公开(公告)号：US20140269462A1

公开(公告)日：2014-09-18

申请号：US13797608

申请日：2013-03-12

Applicant: QUALCOMM INCORPORATED

Inventor： Zhanfeng Jia ,  David Su ,  Ning Zhang ,  Kai Shi

IPC: H04W52/02

CPC classification number: H04W52/0229 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162

Abstract: A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.

Abstract translation: 唤醒无线电被配置为在无线电接收机处于睡眠模式时扫描传输。 唤醒无线电通过分析进入RF传输中的数据帧特性来检测用于无线电接收机的进入RF传输。 数据帧特征可以包含无线电接收机唯一的签名代码。 签名代码可以基于在清除发送到自身（CTS2S）传输中接收的正交频分复用（OFDM）符号的序列的持续时间或用于发送数据的短帧间间隔（SIFS）的持续时间 框架。

公开(公告)号：US09160461B2

公开(公告)日：2015-10-13

申请号：US13738917

申请日：2013-01-10

Applicant: QUALCOMM Incorporated

Inventor： Justin A. Hwang ,  David Su

IPC: H04B1/40 ,  H04B15/00 ,  H04B1/04 ,  H04B15/06

CPC classification number: H04B15/00 ,  H04B1/0475 ,  H04B15/06

Abstract: A frequency source, such as for a wireless communications device, configured to have a duty cycle adjustment. A selected harmonic spur resulting from operation of the frequency source at one duty cycle may be avoided or minimized by operating the frequency source at a second duty cycle. Determination of the appropriate duty cycle may be based on measuring the amplitude of the harmonic spur as it appears in the output of a receive chain of the wireless device. Alternatively, the duty cycle may be set to desired value to avoid or minimize a given harmonic.

Abstract translation: 诸如用于无线通信设备的频率源被配置为具有占空比调整。 可以通过在第二占空比下操作频率源来避免或最小化在一个占空比下由频率源的操作产生的选择的谐波杂散。 确定适当的占空比可以基于测量在无线设备的接收链的输出中出现的谐波杂散的振幅。 或者，可以将占空比设置为期望值以避免或最小化给定的谐波。

公开(公告)号：US08767893B2

公开(公告)日：2014-07-01

申请号：US13736825

申请日：2013-01-08

Applicant: QUALCOMM Incorporated

Inventor： Teresa H. Meng ,  David Su ,  Masoud Zargari

IPC: H03D3/00

CPC classification number: H04L27/148 ,  H03J7/04 ,  H04B1/38 ,  H04L7/033 ,  H04L27/0014 ,  H04L2027/0022

Abstract: The present invention aims at eliminating the effects of frequency offsets between two transceivers by adjusting frequencies used during transmission. In this invention, methods for correcting the carrier frequency and the sampling frequency during transmission are provided, including both digital and analog implementations of such methods. The receiver determines the relative frequency offset between the transmitter and the receiver, and uses this information to correct this offset when the receiver transmits its data to the original transmitter in the return path, so that the signal received by the original transmitter is in sampling and carrier frequency lock with the original transmitter's local frequency reference.

Abstract translation: 本发明旨在通过调整在传输期间使用的频率来消除两个收发机之间频率偏移的影响。 在本发明中，提供了在传输期间校正载波频率和采样频率的方法，包括这些方法的数字和模拟实现。 接收机确定发射机和接收机之间的相对频率偏移，并且当接收机在返回路径中将其数据发送到原始发射机时，使用该信息来校正该偏移，使得由原始发射机接收的信号在采样中， 载波频率锁定与原始发射机的本地频率参考。

公开(公告)号：US09204394B2

公开(公告)日：2015-12-01

申请号：US13797608

申请日：2013-03-12

Applicant: QUALCOMM Incorporated

Inventor： Zhanfeng Jia ,  David Su ,  Ning Zhang ,  Kai Shi

IPC: H04W52/02

CPC classification number: H04W52/0229 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162

Abstract: A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.

Abstract translation: 唤醒无线电被配置为在无线电接收机处于睡眠模式时扫描传输。 唤醒无线电通过分析进入RF传输中的数据帧特性来检测用于无线电接收机的进入RF传输。 数据帧特征可以包含无线电接收机唯一的签名代码。 签名代码可以基于在清除发送到自身（CTS2S）传输中接收的正交频分复用（OFDM）符号的序列的持续时间或用于发送数据的短帧间间隔（SIFS）的持续时间 框架。