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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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2.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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4.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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5.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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6.发明授权Communications methods, apparatus and computer program products using gain multipliers 有权使用增益乘法器的通信方法，设备和计算机程序产品公开(公告)号：US07236514B2
公开(公告)日：2007-06-26
申请号：US09968443
申请日：2001-10-01
IPC分类号： H04B1/00
CPC分类号： H04L25/0224 , H04B1/71052 , H04B1/712 , H04B7/0848 , H04B2201/709727 , H04L25/0204 , H04W52/16
摘要： A communications signal is processed to determine a proportionality relationship between a gain of a first channel (e.g., a pilot channel) and a gain of a second channel (e.g., a traffic channel) from a model of the first channel and information recovered from the second channel according to the model of the first channel. Symbol estimates may be generated from the information received over the second channel based on the determined proportionality relationship. In some embodiments, a gain multiplier may be estimated from information received over the second channel, a channel estimate for the first channel and a noise estimate for the first channel, for example, by generating despread values from the information received over the second channel, processing the despread values according to the channel estimate to generate symbol estimates, and generating the estimate of the gain multiplier from the noise estimate and the symbol estimates. Methods, apparatus and computer program products are provided.
摘要翻译： 处理通信信号以确定来自第一信道的模型的第一信道（例如，导频信道）的增益和第二信道的增益（例如，业务信道）之间的比例关系，以及从第 第二通道根据第一通道的型号。 可以基于所确定的比例关系从通过第二信道接收的信息生成符号估计。 在一些实施例中，可以通过第二信道接收的信息，第一信道的信道估计和第一信道的噪声估计来估计增益乘数，例如，通过在第二信道上接收的信息产生解扩值， 根据信道估计处理解扩值以产生符号估计，以及根据噪声估计和符号估计生成增益乘数的估计。 提供方法，仪器和计算机程序产品。
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