MX9801459A - Metodo y sistema para proporcionar señalizacion dpsk-psk unificada para comunicaciones por satelite basadas en cdma. - Google Patents

Metodo y sistema para proporcionar señalizacion dpsk-psk unificada para comunicaciones por satelite basadas en cdma.

Info

Publication number
MX9801459A
MX9801459A MX9801459A MX9801459A MX9801459A MX 9801459 A MX9801459 A MX 9801459A MX 9801459 A MX9801459 A MX 9801459A MX 9801459 A MX9801459 A MX 9801459A MX 9801459 A MX9801459 A MX 9801459A
Authority
MX
Mexico
Prior art keywords
uplink
downlink
sequence
signal
quadrature
Prior art date
Application number
MX9801459A
Other languages
English (en)
Other versions
MXPA98001459A (es
Inventor
Jin-Meng Ho
Ramautar Sharma
Original Assignee
At & T Corp
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 At & T Corp filed Critical At & T Corp
Publication of MX9801459A publication Critical patent/MX9801459A/es
Publication of MXPA98001459A publication Critical patent/MXPA98001459A/es

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier

Landscapes

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

Abstract

Un método y un sistema para comunicaciones de usuarios multiples en una red de satélite basada en CDMA. Una señal de RF de enlace ascendente que contiene un mensaje de usuario codificado que ha sido codificado por fase diferencialmente y propagado usando una funcion de Walsh y una secuencia de numeros pseusoaleatorios (PN) para el enlace ascendente, es recibida por un receptor de satélite. La señal de RF de enlace ascendente recibida es desmodulada por cuadratura no coherentemente y a continuacion aglutinada usando la secuencia de PN de enlace ascendente y la funcion de Walsh. La señal de fase diferencial que contiene el mensaje de usuario codificado es regenerada a bordo del satélite por comparacion de fases y conmutada a un transmisor de enlace descendente seleccionado. Los componentes de cuadratura de la señal de fase diferencial son entonces repropagados usando una funcion de Walsh y una secuencia de PN para el enlace descendente, seguido por la modulacion por cuadratura para la transmision a un receptor terrestre. La señal de RF de enlace descendente recibida es desmodulada por cuadratura coherentemente y repropagada usando la secuencia Pn y la funcion de Walsh para el enlace descendente. La fase portadora de enlace descendente originada de la fase diferencial de enlace ascendente es regenerada a partir de los componentes de banda fase de cuadratura aglutinados y, en consecuencia, el mensaje de usuario codificado es detectado y decodificado.
MXPA/A/1998/001459A 1997-03-04 1998-02-23 Metodo y sistema para proporcionar señalizacion dpsk-psk unificada para comunicaciones por satelitebasadas en cdma MXPA98001459A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08808777 1997-03-04
US08/808,777 US6072770A (en) 1997-03-04 1997-03-04 Method and system providing unified DPSK-PSK signalling for CDMA-based satellite communications

Publications (2)

Publication Number Publication Date
MX9801459A true MX9801459A (es) 1998-09-30
MXPA98001459A MXPA98001459A (es) 1998-11-16

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Also Published As

Publication number Publication date
EP0863622A2 (en) 1998-09-09
JP4128255B2 (ja) 2008-07-30
CA2214058A1 (en) 1998-09-04
JP2008206177A (ja) 2008-09-04
CA2214058C (en) 2001-08-07
JP4213762B2 (ja) 2009-01-21
US6072770A (en) 2000-06-06
EP0863622A3 (en) 1999-06-16
JPH10294718A (ja) 1998-11-04

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