BRPI0507148A - filtragem no tempo para mitigação de retardo em excesso em sistemas ofdm - Google Patents

filtragem no tempo para mitigação de retardo em excesso em sistemas ofdm

Info

Publication number
BRPI0507148A
BRPI0507148A BRPI0507148-8A BRPI0507148A BRPI0507148A BR PI0507148 A BRPI0507148 A BR PI0507148A BR PI0507148 A BRPI0507148 A BR PI0507148A BR PI0507148 A BRPI0507148 A BR PI0507148A
Authority
BR
Brazil
Prior art keywords
time filtering
excess delay
ofdm systems
channel estimation
excess
Prior art date
Application number
BRPI0507148-8A
Other languages
English (en)
Inventor
Dhananjay Ashok Gore
Ashok Mantravadi
Fuyun Ling
Kiran Mukkavilli
Raghuraman Krishnamoorthi
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of BRPI0507148A publication Critical patent/BRPI0507148A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

FILTRAGEM NO TEMPO PARA MITIGAçãO DE RETARDO EM EXCESSO EM SISTEMAS OFDM Técnicas de transmissão piloto e estimativa de canal para um sistema OFDM com espalhamento de retardo em excesso são descritas. Para mitigar os efeitos prejudicais do espalhamento de retardo em excesso, filtragem no tempo é utilizada. Filtragem no tempo é utilizada para combater os efeitos do espalhamento de retardo em excesso na estimativa de canal. A filtragem no tempo é realizada na presença de pilotos escalonados e ajuda no aperfeiçoamento da estimativa de canal na presença de espalhamento de retardo em excesso.
BRPI0507148-8A 2004-01-28 2005-01-20 filtragem no tempo para mitigação de retardo em excesso em sistemas ofdm BRPI0507148A (pt)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US54008704P 2004-01-28 2004-01-28
US11/022,513 US8553822B2 (en) 2004-01-28 2004-12-22 Time filtering for excess delay mitigation in OFDM systems
PCT/US2005/001588 WO2005074217A1 (en) 2004-01-28 2005-01-20 Time filtering for excess delay mitigation in ofdm systems

Publications (1)

Publication Number Publication Date
BRPI0507148A true BRPI0507148A (pt) 2007-06-19

Family

ID=34798040

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0507148-8A BRPI0507148A (pt) 2004-01-28 2005-01-20 filtragem no tempo para mitigação de retardo em excesso em sistemas ofdm

Country Status (11)

Country Link
US (1) US8553822B2 (pt)
EP (1) EP1714450A1 (pt)
JP (1) JP2007520162A (pt)
KR (1) KR100835147B1 (pt)
CN (1) CN1939017B (pt)
AU (1) AU2005208658B2 (pt)
BR (1) BRPI0507148A (pt)
CA (1) CA2554602A1 (pt)
IL (1) IL177091A (pt)
RU (1) RU2359419C2 (pt)
WO (1) WO2005074217A1 (pt)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7339999B2 (en) * 2004-01-21 2008-03-04 Qualcomm Incorporated Pilot transmission and channel estimation for an OFDM system with excess delay spread
WO2005074166A1 (en) 2004-01-29 2005-08-11 Neocific, Inc. Methods and apparatus for overlaying multi-carrier and direct sequence spread spectrum signals in a broadband wireless communication system
GB2412551A (en) * 2004-03-26 2005-09-28 Sony Uk Ltd Receiver
US7457231B2 (en) * 2004-05-04 2008-11-25 Qualcomm Incorporated Staggered pilot transmission for channel estimation and time tracking
US8089855B2 (en) * 2004-06-04 2012-01-03 Qualcomm Incorporated Transmission of overhead information for broadcast and multicast services in a wireless communication system
US7885350B1 (en) * 2004-10-28 2011-02-08 Donald Brian Eidson System and method for non-interfering signaling and reception of overlapping single carrier transmissions over delay spread channels
US20060221810A1 (en) * 2005-03-10 2006-10-05 Bojan Vrcelj Fine timing acquisition
US8165167B2 (en) * 2005-03-10 2012-04-24 Qualcomm Incorporated Time tracking for a communication system
US8675631B2 (en) * 2005-03-10 2014-03-18 Qualcomm Incorporated Method and system for achieving faster device operation by logical separation of control information
US20100157833A1 (en) * 2005-03-10 2010-06-24 Qualcomm Incorporated Methods and systems for improved timing acquisition for varying channel conditions
US7742444B2 (en) 2005-03-15 2010-06-22 Qualcomm Incorporated Multiple other sector information combining for power control in a wireless communication system
WO2006098011A1 (ja) * 2005-03-16 2006-09-21 Fujitsu Limited 多入力システムにおける無線通信装置及びチャンネル推定及び分離方法
US7848463B2 (en) * 2005-04-07 2010-12-07 Qualcomm Incorporated Adaptive time-filtering for channel estimation in OFDM system
US9055552B2 (en) 2005-06-16 2015-06-09 Qualcomm Incorporated Quick paging channel with reduced probability of missed page
US8750908B2 (en) 2005-06-16 2014-06-10 Qualcomm Incorporated Quick paging channel with reduced probability of missed page
US20070002726A1 (en) * 2005-07-01 2007-01-04 Zangi Kambiz C System and method for adapting a cyclic prefix in an orthogonal frequency division multiplexing (OFDM) system
US9354297B2 (en) 2005-09-27 2016-05-31 Qualcomm Incorporated Position location using phase-adjusted transmitters
US20070072621A1 (en) * 2005-09-27 2007-03-29 Mukkavilli Krishna K Position location using transmitters with timing offset
US8981996B2 (en) * 2005-09-27 2015-03-17 Qualcomm Incorporated Position location using transmitters with timing offset and phase adjustment
JP2007104574A (ja) * 2005-10-07 2007-04-19 Sharp Corp マルチキャリア無線受信機及び受信方法
US20070147226A1 (en) * 2005-10-27 2007-06-28 Aamod Khandekar Method and apparatus for achieving flexible bandwidth using variable guard bands
US20090305664A1 (en) 2005-10-27 2009-12-10 Qualcomm Incorporated method and apparatus for attempting access in wireless communication systems
US20090207790A1 (en) * 2005-10-27 2009-08-20 Qualcomm Incorporated Method and apparatus for settingtuneawaystatus in an open state in wireless communication system
US7623607B2 (en) * 2005-10-31 2009-11-24 Qualcomm Incorporated Methods and apparatus for determining timing in a wireless communication system
US8948329B2 (en) * 2005-12-15 2015-02-03 Qualcomm Incorporated Apparatus and methods for timing recovery in a wireless transceiver
US20070165730A1 (en) * 2006-01-17 2007-07-19 Motorola, Inc. Transmitter cellular communication system and method of transmitting therefor
US8259854B2 (en) * 2006-04-13 2012-09-04 St-Ericsson Sa Channel estimation using common and dedicated pilots
US8116388B2 (en) * 2006-06-16 2012-02-14 Broadcom Corporation Time domain interference averaging with multiuser diversity in OFDMA systems
US7830994B2 (en) * 2006-10-18 2010-11-09 Analog Devices, Inc. Channel estimation system and method
DE102006056158B4 (de) * 2006-11-28 2011-11-17 Infineon Technologies Ag Kanalschätzung für OFDM Systeme
CN101299600B (zh) * 2007-04-30 2010-08-25 大唐移动通信设备有限公司 一种基于ofdm系统的数字滤波器的设计方法
CN101325568B (zh) * 2007-06-12 2012-02-22 华为技术有限公司 基于正交频分复用系统的信道估计方法及其装置
CN101843061B (zh) 2007-11-01 2012-12-19 Nxp股份有限公司 区分实际回波峰与混叠回波峰的方法
EP3514993A1 (en) * 2008-03-31 2019-07-24 Panasonic Intellectual Property Management Co., Ltd. Receiver, method of reception, reception program, integrated circuit, and digital television
US8089856B2 (en) * 2009-04-08 2012-01-03 Mitsubishi Electric Research Laboratories, Inc. Zero correlation zone based preamble for oversampled OFDM networks in URWIN
JP5347792B2 (ja) * 2009-07-16 2013-11-20 ソニー株式会社 信号処理装置、信号処理方法、及び、受信システム
US8325790B2 (en) * 2009-08-03 2012-12-04 Analog Devices, Inc. Equalization for OFDM communication
US8121023B2 (en) * 2009-09-21 2012-02-21 Intel Corporation Coaxial network communication node and methods for communicating multimedia over a coaxial network with reduced-length cyclic prefixes
US8737457B2 (en) * 2012-09-28 2014-05-27 Telefonaktiebolaget L M Ericsson (Publ) Adaptive smoothing of channel estimates
US8737550B1 (en) * 2012-12-04 2014-05-27 Telefonaktiebolaget L M Ericsson (Publ) Estimating optimal linear regression filter length for channel estimation
RU2696092C2 (ru) * 2017-11-14 2019-07-31 федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" Способ реконфигурируемой фильтрации для понижения пик-фактора OFDM-сигналов и устройство для его реализации
US11201693B2 (en) * 2020-04-28 2021-12-14 Maxlinear, Inc. Receiver filtering

Family Cites Families (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303263A (en) * 1991-06-25 1994-04-12 Oki Electric Industry Co., Ltd. Transmission channel characteristic equalizer
US5488635A (en) * 1993-10-29 1996-01-30 General Electric Company Low complexity adaptive equalizer radio receiver employing reduced complexity branch metric calculation
US5732113A (en) 1996-06-20 1998-03-24 Stanford University Timing and frequency synchronization of OFDM signals
US5867478A (en) 1997-06-20 1999-02-02 Motorola, Inc. Synchronous coherent orthogonal frequency division multiplexing system, method, software and device
US6507568B2 (en) 1997-08-27 2003-01-14 Lucent Technologies Inc. Enhanced access in wireless communication systems under rapidly fluctuating fading conditions
US6654428B1 (en) 1998-01-13 2003-11-25 Massachusetts Institute Of Technology Systems and methods for wireless communications
EP0938208A1 (en) * 1998-02-22 1999-08-25 Sony International (Europe) GmbH Multicarrier transmission, compatible with the existing GSM system
US6654429B1 (en) 1998-12-31 2003-11-25 At&T Corp. Pilot-aided channel estimation for OFDM in wireless systems
US6473418B1 (en) 1999-03-11 2002-10-29 Flarion Technologies, Inc. Orthogonal frequency division multiplexing based spread spectrum multiple access
JP4410388B2 (ja) 1999-06-22 2010-02-03 パナソニック株式会社 Ｏｆｄｍ復調装置およびｏｆｄｍ復調方法
US6954481B1 (en) 2000-04-18 2005-10-11 Flarion Technologies, Inc. Pilot use in orthogonal frequency division multiplexing based spread spectrum multiple access systems
JP3691357B2 (ja) 2000-06-19 2005-09-07 日本放送協会 直交周波数分割多重伝送方式におけるキャリアの配置方法、及び送信装置並びに受信装置
US6654728B1 (en) 2000-07-25 2003-11-25 Deus Technologies, Llc Fuzzy logic based classification (FLBC) method for automated identification of nodules in radiological images
DE60028200T2 (de) 2000-08-01 2007-03-15 Sony Deutschland Gmbh Vorrichtung und Verfahren zur Kanalschätzung für OFDM-System
CN1339506A (zh) 2000-08-23 2002-03-13 上海博德基因开发有限公司 一种新的多肽——人多聚腺苷酸结合蛋白20.13和编码这种多肽的多核苷酸
US7054375B2 (en) 2000-12-22 2006-05-30 Nokia Corporation Method and apparatus for error reduction in an orthogonal modulation system
FR2820574B1 (fr) 2001-02-08 2005-08-05 Wavecom Sa Procede d'extraction d'un motif de symboles de reference servant a estimer la fonction de transfert d'un canal de transmission, signal, dispositif et procedes correspondants
JP2003032217A (ja) 2001-07-11 2003-01-31 Matsushita Electric Ind Co Ltd Ｏｆｄｍ通信装置およびｏｆｄｍ信号の搬送波再生方法
JP2003101503A (ja) 2001-09-21 2003-04-04 Mega Chips Corp Ｏｆｄｍ用等化装置およびｏｆｄｍ用等化方法
US7031250B2 (en) 2001-09-27 2006-04-18 Rf Micro Devices, Inc. Method and apparatus for channel estimation
US7436881B2 (en) 2001-09-28 2008-10-14 Nec Corporation Per-bin DFE for advanced OQAM-based multi-carrier wireless data transmission systems
US6684173B2 (en) 2001-10-09 2004-01-27 Micron Technology, Inc. System and method of testing non-volatile memory cells
US20030081538A1 (en) 2001-10-18 2003-05-01 Walton Jay R. Multiple-access hybrid OFDM-CDMA system
US7324606B2 (en) 2001-10-31 2008-01-29 Henry Stephen Eilts Computationally efficient system and method for channel estimation
US7180965B2 (en) 2001-12-12 2007-02-20 Texas Instruments Incorporated Phase estimation and compensation in orthogonal frequency division multiplex (OFDM) systems
US7139331B2 (en) 2002-03-30 2006-11-21 Broadcom Corporation Characterizing channel response in a single upstream burst using redundant information from training tones
US7020226B1 (en) 2002-04-04 2006-03-28 Nortel Networks Limited I/Q distortion compensation for the reception of OFDM signals
JP4198428B2 (ja) 2002-04-05 2008-12-17 三菱電機株式会社 無線伝送装置
JP4043335B2 (ja) 2002-10-08 2008-02-06 株式会社日立国際電気 受信装置
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US6928062B2 (en) 2002-10-29 2005-08-09 Qualcomm, Incorporated Uplink pilot and signaling transmission in wireless communication systems
US7039001B2 (en) 2002-10-29 2006-05-02 Qualcomm, Incorporated Channel estimation for OFDM communication systems
KR100507519B1 (ko) 2002-12-13 2005-08-17 한국전자통신연구원 Ｏｆｄｍａ 기반 셀룰러 시스템의 하향링크를 위한 신호구성 방법 및 장치
US7095790B2 (en) 2003-02-25 2006-08-22 Qualcomm, Incorporated Transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation
JP3654646B2 (ja) 2003-05-12 2005-06-02 三菱電機株式会社 復調装置及び復調方法
CN1200521C (zh) * 2003-06-18 2005-05-04 清华大学 用于频域均衡的导频插入与信道参数估计的方法
US7200190B2 (en) * 2003-06-30 2007-04-03 Motorola, Inc. Unbiased signal to interference ratio in wireless communications devices and methods therefor
US20050063298A1 (en) 2003-09-02 2005-03-24 Qualcomm Incorporated Synchronization in a broadcast OFDM system using time division multiplexed pilots
US7221680B2 (en) 2003-09-02 2007-05-22 Qualcomm Incorporated Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US7742546B2 (en) 2003-10-08 2010-06-22 Qualcomm Incorporated Receiver spatial processing for eigenmode transmission in a MIMO system
US8526412B2 (en) 2003-10-24 2013-09-03 Qualcomm Incorporated Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system
US7660275B2 (en) 2003-10-24 2010-02-09 Qualcomm Incorporated Local and wide-area transmissions in a wireless broadcast network
US8391413B2 (en) 2003-12-19 2013-03-05 Qualcomm Incorporated Channel estimation for an OFDM communication system with inactive subbands
US7339999B2 (en) * 2004-01-21 2008-03-04 Qualcomm Incorporated Pilot transmission and channel estimation for an OFDM system with excess delay spread
US7457231B2 (en) 2004-05-04 2008-11-25 Qualcomm Incorporated Staggered pilot transmission for channel estimation and time tracking

Also Published As

Publication number Publication date
RU2359419C2 (ru) 2009-06-20
IL177091A0 (en) 2006-12-10
CN1939017A (zh) 2007-03-28
IL177091A (en) 2010-12-30
US8553822B2 (en) 2013-10-08
RU2006130801A (ru) 2008-03-20
WO2005074217A1 (en) 2005-08-11
AU2005208658B2 (en) 2009-02-05
CA2554602A1 (en) 2005-08-11
KR100835147B1 (ko) 2008-06-04
EP1714450A1 (en) 2006-10-25
JP2007520162A (ja) 2007-07-19
AU2005208658A1 (en) 2005-08-11
KR20060125867A (ko) 2006-12-06
CN1939017B (zh) 2010-09-01
US20050163258A1 (en) 2005-07-28

Similar Documents

Publication Publication Date Title
BRPI0507148A (pt) filtragem no tempo para mitigação de retardo em excesso em sistemas ofdm
BRPI0418430A (pt) estimativa de canal e transmissão piloto para um sistema ofdm com espalhamento de retardo excessivo
BR112017002918A2 (pt) sistema e método para gerar as formas de onda e a utilização das mesmas
EP3799390A4 (en) METHOD, SYSTEM AND DEVICE FOR USING PRE-EMPTIVE SCHEDULING RESOURCE SHARING
BR112015017731A2 (pt) método para recepção de dados, e, dispositivo de comunicações para gerar estimativas de canal
BR112018010417A8 (pt) canalização de bloco de recursos para numerologias baseadas em ofdm
BRPI0520299A2 (pt) método de gerenciamento de recursos de comunicação, método de transmissão de informação por um nó de transmissão e, sistema para gerenciamento de recursos de comunicação em um sistema de comunicação sem fio, nó de rede, e, nó de transmissor
BRPI0909648A8 (pt) Transmissor em sistemas de comunicação sem fio com estrutura hierárquica de pilotos
BR112014008378A2 (pt) sistema de comunicação
BR112021018382A2 (pt) Projeto de forma de onda de sinal de referência de sonorização para comunicações sem fio
BRPI0706641A8 (pt) dispositivo de transmissão e método de transmissão
NI201000055A (es) 2' - fluoro - 2' - desoxitetrahidrouridinas como inhibidores de citidina desaminasa.
BR112013002305A2 (pt) método, sistema e dispositivo para agregação de rede de rádio
BR112018000014A2 (pt) repetição de canal de difusão
BR0315773A (pt) Estimativa de canal para sistemas de comunicação ofdm
BR112015030339A8 (pt) método para tratamento de uma formação subterrânea
AR061246A1 (es) Anticuerpos anti- dill4 y metodos que los usan
ECSP055953A (es) Granisetron transdermico
BRPI0513696A (pt) filtragem no domìnio da freqüência para melhorar estimação de canal em sistemas multiportadoras
ATE494713T1 (de) Kanal-und interferenzschätzung mit definierten piloten in ofdma-systemen
BRPI0512822A (pt) método e equipamento para cancelamento de interferência de piloto em um sistema de comunicação sem fio
BR112018068423A2 (pt) dispositivo de comunicação sem fio e método de comunicação sem fio
BRPI0511811A (pt) transmissão de informações de overhead para serviços de broadcast e multicast em um sistema de comunicação sem fio
BRPI0509207A (pt) moduladores canabinóides de tetraidro-indazol
BR112014005354A8 (pt) Método implementado por um dispositivo de computação

Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 8A ANUIDADE, CONFORME ART. 10 DA RES. 124/06.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 2204 DE 02/04/2013.