AR046751A1 - Esquemas de transmision de piloto para un sistema de multiples antenas - Google Patents

Esquemas de transmision de piloto para un sistema de multiples antenas

Info

Publication number
AR046751A1
AR046751A1 ARP040104528A ARP040104528A AR046751A1 AR 046751 A1 AR046751 A1 AR 046751A1 AR P040104528 A ARP040104528 A AR P040104528A AR P040104528 A ARP040104528 A AR P040104528A AR 046751 A1 AR046751 A1 AR 046751A1
Authority
AR
Argentina
Prior art keywords
pilot
transmitted
mimo
scale
additional
Prior art date
Application number
ARP040104528A
Other languages
English (en)
Inventor
Dhananjay A Gore
Avneesh Agrawal
Tamer Kadous
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 AR046751A1 publication Critical patent/AR046751A1/es

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/76—Pilot transmitters or receivers for control of transmission or for equalising
    • 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
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0684—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different training sequences per antenna
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26132—Structure of the reference signals using repetition
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Se describen esquemas de transmisión de piloto eficaces para sistemas de comunicación de múltiples antenas. En general, los receptores MISO prefieren un piloto transmitido en una dirección espacial, y típicamente los receptores MIMO requieren un piloto transmitido en direcciones espaciales diferentes. En un esquema de transmisión de piloto, se genera un primer conjunto de T símbolos de piloto en escala con un primer vector de instrucción y transmitido (por ejemplo, continuamente) desde T antenas de transmisión, donde T > 1. Si el (los) receptor(es) MIMO deberán ser soportados por el sistema, entonces son generados al menos T-1 conjuntos adicionales de T símbolos de piloto en escala con al menos T-1 vectores de instrucción adicionales y transmitidos desde las T antenas de transmisión. Los vectores de instrucción son para direcciones espaciales diferentes (por ejemplo, ortogonal). Cada receptor MIMO puede estimar su canal MIMO en base al primer conjunto de símbolos de piloto en escala. Cada receptor MIMO puede estimar su canal de MIMO en base al primero y los conjuntos adicionales de símbolo de piloto en escala.
ARP040104528A 2003-12-05 2004-12-03 Esquemas de transmision de piloto para un sistema de multiples antenas AR046751A1 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52720103P 2003-12-05 2003-12-05
US10/890,718 US7145940B2 (en) 2003-12-05 2004-07-13 Pilot transmission schemes for a multi-antenna system

Publications (1)

Publication Number Publication Date
AR046751A1 true AR046751A1 (es) 2005-12-21

Family

ID=34681525

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP040104528A AR046751A1 (es) 2003-12-05 2004-12-03 Esquemas de transmision de piloto para un sistema de multiples antenas

Country Status (15)

Country Link
US (1) US7145940B2 (es)
EP (5) EP1700437B1 (es)
JP (6) JP2007513584A (es)
KR (1) KR100820998B1 (es)
AR (1) AR046751A1 (es)
AU (1) AU2004297958C1 (es)
BR (1) BRPI0417242A (es)
CA (2) CA2547493C (es)
IL (1) IL176047A0 (es)
MX (1) MXPA06006385A (es)
NO (1) NO20063099L (es)
NZ (1) NZ547572A (es)
RU (1) RU2333610C2 (es)
TW (2) TWI385948B (es)
WO (1) WO2005057870A1 (es)

Families Citing this family (146)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7295509B2 (en) 2000-09-13 2007-11-13 Qualcomm, Incorporated Signaling method in an OFDM multiple access system
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US7248559B2 (en) * 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US7042857B2 (en) 2002-10-29 2006-05-09 Qualcom, Incorporated Uplink pilot and signaling transmission in wireless communication systems
US7145940B2 (en) * 2003-12-05 2006-12-05 Qualcomm Incorporated Pilot transmission schemes for a multi-antenna system
JP3910956B2 (ja) * 2003-12-26 2007-04-25 株式会社東芝 Ｏｆｄｍ無線通信システムのための伝搬路推定器及びこれを用いた受信装置
US7450489B2 (en) * 2003-12-30 2008-11-11 Intel Corporation Multiple-antenna communication systems and methods for communicating in wireless local area networks that include single-antenna communication devices
JP3906209B2 (ja) * 2004-01-26 2007-04-18 株式会社東芝 無線受信装置及び無線受信方法
US8611283B2 (en) * 2004-01-28 2013-12-17 Qualcomm Incorporated Method and apparatus of using a single channel to provide acknowledgement and assignment messages
KR100818774B1 (ko) 2004-01-29 2008-04-03 포스데이타 주식회사 광대역 무선 통신 시스템에서 다중-반송파 및 직접 시퀀스확산 스펙트럼 신호를 중첩시키는 방법 및 장치
WO2005081439A1 (en) 2004-02-13 2005-09-01 Neocific, Inc. Methods and apparatus for multi-carrier communication systems with adaptive transmission and feedback
WO2005076554A1 (en) * 2004-02-05 2005-08-18 Zakrytoe Aktsionernoe Obschestvo Intel Method and apparatus to reduce crosstalk in a mimo communication system
US20050180312A1 (en) * 2004-02-18 2005-08-18 Walton J. R. Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US7742533B2 (en) * 2004-03-12 2010-06-22 Kabushiki Kaisha Toshiba OFDM signal transmission method and apparatus
CN106160830B (zh) * 2004-03-15 2020-02-14 苹果公司 用于具有四根发射天线的ofdm系统的导频设计
US7616711B2 (en) * 2004-07-20 2009-11-10 Qualcomm Incorporated Frequency domain filtering to improve channel estimation in multicarrier systems
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US8891349B2 (en) 2004-07-23 2014-11-18 Qualcomm Incorporated Method of optimizing portions of a frame
KR100905350B1 (ko) * 2004-07-29 2009-07-01 콸콤 인코포레이티드 인터리빙을 위한 시스템 및 방법
US20080317142A1 (en) * 2005-07-29 2008-12-25 Qualcomm Incorporated System and method for frequency diversity
US9246728B2 (en) 2004-07-29 2016-01-26 Qualcomm Incorporated System and method for frequency diversity
US8391410B2 (en) * 2004-07-29 2013-03-05 Qualcomm Incorporated Methods and apparatus for configuring a pilot symbol in a wireless communication system
US8270512B2 (en) * 2004-08-12 2012-09-18 Interdigital Technology Corporation Method and apparatus for subcarrier and antenna selection in MIMO-OFDM system
CN1756248B (zh) * 2004-09-29 2010-06-02 上海贝尔阿尔卡特股份有限公司 多入多出正交频分复用移动通信系统及信道估计方法
US9002299B2 (en) * 2004-10-01 2015-04-07 Cisco Technology, Inc. Multiple antenna processing on transmit for wireless local area networks
US8831115B2 (en) * 2004-12-22 2014-09-09 Qualcomm Incorporated MC-CDMA multiplexing in an orthogonal uplink
CN1805305A (zh) * 2005-01-13 2006-07-19 松下电器产业株式会社 采用天线选择执行自适应空时发送分集的方法和设备
US8135088B2 (en) 2005-03-07 2012-03-13 Q1UALCOMM Incorporated Pilot transmission and channel estimation for a communication system utilizing frequency division multiplexing
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US7953039B2 (en) 2005-04-21 2011-05-31 Samsung Elecronics Co., Ltd. System and method for channel estimation in a delay diversity wireless communication system
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8462859B2 (en) * 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US20070071147A1 (en) * 2005-06-16 2007-03-29 Hemanth Sampath Pseudo eigen-beamforming with dynamic beam selection
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
EP1739907B1 (en) * 2005-06-29 2015-01-07 Apple Inc. Digital communication method, transmitter and receiver, wherein the amount of pilot symbols is selected based on the demodulator type at the receiver side
US9042212B2 (en) 2005-07-29 2015-05-26 Qualcomm Incorporated Method and apparatus for communicating network identifiers in a communication system
US9391751B2 (en) * 2005-07-29 2016-07-12 Qualcomm Incorporated System and method for frequency diversity
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US20070041457A1 (en) 2005-08-22 2007-02-22 Tamer Kadous Method and apparatus for providing antenna diversity in a wireless communication system
US8077654B2 (en) * 2005-08-22 2011-12-13 Qualcomm Incorporated Auxiliary FL MIMO pilot transmission in 1XEV-DO
US8331465B2 (en) 2005-08-23 2012-12-11 Apple Inc. Adaptive two-dimensional channel interpolation
EP3457615B1 (en) 2005-08-23 2021-09-22 Apple Inc. Methods and systems for ofdm multiple zone partitioning
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
EP2194659A1 (en) * 2005-09-02 2010-06-09 Mitsubishi Electric R&D Centre Europe B.V. Method for controlling the transfer of signals from a first communication device to a second communication device through a wireless network
US8139672B2 (en) * 2005-09-23 2012-03-20 Qualcomm Incorporated Method and apparatus for pilot communication in a multi-antenna wireless communication system
EP1929735B1 (en) 2005-09-27 2019-01-16 Nokia Technologies Oy Pilot structure for multicarrier transmissions
WO2007040515A2 (en) * 2005-09-30 2007-04-12 Mitsubishi Electric Research Laboratories Training signals for selecting antennas and beams in mimo wireless lans
EP1929819B1 (en) 2005-09-30 2019-08-07 Apple Inc. Initial access channel for scalable wireless mobile communication networks
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US7813448B2 (en) * 2005-10-31 2010-10-12 Broadcom Corporation Cyclic delay diversity in a wireless system
PL1943846T3 (pl) 2005-11-01 2010-08-31 Ericsson Telefon Ab L M Sposób i układy w systemie radiokomunikacji
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
TWI427985B (zh) 2005-12-06 2014-02-21 Lg Electronics Inc 使用複數載波來傳輸資料之設備及方法
US7773961B2 (en) * 2005-12-09 2010-08-10 Samsung Electronics Co., Ltd. Apparatus and method for channel estimation without signaling overhead
KR100880171B1 (ko) * 2005-12-29 2009-01-23 삼성전자주식회사 무선 통신 시스템에서 단말의 디코딩 장치 및 방법
US8130857B2 (en) * 2006-01-20 2012-03-06 Qualcomm Incorporated Method and apparatus for pilot multiplexing in a wireless communication system
DK2026518T3 (en) * 2006-01-20 2016-01-11 Qualcomm Inc A method and apparatus for pilot muliplexing in a wireless communication system
KR101221706B1 (ko) 2006-01-25 2013-01-11 삼성전자주식회사 고속 패킷 데이터 시스템의 순방향 링크에서 다중 입력 다중 출력 기술을 지원하는 송수신 장치 및 방법
US9461736B2 (en) * 2006-02-21 2016-10-04 Qualcomm Incorporated Method and apparatus for sub-slot packets in wireless communication
ATE495598T1 (de) 2006-02-21 2011-01-15 Qualcomm Inc Feedback-kanalauslegung für kommunikationssysteme mit mehreren ein- und ausgängen (mimo)
US8689025B2 (en) * 2006-02-21 2014-04-01 Qualcomm Incorporated Reduced terminal power consumption via use of active hold state
US8077595B2 (en) 2006-02-21 2011-12-13 Qualcomm Incorporated Flexible time-frequency multiplexing structure for wireless communication
FR2897998A1 (fr) * 2006-02-27 2007-08-31 St Microelectronics Sa Procede et dispositif d'estimation de la fonction de transfert du canal de transmission pour demodulateur cofdm
FR2897999A1 (fr) * 2006-02-27 2007-08-31 St Microelectronics Sa Procede et dispositif d'estimation de la fonction de transfert du canal de transmission pour demodulateur cofdm
WO2007103183A2 (en) * 2006-03-01 2007-09-13 Interdigital Technology Corporation Method and apparatus for channel estimation in an orthogonal frequency division multiplexing system
US8018983B2 (en) * 2007-01-09 2011-09-13 Sky Cross, Inc. Tunable diversity antenna for use with frequency hopping communications protocol
KR100974194B1 (ko) 2007-03-05 2010-08-05 삼성전자주식회사 다중 입출력 무선통신 시스템에서 역호환성을 갖는 공간다중화 장치 및 방법
US8112041B2 (en) * 2007-03-14 2012-02-07 Sharp Kabushiki Kaisha Systems and methods for generating sequences that are nearest to a set of sequences with minimum average cross-correlation
US8611440B2 (en) * 2007-10-30 2013-12-17 Huawei Technologies Co., Ltd. Systems and methods for generating sequences that are nearest to a set of sequences with minimum average cross-correlation
US20080225688A1 (en) * 2007-03-14 2008-09-18 Kowalski John M Systems and methods for improving reference signals for spatially multiplexed cellular systems
US7961587B2 (en) 2007-03-19 2011-06-14 Sharp Laboratories Of America, Inc. Systems and methods for reducing peak to average cross-correlation for sequences designed by alternating projections
US7796639B2 (en) * 2007-03-21 2010-09-14 Motorola Mobility, Inc. Apparatuses and methods for multi-antenna channel quality data acquisition in a broadcast/multicast service network
US8300658B2 (en) * 2007-03-21 2012-10-30 Motorola Mobility Llc Apparatuses and methods for multi-antenna channel quality data acquisition in a broadcast/multicast service network using a multicast symbol
US8406319B2 (en) 2007-03-27 2013-03-26 Motorola Mobility Llc Channel estimator with high noise suppression and low interpolation error for OFDM systems
US20080310383A1 (en) * 2007-06-15 2008-12-18 Sharp Laboratories Of America, Inc. Systems and methods for designing a sequence for code modulation of data and channel estimation
GB0714927D0 (en) * 2007-08-01 2007-09-12 Nokia Siemens Networks Oy Resource allocation
EP3206328B1 (en) 2007-08-08 2020-02-19 Telefonaktiebolaget LM Ericsson (publ) Multiple sounding signal configurations for channel sounding
US8068551B2 (en) * 2007-09-06 2011-11-29 Sharp Laboratories Of America, Inc. Systems and methods for designing a reference signal to be transmitted in a multiplexed cellular system
KR100948400B1 (ko) * 2007-12-29 2010-03-19 (주)카이로넷 Ｏｆｄｍ 시스템 및 상기 ｏｆｄｍ 시스템의 셀간 간섭제거 방법
US9219532B2 (en) * 2008-06-23 2015-12-22 Panasonic Intellectual Property Corporation Of America Method of arranging reference signals and wireless communication base station apparatus
US8811339B2 (en) 2008-07-07 2014-08-19 Blackberry Limited Handover schemes for wireless systems
WO2010003176A1 (en) * 2008-07-07 2010-01-14 Commonwealth Scientific And Industrial Resaerch Organisation Parallel packet transmission
WO2010032687A1 (ja) * 2008-09-19 2010-03-25 シャープ株式会社 移動局装置、移動通信システムおよび送信方法
WO2010039550A2 (en) * 2008-09-23 2010-04-08 Quantenna Communications, Inc. Adjustable operational state wireless mimo
US8644397B2 (en) 2008-09-23 2014-02-04 Qualcomm Incorporated Efficient multiplexing of reference signal and data in a wireless communication system
KR101430981B1 (ko) * 2008-10-13 2014-08-18 삼성전자주식회사 Ｍｉｍｏ 시스템에서 동적 채널 정보 전송 장치 및 방법
MX2011003592A (es) 2008-11-02 2011-04-27 Lg Electronics Inc Metodo previamente codificado para multiplexion espacial en sistema de entrada y salida multiple.
WO2010058911A2 (ko) * 2008-11-23 2010-05-27 엘지전자주식회사 다중안테나 시스템에서 참조신호 전송방법
US8761274B2 (en) * 2009-02-04 2014-06-24 Acorn Technologies, Inc. Least squares channel identification for OFDM systems
KR101589607B1 (ko) * 2009-03-02 2016-01-29 삼성전자주식회사 펨토 기지국과 통신 단말기를 갖는 통신 시스템 및 그의 통신 방법
KR101715939B1 (ko) 2009-06-18 2017-03-14 엘지전자 주식회사 채널 상태 정보 피드백 방법 및 장치
CN101945074B (zh) * 2009-07-04 2014-03-19 中兴通讯股份有限公司 中间导频的发送方法
US8155166B2 (en) * 2009-09-30 2012-04-10 Mitsubishi Electric Research Laboratories, Inc. Reducing inter-carrier-interference in OFDM networks
US8638682B2 (en) 2009-10-01 2014-01-28 Qualcomm Incorporated Method and apparatus for conducting measurements when multiple carriers are supported
US8750089B2 (en) * 2010-01-05 2014-06-10 Broadcom Corporation Method and system for iterative discrete fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques
US8842750B2 (en) * 2010-12-21 2014-09-23 Intel Corporation Channel estimation for DVB-T2 demodulation using an adaptive prediction technique
US20120300864A1 (en) * 2011-05-26 2012-11-29 Qualcomm Incorporated Channel estimation based on combined calibration coefficients
US9036684B2 (en) * 2011-09-28 2015-05-19 Telefonaktiebolaget L M Ericsson (Publ) Spatially randomized pilot symbol transmission methods, systems and devices for multiple input/multiple output (MIMO) wireless communications
JP2014027608A (ja) * 2012-07-30 2014-02-06 Ntt Docomo Inc 基地局装置、ユーザ端末、通信システム及び通信制御方法
TWI467976B (zh) * 2012-09-28 2015-01-01 Mstar Semiconductor Inc 多載波通信系統的頻率偏補估計方法與相關裝置
US9407472B1 (en) 2014-06-18 2016-08-02 Seagate Technology Llc Fast transversal multi-input system
ITUB20159483A1 (it) * 2015-12-23 2017-06-23 Miki Ferrari Dispositivo e sistema per la radiocomunicazione con protocollo mimo
US10361761B2 (en) 2017-01-11 2019-07-23 Qualcomm Incorporated Fast training on multi-antenna systems
US10812216B2 (en) 2018-11-05 2020-10-20 XCOM Labs, Inc. Cooperative multiple-input multiple-output downlink scheduling
US10756860B2 (en) 2018-11-05 2020-08-25 XCOM Labs, Inc. Distributed multiple-input multiple-output downlink configuration
US10659112B1 (en) 2018-11-05 2020-05-19 XCOM Labs, Inc. User equipment assisted multiple-input multiple-output downlink configuration
US10432272B1 (en) 2018-11-05 2019-10-01 XCOM Labs, Inc. Variable multiple-input multiple-output downlink user equipment
CA3119325C (en) 2018-11-27 2023-07-04 XCOM Labs, Inc. Non-coherent cooperative multiple-input multiple-output communications
US10756795B2 (en) 2018-12-18 2020-08-25 XCOM Labs, Inc. User equipment with cellular link and peer-to-peer link
US11063645B2 (en) 2018-12-18 2021-07-13 XCOM Labs, Inc. Methods of wirelessly communicating with a group of devices
US11330649B2 (en) 2019-01-25 2022-05-10 XCOM Labs, Inc. Methods and systems of multi-link peer-to-peer communications
US10756767B1 (en) 2019-02-05 2020-08-25 XCOM Labs, Inc. User equipment for wirelessly communicating cellular signal with another user equipment
US10756782B1 (en) 2019-04-26 2020-08-25 XCOM Labs, Inc. Uplink active set management for multiple-input multiple-output communications
US11032841B2 (en) 2019-04-26 2021-06-08 XCOM Labs, Inc. Downlink active set management for multiple-input multiple-output communications
US10686502B1 (en) 2019-04-29 2020-06-16 XCOM Labs, Inc. Downlink user equipment selection
US10735057B1 (en) 2019-04-29 2020-08-04 XCOM Labs, Inc. Uplink user equipment selection
US11411778B2 (en) 2019-07-12 2022-08-09 XCOM Labs, Inc. Time-division duplex multiple input multiple output calibration
US11411779B2 (en) 2020-03-31 2022-08-09 XCOM Labs, Inc. Reference signal channel estimation
WO2021242574A1 (en) 2020-05-26 2021-12-02 XCOM Labs, Inc. Interference-aware beamforming
KR20230091910A (ko) 2020-10-19 2023-06-23 엑스콤 랩스 인코퍼레이티드 무선 통신 시스템에서의 참조 신호
WO2022093988A1 (en) 2020-10-30 2022-05-05 XCOM Labs, Inc. Clustering and/or rate selection in multiple-input multiple-output communication systems
CN114205194B (zh) * 2021-12-10 2023-09-29 哈尔滨工程大学 水下mimo-ofdm系统非正交导频图案设计方法
JP7422196B1 (ja) * 2022-08-23 2024-01-25 ソフトバンク株式会社 干渉抑圧装置、システム、基地局間制御方法及びプログラム

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08307386A (ja) * 1995-05-01 1996-11-22 Sharp Corp 拡散符号算出方法およびスペクトル拡散通信システム
JP3522619B2 (ja) 2000-01-05 2004-04-26 株式会社エヌ・ティ・ティ・ドコモ マルチキャリアｃｄｍａ伝送システムにおける送信機
US6473467B1 (en) * 2000-03-22 2002-10-29 Qualcomm Incorporated Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system
JP2001308760A (ja) * 2000-04-27 2001-11-02 Nec Eng Ltd 受信装置
US6907270B1 (en) * 2000-10-23 2005-06-14 Qualcomm Inc. Method and apparatus for reduced rank channel estimation in a communications system
EP1374443B1 (en) * 2001-04-05 2006-07-12 Nortel Networks Limited Transmitter for a wireless communications system using multiple codes and multiple antennas
KR20020086167A (ko) * 2001-05-11 2002-11-18 삼성전자 주식회사 직교주파수 분할 다중 시스템에서 다중 전송 안테나를사용하는 채널 변복조 장치 및 방법
US6711124B2 (en) 2001-05-25 2004-03-23 Ericsson Inc. Time interval based channel estimation with transmit diversity
US7027523B2 (en) * 2001-06-22 2006-04-11 Qualcomm Incorporated Method and apparatus for transmitting data in a time division duplexed (TDD) communication system
US7269224B2 (en) 2001-09-17 2007-09-11 Bae Systems Information And Electronic Systems Integration Inc. Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
US7248559B2 (en) 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US20030125040A1 (en) * 2001-11-06 2003-07-03 Walton Jay R. Multiple-access multiple-input multiple-output (MIMO) communication system
US8134976B2 (en) * 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US7002900B2 (en) * 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US7065144B2 (en) * 2003-08-27 2006-06-20 Qualcomm Incorporated Frequency-independent spatial processing for wideband MISO and MIMO systems
US7145940B2 (en) * 2003-12-05 2006-12-05 Qualcomm Incorporated Pilot transmission schemes for a multi-antenna system

Also Published As

Publication number Publication date
NZ547572A (en) 2008-04-30
MXPA06006385A (es) 2006-08-23
KR20060113755A (ko) 2006-11-02
JP2010193480A (ja) 2010-09-02
JP2007513584A (ja) 2007-05-24
KR100820998B1 (ko) 2008-04-08
TWI467951B (zh) 2015-01-01
JP2010239627A (ja) 2010-10-21
EP1700437A1 (en) 2006-09-13
IL176047A0 (en) 2006-10-05
EP2202926A1 (en) 2010-06-30
RU2333610C2 (ru) 2008-09-10
JP5161266B2 (ja) 2013-03-13
JP2010239626A (ja) 2010-10-21
JP2010239628A (ja) 2010-10-21
WO2005057870A1 (en) 2005-06-23
CA2547493A1 (en) 2005-06-23
TW200541242A (en) 2005-12-16
EP2202929A1 (en) 2010-06-30
JP5161265B2 (ja) 2013-03-13
NO20063099L (no) 2006-08-23
BRPI0417242A (pt) 2007-03-06
AU2004297958C1 (en) 2009-06-25
JP2010239629A (ja) 2010-10-21
US7145940B2 (en) 2006-12-05
EP2202927B1 (en) 2014-04-16
EP2202929B1 (en) 2017-11-01
EP2202927A1 (en) 2010-06-30
EP2202928B1 (en) 2017-11-01
AU2004297958A1 (en) 2005-06-23
TWI385948B (zh) 2013-02-11
JP5231482B2 (ja) 2013-07-10
US20060034163A1 (en) 2006-02-16
CA2657472C (en) 2014-08-19
EP2202928A1 (en) 2010-06-30
EP1700437B1 (en) 2014-01-15
JP5226719B2 (ja) 2013-07-03
JP5161264B2 (ja) 2013-03-13
TW201236405A (en) 2012-09-01
CA2547493C (en) 2011-04-12
AU2004297958B2 (en) 2008-09-04
CA2657472A1 (en) 2005-06-23
EP2202926B1 (en) 2017-11-08
RU2006123944A (ru) 2008-01-10

Similar Documents

Publication Publication Date Title
AR046751A1 (es) Esquemas de transmision de piloto para un sistema de multiples antenas
US9960935B2 (en) Hybrid dedicated reference signal method and system
JP4514463B2 (ja) 送信装置及び無線通信方法
AR041985A1 (es) Esquema de transmision para sistemas de multi- portadoras de entrada multiple - salida multiple (mimo)
CN101663837B (zh) 用于在多天线通信系统中传输信号的方法
KR101710515B1 (ko) 고속 이동 환경에서 액세스 포인트 그룹화 방법 및 상기 방법을 이용하는 통신 시스템
US8305956B2 (en) Method, apparatus and system for implementing multi-user virtual multiple-input multiple-output
JP4309110B2 (ja) 適応アンテナ無線通信装置
US8149942B1 (en) Method and system for selecting a transmission scheme in a multiple-input-multiple-output wireless communications system
BRPI0416781A (pt) transmissão por múltiplas antenas para acesso múltiplo por divisão espacial
CN102474315B (zh) 多输入多输出波束赋形数据发送方法和装置
EP2580898B1 (en) MIMO transmission and reception system with decentralized channel estimation and precoding
WO2016013698A1 (ko) 피드백 신호를 전송하는 방법 및 장치
RU2008139699A (ru) Передача пилот-сигнала и оценивание канала для систем с множеством входов и одним выходом (miso) и с множеством входов и множеством выходов (mimo)
Cai et al. Optimal Constellation Design for Indoor $2\times 2$ MIMO Visible Light Communications
Ko et al. Distributed interference alignment for multi-antenna cellular networks with dynamic time division duplex
Fedosov et al. Modeling of systems wireless data transmission based on antenna arrays in underwater acoustic channels
SE521005C2 (sv) En metod och ett system för att använda diversitetsinformation extraherande i upplänken vid nedlänkstransmission
KR20090053599A (ko) 다중 입출력 안테나를 포함하는 시분할다중화무선통신시스템에서 상향 링크 데이터 전송을 위한 송신안테나 선택과 다중 입출력 채널 추정을 위한 데이터송/수신 장치 및 방법
US7412011B2 (en) Joint ratio estimation and weights detection in closed loop transmit diversity
UA83705C2 (ru) Метод и устройство (варианты) для передачи пилот-сигнала и метод и устройство (варианты) для выполнения оценки канала в беспроводной системе связи
TWI410073B (zh) 用於在劃空間多向進接通信系統中執行流加權之方法及裝置
KR101546202B1 (ko) 다중 안테나 시스템에서 신호 전송 방법 및 장치
Fujii Link-adaptable vector-perturbation ZFBF precoder for multi-point 3D-beamformers
JP2010057071A (ja) 復調器および復調方法

Legal Events

Date Code Title Description
FG Grant, registration