公开(公告)号：US20140307813A1

公开(公告)日：2014-10-16

申请号：US14145471

申请日：2013-12-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Reza HOSHYAR ,  Anuj BATRA ,  Timothy Mark SCHMIDL

IPC: H04L25/02 ,  H04L27/26

CPC classification number: H04L25/0202 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/023 ,  H04L27/26 ,  H04L27/2601

Abstract: A device for updating complex channel gain estimates for orthogonal frequency division multiplexed (OFDM) symbols that includes a receiver to receive a plurality of OFDM symbols, wherein each OFDM symbol includes a plurality of pilot tones at a subset of odd positions and a finite impulse response (FIR) filter. The FIR filter configured to filter a plurality of initial channel estimates of odd tones of an OFDM symbol using a first set of coefficients to generate an updated estimate of the channel estimates of the plurality of odd tones for that OFDM symbol, and filter the plurality of the initial channel estimates of the odd tones of the OFDM symbol using a second set of coefficients to generate estimates for a plurality of initial channel estimates of even tones for that OFDM symbol.

Abstract translation: 一种用于更新用于正交频分复用（OFDM）符号的复信道增益估计的装置，其包括用于接收多个OFDM符号的接收机，其中每个OFDM符号包括在奇数位置的子集处的多个导频音调和有限脉冲响应 （FIR）滤波器。 FIR滤波器被配置为使用第一组系数来过滤OFDM符号的奇数音调的多个初始信道估计，以生成用于该OFDM符号的多个奇音调的信道估计的更新估计，并且对多个 使用第二组系数的OFDM符号的奇数音调的初始信道估计来生成用于该OFDM符号的偶数个音调的多个初始信道估计的估计。

公开(公告)号：US20170324595A1

公开(公告)日：2017-11-09

申请号：US15656039

申请日：2017-07-21

Applicant: Texas Instruments Incorporated

Inventor： Wenxun QIU ,  Timothy Mark SCHMIDL

IPC: H04L27/16 ,  H04L27/14

CPC classification number: H04L27/16 ,  H04L27/14

Abstract: Disclosed embodiments include a receiver having an input that receives a frequency shift key (FSK) signal having a preamble comprising preamble symbols, a phase compensator that applies a compensation vector to one of first and second samples of a first preamble symbol, wherein applying the compensation vector to the one of the first and second samples produces a compensated sample, a demodulator that determines a phase offset between the compensated sample and the other one of the first and second samples of the first preamble symbol, and a frequency offset mapper that determines a frequency offset based at least upon the phase offset. The receiver applies the frequency offset to the FSK signal.

公开(公告)号：US20170272118A1

公开(公告)日：2017-09-21

申请号：US15071998

申请日：2016-03-16

Applicant: Texas Instruments Incorporated

Inventor： Srinivas LINGAM ,  Timothy Mark SCHMIDL

IPC: H04B1/7097 ,  H04B1/709

CPC classification number: H04B1/7097 ,  H04B1/707 ,  H04B1/709 ,  H04L1/1671 ,  H04L27/2082 ,  H04L27/22

Abstract: A direct sequence spread spectrum (DSSS) receiver includes an antenna, signal-to-noise ratio (SNR) estimation logic, and preamble detection logic. The antenna is configured to receive a DSSS signal. The SNR estimation logic is configured to estimate SNR of the received DSSS signal. The preamble detection logic is configured to, in response to the SNR estimate exceeding a SNR threshold value, detect a preamble sequence in the DSSS signal based on an absolute value of a sequence of correlation values. The sequence of correlation values is a complex quantity.

公开(公告)号：US20140307841A1

公开(公告)日：2014-10-16

申请号：US14145431

申请日：2013-12-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Reza HOSHYAR ,  Anuj BATRA ,  Timothy Mark SCHMIDL

IPC: H04L27/26 ,  H04B17/00

CPC classification number: H04L27/2647 ,  H04B17/336

Abstract: An orthogonal frequency-division multiplexed (OFDM)-based receiver for channel tracking with signal-to-noise ratio dependent parameters that includes a memory; and a signal processor, coupled to the memory. The signal processor to estimate a signal-to-noise ratio (SNR) for a received packet of OFDM symbols and determine an SNR region in which the SNR estimate falls, wherein the signal processor implements a different set of finite impulse response (FIR) filter coefficients for each SNR region.

Abstract translation: 一种用于信道跟踪的基于正交频分复用（OFDM）的接收机，其具有包括存储器的信噪比相关参数; 以及耦合到存储器的信号处理器。 信号处理器，用于估计接收到的OFDM符号分组的信噪比（SNR），并确定SNR估计下降的SNR区域，其中信号处理器实现不同的一组有限脉冲响应（FIR）滤波器 每个SNR区域的系数。

公开(公告)号：US20140307810A1

公开(公告)日：2014-10-16

申请号：US14048411

申请日：2013-10-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anuj BATRA ,  Timothy Mark SCHMIDL ,  Il Han KIM

IPC: H04L27/26 ,  H04B3/54

CPC classification number: H04L27/2634 ,  H04B3/542 ,  H04B2203/5433 ,  H04L25/03834

Abstract: A smart utility network (SUN) device that includes an orthogonal frequency-division multiplexing (OFDM)-based transmitter. The OFDM-based transmitter including a signal processor to convert data from a frequency-domain to a time-domain using an inverse fast Fourier transform (IFFT) and configured to perform a time-domain windowing function based on a Hanning window on OFDM symbols.

Abstract translation: 一种智能公用事业网络（SUN）装置，其包括基于正交频分复用（OFDM）的发射机。 基于OFDM的发射机包括信号处理器，用于使用逆快速傅里叶变换（IFFT）将数据从频域转换到时域，并被配置为基于OFDM符号上的汉宁窗执行时域加窗函数。