专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

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

US06567483B1 Matched filter using time-multiplexed precombinations 有权
标题翻译：匹配滤波器使用时分复用预组合
公开(公告)号：US06567483B1
公开(公告)日：2003-05-20
申请号：US09345409
申请日：1999-07-01
申请人： Paul W. Dent , Clarence V. Roberts
发明人： Paul W. Dent , Clarence V. Roberts
IPC分类号： H03D100
CPC分类号： G06F17/15 , H03H17/0254 , H04B1/70751 , H04B1/70752 , H04B1/7093 , H04B2201/70707
摘要： A technique for correlating a stream of signal sample values with a predetermined binary code having a plurality of binary code bits is disclosed. The technique is realized by forming precombinations of groups of the signal sample values in the stream, and then temporally ordering the precombinations. Particular ones of the temporally ordered precombinations are selected based upon particular combinations of the plurality of binary code bits. The particular selected ones of the temporally ordered precombinations are then combined to form a correlation.
摘要翻译：公开了一种用于将信号采样值流与具有多个二进制码位的预定二进制码进行相关的技术。该技术通过在流中形成信号样本值的组的预组合，然后在时间上排序预组合来实现。基于多个二进制码位的特定组合来选择时间有序的预组合中的特定的组合。然后将时间有序的预组合中的特定选定的组合形成相关性。

4. 发明申请

US20080126612A1 DMAC to Handle Transfers of Unknown Lengths 有权
标题翻译： DMAC处理未知长度的转移
公开(公告)号：US20080126612A1
公开(公告)日：2008-05-29
申请号：US11563732
申请日：2006-11-28
申请人： David E. Barrow , Clarence V. Roberts
发明人： David E. Barrow , Clarence V. Roberts
IPC分类号： G06F13/18
CPC分类号： G06F13/28
摘要： A DMA controller maintains a count of data transferred in each DMA operation, and saves the transferred data count at the end of the DMA operation. The DMA controller may then begin a subsequent DMA transfer operation, without waiting for a processor to read the transferred data count. The transferred data count may be written to memory at an address specified in a transferred data count save address register; may be saved to a transferred data count register dedicated to the DMA channel; or may be saved to a transferred data count register shared between two or more DMA channels. The processor may read the transferred data count and, if applicable, clear the relevant transfer data count register, subsequent to the DMA controller beginning another DMA operation on that DMA channel.
摘要翻译： DMA控制器维护每个DMA操作中传输的数据计数，并在DMA操作结束时保存传输的数据计数。然后，DMA控制器可以开始后续的DMA传输操作，而不必等待处理器读取传送的数据计数。传送的数据计数可以以传送的数据计数保存地址寄存器中指定的地址写入存储器; 可以保存到专用于DMA通道的传送数据计数寄存器; 或者可以将其保存到两个或多个DMA通道之间共享的传送数据计数寄存器。处理器可以在DMA控制器开始DMA通道上的另一个DMA操作之后，读取传送的数据计数，如果适用，清除相关的传输数据计数寄存器。

5. 发明授权

US06377615B1 Apparatus and methods for receiving information using variable length accumulation searchers 有权
标题翻译：使用可变长度累积搜索器接收信息的装置和方法
公开(公告)号：US06377615B1
公开(公告)日：2002-04-23
申请号：US09408624
申请日：1999-09-30
申请人： Essam A. Sourour , Clarence V. Roberts
发明人： Essam A. Sourour , Clarence V. Roberts
IPC分类号： A61F206
CPC分类号： H04B1/70775 , H04B1/70751 , H04B1/70752 , H04B1/70754 , H04B1/709 , H04B1/711 , H04B1/7117
摘要： Delays in a spread spectrum signal transmitted in a communications medium according to a spreading sequence may be determined by receiving a composite signal including the spread spectrum signal from the communications medium. The composite signal is correlated with the spreading sequence according to a first correlation length, to produce first time-offset correlations of the composite signal with the spreading sequence. Selected ones of the first time-offset correlations of the composite signal then are further correlated with the spreading sequence according to a second correlation length that is longer than the first correlation length, to produce second time-offset correlations of the composite signal with the spreading sequence. At least one of the second time-offset correlations may be selected. By providing variable length accumulation searchers, power and/or processing time can be saved by performing limited correlations for those delays that do not appear to be qualified candidates to be ultimately selected.
摘要翻译：根据扩展顺序在通信介质中发送的扩频信号中的延迟可以通过从通信介质接收包括扩频信号的复合信号来确定。复合信号根据第一相关长度与扩展序列相关，以产生复合信号与扩展序列的第一时间偏移相关。然后，复合信号的第一时间偏移相关中的选定的一个与扩展序列进一步相关，该扩展序列根据长于第一相关长度的第二相关长度，以产生复合信号与扩展的第二时间偏移相关序列。可以选择第二时间偏移相关中的至少一个。通过提供可变长度累积搜索器，可以通过对那些似乎不被最终选择的合格候选者的延迟执行有限的相关性来节省功率和/或处理时间。

6. 发明授权

US06212398B1 Wireless telephone that rapidly reacquires a timing reference from a wireless network after a sleep mode 有权
标题翻译：无线电话在休眠模式之后迅速地从无线网络重新获取定时参考
公开(公告)号：US06212398B1
公开(公告)日：2001-04-03
申请号：US09205535
申请日：1998-12-03
申请人： Clarence V. Roberts , Raymond C. Henry, Jr.
发明人： Clarence V. Roberts , Raymond C. Henry, Jr.
IPC分类号： H04Q732
CPC分类号： H04B1/1615 , H04W52/0229 , H04W52/0245 , H04W52/0293 , Y02D70/164 , Y02D70/40
摘要： A method for rapidly reacquiring a timing reference after a sleep period in a wireless telephone receiving pilot signals from one or more base stations in a wireless network, wherein the wireless telephone has a master timer (local time reference), a fast, accurate clock source, a slow, less accurate but power efficient clock source and a memory. The method includes the steps of entering the sleep period by storing one or more parameters related to the pilot signals and how the pilot signals are changing over time, calculating a prediction of the parameters of the pilot signals after a sleep period based on the stored parameters, storing the prediction, starting the slow clock, and stopping the master timer (local time reference) and fast clock source. The method further includes the steps of ending the sleep period by generating a wake-up interrupt by the slow clock after the sleep period, restarting the master timer and fast clock source responsive to the wake-up interrupt, and reacquiring pilot signals using the predictions stored previously. A time correction factor can then be computed that closely aligns the received pilot signals on the prediction which is then weighted and the master timer is adjusted by the weighted time correction.
摘要翻译：一种用于在从无线网络中的一个或多个基站接收导频信号的无线电话中在睡眠周期之后快速重新获取定时参考的方法，其中所述无线电话具有主定时器（本地时间基准），快速准确的时钟源，一个缓慢，不太准确但功耗高的时钟源和内存。该方法包括以下步骤：通过存储与导频信号相关的一个或多个参数以及导频信号如何随时间变化来进入睡眠周期，基于所存储的参数来计算睡眠周期之后的导频信号的参数的预测，存储预测，启动慢时钟，并停止主机定时器（本地时间基准）和快速时钟源。该方法还包括以下步骤：通过在睡眠周期之后由慢时钟产生唤醒中断来终止睡眠周期，响应于唤醒中断重新启动主定时器和快速时钟源，以及使用预测重新获取导频信号以前存储。然后可以计算时间校正因子，其将所接收的导频信号对预测进行紧密对准，然后加权，并且通过加权时间校正来调整主定时器。

7. 发明授权

US07433977B2 DMAC to handle transfers of unknown lengths 有权
标题翻译： DMAC处理未知长度的传输
公开(公告)号：US07433977B2
公开(公告)日：2008-10-07
申请号：US11563732
申请日：2006-11-28
申请人： David E. Barrow , Clarence V. Roberts
发明人： David E. Barrow , Clarence V. Roberts
IPC分类号： G06F13/28 , G06F13/00
CPC分类号： G06F13/28
摘要： A DMA controller maintains a count of data transferred in each DMA operation, and saves the transferred data count at the end of the DMA operation. The DMA controller may then begin a subsequent DMA transfer operation, without waiting for a processor to read the transferred data count. The transferred data count may be written to memory at an address specified in a transferred data count save address register; may be saved to a transferred data count register dedicated to the DMA channel; or may be saved to a transferred data count register shared between two or more DMA channels. The processor may read the transferred data count and, if applicable, clear the relevant transfer data count register, subsequent to the DMA controller beginning another DMA operation on that DMA channel.
摘要翻译： DMA控制器维护每个DMA操作中传输的数据计数，并在DMA操作结束时保存传输的数据计数。然后，DMA控制器可以开始后续的DMA传输操作，而不必等待处理器读取传送的数据计数。传送的数据计数可以以传送的数据计数保存地址寄存器中指定的地址写入存储器; 可以保存到专用于DMA通道的传送数据计数寄存器; 或者可以将其保存到两个或多个DMA通道之间共享的传送数据计数寄存器。处理器可以在DMA控制器开始DMA通道上的另一个DMA操作之后，读取传送的数据计数，如果适用，清除相关的传输数据计数寄存器。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式