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    PHY layer PPDU construction for body area network (BAN) devices
    71.
    发明授权
    PHY layer PPDU construction for body area network (BAN) devices 有权
    物理层PPDU构建体区域网（BAN）设备

    公开(公告)号：US08391228B2

    公开(公告)日：2013-03-05

    申请号：US12760513

    申请日：2010-04-14

    申请人： Anuj Batra ,  Timothy M. Schmidl ,  Srinath Hosur ,  June Chul Roh

    发明人： Anuj Batra ,  Timothy M. Schmidl ,  Srinath Hosur ,  June Chul Roh

    IPC分类号： H04W4/00 ,  H04W72/04

    CPC分类号： H04W4/80 ,  H04L27/18 ,  H04L27/20 ,  H04L27/2675 ,  H04L69/22 ,  H04W52/36 ,  H04W52/367 ,  H04W72/0453 ,  H04W74/0816

    摘要： In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper.

    摘要翻译： 在至少一些实施例中，通信设备包括具有物理（PHY）层的收发器。 基于用于BAN分组传输的恒定符号速率并且基于M-ary PSK，差分M-ary PSK或旋转差分M-ary PSK调制，PHY层被配置用于在有限多径环境中的体区域网络（BAN）操作。 PHY层被配置为基于级联块，插入缩短的比特块，Bose，Ray-Chaudhuri，Hocquenghem（BCH）编码器，移除缩短的比特块，加法来构造物理层服务数据单元（PSDU） 填充比特块，扩展器，比特交织器，加扰器和符号映射器。

    Receiving a Pilot Design and Channel Estimation
    72.
    发明申请
    Receiving a Pilot Design and Channel Estimation 有权
    接收导频设计和信道估计

    公开(公告)号：US20100124297A1

    公开(公告)日：2010-05-20

    申请号：US12639422

    申请日：2009-12-16

    申请人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    发明人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    IPC分类号： H04L27/28 ,  H04L27/00

    CPC分类号： H04L1/06 ,  H04B7/0452 ,  H04B7/12 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226

    摘要： Embodiments of the invention provide a receiver in an OFDM based communication system adapted to perform channel estimation using a received reference signal transmitted from at least one antenna, said reference signal being substantially located into two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A method of generating pilot structure, the pilot structure provides information to an apparatus for channel estimation in the OFDM system with a transmission time interval of seven OFDM symbols. The pilot structure comprising pilot signals from at least one transmitting antenna located in various OFDM symbols of the transmission time interval.

    摘要翻译： 本发明的实施例提供了一种基于OFDM的通信系统中的接收机，其适于使用从至少一个天线发送的接收到的参考信号来执行信道估计，所述参考信号基本上位于包含两个以上的传输时间间隔的两个OFDM符号中 OFDM符号。 一种生成导频结构的方法，导频结构向具有7个OFDM符号的传输时间间隔的OFDM系统中的信道估计装置提供信息。 所述导频结构包括来自位于所述传输时间间隔的各种OFDM符号中的至少一个发射天线的导频信号。

    Interleaved coder and method
    73.
    发明授权
    Interleaved coder and method 有权
    交错编码器和方法

    公开(公告)号：US06603412B2

    公开(公告)日：2003-08-05

    申请号：US10033135

    申请日：2001-12-28

    申请人： Alan Gatherer ,  Anand Dabak ,  Timothy M. Schmidl ,  John Linn

    发明人： Alan Gatherer ,  Anand Dabak ,  Timothy M. Schmidl ,  John Linn

    IPC分类号： H03M700

    CPC分类号： H03M13/6566 ,  H03M13/271 ,  H03M13/2771

    摘要： Quasi-parallel read/write interleaver architecture for data blocks by sequential spreading of variable size data subblocks into memory banks with bank address contention initiating the next data subblock. Iterative Turbo decoders with MAP decoders use such quasi-parallel interleavers and deinterleavers.

    摘要翻译： 用于数据块的准并行读/写交织器架构通过将可变大小的数据子块顺序扩展到具有启动下一数据子块的存储体地址争用的存储体。 具有MAP解码器的迭代Turbo解码器使用这种准并行交织器和解交织器。

    Joint position and carrier frequency estimation method of initial frequency acquisition for a WCDMA mobile terminal
    74.
    发明授权
    Joint position and carrier frequency estimation method of initial frequency acquisition for a WCDMA mobile terminal 有权
    WCDMA移动终端初始频率采集的联合位置和载波频率估计方法

    公开(公告)号：US06597729B1

    公开(公告)日：2003-07-22

    申请号：US09537137

    申请日：2000-03-29

    申请人： Timothy M. Schmidl ,  Sundararajan Sriram

    发明人： Timothy M. Schmidl ,  Sundararajan Sriram

    IPC分类号： H04L1707

    CPC分类号： H04B1/7077 ,  H04B1/70735

    摘要： A WCDMA system and method of data communication allows a receiver to reliably achieve carrier frequency acquisition following turn-on without use of temperature compensation. Initial frequency acquisition is achieved by estimating the signal path position having the largest magnitude and then by estimating the phase difference associated with primary synchronization channels at a predetermined position within a single frame. The estimated phase difference is used to estimate a carrier frequency offset that can be used to adjust the local voltage controlled oscillator frequency, thereby acquiring the WCDMA communication signal carrier frequency.

    摘要翻译： WCDMA系统和数据通信方法允许接收机在不使用温度补偿的情况下可靠地实现导通后的载波频率采集。 通过估计具有最大幅度的信号路径位置，然后通过估计与单个帧内的预定位置处的主同步信道相关联的相位差来实现初始频率获取。 估计的相位差用于估计可用于调整本地压控振荡器频率的载波频率偏移，从而获取WCDMA通信信号载波频率。

    Timing and frequency synchronization of OFDM signals
    75.
    发明授权
    Timing and frequency synchronization of OFDM signals 失效
    OFDM信号的定时和频率同步

    公开(公告)号：US5732113A

    公开(公告)日：1998-03-24

    申请号：US666237

    申请日：1996-06-20

    申请人： Timothy M. Schmidl ,  Donald C. Cox

    发明人： Timothy M. Schmidl ,  Donald C. Cox

    IPC分类号： H04L27/26 ,  H04L7/00

    CPC分类号： H04L5/0048 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675

    摘要： A method and apparatus achieves rapid timing synchronization, carrier frequency synchronization, and sampling rate synchronization of a receiver to an orthogonal frequency division multiplexed (OFDM) signal. The method uses two OFDM training symbols to obtain full synchronization in less than two data frames. A first OFDM training symbol has only even-numbered sub-carriers, and substantially no odd-numbered sub-carriers, an arrangement that results in half-symbol symmetry. A second OFDM training symbol has even-numbered sub-carriers differentially modulated relative to those of the first OFDM training symbol by a predetermined sequence. Synchronization is achieved by computing metrics which utilize the unique properties of these two OFDM training symbols. Timing synchronization is determined by computing a timing metric which recognizes the half-symbol symmetry of the first OPDM training symbol. Carrier frequency offset estimation is performed in using the timing metric as well as a carrier frequency offset metric which peaks at the correct value of carrier frequency offset. Sampling rate offset estimation is performed by evaluating the slope of the locus of points of phase rotation due to sampling rate offset as a function of sub-carrier frequency number.

    摘要翻译： 一种方法和装置实现了接收机到正交频分复用（OFDM）信号的快速定时同步，载波频率同步和采样率同步。 该方法使用两个OFDM训练符号在少于两个数据帧中获得完全同步。 第一OFDM训练符号仅具有偶数子载波，并且基本上没有奇数子载波，导致半符号对称的布置。 第二OFDM训练符号具有相对于第一OFDM训练符号的预定序列差分调制的偶数子载波。 通过计算利用这两个OFDM训练符号的独特属性的度量来实现同步。 通过计算识别第一OPDM训练符号的半符号对称性的定时度量来确定定时同步。 使用定时度量以及在载波频率偏移的正确值处达到峰值的载波频率偏移度量来执行载波频率偏移估计。 通过对作为副载波频数的函数的采样率偏移量的相位旋转点的轨迹的斜率进行评估来进行采样率偏移估计。

    Producing STTD diversity signal from rake combined level 3 message
    78.
    发明授权
    Producing STTD diversity signal from rake combined level 3 message 有权
    从耙组合3级消息生成STTD分集信号

    公开(公告)号：US08059746B2

    公开(公告)日：2011-11-15

    申请号：US12470241

    申请日：2009-05-21

    申请人： Anand Ganesh Dabak ,  Timothy M. Schmidl ,  Srinath Hosur

    发明人： Anand Ganesh Dabak ,  Timothy M. Schmidl ,  Srinath Hosur

    IPC分类号： H04B7/02 ,  H04L1/02

    CPC分类号： H04L1/06

    摘要： A circuit is designed with a measurement circuit (746) coupled to receive an input signal from at least one of a first antenna and a second antenna of a transmitter. The measurement circuit produces an output signal corresponding to a magnitude of the input signal. A control circuit (726) is coupled to receive the output signal, a first reference signal (.eta..sub.1) and a second reference signal (.eta..sub.2). The control circuit is arranged to produce a control signal in response to a comparison of the output signal, the first reference signal and the second reference signal.

    摘要翻译： 电路设计有测量电路（746），耦合到接收来自发射机的第一天线和第二天线中的至少一个的输入信号。 测量电路产生对应于输入信号幅度的输出信号。 控制电路（726）被耦合以接收输出信号，第一参考信号（...）和第二参考信号（...）。 控制电路被布置成响应于输出信号，第一参考信号和第二参考信号的比较而产生控制信号。

    Receiving a pilot design and channel estimation
    79.
    发明授权
    Receiving a pilot design and channel estimation 有权
    接收试点设计和信道估计

    公开(公告)号：US07929416B2

    公开(公告)日：2011-04-19

    申请号：US12639422

    申请日：2009-12-16

    申请人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    发明人： Aris Papasakellariou ,  Timothy M. Schmidl ,  Eko N. Onggosanusi ,  Anand Dabak

    IPC分类号： H04J11/00

    CPC分类号： H04L1/06 ,  H04B7/0452 ,  H04B7/12 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226

    摘要： A receiver in an OFDM based communication system is adapted to perform channel estimation using a received reference signal transmitted from at least one antenna The reference signal is substantially located into at least two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A power level of said reference signal is divided into said non-consecutive OFDM symbols in said transmission time interval and adapted to use the reference signal located in a first OFDM symbol in succeeding transmission time intervals in addition to the reference symbols in a current transmission time interval and a preceding transmission time interval.

    摘要翻译： 基于OFDM的通信系统中的接收机适于使用从至少一个天线发射的接收的参考信号来执行信道估计。参考信号基本上位于包括多于两个OFDM符号的传输时间间隔的至少两个OFDM符号中。 所述参考信号的功率电平在所述传输时间间隔中被划分为所述非连续OFDM符号，并且适于在当前传输时间中除了参考符号之外，使用位于后续传输时间间隔中的第一OFDM符号中的参考信号 间隔和之前的传输时间间隔。

    Interference cancellation among wireless units using Gibbs sampling
    80.
    发明授权
    Interference cancellation among wireless units using Gibbs sampling 有权
    使用Gibbs采样的无线单元之间的干扰消除

    公开(公告)号：US06725025B1

    公开(公告)日：2004-04-20

    申请号：US09665843

    申请日：2000-09-20

    申请人： Timothy M. Schmidl ,  Alan Gatherer ,  Xiaodong Wang ,  Rong Chen

    发明人： Timothy M. Schmidl ,  Alan Gatherer ,  Xiaodong Wang ,  Rong Chen

    IPC分类号： H04B106

    CPC分类号： H04B1/71075 ,  H04L25/067

    摘要： An improved interference cancellation technique is disclosed. Digital baseband circuitry (40) includes user and symbol detection circuitry (50) for performing a Gibbs sampler type of interference cancellation, either embodied in custom hardware (44) or in software. Random initial guesses for a signal sample (either a symbol or chip) are made for each user. Interference cancellation is performed on a user-by-user basis, using the then-current data decision values for the other, interfering users. A soft data decision is used to derive a probability distribution function for the actual data decision for the sample for the user. A randomly selected value is applied against the probability distribution function to generate the next data decision value for that user, and the process is repeated until convergence. Following convergence, a statistic is used to select a final data decision value for each user, from the set of intermediate data decision values stored in memory.

    摘要翻译： 公开了一种改进的干扰消除技术。 数字基带电路（40）包括用于执行Gibbs采样器类型的干扰消除的用户和符号检测电路（50），或者体现在定制硬件（44）中或软件中。 为每个用户制作信号样本（符号或芯片）的随机初始猜测。 干扰消除是在逐个用户的基础上，使用当时的其他干扰用户的当前数据判定值进行的。 软数据决策用于导出用于用户的样本的实际数据决定的概率分布函数。 对概率分布函数应用随机选择的值以生成该用户的下一个数据判定值，并重复该过程直到收敛。 收敛后，根据存储在存储器中的一组中间数据判定值，使用统计量为每个用户选择最终数据判定值。