BR9201035A - Sistema de satelite de comunicacao possuindo uma densidade de saida de energia aumentada por unidade de largura da faixa - Google Patents

Sistema de satelite de comunicacao possuindo uma densidade de saida de energia aumentada por unidade de largura da faixa

Info

Publication number
BR9201035A
BR9201035A BR929201035A BR9201035A BR9201035A BR 9201035 A BR9201035 A BR 9201035A BR 929201035 A BR929201035 A BR 929201035A BR 9201035 A BR9201035 A BR 9201035A BR 9201035 A BR9201035 A BR 9201035A
Authority
BR
Brazil
Prior art keywords
satellite system
energy output
track width
communication satellite
output density
Prior art date
Application number
BR929201035A
Other languages
English (en)
Portuguese (pt)
Inventor
Mohammad Soleimani
Sasan Rostami
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of BR9201035A publication Critical patent/BR9201035A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • 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
    • 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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • 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
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0028—Correction of carrier offset at passband only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0053—Closed loops
    • H04L2027/0057—Closed loops quadrature phase

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
BR929201035A 1991-03-26 1992-03-25 Sistema de satelite de comunicacao possuindo uma densidade de saida de energia aumentada por unidade de largura da faixa BR9201035A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/674,746 US5208829A (en) 1991-03-26 1991-03-26 Communication satellite system having an increased power output density per unit of bandwidth

Publications (1)

Publication Number Publication Date
BR9201035A true BR9201035A (pt) 1992-12-01

Family

ID=24707740

Family Applications (1)

Application Number Title Priority Date Filing Date
BR929201035A BR9201035A (pt) 1991-03-26 1992-03-25 Sistema de satelite de comunicacao possuindo uma densidade de saida de energia aumentada por unidade de largura da faixa

Country Status (10)

Country Link
US (1) US5208829A (OSRAM)
EP (1) EP0505771B1 (OSRAM)
JP (1) JPH0761038B2 (OSRAM)
KR (1) KR950011075B1 (OSRAM)
AU (1) AU640864B2 (OSRAM)
BR (1) BR9201035A (OSRAM)
CA (1) CA2055387C (OSRAM)
DE (1) DE69213284T2 (OSRAM)
MX (1) MX9201341A (OSRAM)
TW (1) TW230854B (OSRAM)

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DE69325224T2 (de) * 1992-09-24 1999-11-11 Canon K.K., Tokio/Tokyo Verfahren zur Frequenzkammspreizspektrummodulation
US5533046A (en) * 1992-10-08 1996-07-02 Lund; Vanmetre Spread spectrum communication system
US5363401A (en) * 1993-02-25 1994-11-08 Harris Corporation Mechanism for extracting hybrid (fh/ds) spread spectrum signals within multi-signal type environment
US5335249A (en) * 1993-07-29 1994-08-02 Seattle Silicon Corporation Method and apparatus for spread spectrum communications
US5377225A (en) * 1993-10-19 1994-12-27 Hughes Aircraft Company Multiple-access noise rejection filter for a DS-CDMA system
US5377226A (en) * 1993-10-19 1994-12-27 Hughes Aircraft Company Fractionally-spaced equalizer for a DS-CDMA system
US5459758A (en) * 1993-11-02 1995-10-17 Interdigital Technology Corporation Noise shaping technique for spread spectrum communications
KR100217715B1 (ko) * 1993-12-31 1999-09-01 윤종용 직접확산/부호분할 다중접근 시스템에서의 업-링크 접근 시스템
US5574747A (en) 1995-01-04 1996-11-12 Interdigital Technology Corporation Spread spectrum adaptive power control system and method
US5790601A (en) * 1995-02-21 1998-08-04 Hughes Electronics Low cost very small aperture satellite terminal
US5774788A (en) * 1995-03-17 1998-06-30 Hughes Electronics Remote ground terminal having an outdoor unit with a frequency-multiplier
US6795687B1 (en) 1998-04-06 2004-09-21 Virtual Geosatellite Llc Elliptical satellite system emulating characteristics of geosynchronous satellites during the apogee portion of an elliptical orbit
US5845206A (en) * 1995-03-24 1998-12-01 Virtual Geosatellite Holdings, Inc. Elliptical satellite system which emulates the characteristics of geosynchronous satellites
US5640416A (en) * 1995-06-07 1997-06-17 Comsat Corporation Digital downconverter/despreader for direct sequence spread spectrum communications system
US5712866A (en) * 1995-07-18 1998-01-27 Westinghouse Electric Corporation Small low powered digital transmitter for covert remote surveillance
US5796959A (en) * 1995-10-12 1998-08-18 Interdigital Technology Corporation Noise shaping technique for spread spectrum communications
US6029058A (en) 1996-07-19 2000-02-22 The Board Of Trustee Of The Leland Stanford Junior University Spectrum control for direct conversion radio frequency reception
US6018553A (en) * 1996-09-18 2000-01-25 Wireless Access Multi-level mixer architecture for direct conversion of FSK signals
US5956620A (en) 1997-01-17 1999-09-21 Com Dev Limited Analog processor for digital satellites
US6021268A (en) * 1997-08-21 2000-02-01 Analytical Graphics, Inc. Method and apparatus for modeling receiver bandwidth for telecommunications analysis
US6047162A (en) 1997-09-25 2000-04-04 Com Dev Limited Regional programming in a direct broadcast satellite
US6075781A (en) * 1997-12-12 2000-06-13 Stanford Telecommunications, Inc. Flux density reduction in OCDMA satellite communication system
US6590872B1 (en) * 1997-12-12 2003-07-08 Thomson Licensing S.A. Receiver with parallel correlator for acquisition of spread spectrum digital transmission
DE19860909A1 (de) * 1997-12-31 1999-09-16 Schleifring & Apparatebau Gmbh Vorrichtung zur störarmen Signalübertragung
US6477200B1 (en) * 1998-11-09 2002-11-05 Broadcom Corporation Multi-pair gigabit ethernet transceiver
US6301310B1 (en) 1998-12-14 2001-10-09 Hughes Electronics Corporation Efficient implementation for systems using CEOQPSK
US6879817B1 (en) * 1999-04-16 2005-04-12 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US6731706B1 (en) * 1999-10-29 2004-05-04 Intel Corporation Square root raised cosine symmetric filter for mobile telecommunications
US6473597B1 (en) 2000-04-12 2002-10-29 Thomas M. Johnson Method and apparatus for modeling transmitter bandwidth for telecommunications analysis
US6859652B2 (en) 2000-08-02 2005-02-22 Mobile Satellite Ventures, Lp Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis
AU2001284688B2 (en) * 2000-08-02 2006-07-06 Atc Technologies, Llc Coordinated satellite-terrestrial frequency reuse
US7792488B2 (en) 2000-12-04 2010-09-07 Atc Technologies, Llc Systems and methods for transmitting electromagnetic energy over a wireless channel having sufficiently weak measured signal strength
KR100705158B1 (ko) * 2000-12-08 2007-04-09 엘지전자 주식회사 복소수 기저대역 정합필터를 갖는 ｖｓｂ 수신기
US7440489B2 (en) * 2001-08-07 2008-10-21 Ericsson Inc. Method and apparatus for selective demodulation and decoding of communications signals
KR100419281B1 (ko) * 2001-12-27 2004-02-18 한국전자통신연구원 위성통신 송신데이터 처리기 및 그 제어 방법
CN101383663B (zh) * 2008-10-23 2012-10-10 山东科技大学 一种透地通信系统
CN106681456A (zh) * 2016-12-06 2017-05-17 江西鑫田车业有限公司 一种cpu冷却用铝制散热器
CN108957489B (zh) * 2018-05-29 2022-04-05 中国科学院光电研究院 一种低轨卫星导航增强信号的地面测试验证系统及方法
US10491264B1 (en) * 2018-11-12 2019-11-26 Analog Devices Global Unlimited Company Combined demodulator and despreader
CN114422013B (zh) * 2021-12-23 2023-12-08 中国人民解放军63921部队 自适应抗干扰卫星通信方法、装置、系统及设备

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US4455651A (en) * 1980-10-20 1984-06-19 Equatorial Communications Company Satellite communications system and apparatus
DE3278915D1 (en) * 1981-12-31 1988-09-22 Secr Defence Brit Receivers for navigation satellite systems
GB8507903D0 (en) * 1985-03-26 1985-05-01 Tomlinson M Noise-reduction signal processing arrangement
JPS6393233A (ja) * 1986-10-08 1988-04-23 Oki Electric Ind Co Ltd スペクトル拡散通信システム
US4901307A (en) * 1986-10-17 1990-02-13 Qualcomm, Inc. Spread spectrum multiple access communication system using satellite or terrestrial repeaters
US4759034A (en) * 1986-12-02 1988-07-19 General Research Of Electronics, Inc. Multi-step spread spectrum communication apparatus
JPS63151236A (ja) * 1986-12-16 1988-06-23 Matsushita Electric Ind Co Ltd 電力線搬送スペクトラム拡散通信装置
DE3808328C1 (OSRAM) * 1988-03-12 1989-06-29 Standard Elektrik Lorenz Ag, 7000 Stuttgart, De
CH676179A5 (OSRAM) * 1988-09-29 1990-12-14 Ascom Zelcom Ag
US4972430A (en) * 1989-03-06 1990-11-20 Raytheon Company Spread spectrum signal detector

Also Published As

Publication number Publication date
JPH0761038B2 (ja) 1995-06-28
DE69213284D1 (de) 1996-10-10
AU1309992A (en) 1992-10-29
US5208829A (en) 1993-05-04
JPH0591008A (ja) 1993-04-09
KR950011075B1 (ko) 1995-09-27
TW230854B (OSRAM) 1994-09-21
EP0505771B1 (en) 1996-09-04
DE69213284T2 (de) 1997-01-23
AU640864B2 (en) 1993-09-02
CA2055387C (en) 1995-05-16
MX9201341A (es) 1992-10-01
KR920019114A (ko) 1992-10-22
EP0505771A1 (en) 1992-09-30

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Legal Events

Date Code Title Description
FB36 Technical and formal requirements: requirement - article 36 of industrial property law
HO Change of classification

Free format text: INT.CL.6 H04B 7/216

FA8 Dismissal: dismissal - article 36, par. 1 of industrial property law
HHX Correction

Free format text: REFERENTE A RPI 1411 DE 06/01/98

HO Change of classification

Free format text: INT. CL. 6 H04B 7/216