BR0101646A - Sistema de diversidade de transmissão demultiplexação por divisão de frequênciaortogonal para canais de desvanecimentoseletivos por frequência - Google Patents

Sistema de diversidade de transmissão demultiplexação por divisão de frequênciaortogonal para canais de desvanecimentoseletivos por frequência

Info

Publication number
BR0101646A
BR0101646A BR0101646-6A BR0101646A BR0101646A BR 0101646 A BR0101646 A BR 0101646A BR 0101646 A BR0101646 A BR 0101646A BR 0101646 A BR0101646 A BR 0101646A
Authority
BR
Brazil
Prior art keywords
ofdm
frequency
signal
antenna
transmission diversity
Prior art date
Application number
BR0101646-6A
Other languages
English (en)
Inventor
Xiaodong Li
Constantinos B Papadias
Harish Viswanathan
Original Assignee
Lucent Technologies 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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of BR0101646A publication Critical patent/BR0101646A/pt

Links

Classifications

    • 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
    • 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
    • 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
    • H04B7/0667—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 of delayed versions of same signal
    • H04B7/0669—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 of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606—Space-frequency coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0656—Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • 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
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Radio Transmission System (AREA)

Abstract

"SISTEMA DE DIVERSIDADE DE TRANSMISSãO DEMULTIPLEXAçãO POR DIVISãO DE FREQuêNCIAORTOGONAL PARA CANAIS DE DESVANECIMENTOSELETIVOS POR FREQuêNCIA". A comunicação sem fio paracanais de desvanecimento seletivo por freq³ência é efetuada peloemprego de um sistema que inclui OFDM (multiplexação por divisãode freq³ência ortogonal) em combinação com uma disposição dediversidade de transmissão de pelo menos duas antenas.Especificamente, OFDM converte um canal multivias em umapluralidade de sub-canais de banda estreita cada um tendodesvanecimento plano. Então, os sinais nos mesmos subcanais defreq³ência das pelo menos duas antenas são agrupados.Considerando um primeiro sub-canal de freq³ência, durante umprimeiro intervalo de tempo OFDM, um primeiro sinal e um segundosinal são transmitidos no primeiro sub-canal de freq³ência de umaprimeira antena (0) e de uma segunda antena (1) ,respectivamente. Durante um segundo intervalo de tempo OFDM,um conjugado complexo de sinal (-) inverso do segundo sinal e umconjugado complexo do primeiro sinal são transmitidos da primeiraantena e da segunda antena, respectivamente. Em uma versãoespecifica da invenção, obtêm-se uma complexidade reduzida naimplementação por um conjugado complexo de ordem inversa e umconjugado complexo de sinal (-) inverso e de ordem inversa e aseleção judiciosa dos sinais de dados processados para transmitiros apropriados dos sinais durante os primeiros e segundosintervalos OFDM. Novamente, se o canal permanece constantepelos dois intervalos OFDM, a combinação de diversidade éefetuada para cada sub-canal de freq³ência. Em outra versão dainvenção, emprega-se variação de grupo de antenas em conjuntocom a sincronização no tempo dos sinais do sub-canal defreq³ência OFDM para obter maior diversidade de transmissão semperda de velocidade.
BR0101646-6A 2000-05-09 2001-04-30 Sistema de diversidade de transmissão demultiplexação por divisão de frequênciaortogonal para canais de desvanecimentoseletivos por frequência BR0101646A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/568,170 US7020072B1 (en) 2000-05-09 2000-05-09 Orthogonal frequency division multiplexing transmit diversity system for frequency-selective fading channels

Publications (1)

Publication Number Publication Date
BR0101646A true BR0101646A (pt) 2001-12-26

Family

ID=24270190

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0101646-6A BR0101646A (pt) 2000-05-09 2001-04-30 Sistema de diversidade de transmissão demultiplexação por divisão de frequênciaortogonal para canais de desvanecimentoseletivos por frequência

Country Status (9)

Country Link
US (1) US7020072B1 (pt)
EP (1) EP1156598B1 (pt)
JP (1) JP3768831B2 (pt)
KR (1) KR100719785B1 (pt)
CN (1) CN1323109A (pt)
AU (1) AU4028701A (pt)
BR (1) BR0101646A (pt)
CA (1) CA2341808A1 (pt)
DE (1) DE60138506D1 (pt)

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Also Published As

Publication number Publication date
US7020072B1 (en) 2006-03-28
EP1156598A2 (en) 2001-11-21
JP2002009735A (ja) 2002-01-11
JP3768831B2 (ja) 2006-04-19
AU4028701A (en) 2001-11-15
KR100719785B1 (ko) 2007-05-21
KR20010104656A (ko) 2001-11-26
DE60138506D1 (de) 2009-06-10
EP1156598A3 (en) 2005-11-30
EP1156598B1 (en) 2009-04-29
CA2341808A1 (en) 2001-11-09
CN1323109A (zh) 2001-11-21

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