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1. 发明授权

US06621858B2 Flexible sliding correlator for direct sequence spread spectrum systems 有权
公开(公告)号：US06621858B2
公开(公告)日：2003-09-16
申请号：US09729524
申请日：2000-12-04
申请人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
发明人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
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.

2. 发明授权

US06363105B1 Flexible sliding correlator for direct sequence spread spectrum systems 失效
标题翻译：用于直接序列扩频系统的灵活滑动相关器
公开(公告)号：US06363105B1
公开(公告)日：2002-03-26
申请号：US09024120
申请日：1998-02-17
申请人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
发明人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
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。

3. 发明授权

US06839378B1 Method and apparatus for multipath delay estimation in direct sequence spread spectrum communication systems 失效
标题翻译：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
申请人： Essam Sourour , Greg Bottomley , Rajaram Ramesh , Sandeep Chennakeshu
发明人： Essam Sourour , Greg Bottomley , Rajaram Ramesh , Sandeep Chennakeshu
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。

4. 发明授权

US06891883B2 Delay searcher and delay trackers interaction for new delays assignment to rake fingers 有权
标题翻译：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
申请人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
发明人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
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。

5. 发明授权

US6147982A System and method for synchronizing acquisition for a code modulated communication system 失效
标题翻译：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
申请人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
发明人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
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。

6. 发明授权

US06560273B1 Delay searcher and delay trackers interaction for new delays assignment to rake fingers 有权
标题翻译：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
申请人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
发明人： Essam Sourour , Gregory E. Bottomley , Rajaram Ramesh
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。

7. 发明授权

US6157820A Pilot strength measurement and multipath delay searcher for CDMA receiver 失效
标题翻译： CDMA接收机的导频强度测量和多径延迟搜索器
公开(公告)号：US6157820A
公开(公告)日：2000-12-05
申请号：US96960
申请日：1998-06-12
申请人： Essam Abdelfattah Sourour , Greg Bottomley , Rajaram Ramesh
发明人： Essam Abdelfattah Sourour , Greg Bottomley , Rajaram Ramesh
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。

8. 发明授权

US6084929A Method and apparatus for channel tracking 失效
标题翻译：频道跟踪的方法和装置
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。

9. 发明授权

US08538464B2 Code word assignment methods for quick paging in telecommunication systems 有权
标题翻译：电信系统快速寻呼的码字分配方法
公开(公告)号：US08538464B2
公开(公告)日：2013-09-17
申请号：US12346286
申请日：2008-12-30
申请人： Rajaram Ramesh , Havish Koorapaty , Kumar Balachandran
发明人： Rajaram Ramesh , Havish Koorapaty , Kumar Balachandran
IPC分类号： H04W68/00
CPC分类号： H04W68/02 , H04W4/08 , H04W72/0466
摘要： Code words are assigned to subscriber stations or groups of subscriber stations in a communication network for a quick paging mechanism in which the assigned code words are transmitted as quick paging signals over unused frequency resources to signal the subscriber stations. Subsets of multiple code words from a set of code words can be assigned to respective paging groups, and overlapping subsets can be assigned to multiple paging groups. This enables a single code word to be used to address either a single paging group or multiple paging groups.
摘要翻译：代码字被分配给通信网络中的订户站或用户站组，用于快速寻呼机制，其中分配的码字作为快速寻呼信号在未使用的频率资源上发送，以向用户台发信号。可以将来自一组码字的多个码字的子集分配给各个寻呼组，并且可以将重叠的子集分配给多个寻呼组。这使得能够使用单个代码字来寻址单个寻呼组或多个寻呼组。

10. 发明授权

US08144720B2 Uplink radio resource allocation in the presence of power limited users 有权
标题翻译：在电力限制用户面前上行无线电资源分配
公开(公告)号：US08144720B2
公开(公告)日：2012-03-27
申请号：US12429468
申请日：2009-04-24
申请人： Havish Koorapaty , Rajaram Ramesh , Kumar Balachandran
发明人： Havish Koorapaty , Rajaram Ramesh , Kumar Balachandran
IPC分类号： H04Q11/02
CPC分类号： H04L49/9094 , H04L1/0003 , H04L1/0009 , H04L5/0007 , H04L5/0042 , H04L5/0046 , H04L5/006 , H04L43/0894 , H04L43/16 , H04L47/70 , H04L47/74 , H04L47/781 , H04W28/065 , H04W28/22 , H04W72/044 , H04W72/048 , H04W72/12 , Y02D70/146
摘要： A base station in an OFDMA system which determines a modulation and coding scheme to use for a packet of a certain size to be transmitted by a Mobile Station. The base station schedules transmissions by mobile stations and transmits packets. The base station includes a processing unit which determines a number of time-frequency resources required to transmit the packet for a modulation and coding scheme, determines an SINR based on the number of time-frequency resources used and available power at the mobile station, determines a transmission rate as a ratio of the packet size transmitted to the number of time-frequency resources used, sets a rate to zero if the determined SINR is lower than a threshold SINR required for the modulation and coding scheme, and selects the modulation and coding scheme with a highest transmission rate. The base station includes a memory storing modulation and coding schemes.
摘要翻译： OFDMA系统中的基站，其确定用于要由移动站发送的一定大小的分组的调制和编码方案。基站调度移动台的传输并发送分组。基站包括：处理单元，其确定用于调制和编码方案发送分组所需的时间频率资源的数量;基于所使用的时间频率资源的数量和移动站的可用功率来确定SINR，确定如果发送的分组大小与使用的时间 - 频率资源的数量的比率的传输速率，则如果确定的SINR低于调制和编码方案所需的阈值SINR，则将速率设置为零，并且选择调制和编码传输速率最高的方案。基站包括存储调制和编码方案的存储器。

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