WO1994011978A1 - Spread-spectrum using ten-megahertz channelization - Google Patents

Spread-spectrum using ten-megahertz channelization Download PDF

Info

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
Application number
PCT/US1993/011065
Other languages
French (fr)
Other versions
WO1994011978A9 (en
Inventor
Douglas G. Smith
Robert C. Dixon
Original Assignee
Omnipoint Corporation
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 Corporation filed Critical Omnipoint Corporation
Priority to AU56689/94A priority Critical patent/AU5668994A/en
Publication of WO1994011978A1 publication Critical patent/WO1994011978A1/en
Publication of WO1994011978A9 publication Critical patent/WO1994011978A9/en

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.

Abstract

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 (1, 7). In particular, the invention provides a spread-spectrum technique having a spreading bandwidth of about 10 MHZ, in combination with a known center frequency. In a preferred embodiment, the known center frequency may be within a microwave communication band or a cellular communication band.

Description

DESCRIPTION
Spread-Spectrum Using Ten-Megahertz Channelization
1. Field of the Invention
This invention relates to spread-spectrum communi¬ cation.
2. Description of Related Art In spread-spectrum communication, the spread-spectrum signal which is generated and transmitted has a spreading bandwidth which exceeds the bandwidth of the data stream. When using spread-spectrum techniques for wireless com¬ munication, it may be necessary to avoid or minimize interference with other users of the electromagnetic spectrum. 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.
In wireless communication, 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. Although 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.
Summary of the Invention
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. In particular, the invention provides a spread-spectrum technique having a spreading bandwidth of about 10 MHZ, in combination with a known center fre- quency. In a preferred embodiment, the known center frequency may be within a microwave communication band or a cellular communication band.
Brief Description of the Drawings
Figure 1 shows a block diagram of a spread-spectrum communication transmitter and receiver.
Description of the Preferred Embodiment
The disclosure of the invention may be supplemented by the contents of technical information appended to this specification in a technical appendix, hereby incorporated by reference as if fully set forth herein. No admission is made as to possible prior art effect of any part of the appendi .
Figure 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. In a preferred embodiment, 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 . ) It has been found by the inventors that a particular set of selected values for the spreading bandwidth and the center frequency provide a substantial and surprising advantage when using spread- spectrum techniques for communication for wireless communication.
In particular, it has been found by the inventors that 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. Information relating to construction of a spread- spectrum communication system using a 10 MHZ spreading bandwidth and having known center frequencies may be found in detail in the technical appendix. The specification, drawing, claims, and the technical appendix, in combina¬ tion, contain a written description of the invention, and the manner and process of making and using it, in such full, clear, concise and exact terms as to enable any person skilled in the art to make and use the same. They also set forth the best mode contemplated by the inventors of carrying out the invention.
Alternative Embodiments
While preferred embodiments are disclosed herein, many variations are possible which remain within the concept and scope of the invention,' and these variations would become clear to one of ordinary skill in the art after perusal of the specification, drawings and claims herein.

Claims

Claims
1. A method comprising the steps of encoding a data stream using a spread-spectrum communication technique, said spread-spectrum communication technique generating a spread-spectrum signal with a spreading bandwidth of about 10 megahertz; and transmitting said spread-spectrum signal using a known center frequency.
2. A method as in claim 1, wherein said known center frequency is within a cellular communication range or a microwave communication range.
3. A method as in claim 1, wherein said known center frequency is within an unlicensd spread-spectrum communication band.
PCT/US1993/011065 1992-11-16 1993-11-15 Spread-spectrum using ten-megahertz channelization WO1994011978A1 (en)

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 (en) 1994-05-26
WO1994011978A9 WO1994011978A9 (en) 1994-07-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/011065 WO1994011978A1 (en) 1992-11-16 1993-11-15 Spread-spectrum using ten-megahertz channelization

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273109B1 (en) * 2000-04-13 2006-11-15 The Boeing Company Wireless interface for electronic devices located in enclosed spaces

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 (en) * 2000-04-13 2006-11-15 The Boeing Company Wireless interface for electronic devices located in enclosed spaces

Also Published As

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

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