公开(公告)号：US11923991B2

公开(公告)日：2024-03-05

申请号：US17103259

申请日：2020-11-24

Applicant: QUALCOMM Incorporated

Inventor： Satish Kumar ,  Siva Naga Raju Undrakunta ,  Harika Lavanuru ,  Sarath Pinayour Chandrasekaran ,  Loksiva Paruchuri ,  Ashok Kumar Tripathi ,  Raja Sekhar Bachu

IPC: H04L1/24 ,  H04L1/20 ,  H04L5/00

CPC classification number: H04L1/248 ,  H04L1/206 ,  H04L5/0048 ,  H04L5/0051

Abstract: Certain aspects of the present disclosure provide techniques for dynamic configuration of demodulation reference signals (DMRSs). A method that may be performed by a base station (BS) includes receiving one or more uplink signals from at least one user equipment (UE); estimating a Doppler shift associated with the one or more uplink signals; determining a density of reference signals (RSs) within a slot for the at least one UE based, at least in part, on the estimated Doppler shift associated with the one or more uplink signals; and transmitting information to the at least one UE indicating an allocation of RS resources for the UE, wherein the allocation of the RS resources is based on the density of the RSs for the at least one UE.

公开(公告)号：US20190222310A1

公开(公告)日：2019-07-18

申请号：US16125824

申请日：2018-09-10

Applicant: ARCOM DIGITAL, LLC

Inventor： Victor M. Zinevich

IPC: H04B10/079 ,  H04B10/2575 ,  H04B10/2507

CPC classification number: H04B10/0795 ,  G01R23/20 ,  G01R31/2822 ,  H04B3/487 ,  H04B10/2507 ,  H04B10/25751 ,  H04L1/248 ,  H04M3/304

Abstract: Detecting PIM in a downstream signal, wherein the downstream signal is received from a cable plant via a subscriber network and an upstream signal is transmitted to the cable plant via the subscriber network. The upstream signal is transmitted in bursts during active intervals. PIM arises from an interaction between the upstream signal and a nonlinear component in the subscriber network and occurs in bursts corresponding to the upstream signal. The detection steps are: (a) identifying the potentially affected downstream signal from the upstream signal; (b) receiving the downstream signal during an active interval; (c) measuring a metric of the downstream signal to obtain an active value; (d) receiving the downstream signal during a quiet interval; (e) measuring the metric of the downstream signal to obtain a quiet value; (f) comparing active and quiet values; and (g) determining whether PIM distortion has been detected based on the comparison.

公开(公告)号：US20160205567A1

公开(公告)日：2016-07-14

申请号：US14593920

申请日：2015-01-09

Applicant: QUALCOMM Incorporated

Inventor： Venkatesan NALLAMPATTI EKAMBARAM ,  Jubin JOSE ,  Xinzhou WU ,  Thomas Joseph RICHARDSON

IPC: H04W24/08 ,  H04B1/10 ,  H04B17/336

CPC classification number: H04B1/1036 ,  H04L1/1692 ,  H04L1/248 ,  H04W56/0055

Abstract: Apparatus and method are provided for estimating the shortest time of arrival or the shortest round-trip time (RTT) of radio signals between communication devices in a wireless network. Filtering is performed by adaptive filters with suppressed side lobes adjustable in the time domain and widths of main lobes adjustable in the frequency domain to improve detection of signals on the shortest path of arrival or line-of-sight (LOS) path while mitigating the effects signals received from longer paths of arrival or non-line-of-sight (NLOS) paths.

Abstract translation: 提供了用于估计无线网络中的通信设备之间的最短到达时间或无线电信号的最短往返时间（RTT）的设备和方法。 滤波由自适应滤波器执行，其抑制旁瓣在时域中可调节，并且主波瓣的宽度可在频域中调节，以改善对最短路径或视线（LOS）路径上的信号的检测，同时减轻效应 从更长的到达途径或非视线（NLOS）路径接收的信号。

公开(公告)号：US20160149675A1

公开(公告)日：2016-05-26

申请号：US14949036

申请日：2015-11-23

Applicant: Intel Corporation

Inventor： Adee O. Ran ,  Kent C. Lusted

IPC: H04L1/24

CPC classification number: H04L1/248 ,  H04L1/203 ,  H04L1/244

Abstract: One embodiment provides an apparatus. The example apparatus includes a root mean square (RMS) distortion determination module configured to determine an RMS distortion error and a signal to noise and distortion ratio (SNDR), the RMS distortion error determined based, at least in part, on a portion of a transmitted pulse centered at or near a transmitted pulse maximum amplitude and the SNDR determined based, at least in part, on the RMS distortion error.

公开(公告)号：US09350573B2

公开(公告)日：2016-05-24

申请号：US12977734

申请日：2010-12-23

Applicant: Markus Nentwig ,  Risto Wichman

Inventor： Markus Nentwig ,  Risto Wichman

IPC: G06F19/00 ,  H04L25/03 ,  H04L1/24

CPC classification number: H04L25/0384 ,  H04L1/248 ,  H04L25/03853

Abstract: An apparatus, method and system for reducing discontinuities between waveforms in a communication system. In one embodiment, an apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured, with the processor, to determine an amplitude and set of derivatives at an end point of a first symbol waveform, and determine an amplitude and set of derivatives at a beginning point of a second symbol waveform. The memory and the computer program code are configured, with the processor, to insert a guard period waveform having an amplitude and set of derivatives at a first end to substantially match the amplitude and set of derivatives at the end point of the first symbol waveform and an amplitude and set of derivatives at a second end that substantially matches the amplitude and set of derivatives at the beginning point of the second symbol waveform.

Abstract translation: 一种用于减少通信系统中的波形之间的不连续性的装置，方法和系统。 在一个实施例中，一种装置包括包括计算机程序代码的处理器和存储器。 存储器和计算机程序代码与处理器配置以确定在第一符号波形的终点处的导数的幅度和集合，并且确定在第二符号波形的起点处的导数的幅度和集合。 存储器和计算机程序代码被配置为具有处理器，以在第一端插入具有幅度和导数集合的保护周期波形以基本上匹配在第一符号波形的终点处的导数的幅度和集合，以及 在第二端处的导数的幅度和集合基本上与第二符号波形的起点处的导数的幅度和集合匹配。

公开(公告)号：US20150131457A1

公开(公告)日：2015-05-14

申请号：US14532013

申请日：2014-11-04

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Neric Fong ,  Bing Xu ,  Wei-Cheng Liu ,  Terry W Chen

IPC: H04L1/24 ,  H04L25/49

CPC classification number: H04L1/243 ,  H04B3/46 ,  H04L1/248 ,  H04L25/49

Abstract: A gain asymmetry characterizing circuit for determining characteristics of gain asymmetry possessed by a transmitter includes a baseband loopback path, a test signal generating unit and a gain asymmetry measuring unit. The baseband loopback path is coupled to a baseband node on a first transmission path of the transmitter. The test signal generating unit is arranged to generate a first differential baseband test signal pair to the first transmission path. The first differential baseband test signal pair includes a first baseband signal and a second baseband signal. During a first period, the first baseband signal and the second baseband signal are fed into a positive input node and a negative input node of the first transmission path, respectively. During a second period, the second baseband signal and the first baseband signal are fed into the positive input node and the negative input node of the first transmission path, respectively.

Abstract translation: 用于确定发射机所具有的增益不对称性的增益不对称特性电路包括基带​​环回路径，测试信号生成单元和增益不对称测量单元。 基带环回路径耦合到发射机的第一传输路径上的基带节点。 测试信号生成单元被配置为产生到第一传输路径的第一差分基带测试信号对。 第一差分基带测试信号对包括第一基带信号和第二基带信号。 在第一时段期间，第一基带信号和第二基带信号分别馈送到第一传输路径的正输入节点和负输入节点。 在第二时段期间，第二基带信号和第一基带信号分别馈送到第一传输路径的正输入节点和负输入节点。

公开(公告)号：US20150030059A1

公开(公告)日：2015-01-29

申请号：US14341576

申请日：2014-07-25

Applicant: IKANOS COMMUNICATIONS, INC.

Inventor： Raghunath KALAVAI

IPC: H04L1/24 ,  H04M11/06

CPC classification number: H04L1/248 ,  H04M3/306 ,  H04M11/062

Abstract: According to certain aspects, embodiments of the invention relate to methods and apparatuses to detect loss of connectivity due to improper connection near the CPE modem (i.e. small loop condition) based on the analysis of SELT. In embodiments, this condition is detected based on separately analyzing the location and levels of time domain signals associated with different transmission bands in an xDSL bandplan.

Abstract translation: 根据某些方面，本发明的实施例涉及用于基于SELT的分析来检测由于CPE调制解调器附近的不正确连接造成的连接损失（即，小环路状况）的方法和装置。 在实施例中，基于在xDSL频带规划中分别分析与不同传输频带相关联的时域信号的位置和电平来检测该状况。

公开(公告)号：US20140286382A1

公开(公告)日：2014-09-25

申请号：US14220284

申请日：2014-03-20

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Stephen L. Dark

IPC: H04B17/00

CPC classification number: H04L25/08 ,  H04B17/104 ,  H04B17/11 ,  H04B17/21 ,  H04B17/309 ,  H04B17/373 ,  H04B17/391 ,  H04L1/248

Abstract: Systems and methods for measuring transmitter and/or receiver I/Q impairments are disclosed, including iterative methods for measuring transmitter I/Q impairments using shared local oscillators, iterative methods for measuring transmitter I/Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I/Q impairments. Also disclosed are methods for computing I/Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I/Q impairments through a linear system.

Abstract translation: 公开了用于测量发射机和/或接收机I / Q损伤的系统和方法，包括使用共享本地振荡器测量发射机I / Q损伤的迭代方法，使用有意偏移的本地振荡器测量发射机I / Q损伤的迭代方法，以及方法 用于测量接收机I / Q损伤。 还公开了用于从采样的复信号计算I / Q损伤的方法，用于计算发射机和接收机之间的信号路径的DC特性的方法，以及通过线性系统变换I / Q损伤的方法。

公开(公告)号：US20140204989A1

公开(公告)日：2014-07-24

申请号：US14220364

申请日：2014-03-20

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Stephen L. Dark ,  Christopher J. Behnke

IPC: H04B17/00

CPC classification number: H04B17/11 ,  H04B15/00 ,  H04B17/21 ,  H04B17/309 ,  H04B17/391 ,  H04L1/248 ,  H04L25/08

Abstract: Systems and methods for measuring transmitter and/or receiver I/Q impairments are disclosed, including iterative methods for measuring transmitter I/Q impairments using shared local oscillators, iterative methods for measuring transmitter I/Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I/Q impairments. Also disclosed are methods for computing I/Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I/Q impairments through a linear system.

Abstract translation: 公开了用于测量发射机和/或接收机I / Q损伤的系统和方法，包括使用共享本地振荡器测量发射机I / Q损伤的迭代方法，使用有意偏移的本地振荡器测量发射机I / Q损伤的迭代方法，以及方法 用于测量接收机I / Q损伤。 还公开了用于从采样的复信号计算I / Q损伤的方法，用于计算发射机和接收机之间的信号路径的DC特性的方法，以及通过线性系统变换I / Q损伤的方法。

公开(公告)号：US20140169429A1

公开(公告)日：2014-06-19

申请号：US13713309

申请日：2012-12-13

Applicant: Adee O. Ran

Inventor： Adee O. Ran

IPC: H04L1/24

CPC classification number: H04B17/104 ,  G01R29/027 ,  G01R31/31709 ,  H04L1/205 ,  H04L1/24 ,  H04L1/248 ,  H04L27/04

Abstract: Methods and test equipment for measuring jitter in a Pulse Amplitude Modulated (PAM) transmitter. Under one procedure, a first two-level PAM signal test pattern is used to measure clock-related jitter separated into random and deterministic components, while a second two-level PAM signal test pattern is used to measure oven-odd jitter (EOJ). Under another procedure, A four-level PAM signal test pattern is used to measure jitter-induced noise using distortion analysis. Test equipment are also disclosed for implementing various aspects of the test methods.

Abstract translation: 用于测量脉冲幅度调制（PAM）发射机抖动的方法和测试设备。 在一个程序下，使用第一个两级PAM信号测试模式来测量分为随机和确定性分量的时钟相关抖动，而使用第二个两级PAM信号测试模式来测量烤箱奇数抖动（EOJ）。 在另一个程序中，使用四电平PAM信号测试模式来测量使用失真分析的抖动引起的噪声。 还公开了用于实施测试方法的各个方面的测试设备。