公开(公告)号：US20050054366A1

公开(公告)日：2005-03-10

申请号：US10968788

申请日：2004-10-18

申请人： Tao Chen ,  Jack Holtzman ,  Leonid Razoumov ,  Shimman Patel ,  Keith Saints ,  Edward Tiedemann

发明人： Tao Chen ,  Jack Holtzman ,  Leonid Razoumov ,  Shimman Patel ,  Keith Saints ,  Edward Tiedemann

IPC分类号： H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04L1/06 ,  H04Q7/20

CPC分类号： H04W52/362 ,  H04W52/12 ,  H04W52/40

摘要： Method and apparatus for adjusting the transmission power of base stations in simultaneous communication with a mobile station. The methods described provide for the transmission power of the base stations to be aligned. In the first exemplary embodiment, the transmitters are attached to a separate control unit through communication links. The control unit then derives the most likely command stream and send that to the base stations. In the second exemplary embodiment, the control unit periodically receives the final or average transmit level in a period and an aggregate quality measure for the feedback during a period from each of the transmitters. The control unit determines the aligned power level and transmits a message indicative of the aligned power level to the transmitters.

摘要翻译： 用于调整与移动台同时通信的基站的发射功率的方法和装置。 所描述的方法提供了要对准的基站的发射功率。 在第一示例性实施例中，发射机通过通信链路附接到单独的控制单元。 控制单元然后导出最可能的命令流并将其发送到基站。 在第二示例性实施例中，控制单元在每个发射机的周期期间周期性地接收一段时间内的最终或平均发送电平以及用于反馈的总体质量度量。 控制单元确定对准的功率电平，并将指示对准的功率电平的消息发送到发射机。

公开(公告)号：US08285318B2

公开(公告)日：2012-10-09

申请号：US10968788

申请日：2004-10-18

申请人： Tao Chen ,  Jack M. Holtzman ,  Leonid Razoumov ,  Shimman Patel ,  Keith Saints ,  Edward G. Tiedemann, Jr.

发明人： Tao Chen ,  Jack M. Holtzman ,  Leonid Razoumov ,  Shimman Patel ,  Keith Saints ,  Edward G. Tiedemann, Jr.

IPC分类号： H04B7/00

CPC分类号： H04W52/362 ,  H04W52/12 ,  H04W52/40

摘要： Method and apparatus for adjusting the transmission power of base stations in simultaneous communication with a mobile station. The methods described provide for the transmission power of the base stations to be aligned. In the first exemplary embodiment, the transmitters are attached to a separate control unit through communication links. The control unit then derives the most likely command stream and send that to the base stations. In the second exemplary embodiment, the control unit periodically receives the final or average transmit level in a period and an aggregate quality measure for the feedback during a period from each of the transmitters. The control unit determines the aligned power level and transmits a message indicative of the aligned power level to the transmitters.

摘要翻译： 用于调整与移动台同时通信的基站的发射功率的方法和装置。 所描述的方法提供了要对准的基站的发射功率。 在第一示例性实施例中，发射机通过通信链路附接到单独的控制单元。 控制单元然后导出最可能的命令流并将其发送到基站。 在第二示例性实施例中，控制单元在每个发射机的周期期间周期性地接收一段时间内的最终或平均发送电平以及用于反馈的总体质量度量。 控制单元确定对准的功率电平，并将指示对准的功率电平的消息发送到发射机。

公开(公告)号：US07688882B2

公开(公告)日：2010-03-30

申请号：US11839504

申请日：2007-08-15

申请人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

发明人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

IPC分类号： H04B1/00

CPC分类号： H04B1/7085 ,  H04B1/7117 ,  H04B7/0697

摘要： An apparatus, such as a subscriber unit or a base station within a spread spectrum communication system, provides advanced control over the time-tracking of demodulation elements when unresolvable multipath situations arise. The apparatus provides merge protection that prevents clustered demodulation elements from contracting beyond a minimum time span. In addition, the apparatus provides a master/slave feature for synchronizing the time-tracking of the demodulation elements when clustered around a multipath signal.

摘要翻译： 在扩展频谱通信系统中的诸如用户单元或基站之类的装置在不可解决的多径情况出现时提供对解调元件的时间跟踪的高级控制。 该装置提供合并保护，防止聚集的解调元件超出最小时间间隔。 此外，该设备提供主/从功能，用于在聚集在多路径信号周围时同步解调元件的时间跟踪。

公开(公告)号：US20080260005A1

公开(公告)日：2008-10-23

申请号：US11839504

申请日：2007-08-15

申请人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

发明人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

IPC分类号： H04B1/707

CPC分类号： H04B1/7085 ,  H04B1/7117 ,  H04B7/0697

摘要： An apparatus, such as a subscriber unit or a base station within a spread spectrum communication system, provides advanced control over the time-tracking of demodulation elements when unresolvable multipath situations arise. The apparatus provides merge protection that prevents clustered demodulation elements from contracting beyond a minimum time span. In addition, the apparatus provides a master/slave feature for synchronizing the time-tracking of the demodulation elements when clustered around a multipath signal.

摘要翻译： 在扩展频谱通信系统中的诸如用户单元或基站之类的装置在不可解决的多径情况出现时提供对解调元件的时间跟踪的高级控制。 该装置提供合并保护，防止聚集的解调元件超出最小时间间隔。 此外，该设备提供主/从功能，用于在聚集在多路径信号周围时同步解调元件的时间跟踪。

公开(公告)号：US07277471B2

公开(公告)日：2007-10-02

申请号：US09968399

申请日：2001-09-28

申请人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

发明人： Roland R. Rick ,  Shimman Patel ,  Keith Saints ,  Haitao Zhang

IPC分类号： H04B1/00

CPC分类号： H04B1/7085 ,  H04B1/7117 ,  H04B7/0697

摘要： An apparatus, such as a subscriber unit or a base station within a spread spectrum communication system, provides advanced control over the time-tracking of demodulation elements when unresolvable multipath situations arise. The apparatus provides merge protection that prevents clustered demodulation elements from contracting beyond a minimum time span. In addition, the apparatus provides a master/slave feature for synchronizing the time-tracking of the demodulation elements when clustered around a multipath signal.

摘要翻译： 在扩展频谱通信系统中的诸如用户单元或基站之类的装置在不可解决的多径情况出现时提供对解调元件的时间跟踪的高级控制。 该装置提供合并保护，防止聚集的解调元件超出最小时间间隔。 此外，该设备提供主/从功能，用于在聚集在多路径信号周围时同步解调元件的时间跟踪。

公开(公告)号：US06356601B1

公开(公告)日：2002-03-12

申请号：US09725351

申请日：2000-11-29

申请人： Tao Chen ,  Shimman Patel

发明人： Tao Chen ,  Shimman Patel

IPC分类号： H04L2706

CPC分类号： H04L1/208 ,  H03M13/3738 ,  H04B2201/70705 ,  H04L1/20 ,  H04W52/26

摘要： Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received frame, a quality metric is computed and compared against a threshold value. The threshold value is selected based, in part, on the quality metrics of received frames. Based on the comparison result, the received frame is indicated as being either transmitted and received in error (i.e., erased or bad) or not transmitted at all (i.e., zero rate or empty). The quality metric can relate to an energy of a received frame, a distance between a received frame and a codeword corresponding to the received frame, or other metrics. The threshold value can be selected based on the quality metrics computed for decoded frames or received frames identified as good, and can be dynamically adjusted based on current information available at the receiver. The method is advantageously used in a CDMA communications system.

摘要翻译： 在接收数据传输中检测零速率帧的技术。 根据特定解调格式接收和解调调制信号以产生解调符号。 解调的符号被分割成多个接收的帧。 对于每个接收的帧，计算质量度量并将其与阈值进行比较。 部分地基于接收帧的质量度量来选择阈值。 基于比较结果，接收到的帧被指示为发送和接收错误（即，擦除或不良）或完全没有发送（即，零率或空）。 质量度量可以涉及接收帧的能量，接收到的帧与对应于接收到的帧的码字之间的距离或其他度量。 可以基于为被识别为良好的解码帧或接收帧计算的质量度量来选择阈值，并且可以基于接收器处可用的当前信息来动态地调整阈值。 该方法有利地用于CDMA通信系统中。

公开(公告)号：US06208699B1

公开(公告)日：2001-03-27

申请号：US09388029

申请日：1999-09-01

申请人： Tao Chen ,  Shimman Patel

发明人： Tao Chen ,  Shimman Patel

IPC分类号： H04L2706

CPC分类号： H04L1/208 ,  H03M13/3738 ,  H04B2201/70705 ,  H04L1/20 ,  H04W52/26

摘要： Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received frame, a quality metric is computed and compared against a threshold value. The threshold value is selected based, in part, on the quality metrics of received frames. Based on the comparison result, the received frame is indicated as being either transmitted and received in error (i.e., erased or bad) or not transmitted at all (i.e., zero rate or empty). The quality metric can relate to an energy of a received frame, a distance between a received frame and a codeword corresponding to the received frame, or other metrics. The threshold value can be selected based on the quality metrics computed for decoded frames or received frames identified as good, and can be dynamically adjusted based on current information available at the receiver. The method is advantageously used in a CDMA communications system.

摘要翻译： 在接收数据传输中检测零速率帧的技术。 根据特定解调格式接收和解调调制信号以产生解调符号。 解调的符号被分割成多个接收的帧。 对于每个接收的帧，计算质量度量并将其与阈值进行比较。 部分地基于接收帧的质量度量来选择阈值。 基于比较结果，接收到的帧被指示为发送和接收错误（即，擦除或不良）或完全没有发送（即，零率或空）。 质量度量可以涉及接收帧的能量，接收到的帧与对应于接收到的帧的码字之间的距离或其他度量。 可以基于为被识别为良好的解码帧或接收帧计算的质量度量来选择阈值，并且可以基于接收器处可用的当前信息来动态地调整阈值。 该方法有利地用于CDMA通信系统中。

公开(公告)号：US06771692B2

公开(公告)日：2004-08-03

申请号：US09964589

申请日：2001-09-25

申请人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

发明人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

IPC分类号： H04B1707

CPC分类号： H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

摘要： In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

公开(公告)号：US06480528B1

公开(公告)日：2002-11-12

申请号：US09330440

申请日：1999-06-11

申请人： Shimman Patel ,  Thomas Wilborn

发明人： Shimman Patel ,  Thomas Wilborn

IPC分类号： H04B1707

CPC分类号： H04J1/05 ,  H03G3/3052 ,  H04L5/06

摘要： A method and a receiver for processing a desired signal for decoding (i.e., by a decoder). In accordance with the method, an input signal that includes the desired signal and additional signals is received and filtered with a first filter having a bandwidth greater than a bandwidth of the desired signal. The filtered signal is then sampled to generate discrete time samples, which is then filtered with a discrete time matched filter. The filtered samples are then scaled with a scaling factor and quantized. A quantity related to an amplitude of the quantized samples (i.e., power) is measured, and the scaling factor is adjusted in accordance with the measured quantity. The quantized samples can be further processed (i.e., demodulated) and provided to a decoder. The desired signal can be a quadrature modulated signal, in which case matched filtering, scaling, and quantization are performed on the in-phase and quadrature components of the desired signal. The adjustment of the scaling factor can be performed by an automatic gain control (AGC) loop that compares the measured quantity (e.g., signal power of the quantized samples) against a predetermined value to generate error values. The AGC loop then filters the error values to generate the scaling factor. In an embodiment, the loop filtering can be performed with an integrator.

摘要翻译： 一种用于处理用于解码的期望信号（即，由解码器）的方法和接收器。 根据该方法，包含期望信号和附加信号的输入信号被接收并用具有大于期望信号带宽的带宽的第一滤波器进行滤波。 然后对经滤波的信号进行采样以产生离散时间样本，然后用离散时间匹配滤波器过滤。 然后将经过滤的样品用比例因子缩放并量化。 测量与量化样品的振幅相关的量（即功率），并且根据测量的量调节比例因子。 量化样本可以进一步处理（即解调）并提供给解码器。 期望的信号可以是正交调制信号，在这种情况下，对期望信号的同相和正交分量执行匹配滤波，缩放和量化。 缩放因子的调整可以通过将测量量（例如，量化样本的信号功率）与预定值进行比较以产生误差值的自动增益控制（AGC）循环来执行。 然后，AGC环路对误差值进行滤波以生成比例因子。 在一个实施例中，环路滤波可以用积分器来执行。

公开(公告)号：US07437172B2

公开(公告)日：2008-10-14

申请号：US10316760

申请日：2002-12-10

申请人： Qingxin Chen ,  Shimman Patel

发明人： Qingxin Chen ,  Shimman Patel

IPC分类号： H04B7/00

CPC分类号： H04L1/0061 ,  H04L1/0072 ,  H04L1/20 ,  H04L1/201

摘要： Techniques to detect for DTX frames in a “primary” transmission that may be sent in a non-continuous manner using a “secondary” transmission that is sent during periods of no transmission for the primary transmission. The primary and secondary transmissions may be the ones sent on the F-DCCH and Forward Power Control Subchannel, respectively, in an IS-2000 system. In one method, a determination is first made whether or not a frame received for the primary transmission in a particular frame interval is a good frame (e.g., based on CRC). If the received frame is not a good frame, then a determination is next made whether the received frame is a DTX frame or an erased frame based on a number of metrics determined for the primary and secondary transmissions. The metrics may include symbol error rate of the received frame, secondary transmission (e.g., PC bit) energy, and received frame energy.

摘要翻译： 在“主”传输中检测可以以非连续方式发送的DTX帧的技术，使用在主传输的无传输期间发送的“次”传输。 主要和次要传输可以分别是在IS-2000系统中在F-DCCH和前向功率控制子信道上发送的。 在一种方法中，首先确定在特定帧间隔中为主传输接收的帧是否是良好帧（例如，基于CRC）。 如果接收到的帧不是良好的帧，则接着确定接收到的帧是否是基于针对主传输和次传输确定的度量的数目的DTX帧或已擦除的帧。 度量可以包括接收到的帧的符号错误率，二次传输（例如，PC位）能量和接收到的帧能量。