公开(公告)号：US06404826B1

公开(公告)日：2002-06-11

申请号：US09218939

申请日：1998-12-22

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

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

IPC分类号： H04L2706

CPC分类号： H04B1/7097 ,  H04L1/20

摘要： A circuit is designed with an estimate circuit (132) coupled to receive a plurality of predetermined signals (416-418) from an external source. Each of the predetermined signals is spaced apart in time. The estimate cit produces a first estimate signal in response to at least one of the plurality of predetermined signals. An averaging circuit is coupled to receive a data signal 420 and at least one of the plurality of predetermined signals. The averaging circuit produces an average signal from the data signal and at least one of the plurality of predetermined signals.

摘要翻译： 电路被设计成具有耦合以从外部源接收多个预定信号（416-418）的估计电路（132）。 每个预定信号在时间上间隔开。 估计值响应于多个预定信号中的至少一个产生第一估计信号。 平均电路被耦合以接收数据信号420和多个预定信号中的至少一个。 平均电路从数据信号和多个预定信号中的至少一个产生平均信号。

公开(公告)号：US08767848B2

公开(公告)日：2014-07-01

申请号：US13335705

申请日：2011-12-22

申请人： Taejoon Kim ,  Timothy M. Schmidl

发明人： Taejoon Kim ,  Timothy M. Schmidl

IPC分类号： H04L27/28 ,  H04L25/02 ,  H04J11/00 ,  H04L27/26 ,  H04L5/00

CPC分类号： H04J11/0079 ,  H04L5/0044 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/262 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695

摘要： In at least some embodiments, a receiver includes channel estimation logic configured to a process a long training field symbol having a doubled cyclic prefix. The channel estimation logic is configured to vary an amount of the doubled cyclic prefix used for channel estimation. Further, in some embodiments, a wireless communication device includes logic to enable communications based on at least two long training field symbols having a doubled cyclic prefix as part of a synchronization header. Further, in some embodiments, a method includes receiving a long training field symbol having a synchronization header with a doubled cyclic prefix and varying an amount of the doubled cyclic prefix used for channel estimation.

摘要翻译： 在至少一些实施例中，接收机包括被配置成具有双重循环前缀的长训练场符号的处理的信道估计逻辑。 信道估计逻辑被配置为改变用于信道估计的双倍循环前缀的量。 此外，在一些实施例中，无线通信设备包括基于具有双重循环前缀的至少两个长训练场符号进行通信的逻辑，作为同步头部的一部分。 此外，在一些实施例中，一种方法包括接收具有双重循环前缀的同步头部并改变用于信道估计的双倍循环前缀的量的长训练场符号。

公开(公告)号：US08553730B2

公开(公告)日：2013-10-08

申请号：US12868397

申请日：2010-08-25

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

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

IPC分类号： H04J3/06

CPC分类号： H04W56/001 ,  H04L27/2613 ,  H04L27/2634 ,  H04W4/80

摘要： A method includes receiving a first plurality of symbols comprising complex portions. The method further includes applying conjugate symmetry to the first plurality of symbols, producing a second plurality of symbols comprising no complex portions. The method further includes transforming the second plurality of symbols using an inverse fast Fourier transform, producing a third plurality of symbols. The method further includes interpolating the third plurality of symbols, generating a short training field comprising at least one real portion of the third plurality of symbols, generating a long training field comprising at least one real portion of the third plurality of symbols, and transmitting the short training field and long training field in a WPAN.

摘要翻译： 一种方法包括接收包括复数部分的第一多个符号。 该方法还包括将共轭对称性应用于第一多个符号，产生不包含复杂部分的第二多个符号。 该方法还包括使用快速傅里叶反变换来变换第二多个符号，产生第三个多个符号。 该方法还包括内插第三多个符号，产生包括第三多个符号的至少一个实部的短训练场，产生包括第三多个符号的至少一个实部的长训练场，并发送 短期培训领域和长期培训领域的WPAN。

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。

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。

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。

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。

公开(公告)号：US08488655B2

公开(公告)日：2013-07-16

申请号：US12760516

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： H04B1/40

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 transmit and receive data in a frequency band selected from the group consisting of: 402-405 MHz, 420-450 MHz, 863-870 MHz, 902-928 MHz, 950-956 MHz, 2360-2400 MHz, and 2400-2483.5 MHz.

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。

公开(公告)号：US07113499B2

公开(公告)日：2006-09-26

申请号：US09820152

申请日：2001-03-28

申请人： Mohammed Nafie ,  Anand Dabak ,  Timothy M. Schmidl

发明人： Mohammed Nafie ,  Anand Dabak ,  Timothy M. Schmidl

IPC分类号： H04J3/24

CPC分类号： H04L1/0026 ,  H04L1/0001 ,  H04L1/0015 ,  H04L1/0034

摘要： A wireless communication transmission channel estimation by initial data exchange to determine calibration factors to apply to tracked channel estimations from received transmissions.

摘要翻译： 通过初始数据交换的无线通信传输信道估计，以确定适用于从接收到的传输的跟踪信道估计的校准因子。