公开(公告)号：US20130101055A1

公开(公告)日：2013-04-25

申请号：US13656694

申请日：2012-10-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Tarkesh Pande ,  Anand Dabak ,  Kumaran Vijayasankar ,  Ramanuja Venantham ,  Il Han Kim

IPC: H04B3/54

CPC classification number: H04B3/54 ,  H04B2203/5416 ,  H04L5/0094 ,  H04L27/04 ,  H04L27/18 ,  H04L27/2602 ,  H04L27/32

Abstract: Systems and methods for routing protocols for power line communications (PLC) are described. In some embodiments, a method performed by a PLC device, such as a PLC meter, may include selecting one or more transmit sub-bands on which to transmit frames, where the transmit sub-bands comprise groups of six carrier frequencies. The PLC device then generates a frame comprising a tone map that indicates which transmit sub-bands are used to carry data for the frame. The tone map using two bits per transmit sub-band to indicate a status of each transmit sub-band. The PLC device then transmits the frame on the selected transmit sub-bands using OFDM. A resolution bit and a mode bit may be used to provide additional information about the transmit sub-bands, such as an amount of power adjustment that has been applied to carrier frequencies and whether dummy bits are transmitted on unused carrier frequencies.

Abstract translation: 描述了用于电力线通信（PLC）的路由协议的系统和方法。 在一些实施例中，由诸如PLC计量器之类的PLC设备执行的方法可以包括选择一个或多个在其上发射帧的发射子带，其中发射子带包括六个载波频率的组。 然后，PLC设备生成包括音调映射的帧，该音调映射指示哪些发送子带被用于携带用于该帧的数据。 每个发送子带使用两位的色调映射表示每个发送子带的状态。 然后，PLC设备使用OFDM在所选择的发送子带上发送帧。 可以使用分辨率位和模式位来提供关于发射子带的附加信息，例如已经应用于载波频率的功率调整量以及在未使用的载波频率上是否发送虚拟位。

公开(公告)号：US20240344862A1

公开(公告)日：2024-10-17

申请号：US18751549

申请日：2024-06-24

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand Dabak ,  Clive Bittlestone

IPC: G01F1/66 ,  G01F1/667 ,  G01F15/061 ,  H04Q9/00

CPC classification number: G01F1/66 ,  G01F1/667 ,  G01F15/061 ,  H04Q9/00 ,  H04Q2209/60

Abstract: A flow meter ultrasonically measures fluid velocity in a pipe and ultrasonically transmits fluid flow data along the pipe. An ultrasonic transducer used for fluid velocity measurement may optionally also be used for communication of flow data, and optionally, the ultrasonic frequency for fluid velocity measurement may be the same as the ultrasonic frequency for communication of flow data.

公开(公告)号：US11747181B2

公开(公告)日：2023-09-05

申请号：US17574650

申请日：2022-01-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand Dabak ,  Venkata Ramanan

IPC: G01F1/66 ,  G01F1/667 ,  G06F17/15

CPC classification number: G01F1/66 ,  G01F1/662 ,  G01F1/667 ,  G06F17/15

Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.

公开(公告)号：US11438197B2

公开(公告)日：2022-09-06

申请号：US17096045

申请日：2020-11-12

Applicant: Texas Instruments Incorporated

Inventor： Anand Dabak ,  Mahmoud Abdelmoneim Abdelmoneim Elgenedy ,  Timothy Mark Schmidl ,  Swaminathan Sankaran

IPC: H04L25/03 ,  H04B3/32

Abstract: In described examples of a signal equalizer, a complex signal having a first signal component and a second signal component is received from a communication channel. Adaptive equalization of crosstalk between the first signal component and the second signal component is performed using a single complex tap of a feedforward equalizer. A feedforward filter with real only taps converts the channel into a minimum phase channel that has postcursor interference only so that a low complexity decision feedback filter with all complex taps can easily eliminate the postcursor interreference.

公开(公告)号：US20210266039A1

公开(公告)日：2021-08-26

申请号：US17315488

申请日：2021-05-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Badri N Varadarajan ,  Anand Dabak ,  II Han Kim

IPC: H04B3/54 ,  H04L29/06 ,  H04L1/00 ,  H04L29/08

Abstract: In a disclosed embodiment, a power line communication (PLC) transmitter includes a forward error correction (FEC) encoder that receives payload data and adds parity information to the data to create an encoded output, a fragmenter that receives the encoded output from the FEC encoder and segments the encoded output into a plurality of fragments, a fragment repetition encoder that receives the plurality of fragments from the fragmenter and copies each of the fragments a selected number of times, and an interleaver that receives the copies of the plurality of fragments from the fragment repetition encoder and interleaves the copies of the plurality of fragments for transmission on a power line.

公开(公告)号：US10330508B2

公开(公告)日：2019-06-25

申请号：US14964172

申请日：2015-12-09

Applicant: Texas Instruments Incorporated

Inventor： Amardeep Sathyanarayana ,  Anand Dabak ,  David Patrick Magee

IPC: G01F1/66

Abstract: A method of ultrasound flow metering includes applying a first and second pulse train to an ultrasound transducer pair (T1, T2) positioned for coupling ultrasonic waves therebetween. Responsive to the first pulse train applied to T1, T1 transmits an ultrasonic wave received as received ultrasonic wave (R12) by T2 after propagating through fluid in a pipe. Responsive to the second pulse train applied to T2, T2 transmits an ultrasonic wave received as received ultrasonic wave by (R21) T1 after propagating through the fluid. During the pulse trains, R12 and R21 build up in amplitude to provide excitation portions. The pulse trains are terminated, so that R12 and R21 decay as a damped free oscillation. Windowing is applied to R12 and R21 to generate windowed portions. A signal delay between t12 and t21 (ΔTOF) is calculated using only windowed portions, and a fluid flow is calculated from the ΔTOF.

公开(公告)号：US09689726B2

公开(公告)日：2017-06-27

申请号：US13928562

申请日：2013-06-27

Applicant: Texas Instruments Incorporated

Inventor： Venkata Ramanan Ramamurthy ,  Anand Dabak

IPC: G01F1/00 ,  G01F7/00 ,  G01F1/66 ,  G06F17/15

CPC classification number: G01F1/66 ,  G01F1/668 ,  G06F17/15

Abstract: A flow meter ultrasonically measures fluid velocity in a pipe. Ultrasonic signals received by ultrasonic transducers are digitized. The difference between two ultrasonic propagation times is determined by computing a discrete cross-correlation of the digitized received signals. Computation time is reduced by computing only a few cross-correlation values near a peak cross-correlation value.

公开(公告)号：US20160233923A1

公开(公告)日：2016-08-11

申请号：US15045909

申请日：2016-02-17

Applicant: Texas Instruments Incorporated

Inventor： Ramanuja Vedantham ,  Anand Dabak ,  Tarkesh Pande

IPC: H04B3/54 ,  H04L5/14

CPC classification number: H04B3/54 ,  H04B3/546 ,  H04B2203/5408 ,  H04B2203/5433 ,  H04B2203/5445 ,  H04L5/14

Abstract: Systems and methods for enabling co-existence among power line communications (PLC) technologies are described. In some embodiments, a method performed by a PLC device, such as a PLC gateway, may include searching for and detecting a co-existence preamble on a PLC network while not transmitting or receiving frames. The device waits a time period before attempting transmission of a frame if the coexistence preamble is detected and is not followed by a native preamble. Transmissions are resumed to the PLC network after expiration of the time period.

Abstract translation: 描述了实现电力线通信（PLC）技术共存的系统和方法。 在一些实施例中，由诸如PLC网关的PLC设备执行的方法可以包括在不发送或接收帧的情况下在PLC网络上搜索和检测共存前导码。 如果检测到共存前导码，则设备在尝试发送帧之前等待一段时间，并且不跟随本机前同步码。 传输在该时间段到期后恢复到PLC网络。

公开(公告)号：US20150319272A1

公开(公告)日：2015-11-05

申请号：US14798576

申请日：2015-07-14

Applicant: Texas Instruments Incorporated

Inventor： Badri N. Varadarajan ,  Anand Dabak ,  Il Han Kim

IPC: H04L29/06 ,  H04B3/54

CPC classification number: H04B3/54 ,  H04L1/0041 ,  H04L1/0071 ,  H04L69/22 ,  H04L69/323

Abstract: Embodiments of the invention provide a device and a frame structure for powerline communications. The header may comprise two parts that are separately encoded. A common header segment is encoded alone, and an embedded header segment is encoded with payload data

Abstract translation: 本发明的实施例提供一种用于电力线通信的装置和框架结构。 标题可以包括分开编码的两个部分。 公共头段被单独编码，并且嵌入的标题段用有效载荷数据进行编码

公开(公告)号：US20230421201A1

公开(公告)日：2023-12-28

申请号：US18460837

申请日：2023-09-05

Applicant: Texas Instruments Incorporated

Inventor： Badri N. Varadarajan ,  Anand Dabak ,  II Han Kim

IPC: H04B3/54 ,  H04L69/22 ,  H04L1/00 ,  H04L69/323

CPC classification number: H04B3/54 ,  H04L69/22 ,  H04L1/0041 ,  H04L1/0071 ,  H04L69/323

Abstract: In a disclosed embodiment, a power line communication (PLC) transmitter includes a forward error correction (FEC) encoder that receives payload data and adds parity information to the data to create an encoded output, a fragmenter that receives the encoded output from the FEC encoder and segments the encoded output into a plurality of fragments, a fragment repetition encoder that receives the plurality of fragments from the fragmenter and copies each of the fragments a selected number of times, and an interleaver that receives the copies of the plurality of fragments from the fragment repetition encoder and interleaves the copies of the plurality of fragments for transmission on a power line.