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1. 发明申请

US20110158293A1 NOISE AND CHANNEL ESTIMATION USING LOW SPREADING FACTORS 有权
标题翻译：噪声和通道估计使用低扩张因子
公开(公告)号：US20110158293A1
公开(公告)日：2011-06-30
申请号：US13046199
申请日：2011-03-11
申请人： Da-Shan Shiu , Durga Prasad Malladi , Srikrishna Bhashyam
发明人： Da-Shan Shiu , Durga Prasad Malladi , Srikrishna Bhashyam
IPC分类号： H04B1/707 , H04B3/46
CPC分类号： H04B1/1027 , H04B1/7097 , H04L1/20 , H04L25/0228
摘要： Noise measurements are made within a fraction of a single symbol period of a longest orthogonal code symbol. A control processor identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader measures symbol energy based on the unoccupied code and a noise estimator generates noise estimations based on the measured symbol energies. The subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code
摘要翻译：在最长正交码符号的单个符号周期的一小部分内进行噪声测量。控制处理器识别具有小于系统的最长扩展因子的扩展因子的未占用代码。解扩器基于未占用的代码来测量符号能量，并且噪声估计器基于测量的符号能量产生噪声估计。订户站使用类似的技术，以便在作为最长扩展因子码的符号周期的一部分的周期内执行信道估计

2. 发明授权

US08514909B2 Noise and channel estimation using low spreading factors 有权
标题翻译：噪声和信道估计使用低扩频因子
公开(公告)号：US08514909B2
公开(公告)日：2013-08-20
申请号：US13046199
申请日：2011-03-11
申请人： Da-Shan Shiu , Durga Malladi Prasad , Srikrishna Bhashyam
发明人： Da-Shan Shiu , Durga Malladi Prasad , Srikrishna Bhashyam
IPC分类号： H04B1/00
CPC分类号： H04B1/1027 , H04B1/7097 , H04L1/20 , H04L25/0228
摘要： Noise measurements are made within a fraction of a single symbol period of a longest orthogonal code symbol. A control processor identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader measures symbol energy based on the unoccupied code and a noise estimator generates noise estimations based on the measured symbol energies. The subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code.
摘要翻译：在最长正交码符号的单个符号周期的一小部分内进行噪声测量。控制处理器识别具有小于系统的最长扩展因子的扩展因子的未占用代码。解扩器基于未占用的代码来测量符号能量，并且噪声估计器基于所测量的符号能量产生噪声估计。订户站使用类似的技术，以便在作为最长扩展因子码的符号周期的一部分的周期内执行信道估计。

3. 发明授权

US08355685B2 Segmented CDMA searching 有权
公开(公告)号：US08355685B2
公开(公告)日：2013-01-15
申请号：US11746031
申请日：2007-05-08
申请人： Subramanya P. Rao , Da-Shan Shiu , Jeremy H. Lin , Jeong Geun Kim
发明人： Subramanya P. Rao , Da-Shan Shiu , Jeremy H. Lin , Jeong Geun Kim
IPC分类号： H04B1/18 , H04B1/16
CPC分类号： H04B1/7077 , H04B1/70753 , H04B2201/70707
摘要： Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information for one of the plurality of search tasks. In another aspect, a first search task is interrupted in progress, the state information for the first task is stored, a second search task is performed, and the first search task is continued using the stored state information. In yet another aspect, a search task is segmented into smaller search segments, sized to fit within contiguous available time in the searcher. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

4. 发明授权

US06798826B1 Method and apparatus for performing reverse rate matching in a CDMA system 有权
标题翻译：用于在CDMA系统中执行反向速率匹配的方法和装置
公开(公告)号：US06798826B1
公开(公告)日：2004-09-28
申请号：US09707349
申请日：2000-11-06
申请人： Da-Shan Shiu , Avneesh Agrawal
发明人： Da-Shan Shiu , Avneesh Agrawal
IPC分类号： H04B1707
CPC分类号： H04L1/0071 , H04L1/0045 , H04L1/0067
摘要： Techniques for processing symbols received for a (transport) channel in a (W-CDMA) communication system. According to the W-CDMA standard, the coded bits of a transport channel are first rate-matched, then first de-interleaved, and then segmented to form X radio frames, where X is the transmission time interval (TTI) of the transport channel. The radio frames can be processed in various manners. In one aspect, the rate-matching and first interleaving can be applied to the coded bits of the transport channel X times to generate a radio frame with each application. In accordance with a method, the correspondence between the coded bit xm and the rate-matched bits yn, and between the rate-matched bits yn and the interleaved bits zk, can be computed based on direct or iterative computations. In another aspects, the first de-interleaving and inverse rate-matching can be applied onto each rad it is received, without having to wait for the remaining radio frames in the TTI to be received. The correspondences between the received symbols zk′, de-interleaved symbols yn′ and de-rate-matched symbols xm′ can be computed. Reduced buffering requirement and reduced processing delays may be achieved based on the above.
摘要翻译：用于处理（W-CDMA）通信系统中为（传输）信道接收的符号的技术。根据W-CDMA标准，传输信道的编码比特首先进行速率匹配，然后首先解交织，然后分段形成X个无线帧，其中X是传输信道的传输时间间隔（TTI）。无线电帧可以以各种方式进行处理。在一个方面，速率匹配和第一交织可以被应用于传输信道X的编码比特，以产生每个应用的无线帧。根据一种方法，可以基于直接或迭代计算来计算编码比特xm和速率匹配比特yn之间以及速率匹配比特yn和交织比特zk之间的对应关系。在另一方面，可以将第一解交织和反比特率匹配应用于其接收的每个弧度上，而不必等待接收到TTI中的剩余无线电帧。可以计算接收符号zk'，解交织符号yn'和解速率匹配符号xm'之间的对应关系。基于上述可以实现减少缓冲要求和减少的处理延迟。

5. 发明授权

US07966032B2 Power control avoiding outer loop wind-up 有权
标题翻译：电源控制避免外圈卷绕
公开(公告)号：US07966032B2
公开(公告)日：2011-06-21
申请号：US11264950
申请日：2005-11-01
申请人： Richard Chi , Da-Shan Shiu , Nitin Kasturi , Parvathanathan Subrahmanya
发明人： Richard Chi , Da-Shan Shiu , Nitin Kasturi , Parvathanathan Subrahmanya
IPC分类号： H04Q7/20
CPC分类号： H04W52/228 , H04W52/12 , H04W52/20 , H04W52/221 , H04W52/24 , H04W52/241 , H04W52/248 , H04W52/36
摘要： Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.
摘要翻译：公开了避免外圈卷绕的功率控制技术。在一个方面，检测目标功率电平的上升，并且响应地改变目标功率电平。在另一方面，检测目标功率电平的展开，之后在不考虑卷绕的情况下确定目标功率电平。还提出了各种其他方面，包括卷绕和展开检测程序以及目标功率级别修改程序。这些方面具有减少发射功率超过必要时间的优点，从而增加系统容量和性能，并减轻系统资源的分配不当。

6. 发明授权

US07734309B2 Power control avoiding outer loop wind-up 有权
标题翻译：电源控制避免外圈卷绕
公开(公告)号：US07734309B2
公开(公告)日：2010-06-08
申请号：US11750938
申请日：2007-05-18
申请人： Richard Chi , Da-Shan Shiu , Nitin Kasturi , Parvathanathan Subrahmanya
发明人： Richard Chi , Da-Shan Shiu , Nitin Kasturi , Parvathanathan Subrahmanya
IPC分类号： H04Q7/20
CPC分类号： H04W52/228 , H04W52/12 , H04W52/20 , H04W52/221 , H04W52/24 , H04W52/241 , H04W52/248 , H04W52/36
摘要： Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.
摘要翻译：公开了避免外圈卷绕的功率控制技术。在一个方面，检测目标功率电平的上升，并且响应地改变目标功率电平。在另一方面，检测目标功率电平的展开，之后在不考虑卷绕的情况下确定目标功率电平。还提出了各种其他方面，包括卷绕和展开检测程序以及目标功率级别修改程序。这些方面具有减少发射功率超过必要时间的优点，从而增加系统容量和性能，并减轻系统资源的分配不当。

7. 发明申请

US20070298739A1 SEGMENTED CDMA SEARCHING 有权
标题翻译： SEGMENTED CDMA搜索
公开(公告)号：US20070298739A1
公开(公告)日：2007-12-27
申请号：US11746031
申请日：2007-05-08
申请人： Subramanya Rao , Da-Shan Shiu , Jeremy Lin , Jeong Kim
发明人： Subramanya Rao , Da-Shan Shiu , Jeremy Lin , Jeong Kim
IPC分类号： H04B1/18
CPC分类号： H04B1/7077 , H04B1/70753 , H04B2201/70707
摘要： Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information for one of the plurality of search tasks. In another aspect, a first search task is interrupted in progress, the state information for the first task is stored, a second search task is performed, and the first search task is continued using the stored state information. In yet another aspect, a search task is segmented into smaller search segments, sized to fit within contiguous available time in the searcher. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.
摘要翻译：公开了分段CDMA搜索的技术。在一个方面，搜索器包括可选择用于执行多个可分割搜索任务的多个存储元件，每个存储元件可操作用于存储和访问多个搜索任务之一的状态信息。在另一方面，第一搜索任务在进行中中断，存储第一任务的状态信息，执行第二搜索任务，并且使用所存储的状态信息继续第一搜索任务。在另一方面，搜索任务被分割成较小的搜索段，其大小适合于搜索者中的连续可用时间。还提出了本发明的各种其它方面。这些方面具有电路面积和搜索时间效率的优点，从而降低了成本，增加了待机时间，提高了采集速度，提高了信号传输质量，提高了数据吞吐量，降低了功耗，提高了整体系统容量。

8. 发明授权

US06744747B2 Method & apparatus for W-CDMA handoff searching 有权
标题翻译： W-CDMA切换搜索的方法与装置
公开(公告)号：US06744747B2
公开(公告)日：2004-06-01
申请号：US09935505
申请日：2001-08-22
申请人： Da-Shan Shiu , Parvathanathan Subrahmanya , Subramanya P.N. Rao
发明人： Da-Shan Shiu , Parvathanathan Subrahmanya , Subramanya P.N. Rao
IPC分类号： H04Q700
CPC分类号： H04B1/7083 , H04B2201/70701 , H04B2201/70702 , H04W36/00 , H04W48/16 , Y02D70/40
摘要： Techniques for improved handoff searching in asynchronous systems, such as W-CDMA, are disclosed. In one aspect, a two-step search procedure is used when a list of neighbor codes is known. In the first step, a received signal is correlated with a slot timing code to locate on or more pilots and the slot boundaries associated therewith. In the second step, the received signal is correlated with each of the list of codes at the slot boundaries identified with pilots in the first step to identify the pilot code and the frame timing associated with each pilot. Various other aspects of the invention are also presented. These aspects have the benefit of decreasing search time, which translates to increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.
摘要翻译：公开了用于在诸如W-CDMA之类的异步系统中改进切换搜索的技术。在一个方面，当已知邻居码列表时，使用两步搜索过程。在第一步骤中，接收的信号与时隙定时码相关联，以定位或多于其上的导频和与其相关联的时隙边界。在第二步骤中，接收到的信号与在第一步骤中用导频识别的时隙边界上的每个代码列表相关联，以识别与每个导频相关联的导频码和帧定时。还提出了本发明的各种其它方面。这些方面具有减少搜索时间的优点，这意味着增加的采集速度，更高质量的信号传输，增加的数据吞吐量，降低的功率以及整体系统容量的提高。

9. 发明授权

US08014473B2 Method and apparatus for detecting messages with unknown signaling characteristic 有权
标题翻译：用于检测具有未知信令特性的消息的方法和装置
公开(公告)号：US08014473B2
公开(公告)日：2011-09-06
申请号：US09834135
申请日：2001-04-12
申请人： Richard Chi , Da-Shan Shiu
发明人： Richard Chi , Da-Shan Shiu
IPC分类号： H04L27/06
CPC分类号： H04B1/7103 , H04B2201/70705 , H04L25/0262 , H04L25/03171
摘要： Techniques for detecting received sequences when certain signaling characteristics (e.g., transport formats, rates) are not known a priori at the receiver. In one method, a sequence for a transmitted message is received, and a metric value is computed for each of a number of hypothesized messages corresponding to a number of hypotheses for the unknown signaling characteristic of the transmitted message. The metric value is computed based on a MAP metric derived to approximately maximize a joint a posteriori probability between the received sequence and the hypothesized messages. The hypothesized message having the best metric value is selected as the transmitted message. The specific form of the MAP metric is dependent on the particular signaling scheme used to map the message to its corresponding sequence, and may be used for blind transport format detection (BTFD) in a W-CDMA system and blind rate detection in an IS-95 CDMA system.
摘要翻译：当某些信令特征（例如，传输格式，速率）在接收机处不知道时，用于检测接收到的序列的技术。在一种方法中，接收用于发送的消息的序列，并且针对与发送的消息的未知信令特性的假设数量相对应的多个假设消息中的每一个计算度量值。基于导出的MAP度量计算度量值，以近似地使接收到的序列与假设消息之间的联合后验概率最大化。选择具有最佳度量值的假设消息作为发送消息。 MAP度量的具体形式取决于用于将消息映射到其对应序列的特定信令方案，并且可以用于W-CDMA系统中的盲传输格式检测（BTFD），并且在IS- 95 CDMA系统。

10. 发明授权

US06765887B1 Method and apparatus for processing a received transmission based on processing delays requirement 有权
标题翻译：基于处理延迟要求处理接收的传输的方法和装置
公开(公告)号：US06765887B1
公开(公告)日：2004-07-20
申请号：US09657220
申请日：2000-09-06
申请人： Da-Shan Shiu , Avneesh Agrawal , Daisuke Terasawa
发明人： Da-Shan Shiu , Avneesh Agrawal , Daisuke Terasawa
IPC分类号： H04Q700
CPC分类号： H04W28/18 , H04B7/2628
摘要： Techniques for processing transmissions in a communications (e.g., CDMA) system. Samples are received and assembled into one or more traffics, with each traffic including one or more portions (e.g., radio frames, coded blocks) suitable for processing independently. The priority of each portion is determined based on its processing delays requirement, which can be estimated based on, for example, the time interval over which the samples in the traffic are interleaved, the processing deadline, and so on. A portion in a traffic having the highest priority is selected and scheduled for processing. The processing can include reordering the samples in the selected portion in accordance with a particular reordering scheme, accumulating redundant samples and inserting place holders (e.g., don't cares) for deleted samples in the selected portion, and decoding the reordered samples in the selected portion. The processing of the traffic may be interrupted, in which case the state information related to the processing of the interrupted traffic is saved. A portion in another traffic can then be selected and scheduled for processing. Thereafter, the processing on the interrupted traffic can be resumed using the saved state information.
摘要翻译：用于在通信（例如，CDMA）系统中处理传输的技术。样本被接收并组装成一个或多个业务，每个业务包括一个或多个适合独立处理的部分（例如，无线电帧，编码块）。每个部分的优先级基于其处理延迟要求来确定，该处理延迟要求可以基于例如业务中的样本交错的时间间隔，处理期限等来估计。具有最高优先级的流量中的一部分被选择并被调度用于处理。该处理可以包括根据特定的重排序方案重新排序所选部分中的样本，累积冗余样本并插入所选部分中被删除样本的占位符（例如，不关心），以及对所选择的部分中的重排序样本进行解码一部分。流量的处理可能被中断，在这种情况下，与处理中断流量相关的状态信息被保存。然后可以选择和调度另一个业务中的一部分进行处理。此后，可以使用保存的状态信息恢复对中断业务的处理。

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