利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

246 条记录 (耗时 0.049 秒)

    Evaluation of transmitter performance
    31.
    发明申请
    Evaluation of transmitter performance 失效
    发射机性能评估

    公开(公告)号：US20070071122A1

    公开(公告)日：2007-03-29

    申请号：US11361085

    申请日：2006-02-22

    申请人： Fuyun Ling ,  Durk Van Veen ,  Murali Chari ,  Thomas Sun

    发明人： Fuyun Ling ,  Durk Van Veen ,  Murali Chari ,  Thomas Sun

    IPC分类号： H04K1/10

    CPC分类号： H04L5/023 ,  H04B17/13 ,  H04B17/391 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/0232 ,  H04L27/0012

    摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. A signal analyzer can be used to sample the output of a transmitter and the sampled signal can be propagated to a processor. The processor can generate frequency domain channel estimates for the subcarriers. If the transmitted modulation symbols are unknown, the processor can determine the modulation symbols and use the determined modulation symbols to calculate the channel estimates. The channel estimates can be averaged and used to generate various metrics to evaluate the transmitter performance.

    摘要翻译： 描述了便于在无线通信环境中监视发射机性能的系统和方法。 信号分析仪可用于对发射机的输出采样，采样信号可以传播到处理器。 处理器可以产生子载波的频域信道估计。 如果发送的调制符号是未知的，则处理器可以确定调制符号并使用确定的调制符号来计算信道估计。 信道估计可以被平均化并用于生成各种度量以评估发射机的性能。

    Modulation type determination for evaluation of transmitter performance
    33.
    发明申请
    Modulation type determination for evaluation of transmitter performance 审中-公开
    用于评估发射机性能的调制类型确定

    公开(公告)号：US20070070877A1

    公开(公告)日：2007-03-29

    申请号：US11361088

    申请日：2006-02-22

    申请人： Thomas Sun ,  Durk Van Veen ,  Fuyun Ling ,  Murali Ramaswamy Chari

    发明人： Thomas Sun ,  Durk Van Veen ,  Fuyun Ling ,  Murali Ramaswamy Chari

    IPC分类号： H04J11/00

    CPC分类号： H04L27/0012 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2601 ,  H04L27/2647

    摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. If the received modulation symbols are unknown during transmitter monitoring, it may be necessary to determine the modulation symbols for each subcarrier. The modulation types can be evaluated over a subset of subcarriers having a consistent modulation type, to reduce the possibility of an erroneous modulation type determination to an extremely low level. A metric can be generated for each modulation type that indicates the likelihood of a particular modulation type for the subset of subcarriers. The modulation type can be selected based upon the metric and modulation symbols consistent with the modulation type can be used for the subset of subcarriers.

    摘要翻译： 描述了便于在无线通信环境中监视发射机性能的系统和方法。 如果在发射机监控期间接收到的调制符号是未知的，则可能需要确定每个子载波的调制符号。 调制类型可以在具有一致调制类型的子载波的子集上进行评估，以将错误调制类型确定的可能性降低到非常低的水平。 可以为指示子载波子集的特定调制类型的可能性的每种调制类型生成度量。 可以基于度量来选择调制类型，并且可以将与调制类型一致的调制符号用于子载波的子集。

    Bit log likelihood ratio evaluation
    34.
    发明申请
    Bit log likelihood ratio evaluation 失效
    位对数似然比评估

    公开(公告)号：US20060178755A1

    公开(公告)日：2006-08-10

    申请号：US11330652

    申请日：2006-01-11

    申请人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

    发明人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

    IPC分类号： G05B15/00

    CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

    摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

    摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常被定义为k1≤2或k2≥2。 该方法选择k1 <2> 2和k2 <2>之间的不匹配能量比（k <2> 2），并为双层QPSK涡轮增益产生位LLR值 使用不匹配的k <2>能量比进行解码。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k <2>为约5.0625。 或者说，通过确定k1 <2> 2和k2 <2>之间的近似中点，所选择的不匹配的k 2 2能量比。

    Method and apparatus for monitoring transmission quality
    36.
    发明授权
    Method and apparatus for monitoring transmission quality 失效
    监测传输质量的方法和装置

    公开(公告)号：US06967998B1

    公开(公告)日：2005-11-22

    申请号：US09438988

    申请日：1999-11-12

    申请人： Tao Chen ,  Fuyun Ling ,  Edward G. Tiedemann, Jr.

    发明人： Tao Chen ,  Fuyun Ling ,  Edward G. Tiedemann, Jr.

    IPC分类号： H04B7/26 ,  H04B17/00 ,  H04W28/04 ,  H04L1/20

    CPC分类号： H04B17/327 ,  H04B17/309

    摘要： In wireless communications, it is necessary to monitor the transmission quality of communications channels to maintain system performance and operation. The invention provides a way of measuring bit error rates in channels at the receiver, without diminishing channel throughput by inserting quality monitoring data into the signal at the transmitter.

    摘要翻译： 在无线通信中，需要监控通信信道的传输质量，保持系统的性能和运行。 本发明提供了一种在接收机中测量信道中的比特错误率的方法，而不会通过将质量监视数据插入到发射机的信号中来减少信道吞吐量。

    Systems and methods for frequency acquisition in a wireless communication network
    38.
    发明申请
    Systems and methods for frequency acquisition in a wireless communication network 审中-公开
    无线通信网络中频率采集的系统和方法

    公开(公告)号：US20050163263A1

    公开(公告)日：2005-07-28

    申请号：US11021028

    申请日：2004-12-22

    申请人： Alok Gupta ,  Fuyun Ling

    发明人： Alok Gupta ,  Fuyun Ling

    IPC分类号： H04L27/06

    CPC分类号： H04L27/2665 ,  H04L7/007 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2675 ,  H04L27/2695

    摘要： The disclosed embodiments provide for methods and systems for initial frequency acquisition in a wireless communication network. In one aspect, a method for initial frequency acquisition includes the acts of receiving a stream of input samples from a transmitter, determining an estimate for a frequency offset associated with the transmitter and the receiver based on the received input samples, and compensating for the frequency offset to achieve an initial frequency acquisition.

    摘要翻译： 所公开的实施例提供了用于无线通信网络中的初始频率采集的方法和系统。 一方面，一种用于初始频率获取的方法包括从发射机接收输入样本流的动作，基于接收到的输入样本确定与发射机和接收机相关联的频率偏移的估计，并补偿频率 偏移以实现初始频率采集。

    Method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system
    39.
    发明授权
    Method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system 有权
    用于在码分多址通信系统中发起切换的有效候选频率​​搜索的方法和装置

    公开(公告)号：US06597922B1

    公开(公告)日：2003-07-22

    申请号：US09312262

    申请日：1999-05-14

    申请人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

    发明人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

    IPC分类号： H04B700

    CPC分类号： H04W52/225 ,  H04W36/0094 ,  H04W52/40 ,  H04W52/42

    摘要： A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.

    摘要翻译： 一种用于在码分多址通信系统中发起切换的有效候选频率​​搜索的方法和装置。 该方法包括当导频信号由被功率控制到目标接收电平的移动台发送时，业务信道功率电平相对于导频信道增加，以提高接收机性能。 改进的特征是在基站处接收到的接收到的导频保持相同，而接收机在接收到的冗余业务符号中接收到额外的能量以增强正确解码接收帧的概率。 基站从感兴趣的频率检测到不存在移动台发送的信号。 如果基站知道不存在的起始时间和持续时间，则可以在该预定时间段内集中其检测。 如果没有信号在帧边界的两个帧上扩展，则可以提高性能。

    Method and apparatus for adaptive linear equalization for walsh covered modulation
    40.
    发明授权
    Method and apparatus for adaptive linear equalization for walsh covered modulation 有权

    公开(公告)号：US06522683B1

    公开(公告)日：2003-02-18

    申请号：US09636008

    申请日：2000-08-10

    申请人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

    发明人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

    IPC分类号： H04B169

    CPC分类号： H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

    摘要： A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.