公开(公告)号：US20190312649A1

公开(公告)日：2019-10-10

申请号：US16376504

申请日：2019-04-05

Applicant: Maxlinear, Inc.

Inventor： Ioannis Spyropoulos ,  Anand Anandakumar

IPC: H04B10/564 ,  H04B1/04

Abstract: A system comprises a digital predistortion circuit comprising: a first quantity of delay circuits configured to delay a signal to be predistorted; a second quantity of filter tap circuits, wherein the second quantity is smaller than the first quantity; and a delay-to-filter-taps mapping circuit that is operable to map each output of a first subset of the delay circuits to a corresponding input of the filter tap circuits. The system may comprise circuitry operable to select which of the first quantity of delay circuits is in the first subset. The selection of which of the first quantity of delay circuits is in the first subset may be based on a temperature measurement. The digital predistortion circuit may comprise cross-term generation circuitry operable to generate cross-term signals corresponding to the cross products of multiple, differently-delayed versions of a signal input to the digital predistortion circuit.

公开(公告)号：US20190296929A1

公开(公告)日：2019-09-26

申请号：US16356077

申请日：2019-03-18

Applicant: Maxlinear, Inc.

Inventor： Mario Milicevic ,  Ioannis Spyropoulos

IPC: H04L12/28 ,  H04B1/10 ,  H03F1/32 ,  H03F3/24

Abstract: A transmitter is configured to generate a DOCSIS signal for transmission onto a frequency-selective coaxial cable. The transmitter comprises a first reverse tilt filter circuit, a digital predistortion circuit, a forward tilt filter, a wideband equalizer, a second reverse tilt filter, and a power amplifier. The responses of the tilt filters may be set based on the frequency response of the frequency-selective coaxial cable to which the transmitter is intended to be coupled. The predistortion circuit may compensate for distortion introduced by circuitry of the transmitter. The equalizer circuit may be operable to compensate for undesired linear response of other circuitry of the transmitter.

公开(公告)号：US10389449B2

公开(公告)日：2019-08-20

申请号：US16135338

申请日：2018-09-19

Applicant: Maxlinear, Inc.

Inventor： Curtis Ling ,  Anand Anandakumar ,  Ioannis Spyropoulos

IPC: H04B10/2507 ,  H04B10/40 ,  H04B10/516 ,  H04B10/58 ,  H04B10/69 ,  H04B10/079 ,  H04B10/2513

Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a predistortion module, a feedback subsystem, a transmit optical subsystem, and an external modulator. The predistortion module is operable to receive an input digital signal and modify the input digital signal to produce a digital predistorted signal. The transmit optical subsystem is operable to generate an optical signal from the digital predistorted signal. The modification of the input digital signal is dynamically controlled by the feedback subsystem according to one or more characteristics of the optical signal as determined by the feedback subsystem. The amplitude of the external modulator output is also dynamically controlled by the feedback subsystem.

公开(公告)号：US20190013867A1

公开(公告)日：2019-01-10

申请号：US16135338

申请日：2018-09-19

Applicant: Maxlinear, Inc.

Inventor： Curtis Ling ,  Anand Anandakumar ,  Ioannis Spyropoulos

IPC: H04B10/40 ,  H04B10/2513 ,  H04B10/69 ,  H04B10/516 ,  H04B10/2507 ,  H04B10/079 ,  H04B10/58

CPC classification number: H04B10/40 ,  H04B10/0795 ,  H04B10/2507 ,  H04B10/25133 ,  H04B10/516 ,  H04B10/58 ,  H04B10/6911

Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a predistortion module, a feedback subsystem, a transmit optical subsystem, and an external modulator. The predistortion module is operable to receive an input digital signal and modify the input digital signal to produce a digital predistorted signal. The transmit optical subsystem is operable to generate an optical signal from the digital predistorted signal. The modification of the input digital signal is dynamically controlled by the feedback subsystem according to one or more characteristics of the optical signal as determined by the feedback subsystem. The amplitude of the external modulator output is also dynamically controlled by the feedback subsystem.

公开(公告)号：US20180294879A1

公开(公告)日：2018-10-11

申请号：US16008758

申请日：2018-06-14

Applicant: Maxlinear, Inc.

Inventor： Anand Anandakumar ,  Ioannis Spyropoulos ,  Curtis Ling

IPC: H04B10/2507 ,  H04B10/40 ,  H04B10/079 ,  H04B10/58

Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a digital-to-analog converter (DAC), a driver, and a transmit optical subsystem. The DAC is operable to receive a digital code of a plurality of digital codes and output an analog current signal having an analog current level of a plurality of analog current levels. The driver is operable to condition the analog current signal output from the digital-to-analog converter. The transmit optical subsystem is operable to generate an optical signal from the conditioned analog current signal. A digital modification of an input digital signal is dynamically controlled by a feedback path according to one or more characteristics of the optical signal. The one or more characteristics comprise a nonlinearity that may be temperature dependent.

公开(公告)号：US20180234740A1

公开(公告)日：2018-08-16

申请号：US15888705

申请日：2018-02-05

Applicant: MaxLinear, Inc.

Inventor： Anand Anandakumar ,  Ioannis Spyropoulos ,  Meetul Parikh

IPC: H04N21/647 ,  H04N21/438 ,  H04N21/442 ,  H04N21/61

CPC classification number: H04N21/64738 ,  H04N21/438 ,  H04N21/44209 ,  H04N21/6143

Abstract: Methods and systems are provided for using priori knowledge of noise in controlling signal receivers. In a signal receiver, one or more adjustments, relating to generating output signals via the signal receiver, may be determined, with the adjustments directed to one or more particular components of the output signals. When applying the adjustments is determined to cause undesired effects on one or more other components of the output signals, with these other components being intended to remain unchanged when the adjustments are applied, operations of the signal receiver may be controlled based on the undesired effects, with the controlling including mitigating at least some of the effects on the one or more other components of the signals when the one or more adjustments are applied. The adjustments may include frequency re-assignment. The undesired effects may include one or more of amplitude glitches, phase glitches, bit or packet errors, etc.

公开(公告)号：US20180115441A1

公开(公告)日：2018-04-26

申请号：US15839905

申请日：2017-12-13

Applicant: Maxlinear, Inc.

Inventor： Ioannis Spyropoulos ,  Anand Anandakumar

IPC: H04L25/03 ,  H04B1/16

CPC classification number: H04L25/03184 ,  H04B1/16

Abstract: An electronic receiver may generate a differential detection sequence based on a received symbol sequence and based on a m-symbol delayed version of the received symbol sequence, where in is an integer greater than 1. The particular differential detection sequence may be a result of an element-by-element multiplication of the particular received symbol sequence and the conjugate of an in-symbol delayed version of the particular received symbol sequence. The receiver may calculate differential decision metrics based on the differential detection sequence and based on a set of differential symbol sequences generated from the set of possible transmitted symbol sequences. The receiver may generate a decision as to which of a set of possible transmitted symbol sequences resulted in the received symbol sequence, where the decision is based on the differential decision metrics and the set of possible transmitted symbols sequences.

公开(公告)号：US20170324467A1

公开(公告)日：2017-11-09

申请号：US15494684

申请日：2017-04-24

Applicant: Maxlinear, Inc.

Inventor： Maxime Leclercq ,  Ioannis Spyropoulos ,  Nishant Kumar

IPC: H04B7/185 ,  G01S19/13 ,  G01S19/42 ,  H04W4/02 ,  H04W64/00 ,  H04W84/04

CPC classification number: H04B7/18554 ,  G01S19/13 ,  G01S19/425 ,  H04W4/021 ,  H04W64/003 ,  H04W84/045

Abstract: Methods and systems for femtocell positioning using low Earth orbit (LEO) satellite signals may comprise receiving an initial position of a wireless communication device (WCD) as entered by as user, service provider, or manufacturer, wherein the WCD comprises a LEO satellite signal receiver path (Rx). The WCD may be operable to provide wireless communication services to other WCDs. LEO signals may be received for determining a position of the WCD, which may be compared to a threshold radius defined by the initial position. The communication services may be enabled when the measured position is within the threshold radius. The WCD may comprise a femtocell device, a WiFi access point, or may provide cellular telephone service to the other WCDs. The position of the WCD may be measured upon powering up of the WCD, on a periodic basis, and/or when one or more motion sensors in the WCD detect motion.

公开(公告)号：US09565038B2

公开(公告)日：2017-02-07

申请号：US15006327

申请日：2016-01-26

Applicant: Maxlinear, Inc.

Inventor： Ioannis Spyropoulos ,  Anand Anandakumar

IPC: H01L25/03 ,  H04L25/03 ,  H04B1/16

CPC classification number: H04L25/03184 ,  H04B1/16

Abstract: An electronic receiver may generate a differential detection sequence based on a received symbol sequence and based on a m-symbol delayed version of the received symbol sequence, where m is an integer greater than 1. The particular differential detection sequence may be a result of an element-by-element multiplication of the particular received symbol sequence and the conjugate of an m-symbol delayed version of the particular received symbol sequence. The receiver may calculate differential decision metrics based on the differential detection sequence and based on a set of differential symbol sequences generated from the set of possible transmitted symbol sequences. The receiver may generate a decision as to which of a set of possible transmitted symbol sequences resulted in the received symbol sequence, where the decision is based on the differential decision metrics and the set of possible transmitted symbols sequences.

Abstract translation: 电子接收机可以基于接收到的符号序列并基于接收符号序列的m符号延迟版本来生成差分检测序列，其中m是大于1的整数。特定的差分检测序列可以是 特定接收符号序列的逐个元素乘法和特定接收符号序列的m符号延迟版本的共轭。 接收机可以基于差分检测序列并且基于从该组可能发送的符号序列生成的一组差分符号序列来计算差分决策度量。 接收机可以产生关于一组可能的传输符号序列中的哪一个导致接收到的符号序列的决定，其中该决定基于差分决策度量和可能发送的符号序列的集合。

公开(公告)号：US20160352427A1

公开(公告)日：2016-12-01

申请号：US15164534

申请日：2016-05-25

Applicant: Maxlinear, Inc.

Inventor： Anand Anandakumar ,  Ioannis Spyropoulos ,  Curtis Ling

IPC: H04B10/2507 ,  H04B10/58 ,  H04B10/079

CPC classification number: H04B10/2507 ,  H04B10/0795 ,  H04B10/0799 ,  H04B10/40 ,  H04B10/564 ,  H04B10/58

Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a digital-to-analog converter (DAC), a driver, and a transmit optical subsystem. The DAC is operable to receive a digital code of a plurality of digital codes and output an analog current signal having an analog current level of a plurality of analog current levels. The driver is operable to condition the analog current signal output from the digital-to-analog converter. The transmit optical subsystem is operable to generate an optical signal from the conditioned analog current signal. A digital modification of an input digital signal is dynamically controlled by a feedback path according to one or more characteristics of the optical signal. The one or more characteristics comprise a nonlinearity that may be temperature dependent.

Abstract translation: 提供了在光通信期间的反馈方法和系统的方面。 在一个实施例中，用于光通信的系统包括数模转换器（DAC），驱动器和发射光学子系统。 DAC可操作地接收多个数字代码的数字代码并输出具有多个模拟电流电平的模拟电流电平的模拟电流信号。 驱动器可操作以调节从数模转换器输出的模拟电流信号。 发射光学子系统可操作以从经调节的模拟电流信号产生光信号。 根据光信号的一个或多个特性，通过反馈路径来动态地控制输入数字信号的数字修改。 一个或多个特征包括可能是温度依赖性的非线性。