公开(公告)号：US20070111664A1

公开(公告)日：2007-05-17

申请号：US11621307

申请日：2007-01-09

申请人： Jeffrey Levin ,  Thomas Wilborn ,  Brian Butler ,  Paul Bender

发明人： Jeffrey Levin ,  Thomas Wilborn ,  Brian Butler ,  Paul Bender

IPC分类号： H04B1/00 ,  H04B17/00

CPC分类号： H04B1/7107 ,  H04B2201/70701

摘要： Techniques for canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence to provide the estimated pilot interference. The pilot interference estimates due to all interfering multipaths are combined to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

摘要翻译： 用于在无线（例如CDMA）通信系统中消除导频干扰的技术。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列提供估计的导频干扰。 由于所有干扰多径导致的导频干扰估计被组合以导出总导频干扰，其从数据样本中减去以提供导频取消的数据样本。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。

公开(公告)号：US20060007895A1

公开(公告)日：2006-01-12

申请号：US11173504

申请日：2005-06-30

申请人： Alessandro Coralli ,  Henry Pfister ,  Jilei Hou ,  John Smee ,  Roberto Padovani ,  Brian Butler ,  Jeffrey Levin ,  Thomas Wilborn ,  Paul Bender

发明人： Alessandro Coralli ,  Henry Pfister ,  Jilei Hou ,  John Smee ,  Roberto Padovani ,  Brian Butler ,  Jeffrey Levin ,  Thomas Wilborn ,  Paul Bender

IPC分类号： H04B7/216

CPC分类号： H04B1/7107 ,  H04B2201/70701

摘要： Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

公开(公告)号：US20050013350A1

公开(公告)日：2005-01-20

申请号：US10921428

申请日：2004-08-17

申请人： Alessandro Coralli ,  Henry Pfister ,  Jilei Hou ,  John Smee ,  Roberto Padovani ,  Brian Butler ,  Jeffrey Levin ,  Thomas Wilborn ,  Paul Bender

发明人： Alessandro Coralli ,  Henry Pfister ,  Jilei Hou ,  John Smee ,  Roberto Padovani ,  Brian Butler ,  Jeffrey Levin ,  Thomas Wilborn ,  Paul Bender

IPC分类号： H04B1/707

CPC分类号： H04B1/7107 ,  H04B2201/70701

摘要： Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

摘要翻译： 用于估计和消除无线（例如，CDMA）通信系统中的导频干扰的方法和系统。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列。 由多个干扰多径导致的导频干扰估计被累加以导出总导频干扰，其从数据样本中减去以提供导频取消的数据采样。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。

公开(公告)号：US20080089310A1

公开(公告)日：2008-04-17

申请号：US11948819

申请日：2007-11-30

申请人： Roland Rick ,  Thomas Wilborn

发明人： Roland Rick ,  Thomas Wilborn

IPC分类号： H04B7/208

CPC分类号： H04W48/20 ,  H04B17/318

摘要： This disclosure is directed to power estimation techniques for use by a subscriber unit of a frequency division multiple access (FDMA) system during the cell selection process. The power estimation techniques recognize that adjacent cells, i.e., adjacent in terms of frequency, often have slight overlap. Thus, the power from a signal associated with one cell can cause power to be detected in an adjacent cell, even if no signal is actually present in the adjacent cell. In accordance with this disclosure, techniques are described for identifying, reducing or eliminating the detection of false positives in such adjacent cells. By identifying, reducing or eliminating the detection of false positives, the cell selection process can be accelerated and additional processing of false positive signals in such adjacent cells can be avoided.

摘要翻译： 本公开涉及在小区选择过程期间由频分多址（FDMA）系统的用户单元使用的功率估计技术。 功率估计技术认识到相邻小区，即频率相邻，通常具有轻微的重叠。 因此，即使在相邻小区中实际上没有信号，来自与一个小区相关联的信号的功率也可以在相邻小区中检测到功率。 根据本公开，描述了用于识别，减少或消除在这些相邻小区中的假阳性检测的技术。 通过识别，减少或消除假阳性的检测，可以加速细胞选择过程，并且可以避免在这些相邻细胞中的假阳性信号的附加处理。

公开(公告)号：US20080002604A1

公开(公告)日：2008-01-03

申请号：US11852924

申请日：2007-09-10

申请人： Thomas Wilborn ,  Arunava Chaudhuri ,  David Pandian ,  Thomas Bailey

发明人： Thomas Wilborn ,  Arunava Chaudhuri ,  David Pandian ,  Thomas Bailey

IPC分类号： H04B7/216

CPC分类号： H04W36/0088 ,  H04W36/14 ,  H04W36/30

摘要： Techniques for scheduling measurements for cells in multiple (e.g., GSM and W-CDMA) wireless communication systems are described. GSM neighbor cells are categorized based on a number of states. The states are prioritized in a manner to achieve good performance. The GSM neighbor cells are thus assigned different priorities depending on their states. W-CDMA neighbor cells are prioritized relative to the states for GSM cells. All W-CDMA neighbor cells can be assigned the same state, given the same priority, and considered as “one” W-CDMA cell in the scheduling. A cell in the GSM or W-CDMA system is selected based on the priorities of the neighbor cells, and the selected cell is scheduled for measurement in the next available frame. The highest-ranking GSM or W-CDMA cell for each idle frame is thus granted use of that idle frame for measurement.

摘要翻译： 描述了用于调度多个（例如GSM和W-CDMA）无线通信系统中的小区的测量的技术。 基于多个状态对GSM相邻小区进行分类。 各州的优先顺序是达到良好的表现。 因此，GSM相邻小区根据其状态分配不同的优先级。 W-CDMA相邻小区相对于GSM小区的状态是优先的。 给定相同的优先级，所有W-CDMA相邻小区可以分配相同的状态，并且在调度中被认为是“一个”W-CDMA小区。 基于相邻小区的优先级来选择GSM或W-CDMA系统中的小区，并且所选择的小区被调度用于下一个可用帧中的测量。 因此，每个空闲帧的最高级别的GSM或W-CDMA小区被授权使用该空闲帧进行测量。

公开(公告)号：US20050047492A1

公开(公告)日：2005-03-03

申请号：US10650547

申请日：2003-08-27

申请人： Messay Amerga ,  Thomas Wilborn ,  Gurdeep Singh

发明人： Messay Amerga ,  Thomas Wilborn ,  Gurdeep Singh

IPC分类号： H04B1/707

CPC分类号： H04B1/70735 ,  H04B1/7083 ,  H04B2201/70702

摘要： Techniques for reducing search time using known scrambling code offsets are disclosed. In one embodiment, a plurality of search results is generated by correlating a received signal with a synchronization sequence. The plurality of search results is reduced by removing any results whose offset is within a threshold of a stored offset. In another embodiment, stored offsets correspond to previously identified cells. In yet another embodiment, a searcher further correlates the received signal with a scrambling code over a search window to produce a list search result. The scrambling code may be associated with one of the cells in a neighbor list. Various other embodiments are also presented. Benefits include efficient searching which allows for improved base station selection and therefore improved performance and system capacity.

摘要翻译： 公开了使用已知的扰码偏移减少搜索时间的技术。 在一个实施例中，通过将接收的信号与同步序列相关联来产生多个搜索结果。 通过去除其偏移在所存储的偏移的阈值内的任何结果来减少多个搜索结果。 在另一个实施例中，存储的偏移对应于先前识别的小区。 在另一个实施例中，搜索者进一步将接收到的信号与搜索窗口上的扰码相关联，以产生列表搜索结果。 扰码可以与邻居列表中的一个小区相关联。 还提出了各种其它实施例。 优点包括有效的搜索，可以改善基站选择，从而提高性能和系统容量。

公开(公告)号：US06721368B1

公开(公告)日：2004-04-13

申请号：US09519734

申请日：2000-03-04

申请人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

发明人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

IPC分类号： H04L2704

CPC分类号： H03G3/3042 ,  H03F2203/7239 ,  H03G1/0088

摘要： Transmitter architectures for a communications system having improved performance over conventional transmitter architectures. The improvements include a combination of the following: faster response time for the control signals, improved linearity, reduced interference, reduced power consumption, lower circuit complexity, and lower costs. For a cellular application, these improvements can lead to increased system capacity, smaller telephone size, increased talk and standby times, and greater acceptance of the product. Circuitry is provided to speed up the response time of a control signal. The control loop for various elements in the transmit signal path are integrated. A gain control mechanism allows for accurate adjustment of the output transmit power level. Control mechanisms are provided to power down the power amplifier, or the entire transmit signal path, when not needed. The gains of the various elements in the transmit signal path are controlled to reduce transients in the output transmit power, and to also ensure that transients are downward.

摘要翻译： 具有比传统发射机架构具有改进性能的通信系统的发射机架构。 这些改进包括以下组合：控制信号的响应时间更快，线性度更好，干扰减少，功耗降低，电路复杂度降低，成本降低。 对于蜂窝应用，这些改进可以导致系统容量增加，电话尺寸更小，通话和待机时间增加，以及对产品的更多接受。 提供电路以加快控制信号的响应时间。 发送信号路径中的各种元件的控制回路被集成。 增益控制机制允许精确调整输出发射功率电平。 提供控制机制以在不需要时将功率放大器或整个发射信号路径断电。 控制发射信号路径中的各种元件的增益以减少输出发射功率的瞬变，并且还确保瞬变是向下的。

公开(公告)号：US06292122B1

公开(公告)日：2001-09-18

申请号：US09517766

申请日：2000-03-04

申请人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn

发明人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn

IPC分类号： H03M300

CPC分类号： H03F3/24 ,  H03F2200/331 ,  H03G3/3036 ,  H03M3/374 ,  H03M3/50 ,  H03M7/3031

摘要： An interface circuit for converting a digital signal to an analog signal. The interface circuit includes a time response adjustment circuit, a modulator, and a filter. The time response adjustment circuit receives the digital signal and generates an adjusted signal. The modulator couples to the time response adjustment circuit, receives the adjusted signal, and generates a modulator signal. The filter couples to the modulator, receives the modulator signal, and generates the analog signal. The analog signal has a time response that is modified by the time response adjustment circuit. In an embodiment, the time response adjustment circuit includes a gain element, a delay element, and a summer. The gain element receives and scales the digital signal by a scaling factor. The delay element receives and delays the digital signal by a time delay. The summer couples to the gain element and the delay element, sums the scaled signal from the gain element and the delayed signal from the delay element to generate the adjusted signal.

摘要翻译： 一种用于将数字信号转换为模拟信号的接口电路。 接口电路包括时间响应调整电路，调制器和滤波器。 时间响应调整电路接收数字信号并产生调整信号。 调制器耦合到时间响应调整电路，接收经调整的信号，并产生调制器信号。 滤波器耦合到调制器，接收调制器信号，并产生模拟信号。 模拟信号具有由时间响应调整电路修改的时间响应。 在一个实施例中，时间响应调整电路包括增益元件，延迟元件和加法器。 增益元件以缩放因子接收和缩放数字信号。 延迟元件接收并延迟数字信号延时。 加法器与增益元件和延迟元件耦合，将来自增益元件的定标信号和来自延迟元件的延迟信号相加，以产生调整后的信号。

公开(公告)号：US20050079824A1

公开(公告)日：2005-04-14

申请号：US10683639

申请日：2003-10-09

申请人： Roland Rick ,  Thomas Wilborn

发明人： Roland Rick ,  Thomas Wilborn

IPC分类号： H04W24/02 ,  H04B1/10 ,  H04B17/00 ,  H04W48/20 ,  H04Q7/20

CPC分类号： H04W48/20 ,  H04B17/318

摘要： This disclosure is directed to power estimation techniques for use by a subscriber unit of a frequency division multiple access (FDMA) system during the cell selection process. The power estimation techniques recognize that adjacent cells, i.e., adjacent in terms of frequency, often have slight overlap. Thus, the power from a signal associated with one cell can cause power to be detected in an adjacent cell, even if no signal is actually present in the adjacent cell. In accordance with this disclosure, techniques are described for identifying, reducing or eliminating the detection of false positives in such adjacent cells. By identifying, reducing or eliminating the detection of false positives, the cell selection process can be accelerated and additional processing of false positive signals in such adjacent cells can be avoided.

摘要翻译： 本公开涉及在小区选择过程期间由频分多址（FDMA）系统的用户单元使用的功率估计技术。 功率估计技术认识到相邻小区，即频率相邻，通常具有轻微的重叠。 因此，即使在相邻小区中实际上没有信号，来自与一个小区相关联的信号的功率也可以在相邻小区中检测到功率。 根据本公开，描述了用于识别，减少或消除在这些相邻小区中的假阳性检测的技术。 通过识别，减少或消除假阳性的检测，可以加速细胞选择过程，并且可以避免在这些相邻细胞中的假阳性信号的附加处理。

公开(公告)号：US20050032542A1

公开(公告)日：2005-02-10

申请号：US10730702

申请日：2003-12-04

申请人： Thomas Wilborn ,  Arunava Chaudhuri ,  David Pandian ,  Thomas Bailey

发明人： Thomas Wilborn ,  Arunava Chaudhuri ,  David Pandian ,  Thomas Bailey

IPC分类号： H04W36/14 ,  H04W36/30 ,  H04Q7/20

CPC分类号： H04W36/0088 ,  H04W36/14 ,  H04W36/30

摘要： Techniques for scheduling measurements for cells in multiple (e.g., GSM and W-CDMA) wireless communication systems are described. GSM neighbor cells are categorized based on a number of states. The states are prioritized in a manner to achieve good performance. The GSM neighbor cells are thus assigned different priorities depending on their states. W-CDMA neighbor cells are prioritized relative to the states for GSM cells. All W-CDMA neighbor cells can be assigned the same state, given the same priority, and considered as “one” W-CDMA cell in the scheduling. A cell in the GSM or W-CDMA system is selected based on the priorities of the neighbor cells, and the selected cell is scheduled for measurement in the next available frame. The highest-ranking GSM or W-CDMA cell for each idle frame is thus granted use of that idle frame for measurement.

摘要翻译： 描述了用于调度多个（例如GSM和W-CDMA）无线通信系统中的小区的测量的技术。 基于多个状态对GSM相邻小区进行分类。 各州的优先顺序是达到良好的表现。 因此，GSM相邻小区根据其状态分配不同的优先级。 W-CDMA相邻小区相对于GSM小区的状态是优先的。 给定相同的优先级，所有W-CDMA相邻小区可以分配相同的状态，并且在调度中被认为是“一个”W-CDMA小区。 基于相邻小区的优先级来选择GSM或W-CDMA系统中的小区，并且所选择的小区被调度用于下一个可用帧中的测量。 因此，每个空闲帧的最高级别的GSM或W-CDMA小区被授权使用该空闲帧进行测量。