BR0213346A - Sistema cdma-ofdm hìbrido de acesso múltiplo com espalhamento no domìnio da frequência - Google Patents

Sistema cdma-ofdm hìbrido de acesso múltiplo com espalhamento no domìnio da frequência

Info

Publication number
BR0213346A
BR0213346A BR0213346-6A BR0213346A BR0213346A BR 0213346 A BR0213346 A BR 0213346A BR 0213346 A BR0213346 A BR 0213346A BR 0213346 A BR0213346 A BR 0213346A
Authority
BR
Brazil
Prior art keywords
spreading
cdma
multiple access
users
frequency domain
Prior art date
Application number
BR0213346-6A
Other languages
English (en)
Inventor
Jay R Walton
John W Ketchum
Steven J Howard
Mark Wallace
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 BR0213346A publication Critical patent/BR0213346A/pt

Links

Classifications

    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/692—Hybrid techniques using combinations of two or more spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H04L5/026—Multiplexing of multicarrier modulation signals using code division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • 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
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from 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
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

"SISTEMA CDMA-OFDM HìBRIDO DE ACESSO MúLTIPLO COM ESPALHAMENTO EM DOMìNIO DE FREQuêNCIA". Sob um aspecto de um sistema OFDM-CDMA de acesso múltiplo, o espalhamento de dados é feito no domínio de freq³ência pelo espalhamento de cada fluxo de dados com um respectivo código de espalhamento selecionado a partir de um conjunto de códigos de espalhamento disponíveis. Para suportar múltiplo acesso, recursos de sistema podem ser alocados e deslocados para usuários (como, por exemplo, códigos de espalhamento podem ser atribuídos a usuários conforme necessário, e potência de transmissão pode ser alocada para usuários) . Dados de taxa variável para cada usuário podem ser suportados por meio de uma combinação de ajuste de espalhamento e graduação de potência de transmissão. Técnicas de controle de interferência são também fornecidas para melhorar desempenho de sistema por meio de controle de potência das transmissões de downlink e/ou uplink para obter o desejado nível de desempenho enquanto minimiza interferência. Um piloto pode ser transmitido por cada unidade transmissora para ajudar as unidades receptoras a efetuar aquisição, sincronização de tempo, recuperação de portadora, handoff, estimativa de canal, demodulação coerente de dados e assim por diante.
BR0213346-6A 2001-10-18 2002-10-16 Sistema cdma-ofdm hìbrido de acesso múltiplo com espalhamento no domìnio da frequência BR0213346A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/982,280 US20030081538A1 (en) 2001-10-18 2001-10-18 Multiple-access hybrid OFDM-CDMA system
PCT/US2002/033928 WO2003034645A1 (en) 2001-10-18 2002-10-16 Multiple-access hybrid ofdm-cdma system with frequency-domain spreading

Publications (1)

Publication Number Publication Date
BR0213346A true BR0213346A (pt) 2005-04-19

Family

ID=25528999

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0213346-6A BR0213346A (pt) 2001-10-18 2002-10-16 Sistema cdma-ofdm hìbrido de acesso múltiplo com espalhamento no domìnio da frequência

Country Status (9)

Country Link
US (5) US20030081538A1 (pt)
EP (2) EP1895704A1 (pt)
JP (2) JP2005537691A (pt)
KR (2) KR100942276B1 (pt)
CN (1) CN100352192C (pt)
BR (1) BR0213346A (pt)
HK (1) HK1074301A1 (pt)
TW (1) TWI223517B (pt)
WO (1) WO2003034645A1 (pt)

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