公开(公告)号：EP3818753A1

公开(公告)日：2021-05-12

申请号：EP19745440.8

申请日：2019-07-03

Applicant: QUALCOMM INCORPORATED

Inventor： NADAKUDUTI, Jagadish ,  LU, Lin ,  GUCKIAN, Paul ,  CAI, Mingming ,  HAN, Junsheng ,  FERNANDO, Udara ,  CHALLA, Raghu

IPC: H04W52/36 ,  H04W52/38

公开(公告)号：EP3566531A1

公开(公告)日：2019-11-13

申请号：EP18709416.4

申请日：2018-01-04

Applicant: Qualcomm Incorporated

Inventor： ISLAM, Muhammad, Nazmul ,  LI, Junyi ,  CHALLA, Raghu

IPC: H04W74/00

公开(公告)号：EP3520487A1

公开(公告)日：2019-08-07

申请号：EP17784131.9

申请日：2017-09-28

Applicant: Qualcomm Incorporated

Inventor： ANG, Peter Pui Lok ,  MUKKAVILLI, Krishna Kiran ,  CHALLA, Raghu ,  YANG, Yang ,  GOROKHOV, Alexei Yurievitch ,  JI, Tingfang ,  SORIAGA, Joseph Binamira ,  LEE, Heechoon

IPC: H04W48/08 ,  H04L5/00

公开(公告)号：EP3183918B1

公开(公告)日：2018-12-26

申请号：EP15747296.0

申请日：2015-07-15

Applicant: Qualcomm Incorporated

Inventor： XU, Huilin ,  GOROKHOV, Alexei ,  MOTAMED, Mariam ,  CHALLA, Raghu ,  MACDONALD, Joshua ,  XIE, Kai ,  PADI, Vivek ,  MARTEEN, Alex ,  MA, Juchuan

IPC: H04L27/26 ,  H04W56/00 ,  H04L27/00 ,  H04W76/28

CPC classification number: H04W28/0289 ,  H04L27/00 ,  H04L27/2657 ,  H04L27/2695 ,  H04L2027/0034 ,  H04L2027/0065 ,  H04W56/0035 ,  H04W76/28

Abstract: Aspects of frequency error detection with Physical Broadcast CHannel (PBCH) frequency hypothesis are described. For example, a method and apparatus are disclosed for frequency tracking in a user equipment (UE) may include detecting a change in frequency that exceeds a pull-in range of a frequency tracking loop (FTL) of the UE. The method and apparatus may also include identifying a tracking recovery frequency in response to the change in frequency being detected, wherein the tracking recover frequency is identified from a set of frequency hypotheses and based on decoding of the PBCH received by the UE. The method and apparatus may further include updating the FTL with the tracking recovery frequency.

公开(公告)号：EP1250763B1

公开(公告)日：2013-05-22

申请号：EP01908718.8

申请日：2001-01-26

Applicant: QUALCOMM INCORPORATED

Inventor： AGRAWAL, Avneesh ,  SIH, Gilbert ,  ROH, Mark ,  BUTLER, Brian ,  CHALLA, Raghu

IPC: H04L27/00 ,  H04B1/7115 ,  H04B1/7087

CPC classification number: H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L27/0014 ,  H04L2027/0032 ,  H04L2027/0057 ,  H04L2027/0087

公开(公告)号：EP1407588B1

公开(公告)日：2012-08-15

申请号：EP02752423.0

申请日：2002-07-16

Applicant: QUALCOMM INCORPORATED

Inventor： CHALLA, Raghu ,  SIH, Gilbert, Christopher

IPC: H04B1/711 ,  H04L27/00

CPC classification number: H04L27/0014 ,  H04L2027/0055 ,  H04L2027/0079 ,  H04L2027/0087

Abstract: Techniques to acquire and track pilots in a CDMA system. In an aspect, frequency acquisition of a number of signal instances (i.e., multipaths) in a received signal may be achieved concurrently based on a frequency control loop (RAFC) maintained for each finger processor of a rake receiver. Upon successful acquisition, frequency tracking of acquired multipaths may be achieved based on a combination of a frequency control loop (VAFC) maintained for an oscillator used for downconverting the received signal and the RAFCs for the finger processors. In a tracking mode, the VAFC tracks the average frequency of the acquired multipaths by adjusting the frequency of the oscillator. The RAFC of each finger processor tracks the residual frequency error (e.g., due to Doppler frequency shift) of the individual acquired multipath by adjusting the frequency of a complex sinusoidal signal used in a rotator within the finger processor.