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    PHY layer PPDU construction for body area network (BAN) devices
    2.
    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。

    Packet detection and coarse symbol timing for rotated differential M-ary PSK modulated preamble signal
    4.
    发明授权
    Packet detection and coarse symbol timing for rotated differential M-ary PSK modulated preamble signal 有权
    分组检测和用于旋转差分M-ary PSK调制前同步码信号的粗符号定时

    公开(公告)号：US08630374B2

    公开(公告)日：2014-01-14

    申请号：US12881924

    申请日：2010-09-14

    申请人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    发明人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H03D3/22

    CPC分类号： H04L27/227 ,  H04L7/042 ,  H04L7/10 ,  H04L27/2071 ,  H04L27/2078 ,  H04L2027/0038 ,  H04L2027/0095

    摘要： A packet detection and coarse symbol timing recovery system for preamble signal modulated with rotated differential M-ary phase shift key (PSK) modulation includes a differential detection unit, to provide a symbol signal responsive to a received signal. A preamble sequence correlator performs a preamble sequence correlation on the symbol signal to produce a correlator signal. A metric calculation unit performs a metric calculation on the correlator signal to produce a metric. A packet detection unit determines that a packet is detected and produces a sample index. A coarse symbol timing unit finds a peak of the calculated metric signal outputs a sample index for the peak as coarse symbol timing information. The sample indexes are used in processing a physical layer convergence procedure (PLCP) header and physical layer service data unit (PSDU) block.

    摘要翻译： 用于利用旋转的差分M相移键（PSK）调制调制的前同步信号的分组检测和粗略符号定时恢复系统包括差分检测单元，以响应于接收到的信号提供符号信号。 前序序列相关器在符号信号上执行前同步码序列相关，以产生相关器信号。 度量计算单元对相关器信号执行度量计算以产生度量。 分组检测单元确定检测到分组并产生样本索引。 粗略符号定时单元发现所计算的度量信号的峰值将峰值的采样索引作为粗略符号定时信息输出。 样本索引用于处理物理层收敛过程（PLCP）头和物理层服务数据单元（PSDU）块。

    System and method for scrambling and time-hopping
    5.
    发明授权
    System and method for scrambling and time-hopping 有权
    用于加扰和跳时的系统和方法

    公开(公告)号：US08699471B2

    公开(公告)日：2014-04-15

    申请号：US13087848

    申请日：2011-04-15

    申请人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    发明人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H04J3/00

    CPC分类号： H04B1/7176 ,  H04B2001/6908

    摘要： A system and method for scrambling and time-hopping in an ultra-wideband wireless network. In one embodiment, a wireless device includes a symbol mapper and a dynamic chip scrambler. The dynamic chip scrambler is configured to scramble each of a plurality of consecutive bursts of a time-hopped packet according to a pseudo-random scrambling sequence that varies from burst to burst.

    摘要翻译： 一种用于在超宽带无线网络中进行加扰和跳时的系统和方法。 在一个实施例中，无线设备包括符号映射器和动态芯片加扰器。 动态码片扰频器被配置为根据从突发到突发不同的伪随机扰频序列来对每个跳时间分组的连续脉冲串进行加扰。

    Ultra wideband modulation for body area networks
    6.
    发明授权
    Ultra wideband modulation for body area networks 有权

    公开(公告)号：US08605770B2

    公开(公告)日：2013-12-10

    申请号：US12702628

    申请日：2010-02-09

    申请人： June Chul Roh ,  Anuj Batra ,  Sudipto Chakraborty ,  Srinath Hosur

    发明人： June Chul Roh ,  Anuj Batra ,  Sudipto Chakraborty ,  Srinath Hosur

    IPC分类号： H04B1/00

    CPC分类号： H04B1/69 ,  H04B1/7176 ,  H04B2001/6908

    摘要： A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval.

    Fine symbol timing estimation
    7.
    发明授权
    Fine symbol timing estimation 有权
    精细符号定时估计

    公开(公告)号：US08472569B2

    公开(公告)日：2013-06-25

    申请号：US12961271

    申请日：2010-12-06

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

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

    IPC分类号： H03D1/00 ,  H04L27/06

    CPC分类号： H04L27/205 ,  H04L27/2335

    摘要： Systems and methods for fine symbol timing estimation are disclosed herein. In one embodiment, a wireless receiver includes a differential detector, a correlator, a coarse symbol timing estimator, and a fine symbol timing estimator. The differential detector is configured to detect phase differences in a received preamble signal modulated using differential phase shift keying. The correlator is configured to correlate symbol values output by the differential detector against a reference sequence. The coarse symbol timing estimator is configured to generate a coarse symbol timing estimate, and to generate a coarse timing sample symbol index value corresponding to the coarse symbol timing estimate. The fine symbol timing estimator is configured to generate a fine symbol timing estimate that is more accurate than the coarse symbol timing estimate based on the coarse timing sample symbol index value and correlation samples at index values preceding and succeeding the coarse timing sample index value.

    摘要翻译： 本文公开了用于精细符号定时估计的系统和方法。 在一个实施例中，无线接收机包括差分检测器，相关器，粗略符号定时估计器和精细符号定时估计器。 差分检测器被配置为检测使用差分相移键控调制的接收前导信号中的相位差。 相关器被配置为将由差分检测器输出的符号值与参考序列相关联。 粗略符号定时估计器被配置为产生粗略符号定时估计，并且生成与粗略符号定时估计对应的粗定时采样符号索引值。 精细符号定时估计器被配置为基于粗略定时样本符号索引值和在粗略定时样本索引值之前和之后的索引值处的相关样本，生成比粗略符号定时估计更精确的精细符号定时估计。

    System and method for channel classification
    9.
    发明授权
    System and method for channel classification 有权
    渠道分类的系统和方法

    公开(公告)号：US08649446B2

    公开(公告)日：2014-02-11

    申请号：US13284745

    申请日：2011-10-28

    申请人： Taejoon Kim ,  Timothy M. Schmidl ,  Tarkesh Pande ,  Anuj Batra ,  June Chul Roh

    发明人： Taejoon Kim ,  Timothy M. Schmidl ,  Tarkesh Pande ,  Anuj Batra ,  June Chul Roh

    IPC分类号： H04L27/00

    CPC分类号： H04L25/0212 ,  H04L25/0216 ,  H04L25/0222 ,  H04L27/2601

    摘要： A system and method for classifying a channel with regard to delay spread in a wireless network applying orthogonal frequency division multiplexing. In one embodiment, a wireless receiver includes a channel classifier. The channel classifier is configured to compute a channel estimate corresponding to a channel traversed by a packet received by the wireless receiver. The channel classifier is also configured to partition the channel estimate into a plurality of windows. Each window corresponds to a range of time of the channel estimate. The channel classifier is further configured to assign a delay spread classification to the channel based on a distribution of energy across the windows.

    摘要翻译： 一种用于对采用正交频分复用的无线网络中的延迟扩展对信道进行分类的系统和方法。 在一个实施例中，无线接收机包括信道分类器。 信道分类器被配置为计算与由无线接收机接收的分组所经过的信道相对应的信道估计。 信道分类器还被配置为将信道估计分割成多个窗口。 每个窗口对应于信道估计的时间范围。 信道分类器还被配置为基于跨越窗口的能量分布向信道分配延迟扩展分类。

    Low-complexity tightly-coupled integration filter for sensor-assisted GNSS receiver
    10.
    发明授权
    Low-complexity tightly-coupled integration filter for sensor-assisted GNSS receiver 有权
    用于传感器辅助GNSS接收机的低复杂度紧耦合集成滤波器

    公开(公告)号：US08380433B2

    公开(公告)日：2013-02-19

    申请号：US12568084

    申请日：2009-09-28

    申请人： June Chul Roh ,  Deric W. Waters ,  Srinath Hosur ,  Goutam Dutta

    发明人： June Chul Roh ,  Deric W. Waters ,  Srinath Hosur ,  Goutam Dutta

    IPC分类号： G01C21/10 ,  H04B7/185

    CPC分类号： G01S19/47 ,  G01C21/165 ,  G01C21/28 ,  G01C22/006 ,  G06F17/16

    摘要： Embodiments of the invention provide a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements tightly-coupled integration filter. This blending filter can be easily implemented with minor modification to the position engine of stand-alone GNSS receiver. Provided is a low-complexity tightly-coupled integration filter for sensor-assisted global navigation satellite system (GNSS) receiver. The inertial measurement unit (IMU) contains inertial sensors such as accelerometer, magnetometer, and/or gyroscopes Embodiments also include method for pedestrian dead reckoning (PDR) data conversion for ease of GNSS/PDR integration. The PDR position data is converted to user velocity measured at the time instances where GNSS position/velocity estimates are available.

    摘要翻译： 本发明的实施例提供了一种基于扩展卡尔曼滤波器（EKF）的混合滤波器，其将IMU导航数据与所有其他卫星测量紧密耦合的积分滤波器进行最佳集成。 这种混合滤波器可以通过对独立GNSS接收机的位置引擎的微小修改来轻松实现。 提供了用于传感器辅助的全球导航卫星系统（GNSS）接收机的低复杂度紧耦合集成滤波器。 惯性测量单元（IMU）包含诸如加速度计，磁力计和/或陀螺仪的惯性传感器。实施例还包括用于容易进行GNSS / PDR集成的行人航位推算（PDR）数据转换的方法。 PDR位置数据被转换成在GNSS位置/速度估计可用的时间点测量的用户速度。