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WO1994011978A1 - Etalement du spectre au moyen du decoupage en voies de dix megahertz - Google Patents

Etalement du spectre au moyen du decoupage en voies de dix megahertz Download PDF

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Publication number
WO1994011978A1
WO1994011978A1 PCT/US1993/011065 US9311065W WO9411978A1 WO 1994011978 A1 WO1994011978 A1 WO 1994011978A1 US 9311065 W US9311065 W US 9311065W WO 9411978 A1 WO9411978 A1 WO 9411978A1
Authority
WO
WIPO (PCT)
Prior art keywords
spread
spectrum
communication
center frequency
microwave
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US1993/011065
Other languages
English (en)
Other versions
WO1994011978A9 (fr
Inventor
Douglas G. Smith
Robert C. Dixon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omnipoint Corp
Original Assignee
Omnipoint 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 Omnipoint Corp filed Critical Omnipoint Corp
Priority to AU56689/94A priority Critical patent/AU5668994A/en
Publication of WO1994011978A1 publication Critical patent/WO1994011978A1/fr
Publication of WO1994011978A9 publication Critical patent/WO1994011978A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • 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

Definitions

  • This invention relates to spread-spectrum communi ⁇ cation.
  • the spread-spectrum signal which is generated and transmitted has a spreading bandwidth which exceeds the bandwidth of the data stream.
  • Some examples of such other users are microwave communication users (such as the Opertional Fixed Services using microwave communication towers) and cellular com ⁇ munication users (such as those using cellular tele- phones) . Accordingly, it would be advantageous to avoid interference with microwave and cellular communication users.
  • the transmitted signal may be subject to various forms of frequency-selective fading, which may cause the signal to fade or drop out over a localized range of frequencies.
  • frequency-selective fading may cause the signal to fade or drop out over a localized range of frequencies.
  • spread-spectrum signals are distributed over a wider range of frequencies than narrowband signals, they may also be subject to frequency-selective fading over a portion of their spreading bandwidth. Accordingly, it would be advan ⁇ tageous to mitigate the effect of frequency-selective fading.
  • the invention provides a technique for spread- spectrum communication which reduces interference from microwave and cellular communication users, especially when transmitting in a communication band generally used by those users.
  • the invention provides a spread-spectrum technique having a spreading bandwidth of about 10 MHZ, in combination with a known center fre- quency.
  • the known center frequency may be within a microwave communication band or a cellular communication band.
  • Figure 1 shows a block diagram of a spread-spectrum communication transmitter and receiver.
  • FIG. 1 shows a block diagram of a spread-spectrum communication transmitter and receiver.
  • a spread-spectrum transmitter 1 may comprise an input port 2 for input data 3, a chip sequence transmitter generator 4, and a transmitting antenna 5 for transmitting a spread-spectrum signal 6.
  • a spread-spectrum receiver 7 may comprise a receiver antenna 8, a chip sequence receiver generator 9, and an output port 10 for output data 11.
  • a single chip sequence 12 is identically generated by both the trans ⁇ mitter generator 4 and the receiver generator 9, and appears essentially random to others not knowing the spreading code upon which it is based.
  • An extensive discussion of spread-spectrum communication, spreading codes, and chip sequences, may be found in R. Dixon, SPREAD-SPECTRUM SYSTEMS (2d ed. 1984) .
  • the spread-spectrum signal 6 may have a spreading bandwidth which exceeds the bandwidth of the input data 3.
  • the spread-spectrum signal 6 may also be modulated onto a communication channel having a center frequency, with the center frequency and the spreading bandwidth substantially defining a communication channel.
  • the communication channel may also have a known signal dropoff for energy outside the limits of the channel .
  • a spreading bandwidth of about 10 megahertz (MHZ) offers several advantages in spread-spectrum wireless communication. These advantages include: o minimizing interference with microwave communication users when transmitting in a microwave communication band such as the 1850-- 1990 MHZ communication band; o minimizing interference with, and maximizing compatibility with, cellular communication users when transmitting in a cellular communication band such as the cellular communication bands near 800--900 MHZ and other cellular communication bands; o mitigating the effect of frequency-selective fading when transmitting using a spread-spectrum technique; o allowing the same spread-spectrum technique to be used in other communication bands, such as the 902--928 MHZ band and the 2400--2483.5 MHZ band; and o other and further advantages which are detailed in, and which would appear from, the technical appendix, to those of ordinary skill in the art, after perusal of the specification, drawing and claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention se rapporte à une technique de communication par étalement du spectre, qui permet de réduire les interférences provenant d'utilisateurs de systèmes de transmission cellulaires ou en hyperfréquence, en particulier au cours de la transmission dans une bande généralement utilisée par ces utilisateurs (1, 7). L'invention se rapporte en particulier à une technique à étalement de spectre présentant une largeur de bande à étalement d'environ 10 MHZ, combinée à une fréquence centrale connue. Selon un mode préféré de réalisation, la fréquence centrale connue peut se situer à l'intérieur d'une bande de transmission en hyperfréquence ou d'une bande de transmission cellulaire.
PCT/US1993/011065 1992-11-16 1993-11-15 Etalement du spectre au moyen du decoupage en voies de dix megahertz Ceased WO1994011978A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU56689/94A AU5668994A (en) 1992-11-16 1993-11-15 Spread-spectrum using ten-megahertz channelization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97670092A 1992-11-16 1992-11-16
US07/976,700 1992-11-16

Publications (2)

Publication Number Publication Date
WO1994011978A1 true WO1994011978A1 (fr) 1994-05-26
WO1994011978A9 WO1994011978A9 (fr) 1994-07-07

Family

ID=25524369

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/011065 Ceased WO1994011978A1 (fr) 1992-11-16 1993-11-15 Etalement du spectre au moyen du decoupage en voies de dix megahertz

Country Status (2)

Country Link
AU (1) AU5668994A (fr)
WO (1) WO1994011978A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273109B1 (fr) * 2000-04-13 2006-11-15 The Boeing Company Interface sans fil pour dispositifs electroniques situes dans des espaces fermes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479227A (en) * 1982-09-02 1984-10-23 Motorola, Inc. Auto-balance method and apparatus for suppression of residual lines in a transmitted spectrum
US4972431A (en) * 1989-09-25 1990-11-20 Magnavox Government And Industrial Electronics Company P-code-aided global positioning system receiver
US5025452A (en) * 1990-03-20 1991-06-18 Andrew Corporation Full-duplex, sub-band spread spectrum communications system
US5029184A (en) * 1990-01-24 1991-07-02 Harris Corporation Low probability of intercept communication system
US5218618A (en) * 1990-11-07 1993-06-08 Hughes Aircraft Company Cellular telephone service using spread spectrum transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479227A (en) * 1982-09-02 1984-10-23 Motorola, Inc. Auto-balance method and apparatus for suppression of residual lines in a transmitted spectrum
US4972431A (en) * 1989-09-25 1990-11-20 Magnavox Government And Industrial Electronics Company P-code-aided global positioning system receiver
US5029184A (en) * 1990-01-24 1991-07-02 Harris Corporation Low probability of intercept communication system
US5025452A (en) * 1990-03-20 1991-06-18 Andrew Corporation Full-duplex, sub-band spread spectrum communications system
US5218618A (en) * 1990-11-07 1993-06-08 Hughes Aircraft Company Cellular telephone service using spread spectrum transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273109B1 (fr) * 2000-04-13 2006-11-15 The Boeing Company Interface sans fil pour dispositifs electroniques situes dans des espaces fermes

Also Published As

Publication number Publication date
AU5668994A (en) 1994-06-08

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