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公开(公告)号：US6084929A
公开(公告)日：2000-07-04
申请号：US7936
申请日：1998-01-16
申请人： Karl Molnar , Greg Bottomley , Rajaram Ramesh
发明人： Karl Molnar , Greg Bottomley , Rajaram Ramesh
IPC分类号： H04L27/01 , H04B1/707 , H04B3/04 , H04B3/06 , H04B7/005 , H04L25/02 , H04L25/03 , H04Q7/38 , H04B1/10
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： A method and apparatus for channel tracking is disclosed wherein pulse-shaping information is used to improve channel tracking performance. Information symbol values are prefiltered using the pulse shape information for a received baseband signal to generate a filtered waveform. The filtered waveform provides a reference signal for a medium response estimation. The estimated medium response is used with a coherent detector to detect unknown information symbols within the baseband signal. Medium response estimates can be determined for a single detected symbol sequence or for each hypothesized symbol sequence.
摘要翻译： 公开了一种用于信道跟踪的方法和装置，其中使用脉冲整形信息来改善信道跟踪性能。 信息符号值使用接收到的基带信号的脉冲形状信息进行过滤，以生成滤波波形。 经滤波的波形提供用于介质响应估计的参考信号。 估计的介质响应与相干检测器一起使用以检测基带信号内的未知信息符号。 可以为单个检测到的符号序列或每个假设的符号序列确定中等响应估计。
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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
公开(公告)号：US6157820A
公开(公告)日：2000-12-05
申请号：US96960
申请日：1998-06-12
IPC分类号： H04B1/7115 , H04B7/26 , H04B17/00 , H04Q7/36
CPC分类号： H04B17/318 , H04B1/7115
摘要： A method and apparatus for evaluating signal strength of a channel received at a mobile station within a spread spectrum communication systems is disclosed. If the receiver at the mobile station receives a spread spectrum signal, a first sampling means converts the received signal into a first sample stream as a first sampling. A second sampling means converts the first sample stream into a second sample stream at a second sample rate, different from the first sample rate. The signal strength of a pilot channel is measured based upon the first and second sample streams.
摘要翻译： 公开了一种用于评估在扩展频谱通信系统内在移动站处接收的信道的信号强度的方法和装置。 如果移动站处的接收机接收到扩频信号，则第一采样装置将接收到的信号转换为第一采样流作为第一采样。 第二采样装置以与第一采样率不同的第二采样率将第一采样流转换成第二采样流。 基于第一和第二采样流来测量导频信道的信号强度。
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5.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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6.发明授权Method and apparatus for digital symbol detection using medium response estimates 有权使用介质响应估计的数字符号检测方法和装置公开(公告)号：US06252918B1
公开(公告)日：2001-06-26
申请号：US09267378
申请日：1999-03-15
IPC分类号： H04B110
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。
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7.发明授权Cellular positioning system that compensates for received signal delays in positioning radio receivers 失效蜂窝定位系统，用于补偿定位无线电接收机中的接收信号延迟公开(公告)号：US06518921B1
公开(公告)日：2003-02-11
申请号：US08838027
申请日：1997-04-22
申请人： David R. Irvin , Rajaram Ramesh , Karl Molnar
发明人： David R. Irvin , Rajaram Ramesh , Karl Molnar
IPC分类号： G01S124
摘要： A positioning system locates a mobile unit by compensating for component tolerances in time-of-arrivals of received signals at a plurality of positioning radio receivers. The system determines detection times of the received radio signals at the positioning radio receivers. The system takes into account pre-stored signal delays associated with one or more receiver stages of the corresponding positioning radio receivers and the detection times, for determining time-of-arrivals for the received radio signals.
摘要翻译： 定位系统通过在多个定位无线电接收机处补偿接收到的信号的到达时间内的组件容差来定位移动单元。 该系统确定定位无线电接收机处接收的无线电信号的检测时间。 该系统考虑与相应的定位无线电接收机的一个或多个接收机级相关联的预先存储的信号延迟和检测时间，用于确定接收到的无线电信号的到达时间。
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8.发明授权Systems and methods for locating remote terminals in radiocommunication systems 失效用于定位无线电通信系统中的远程终端的系统和方法
公开(公告)号：US6040800A
公开(公告)日：2000-03-21
申请号：US839864
申请日：1997-04-22
CPC分类号： G01S5/14 , G01S5/06 , H04W4/22 , H04W76/007
摘要： Emergency call handling may, in the near future, require terminal unit location information to be provided to emergency service centers. Exemplary embodiments of the present invention provide improved techniques for using a system of monitoring or adjunct stations to provide this location information to the emergency service centers. For example, either time of arrival (TOA) or time difference of arrival (TDOA) techniques can be selectively used to process received signals and provide location information. Techniques for improving timing estimates are also disclosed.
摘要翻译： 在不久的将来，紧急呼叫处理可能需要向紧急服务中心提供终端单元位置信息。 本发明的示例性实施例提供了使用监控系统或附加站的改进技术来向紧急服务中心提供该位置信息。 例如，可以有选择地使用到达时间（TOA）或到达时差（TDOA）技术来处理接收到的信号并提供位置信息。 还公开了用于改善时序估计的技术。
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公开(公告)号：US5889827A
公开(公告)日：1999-03-30
申请号：US766167
申请日：1996-12-12
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
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10.发明授权Method and apparatus for digital symbol detection using medium response estimates 有权使用介质响应估计的数字符号检测方法和装置公开(公告)号：US06603827B2
公开(公告)日：2003-08-05
申请号：US09769995
申请日：2001-01-25
IPC分类号： H04B169
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。
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