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104 条记录 (耗时 0.042 秒)

    Method of determining an encoding rate in a communication system
    41.
    发明授权
    Method of determining an encoding rate in a communication system 有权
    确定通信系统中编码速率的方法

    公开(公告)号：US6137845A

    公开(公告)日：2000-10-24

    申请号：US293545

    申请日：1999-04-16

    申请人： Michael Mao Wang

    发明人： Michael Mao Wang

    IPC分类号： H04J13/00 ,  H04L1/00 ,  H04L1/20 ,  H03D1/00

    CPC分类号： H04L1/0046

    摘要： A method of determining an encoding rate associated with a received data frame in a communication system includes decoding (101) the received data frame at a first and second encoding rates to determine a first and second total metric, calculating (102) a discriminant function based on the first and second total metric, comparing (103) the discriminant function to a range of predetermined values having an upper predetermined range limit and a lower predetermined range limit, and selecting (104) one of the first and second rates as a determined encoding rate based on comparing (103) depending on whether the discriminant function is above the upper predetermined range limit or below the lower predetermined range limit.

    摘要翻译： 一种在通信系统中确定与接收到的数据帧相关联的编码率的方法包括以第一和第二编码率对接收到的数据帧进行解码（101），以确定第一和第二总量度，计算（102）基于判别函数 在第一和第二总计量中，将判别函数与具有上限预定范围限制和较低预定范围限制的预定值的范围进行比较（103），并且选择（104）第一和第二速率中的一个作为确定的编码 基于判别函数是否高于上限范围限制或低于下限预定范围限制，比较（103）的速率。

    Apparatus and methods for timing recovery in a wireless transceiver
    42.
    发明授权
    Apparatus and methods for timing recovery in a wireless transceiver 有权
    无线收发器中定时恢复的装置和方法

    公开(公告)号：US08948329B2

    公开(公告)日：2015-02-03

    申请号：US11303589

    申请日：2005-12-15

    申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Fuyun Ling ,  Rajiv Vijayan

    发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Fuyun Ling ,  Rajiv Vijayan

    IPC分类号： H04L7/00 ,  H04L27/00 ,  H04L27/26

    CPC分类号： H04L27/2656 ,  H04L27/261 ,  H04L27/2675

    摘要： Apparatus and methods for use in a wireless communication system are disclosed for recovery of timing tracking in a device, such as a wireless transceiver, after decoding errors occur due to incorrect timing tracking. In particular, the disclosed methods and apparatus recover timing tracking by monitoring a decoded signal in the transceiver for decoding errors occurring during a first frame, determining whether a number of decoding errors is greater than a predetermined amount, reacquiring a first pilot channel at a start of a subsequently received second frame when the number of decoding errors is determined to be greater than the predetermined amount, and resetting timing tracking of the transceiver based on the reacquired first pilot channel.

    摘要翻译： 在无线通信系统中使用的装置和方法被公开用于在诸如无线收发器的设备中恢复定时跟踪，在由于不正确的定时跟踪而导致解码错误之后。 具体地，所公开的方法和装置通过监视收发器中的解码信号来恢复定时跟踪，以解码在第一帧期间发生的错误，确定解码错误的数量是否大于预定量，在开始时重新获取第一导频信道 当确定解码错误的数量大于预定量时，随后接收到的第二帧，并且基于重新获取的第一导频信道来重置收发信机的定时跟踪。

    Method and apparatus for efficient selection and acquisition of systems utilizing OFDM or SC-FDM
    46.
    发明授权
    Method and apparatus for efficient selection and acquisition of systems utilizing OFDM or SC-FDM 有权
    用于有效选择和采集OFDM或SC-FDM的系统的方法和装置

    公开(公告)号：US08331286B2

    公开(公告)日：2012-12-11

    申请号：US12181116

    申请日：2008-07-28

    申请人： Rotem Cooper ,  Aamod Khandekar ,  Michael Mao Wang ,  Karthik Anantharaman

    发明人： Rotem Cooper ,  Aamod Khandekar ,  Michael Mao Wang ,  Karthik Anantharaman

    IPC分类号： H04W72/02

    CPC分类号： H04L27/0012 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/0008 ,  H04L27/2613 ,  H04L27/2647

    摘要： Techniques for performing system selection and acquisition are described. In one design, a terminal may obtain at least one system record for at least one system utilizing orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDM). Each system record may include system identification information for an associated system and an index for an associated acquisition record. The terminal may also obtain at least one acquisition record for the at least one system. Each acquisition record may include at least one value for at least one configurable system parameter, e.g., FFT size, cyclic prefix length, number of guard subcarriers, etc. The terminal may perform acquisition for the at least one system in accordance with the at least one system record and the at least one acquisition record. The system and acquisition records may be stored in a Preferred Roaming List (PRL) or a Most Recently Used (MRU) list.

    摘要翻译： 描述了执行系统选择和采集的技术。 在一种设计中，终端可以为利用正交频分复用（OFDM）或单载波频分复用（SC-FDM）的至少一个系统获得至少一个系统记录。 每个系统记录可以包括关联系统的系统识别信息和关联采集记录的索引。 终端还可以获得至少一个系统的至少一个采集记录。 每个采集记录可以包括用于至少一个可配置系统参数的至少一个值，例如FFT大小，循环前缀长度，保护子载波数量等。终端可以至少根据至少一个系统执行对至少一个系统的采集 一个系统记录和至少一个采集记录。 系统和采集记录可以存储在首选漫游列表（PRL）或最近使用（MRU）列表中。

    TIMING AND FREQUENCY ACQUISITION FOR WIRELESS NETWORKS
    47.
    发明申请
    TIMING AND FREQUENCY ACQUISITION FOR WIRELESS NETWORKS 审中-公开
    无线网络的时序和频率采集

    公开(公告)号：US20120263167A1

    公开(公告)日：2012-10-18

    申请号：US13531489

    申请日：2012-06-22

    申请人： Michael Mao Wang

    发明人： Michael Mao Wang

    IPC分类号： H04W56/00 ,  H04L27/06 ,  H04J3/06

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/00

    摘要： Systems and methods are provided for processing Time Domain Multiplexing Pilot symbols by employing complex accumulators to determine peak values which indicate the start of timing and frequency information. In an embodiment, a method is provided for timing acquisition in a wireless network. The method includes acquiring samples from an Orthogonal Frequency Division Multiplexing (OFDM) data packet over a predetermined period of time, where the samples include one or more TDM pilot symbols. The samples are then processed to determine a maximum value that indicates the TDM pilot symbol has been detected.

    摘要翻译： 提供了系统和方法，用于通过采用复合累加器来确定指示定时和频率信息开始的峰值来处理时域多路复用导频符号。 在一个实施例中，提供了一种用于无线网络中的定时获取的方法。 该方法包括在预定时间段内从正交频分复用（OFDM）数据分组获取样本，其中样本包括一个或多个TDM导频符号。 然后处理样本以确定指示已经检测到TDM导频符号的最大值。

    Time tracking for a communication system
    49.
    发明授权
    Time tracking for a communication system 有权
    通讯系统的时间跟踪

    公开(公告)号：US08165167B2

    公开(公告)日：2012-04-24

    申请号：US11371536

    申请日：2006-03-08

    申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

    发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

    IPC分类号： H04J11/00 ,  H04L7/00

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

    摘要： A method for characterizing a communication channel is disclosed. A detection window is moved through a channel profile to accumulate tap energies in the channel profile within the detection window into an accumulated energy curve. A peak at a maximum in the accumulated energy curve is determined. A band relative to the accumulated energy curve is defined. A first arriving path (FAP) is determined using a trailing edge found near a second end of a zone in the accumulated energy curve. A leading edge is found near a first end of the zone of the accumulated energy curve. The last arriving path (LAP) is determined using the leading edge. The band defines a zone of the accumulated energy curve at or near the maximum that is within the band.

    摘要翻译： 公开了一种用于表征通信信道的方法。 检测窗口通过通道轮廓移动，以将检测窗口内的通道轮廓中的抽头能量累积为累积的能量曲线。 确定累积能量曲线中最大值的峰值。 定义相对于累积能量曲线的带。 使用在累积能量曲线中的区域的第二端附近发现的后沿来确定第一到达路径（FAP）。 在累积能量曲线的区域的第一端附近发现前沿。 最后到达路径（LAP）使用前沿确定。 频带定义在频带内或附近的最大值处的累积能量曲线的区域。

    WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS
    50.
    发明申请
    WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS 有权
    用于通信系统的宽带和本地网络标识传输

    公开(公告)号：US20110058469A1

    公开(公告)日：2011-03-10

    申请号：US12948759

    申请日：2010-11-18

    申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    IPC分类号： H04J11/00 ,  H04L27/28

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

    摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

    摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。