-01-12
IPC分类号： H04B1/711 , H04B1/709 , H04B1/7113 , H04B7/26 , H04B1/69
CPC分类号： H04B1/7113
摘要： Multipath delay estimation of a direct sequence spread spectrum (DS-SS) signal transmitted in a multipath fading channel is accomplished by measuring the envelope of the signal to determine a new delay estimate. Delay estimates are also obtained in ray strength order, by subtracting out the influence of the stronger rays on the weaker ones. This subtraction approach can be performed iteratively, allowing further refinement of the delay estimates. Delay estimates can also be determined by minimizing the mean square error (MSE) between a measured correlation function and a modeled correlation function. The minimum mean square error (MMSE) approach can performed iteratively, to further refine the delay estimates. Maximum likelihood (ML) delay estimates can also be obtained by exploiting side information regarding the transmit and receive pulse shapes.
摘要翻译： 在多径衰落信道中发送的直接序列扩频（DS-SS）信号的多路径延迟估计是通过测量信号的包络来确定新的延迟估计来实现的。 通过减去较强光线对较弱光线的影响，也可以通过光线强度顺序获得延迟估计。 可以迭代地执行该减法方法，从而进一步改进延迟估计。 延迟估计也可以通过最小化测量的相关函数和建模的相关函数之间的均方误差（MSE）来确定。 最小均方误差（MMSE）方法可以迭代地进行，以进一步改进延迟估计。 最大似然（ML）延迟估计也可以通过利用有关发射和接收脉冲形状的侧面信息来获得。
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公开(公告)号：US06621858B2
公开(公告)日：2003-09-16
申请号：US09729524
申请日：2000-12-04
IPC分类号： H04B169
CPC分类号： H04B1/7075 , H04B1/70752 , H04B1/70758 , H04B1/7093 , H04B1/7095 , H04B1/7115 , H04B2201/70711
摘要： A flexible sliding correlator for use in a spread spectrum receiver divides baseband signal samples into different groups, associates each group with a different section of a spreading code, and combines ones of the signal samples with corresponding values in the spreading code section. The groupings and spreading code sections can be changed during operation of the receiver to maximize performance of the receiver under different or changing conditions. In addition, the sample and spreading code value combinations can be further combined in different ways, and the further combinations can be changed during operation of the receiver. According to another aspect of the invention, the baseband signal can be sampled either uniformly or non-uniformly. The phase and frequency of the baseband sampling can be adjusted during operation of the receiver so that samples are taken very close to the optimum sampling position, at the peak of a chip waveform in the baseband signal.
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3.发明授权公开(公告)号：US06363105B1
公开(公告)日：2002-03-26
申请号：US09024120
申请日：1998-02-17
IPC分类号： H04L2730
CPC分类号： H04B1/7075 , H04B1/70752 , H04B1/70758 , H04B1/7093 , H04B1/7095 , H04B1/7115 , H04B2201/70711
摘要： A flexible sliding correlator for use in a spread spectrum receiver divides baseband signal samples into different groups, associates each group with a different section of a spreading code, and combines ones of the signal samples with corresponding values in the spreading code section. The groupings and spreading code sections can be changed during operation of the receiver to maximize performance of the receiver under different or changing conditions. In addition, the sample and spreading code value combinations can be further combined in different ways, and the further combinations can be changed during operation of the receiver. According to another aspect of the invention, the baseband signal can be sampled either uniformly or non-uniformly. The phase and frequency of the baseband sampling can be adjusted during operation of the receiver so that samples are taken very close to the optimum sampling position, at the peak of a chip waveform in the baseband signal.
摘要翻译： 用于扩展频谱接收机的灵活的滑动相关器将基带信号样本分成不同的组，每个组与扩展码的不同部分相关联，并将信号样本中的一个与扩展码部分中的相应值组合。 可以在接收机的操作期间改变分组和扩展码部分，以在不同或变化的条件下最大化接收机的性能。 此外，样本和扩展码值组合可以以不同的方式进一步组合，并且可以在接收机的操作期间改变进一步的组合。 根据本发明的另一方面，可以均匀地或不均匀地采样基带信号。 基带采样的相位和频率可以在接收机工作期间进行调整，使样本在基带信号的芯片波形峰值处非常接近最佳采样位置。
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4.发明授权Delay searcher and delay trackers interaction for new delays assignment to rake fingers 有权延迟搜索器和延迟跟踪器互动，为耙指指定新的延迟公开(公告)号：US06891883B2
公开(公告)日：2005-05-10
申请号：US10365857
申请日：2003-02-13
IPC分类号： H04B1/7113 , H04B1/7115 , H04B1/7117 , H04B1/707
CPC分类号： H04B1/7117 , H04B1/7113 , H04B1/7115
摘要： A direct sequence spread spectrum receiver for operating in a multipath fading channel comprises a rake receiver having plural rake fingers. Each rake finger demodulates a received signal from one of plural channel paths. The output of the plural rake fingers are combined. Each rake finger utilizes a select assigned delay to synchronize to a delay of the one channel path. A searcher periodically performs a channel search on the received signal to detect new delays of strongest paths in the channel. Plural trackers, one for each channel path, adjust the select assigned delays between searches performed by the searcher. A delay controller is operatively coupled to the searcher and the trackers. The delay controller compares new delays of the strongest paths from the searcher to the select assigned delays and reassigns one of the select assigned delays with one of the new delays only if the new delay differs from the one select assigned delay more than a predetermined threshold.
摘要翻译： 用于在多径衰落信道中操作的直接序列扩频接收机包括具有多个耙指的耙式接收机。 每个耙指解调来自多个通道路径之一的接收信号。 多个耙指的输出被组合。 每个耙指使用选择分配的延迟来同步到一个通道路径的延迟。 搜索者周期性地对接收到的信号执行频道搜索，以检测频道中最强路径的新延迟。 多个跟踪器（每个通道路径一个）调整由搜索器执行的搜索之间的选择分配的延迟。 延迟控制器可操作地耦合到搜索器和跟踪器。 延迟控制器将来自搜索器的最强路径的新延迟与选择分配的延迟进行比较，并且只有当新延迟与超过预定阈值的一个选择分配的延迟不同时，才将所选择的分配的延迟之一与新的延迟之一重新分配。
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5.发明授权System and method for synchronizing acquisition for a code modulated communication system 失效用于同步代码调制通信系统采集的系统和方法
公开(公告)号：US6147982A
公开(公告)日：2000-11-14
申请号：US1029
申请日：1997-12-30
IPC分类号： H04B1/7075 , H04B1/7077 , H04L7/00 , H04J3/06 , H04B7/212
CPC分类号： H04B1/70775 , H04B1/70755
摘要： A system and method for a synchronizing acquisition of a transmitted signal with a local code in a code modulated communication system. The local code is comprised of a replica of the transmitted code. Samples of the transmitted code are correlated with the local code and resulting periodic output samples having indexes are compared with a threshold. Selected indexes of the samples exceeding the threshold are stored and verified for synchronization. Stored correlation indexes which exceed the threshold are combined, and a responder achieves synchronization between transmitted signal and the local code.
摘要翻译： 一种用于在编码调制通信系统中与本地码同步采集发射信号的系统和方法。 本地代码由发送代码的副本组成。 将发送代码的样本与本地代码相关联，并将具有索引的所得周期性输出样本与阈值进行比较。 存储并验证超过阈值的样本的选定索引以进行同步。 组合超过阈值的存储相关指标，响应者实现发送信号与本地代码之间的同步。
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6.发明授权Delay searcher and delay trackers interaction for new delays assignment to rake fingers 有权延迟搜索器和延迟跟踪器互动，为耙指指定新的延迟公开(公告)号：US06560273B1
公开(公告)日：2003-05-06
申请号：US09168233
申请日：1998-10-07
IPC分类号： H04B1707
CPC分类号： H04B1/7117 , H04B1/7113 , H04B1/7115
摘要： A direct sequence spread spectrum receiver for operating in a multipath fading channel comprises a rake receiver having plural rake fingers. Each rake finger demodulates a received signal from on of plural channel paths. The output of the plural rake fingers are combined. Each rake finger utilizes a select assigned delay to synchronize to a delay of the one channel path. A searcher periodically performs a channel search on the received signal to detect new delays of strongest paths in the channel. Plural trackers, one for each channel path, adjust the select assigned delays between searches performed by the searcher. A delay controller is operatively coupled to the searcher and the trackers. The delay controller compares new delays of the strongest paths from the searcher to the select assigned delays and reassigns one of the select assigned delays with one of the new delays only if the new delay differs from the one select assigned delay more than a predetermined threshold.
摘要翻译： 用于在多径衰落信道中操作的直接序列扩频接收机包括具有多个耙指的耙式接收机。 每个耙指解调来自多个信道路径上的接收信号。 多个耙指的输出被组合。 每个耙指使用选择分配的延迟来同步到一个通道路径的延迟。 搜索者周期性地对接收到的信号执行频道搜索，以检测频道中最强路径的新延迟。 多个跟踪器（每个通道路径一个）调整由搜索器执行的搜索之间的选择分配的延迟。 延迟控制器可操作地耦合到搜索器和跟踪器。 延迟控制器将来自搜索器的最强路径的新延迟与选择分配的延迟进行比较，并且只有当新延迟与超过预定阈值的一个选择分配的延迟不同时，才将所选择的分配的延迟之一与新的延迟之一重新分配。
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7.发明授权Apparatus and method for selecting between a plurality of antennas utilized by a microcellular communications terminal for reception of a signal 失效用于在微蜂窝通信终端利用的用于接收信号的多个天线之间进行选择的装置和方法公开(公告)号：US06226507B1
公开(公告)日：2001-05-01
申请号：US09017829
申请日：1998-02-03
IPC分类号： H04B106
CPC分类号： H04B7/082 , H04B7/0842
摘要： An apparatus and method for selecting between a plurality of antennas utilized by a microcellular communications terminal for reception of a signal, wherein a gain imbalance exists between the antennas.
摘要翻译： 一种用于在微蜂窝通信终端利用的多个天线之间进行选择以接收信号的装置和方法，其中天线之间存在增益不平衡。
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8.发明授权Measurement techniques for diversity and inter-frequency mobile assisted handoff (MAHO) 失效用于分集和频间移动辅助切换（MAHO）的测量技术公开(公告)号：US06212368B1
公开(公告)日：2001-04-03
申请号：US09085528
申请日：1998-05-27
IPC分类号： H04B1700
CPC分类号： H04W88/02 , H04B7/0808 , H04W24/10 , H04W36/06
摘要： Diversity and inter-frequency mobile-assisted handoff (MAHO) are achieved under continuous reception cellular access methods by using strategic timing and switching optimizations. Strategic timing is achieved by avoiding the non-reception of power control bits. For example, the mobile terminal can make measurements for diversity in the last eight bits of a sub-frame of an IS-95 downlink transmission. Switching is optimized, for example, by storing rake taps for a first antenna prior to switching to a second antenna so that the rake tap positions can be restored upon returning to the first antenna. With these and other disclosed measurement techniques, the benefits of diversity and inter-frequency MAHO can be achieved in continuous reception cellular systems.
摘要翻译： 通过使用战略定时和切换优化，在连续接收蜂窝接入方式下实现分集和频间移动辅助切换（MAHO）。 通过避免电源控制位的不接收来实现战略时序。 例如，移动终端可以对IS-95下行链路传输的子帧的最后8位中的分集进行测量。 优化切换，例如，在切换到第二天线之前，通过存储用于第一天线的雷击抽头，使得在返回到第一天线时可以恢复前叉抽头位置。 利用这些和其他公开的测量技术，可以在连续接收蜂窝系统中实现分集和频间MAHO的益处。
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公开(公告)号：US6085103A
公开(公告)日：2000-07-04
申请号：US802670
申请日：1997-02-19
CPC分类号： H04B7/005
摘要： A fading compensation apparatus and method are provided in which blocks of the analog AM signal (e.g., voice) are time-compressed at a transmitter. Gaps in the time-compressed signal are filled with pilot symbols (or similar complex waveforms) having known characteristics, such as predetermined amplitudes. The time-compressed analog AM signal (e.g., SSB or VSB) is transmitted over the fading channel. At an analog AM receiver, an estimate of the fading that occurred in the transmission channel is made by observing the amplitude of the received pilot symbols at discrete points in time, and interpolating to determine the amount of fading that occurred across the total transmitted signal. A fading compensator compares the received faded time-compressed signal with the interpolation results, and adjusts the amplitude and phase of the received signal accordingly to compensate for the fading that occurred in the transmission channel. The compensated analog AM signal is time expanded and output to a user.
摘要翻译： 提供了一种衰落补偿装置和方法，其中模拟AM信号（例如，语音）的块在发射机处被时间压缩。 用时间压缩信号的间隙填充具有已知特性（例如预定幅度）的导频符号（或类似的复杂波形）。 时间压缩的模拟AM信号（例如，SSB或VSB）在衰落信道上传输。 在模拟AM接收机处，通过在离散时间点观察接收到的导频符号的幅度来进行在传输信道中发生的衰落的估计，并进行内插以确定跨总传输信号发生的衰落量。 衰落补偿器将接收到的衰落时间压缩信号与插值结果进行比较，并相应地调整接收信号的幅度和相位，以补偿在传输信道中发生的衰落。 经补偿的模拟AM信号被时间扩展并输出给用户。
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公开(公告)号：US6005887A
公开(公告)日：1999-12-21
申请号：US748755
申请日：1996-11-14
摘要： The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.
摘要翻译： 本公开提出了用于解扩直接序列扩频通信信号的许多降低的复杂度架构。 在用于序列去除单元的第一解扩架构中，根据复扩展序列的处理相位，接收的码片间隔复数样本被否定。 此外，同相和正交相位采样值根据处理相位彼此切换。 在第二解扩架构中，在序列去除单元中，在对数域中处理接收的码片间隔复数样本，其中复扩展序列的相位被加到检测相位，并且所得到的复信号然后转换回笛卡尔坐标 。 在用于相关器的第三解扩架构中，在对数域中执行序列去除和相关，其中所得复数信号的幅度和相位被算术平均，然后转换回笛卡尔坐标。 用于相关器的架构，使用循环平均在对数域中执行序列去除和相关。 在用于相关器的第五解扩架构中，其中将多个分量序列组合在一起以形成整个序列，并且其中所述多个分量序列之一由所有信道共享，提供共同的序列去除以从 所有频道 然后将所得到的信号发送到多个单独的相关器，以去除信道特定序列。
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