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

US6154455A Prioritizing pilot set searching for a CDMA telecommunications system 失效
标题翻译：优先级搜索CDMA电信系统的导频集
公开(公告)号：US6154455A
公开(公告)日：2000-11-28
申请号：US998171
申请日：1997-12-24
申请人： Ajith Mekkoth , Darin Yeoman , Adam Gould , Joe Dowling
发明人： Ajith Mekkoth , Darin Yeoman , Adam Gould , Joe Dowling
IPC分类号： H04W48/16 , H04J13/00
CPC分类号： H04W48/16
摘要： This invention teaches methods, and circuits that operate in accordance with the methods, for improving the management and control of pilot channel sets for a CDMA mobile station. In one aspect a Priority Neighbor Search technique is provided, wherein a list of Priority Neighbor pilot channels is maintained and searched with a higher priority than the Neighbor Set pilot channels. In a further aspect this invention provides a Dropped Pilot Channel Search technique wherein a set is made of the last pilot channel or pilot channels dropped from the Active Set, wherein the dropped pilot channels are searched for some period of time with a higher priority than the Neighbor Set pilot channels. This invention also provides a High Priority Search Set feature which includes members of the Active Set, the Candidate Set, the Dropped Pilot Set, and the Priority Neighbor Set.
摘要翻译：本发明教导了根据该方法操作的方法和电路，用于改进CDMA移动台的导频信道集的管理和控制。在一个方面，提供了一种优先级邻居搜索技术，其中以比邻居集导频信道更高的优先级来维护和搜索优先级邻居导频信道的列表。在另一方面，本发明提供了一种丢弃的导频信道搜索技术，其中一组由从活动集中丢弃的最后导频信道或导频信道组成，其中所述丢弃的导频信道被搜索一段时间，优先级高于邻居设置导频信道。本发明还提供了一种高优先级搜索集特征，其包括活动集，候选集，丢弃的导频集和优先级邻居集的成员。

2. 发明授权

US07551664B2 Iterative and turbo-based method and apparatus for equalization of spread-spectrum downlink channels 有权
标题翻译：用于扩频下行链路信道均衡的迭代和基于turbo的方法和装置
公开(公告)号：US07551664B2
公开(公告)日：2009-06-23
申请号：US10943565
申请日：2004-09-17
申请人： Jianzhong (Charlie) Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
发明人： Jianzhong (Charlie) Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
IPC分类号： H04B1/00
CPC分类号： H04L1/005 , H04B1/7115 , H04L2025/03509
摘要： A system, terminal, receiver and method are provided for receiving and processing a signal received from a spread-spectrum downlink channel. The method includes receiving the signal from the downlink channel, and generating an estimate of a transmitted chip sequence in accordance with an iterative process. In this regard, the iterative process includes calculating statistical information, such as a mean and covariance, for a previous iteration of a transmitted chip sequence, the statistical information being selectively calculated based upon one of soft bits and soft symbols associated with the previous iteration of the transmitted chip sequence. The estimate for a current iteration of the chip sequence is then generated based upon the statistical information.
摘要翻译：提供了一种用于接收和处理从扩频下行链路信道接收的信号的系统，终端，接收机和方法。该方法包括从下行链路信道接收信号，并根据迭代过程产生发射码片序列的估计。在这一点上，迭代过程包括计算对于所发送的码片序列的先前迭代的诸如均值和协方差的统计信息，所述统计信息是基于与先前迭代的软比特和软符号中的一个有选择地计算的传输的码片序列。然后基于统计信息生成芯片序列的当前迭代的估计。

3. 发明申请

US20050057359A1 Transmitter unit and control unit 审中-公开
标题翻译：变送器单元和控制单元
公开(公告)号：US20050057359A1
公开(公告)日：2005-03-17
申请号：US10918211
申请日：2004-08-12
申请人： Conor Coffey , Sean Coffey , Joe Dowling
发明人： Conor Coffey , Sean Coffey , Joe Dowling
IPC分类号： G08B21/02 , G08B1/08
CPC分类号： G08B21/0202
摘要： Methods and apparatus that implement a transmitter unit and a control unit to alert a user if the control unit is beyond a limited range of communications. A method of alerting a user that a transmitter unit is beyond a limited range of communicating wirelessly with a control unit may include, wirelessly transmitting a radio frequency signal from the transmitter unit to the control unit, determining at the control unit whether the transmitter unit is beyond the limited range of wireless communications, and selectively generating an alert at the control unit based on a result of the determination. Determining at the control unit whether the transmitter unit is beyond the limited range of wireless communications may include detecting an occurrence of a predetermined condition.
摘要翻译：实现发射机单元和控制单元的方法和装置，用于警告用户，如果控制单元超出有限的通信范围。一种向用户通知发射机单元超出与控制单元进行无线通信的有限范围的方法可以包括：将无线电频率信号从发射机单元传输到控制单元，在控制单元处确定发射机单元是否是超出无线通信的有限范围，并且基于确定的结果在控制单元处选择性地生成警报。在控制单元处确定发射机单元是否超出无线通信的有限范围可以包括检测预定条件的发生。

4. 发明申请

US20060062283A1 Iterative and turbo-based method and apparatus for equalization of spread-spectrum downlink channels 有权
公开(公告)号：US20060062283A1
公开(公告)日：2006-03-23
申请号：US10943565
申请日：2004-09-17
申请人： Jianzhong Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
发明人： Jianzhong Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04L1/005 , H04B1/7115 , H04L2025/03509
摘要： A system, terminal, receiver and method are provided for receiving and processing a signal received from a spread-spectrum downlink channel. The method includes receiving the signal from the downlink channel, and generating an estimate of a transmitted chip sequence in accordance with an iterative process. In this regard, the iterative process includes calculating statistical information, such as a mean and covariance, for a previous iteration of a transmitted chip sequence, the statistical information being selectively calculated based upon one of soft bits and soft symbols associated with the previous iteration of the transmitted chip sequence. The estimate for a current iteration of the chip sequence is then generated based upon the statistical information.

5. 发明授权

US6009129A Device and method for detection and reduction of intermodulation distortion 失效
标题翻译：用于检测和减少互调失真的装置和方法
公开(公告)号：US6009129A
公开(公告)日：1999-12-28
申请号：US808601
申请日：1997-02-28
申请人： Thomas J. Kenney , Ilkka Niva , Steven D. Gray , Joe Dowling
发明人： Thomas J. Kenney , Ilkka Niva , Steven D. Gray , Joe Dowling
IPC分类号： H04B1/10
CPC分类号： H04B1/7102 , H04B1/1027
摘要： In the front end of a CDMA cellular or broadband PCS mobile phone receiver, a switched bypass connection is provided to bypass the low noise amplifier, sending the received signal through an amplifier bypass connection. The amplifier bypass connection may include an attenuator. The switched bypass is activated by a control signal generated by a digital signal processor. The digital signal processor analyzes the received signal to detect and determine the relative contribution of the IMD interference to the total received signal power and, when the IMD interference exceeds a predetermined level, sends a control signal to bypass the low noise amplifier. Identification of the presence of IMD interference is by spectral estimation to discern when the mobile phone is in the presence of large near-band signals from an AMPS or other narrow-band base station which causes in-band IMD. In a preferred embodiment, the spectral estimation is performed by collecting a series of data samples from the received signal and, using a digital signal processor (DSP), computing a Discrete Fourier Transform (DFT) to generate frequency domain data, passing the data through a filter bank, then using a decision algorithm to determine whether or not there is sufficient IMD present in the received signal to bypass the LNA. If the IMD level is high enough to warrant bypass of the LNA, the DSP will provide a signal to an automatic gain control (AGC) block for controlling a variable gain amplifier (VGA) to compensate for gain loss due to bypass of the LNA.
摘要翻译：在CDMA蜂窝或宽带PCS移动电话接收机的前端，提供开关旁路连接以绕过低噪声放大器，通过放大器旁路连接发送接收的信号。放大器旁路连接可以包括衰减器。开关旁路由数字信号处理器产生的控制信号激活。数字信号处理器分析接收到的信号以检测并确定IMD干扰对总接收信号功率的相对贡献，并且当IMD干扰超过预定电平时，发送控制信号以绕过低噪声放大器。识别IMD干扰的存在是通过频谱估计来识别当移动电话在存在来自AMPS或其他导致带内IMD的其他窄带基站的大的近带信号的情况下。在优选实施例中，通过从接收到的信号收集一系列数据采样来执行频谱估计，并且使用数字信号处理器（DSP），计算离散傅立叶变换（DFT）来产生频域数据，将数据传递通过滤波器组，然后使用判定算法来确定接收到的信号中是否存在足够的IMD以绕过LNA。如果IMD电平足够高以保证LNA的旁路，则DSP将为自动增益控制（AGC）模块提供一个信号，用于控制可变增益放大器（VGA），以补偿由于LNA旁路引起的增益损失。

6. 发明授权

US07443909B2 Weighted autocorrelation method for downlink CDMA LMMSE equalizers 有权
标题翻译：下行CDMA LMMSE均衡器的加权自相关方法
公开(公告)号：US07443909B2
公开(公告)日：2008-10-28
申请号：US11020055
申请日：2004-12-21
申请人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
发明人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04B1/71052 , H04B1/71055
摘要： Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by passing block-wise autocorrelation slides through a filter. Each autocorrelation slide is an autocorrelation matrix estimated from a short block of observed data over which the channel can be considered constant. This method achieves a reliable estimate for the autocorrelation matrix when the block size must be small to ensure that the block-wise stationarity assumption holds in cases of fast fading channels. In addition, small block sizes make it possible to satisfy the equalizer delay constraint imposed by hardware and certain voice transmission standards such as CDMA2000 1X where demodulated data must be delivered within only several symbol periods of the signal arrival time.
摘要翻译：通过更新块自适应线性最小均方误差（LMMSE）下行链路CDMA均衡器，在更高的接收机速度下，在快衰落环境中接收下行链路CDMA信号。观察数据的自相关矩阵通过通过滤波器的块自相关滑块来更新。每个自相关幻灯片是从观测数据的短块估计的自相关矩阵，其中信道可以被认为是恒定的。当块大小必须小时，该方法实现了自相关矩阵的可靠估计，以确保在快速衰落信道的情况下保持块状平稳性假设。此外，小块大小使得可以满足由硬件和某些语音传输标准（例如CDMA2000 1X）施加的均衡器延迟约束，其中必须在信号到达时间的几个符号周期内传送解调数据。

7. 发明申请

US20060133462A1 Weighted autocorrelation method for downlink CDMA LMMSE equalizers 有权
标题翻译：下行CDMA LMMSE均衡器的加权自相关方法
公开(公告)号：US20060133462A1
公开(公告)日：2006-06-22
申请号：US11020055
申请日：2004-12-21
申请人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
发明人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04B1/71052 , H04B1/71055
摘要： Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by passing block-wise autocorrelation slides through a filter. Each autocorrelation slide is an autocorrelation matrix estimated from a short block of observed data over which the channel can be considered constant. This method achieves a reliable estimate for the autocorrelation matrix when the block size must be small to ensure that the block-wise stationarity assumption holds in cases of fast fading channels. In addition, small block sizes make it possible to satisfy the equalizer delay constraint imposed by hardware and certain voice transmission standards such as CDMA2000 1× where demodulated data must be delivered within only several symbol periods of the signal arrival time. Preliminary simulation results obtained under the 1× standard show that the proposed method outperforms the Rake receiver and the ordinary block LMMSE equalizer in the presence of filtering delay. The improvement over the ordinary block LMMSE equalizer is substantial in cases of high mobility.
摘要翻译：通过更新块自适应线性最小均方误差（LMMSE）下行链路CDMA均衡器，在更高的接收机速度下，在快衰落环境中接收下行链路CDMA信号。观察数据的自相关矩阵通过通过滤波器的块自相关滑块来更新。每个自相关幻灯片是从观测数据的短块估计的自相关矩阵，其中信道可以被认为是恒定的。当块大小必须小时，该方法实现了自相关矩阵的可靠估计，以确保在快速衰落信道的情况下保持块状平稳性假设。此外，小块大小使得可以满足由硬件和某些语音传输标准（例如CDMA2000 1x）施加的均衡器延迟约束，其中必须在信号到达时间的几个符号周期内传送解调数据。在1x标准下获得的初步仿真结果表明，所提出的方法在存在滤波延迟的情况下优于Rake接收机和普通块LMMSE均衡器。在高移动性的情况下，对普通块LMMSE均衡器的改进是显着的。

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