公开(公告)号：US09455851B1

公开(公告)日：2016-09-27

申请号：US14969227

申请日：2015-12-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Mehmet Ali Donmez ,  Anand Ganesh Dabak ,  Il Han Kim ,  Timothy Mark Schmidl

IPC: H04B11/00 ,  H04L27/12 ,  H04L27/144

CPC classification number: H04B11/00 ,  H04L27/122 ,  H04L27/144

Abstract: A method of encoding a data signal is disclosed. The method includes selecting a set of M ultrasonic frequencies, wherein each of the M ultrasonic frequencies differs from an adjacent frequency by at least a first frequency spacing, and wherein M is a positive integer. The method further includes forming a trellis matrix and encoding the data signal with the trellis matrix to form a set of Q of the M ultrasonic frequencies, wherein Q is a positive integer less than M, and wherein a minimum frequency separation between any pair of the Q frequencies of the set is greater than the first frequency spacing.

Abstract translation: 公开了一种对数据信号进行编码的方法。 该方法包括选择一组M个超声波频率，其中每个M个超声波频率与相邻频率不同至少第一频率间隔，并且其中M是正整数。 所述方法还包括形成网格矩阵并且用所述网格矩阵对所述数据信号进行编码，以形成所述M个超声波频率的Q的集合，其中Q是小于M的正整数，并且其中， 该组的Q频率大于第一频率间隔。

公开(公告)号：US09258829B1

公开(公告)日：2016-02-09

申请号：US14582409

申请日：2014-12-24

Applicant: Texas Instruments Incorporated

Inventor： Mostafa Sayed Ibrahim ,  Il Han Kim ,  Tarkesh Pande ,  Anuj Batra ,  Timothy Mark Schmidl ,  Deric Wayne Waters

IPC: H04B3/00 ,  H04W74/08 ,  H04B3/54 ,  H04B7/04

CPC classification number: H04L27/2656 ,  H04B3/54 ,  H04B3/542 ,  H04B3/546 ,  H04B7/0413 ,  H04L1/188 ,  H04L5/0023 ,  H04L7/042 ,  H04L27/26 ,  H04L27/2602 ,  H04L27/2613 ,  H04L27/2655 ,  H04L27/2663 ,  H04W74/0816

Abstract: A PLC network system and method operative with OFDM for generating MIMO frames with suitable preamble portions configured to provide backward compatibility with legacy PLC devices and facilitate different receiver tasks such as frame detection and symbol timing, channel estimation and automatic gain control (AGC), including robust preamble detection in the presence of impulsive noise and frequency-selective channels of the PLC network. To reduce collisions in a network, a MIMO PLC transmitter device may selectively perturb legacy FCH data so as to ensure a maximum back-off time by a legacy PLC receiver.

Abstract translation: 一种PLC网络系统和方法，用于生成具有合适的前导码部分的MIMO帧的OFDM帧，其被配置为提供与传统PLC设备的向后兼容性，并且促进诸如帧检测和符号定时，信道估计和自动增益控制（AGC）的不同接收机任务，包括 在存在脉冲噪声和PLC网络的频率选择性通道的情况下进行鲁棒前同步码检测。 为了减少网络中的冲突，MIMO PLC发射机设备可以选择性地干扰传统的FCH数据，以便确保传统的PLC接收机的最大退避时间。

公开(公告)号：US09231648B2

公开(公告)日：2016-01-05

申请号：US14638299

申请日：2015-03-04

Applicant: Texas Instruments Incorporated

Inventor： Srinivas Lingam ,  Timothy Mark Schmidl

IPC: H04B1/7075

CPC classification number: H04B1/7075 ,  H04B1/7087 ,  H04L25/02

Abstract: Methods and apparatus for frequency offset estimation and correction prior to preamble detection of DSSS signals. An integrated circuit is disclosed including a receiver circuit having an input coupled to receive a DSSS signal, the receiver circuit configured to sample the DSSS signal and to output a sequence of digital samples; carrier frequency offset estimation logic configured to perform a carrier frequency offset estimation on the digital samples; carrier frequency correction logic configured to correct the carrier frequency of the sequence of digital samples using the carrier frequency offset estimation and to output a sequence of corrected digital samples; offset quadrature phase shift keying (O-QPSK) demodulation logic configured to perform demodulation on the corrected digital samples and further configured to output symbols corresponding to the corrected digital samples; and preamble identification configured to identify and detect a preamble sequence in the symbols. Additional methods and apparatus are disclosed.

Abstract translation: DSSS信号前导码检测前频偏估计和校正的方法和装置。 公开了一种集成电路，其包括具有耦合以接收DSSS信号的输入的接收器电路，所述接收器电路被配置为对DSSS信号进行采样并输出数字采样序列; 载波频率偏移估计逻辑，被配置为对所述数字样本执行载波频率偏移估计; 载波频率校正逻辑，被配置为使用载波频率偏移估计来校正数字样本序列的载波频率，并输出校正的数字样本序列; 偏移正交相移键控（O-QPSK）解调逻辑，被配置为对所述经校正的数字样本执行解调，并且还被配置为输出与所述经校正的数字样本相对应的符号; 以及前导码识别，被配置为识别和检测符号中的前导码序列。 公开了附加的方法和装置。

公开(公告)号：US20150349823A1

公开(公告)日：2015-12-03

申请号：US14821264

申请日：2015-08-07

Applicant: Texas Instruments Incorporated

Inventor： Wenxun Qiu ,  Timothy Mark Schmidl ,  Minghua Fu ,  Anuj Batra

IPC: H04B1/12 ,  H04B17/20

CPC classification number: H04B1/123 ,  H03G3/3078 ,  H03G3/3089 ,  H03M3/042 ,  H04B7/0811 ,  H04B17/20 ,  H04L27/14

Abstract: A wireless network receiver includes a detection module that uses preamble data in a data frame for signal processing functions and the detection module is configured to adjust the number of preamble data bits that are used based on the power of a received signal.

Abstract translation: 无线网络接收机包括检测模块，该检测模块使用用于信号处理功能的数据帧中的前导码数据，并且所述检测模块被配置为基于接收到的信号的功率来调整所使用的前导码数据位的数目。

公开(公告)号：US20150341078A1

公开(公告)日：2015-11-26

申请号：US14638299

申请日：2015-03-04

Applicant: Texas Instruments Incorporated

Inventor： Srinivas Lingam ,  Timothy Mark Schmidl

IPC: H04B1/7075

CPC classification number: H04B1/7075 ,  H04B1/7087 ,  H04L25/02

Abstract: Methods and apparatus for frequency offset estimation and correction prior to preamble detection of DSSS signals. An integrated circuit is disclosed including a receiver circuit having an input coupled to receive a DSSS signal, the receiver circuit configured to sample the DSSS signal and to output a sequence of digital samples; carrier frequency offset estimation logic configured to perform a carrier frequency offset estimation on the digital samples; carrier frequency correction logic configured to correct the carrier frequency of the sequence of digital samples using the carrier frequency offset estimation and to output a sequence of corrected digital samples; offset quadrature phase shift keying (O-QPSK) demodulation logic configured to perform demodulation on the corrected digital samples and further configured to output symbols corresponding to the corrected digital samples; and preamble identification configured to identify and detect a preamble sequence in the symbols. Additional methods and apparatus are disclosed.

Abstract translation: DSSS信号前导码检测前频偏估计和校正的方法和装置。 公开了一种集成电路，其包括具有耦合以接收DSSS信号的输入的接收器电路，所述接收器电路被配置为对DSSS信号进行采样并输出数字采样序列; 载波频率偏移估计逻辑，被配置为对所述数字样本执行载波频率偏移估计; 载波频率校正逻辑，被配置为使用载波频率偏移估计来校正数字样本序列的载波频率，并输出校正的数字样本序列; 偏移正交相移键控（O-QPSK）解调逻辑，被配置为对所述经校正的数字样本执行解调，并且还被配置为输出与所述经校正的数字样本相对应的符号; 以及前导码识别，被配置为识别和检测符号中的前导码序列。 公开了附加的方法和装置。