EP0727112A1 - Dual-mode wireless unit with two spread-spectrum frequency bands - Google Patents

Dual-mode wireless unit with two spread-spectrum frequency bands

Info

Publication number
EP0727112A1
EP0727112A1 EP95908412A EP95908412A EP0727112A1 EP 0727112 A1 EP0727112 A1 EP 0727112A1 EP 95908412 A EP95908412 A EP 95908412A EP 95908412 A EP95908412 A EP 95908412A EP 0727112 A1 EP0727112 A1 EP 0727112A1
Authority
EP
European Patent Office
Prior art keywords
frequency
spread
dual
frequency bands
megahertz
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.)
Withdrawn
Application number
EP95908412A
Other languages
German (de)
French (fr)
Other versions
EP0727112A4 (en
Inventor
Robert C. Dixon
Jeffrey S. Vanderpool
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
Publication of EP0727112A1 publication Critical patent/EP0727112A1/en
Publication of EP0727112A4 publication Critical patent/EP0727112A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/2634—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for channel frequency control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the invention provides a dual-band spread-spectrum modulator which uses a single, relatively narrow, synthe ⁇ sizer to serve two operating frequency bands.
  • the synthesizer may operate in a high-side injection mode, while in the higher frequency range, the synthesizer may operate in a low-side injection mode.
  • the lower frequency range may comprise about 1850 to 1990 megahertz, while the higher frequency range may comprise about 2400 to 2483.5 megahertz.
  • Figure 1 shows a dual-mode spread-spectrum modulator with two frequency bands.
  • Figure 2 shows a programmable frequency generator
  • Figure 1 shows a dual-mode spread-spectrum modulator with two frequency bands.
  • a first frequency source 101 may generate a first frequency fl 102, while a second frequency source 103 may generate a second frequency f2 104.
  • the first frequency fl 102 and the second frequency f2 104 may be coupled to a multiplier 105, which may generate a bimodal signal 10S with a frequency distribution over two frequency ranges fL 107 and fH 108.
  • the bimodal signal 106 may be coupled to a binary encoder 109, for encoding a data stream 110.
  • the data stream 110 comprising a sequence of data bits 111, may be coupled to the binary encoder 109, which may generate a first frequency, e.g., fL 107, when a data bit 111 in the data stream 110 is a "0" bit, and may generate a second frequency, e.g., fH 108, when a data bit 111 in the data stream 110 is a "1" bit.
  • FIG. 2 shows a programmable frequency generator.
  • a reference frequency signal 201 may be coupled to a multiplier 202.
  • the multiplier 202 may generate a signal f(s) 203, which may be coupled to a voltage-controlled oscillator (VCO) 204.
  • VCO voltage-controlled oscillator
  • the VCO 204 may be coupled to an output node 205, which provides an output frequency signal 206, and may also be coupled in a feedback configuration to the multiplier 202 by way of a programmable divide-by-N counter 207.
  • the programmable divide-by-N counter 208 may be programmed by a set of control lines 209.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Transmitters (AREA)
  • Transceivers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The invention provides a dual-band spread-spectrum modulator (101, 103, 105) which uses a single, relatively narrow, synthesizer to serve two operating frequency bands (102, 104). In the lower frequency band, the synthesizer may operate in a high-side injection mode, while in the higher frequency range, the synthesizer may operate in a low-side injection mode. In a preferred embodiment, the lower frequency range may comprise about 1850 to 1990 megahertz, while the higher frequency range may comprise about 2400 to 2483.5 megahertz.

Description

DESCRIPTION
Dual-Mode Wireless Unit With Two Spread-Spectrum Frequency Bands
Background of the Invention 1. Field of the Invention
This invention relates to a dual mode wireless unit which uses two spread-spectrum communication bands.
2. Description of Related Art
In spread-spectrum modulation in a wireless telephone system, operation in more than one frequency band can be difficult, due to the wide separation between frequency bands. For example, operation in the 900 megahertz and 1800 megahertz bands could require a synthesizer capable of covering approximately 1,000 megahertz in frequency spectrum. However, in hand-held equipment such as tele¬ phones, it is undesirable to use more than one synthesiz¬ er, or even more than one oscillator, due to increased cost, weight, and related considerations.
Accordingly, it would be advantageous to provide a spread-spectrum system in which a single, relatively narrow, synthesizer would serve more than one operating frequency band.
Summary of the Invention
The invention provides a dual-band spread-spectrum modulator which uses a single, relatively narrow, synthe¬ sizer to serve two operating frequency bands. In the lower frequency band, the synthesizer may operate in a high-side injection mode, while in the higher frequency range, the synthesizer may operate in a low-side injection mode. In a preferred embodiment, the lower frequency range may comprise about 1850 to 1990 megahertz, while the higher frequency range may comprise about 2400 to 2483.5 megahertz. Brief Description of the Drawings
Figure 1 shows a dual-mode spread-spectrum modulator with two frequency bands.
Figure 2 shows a programmable frequency generator.
Description of the Preferred Embodiment
Figure 1 shows a dual-mode spread-spectrum modulator with two frequency bands.
A first frequency source 101 may generate a first frequency fl 102, while a second frequency source 103 may generate a second frequency f2 104. The first frequency fl 102 and the second frequency f2 104 may be coupled to a multiplier 105, which may generate a bimodal signal 10S with a frequency distribution over two frequency ranges fL 107 and fH 108. In a preferred embodiment, the lower of the two frequencies fL 107 (fL = fl - f2) may range from about 1850 to 1990 megahertz, while the higher of the two frequencies fH 108 (fH = fl + f2) may range from about 2400 to 2483.5 megahertz. When one of the two frequencies fl and f2, e.g., f2 is chosen between the two ranges, e.g., about 2200 megahertz, the other frequency, e.g., fl may be chosen between about 300 and 440 megahertz.
The bimodal signal 106 may be coupled to a binary encoder 109, for encoding a data stream 110. The data stream 110, comprising a sequence of data bits 111, may be coupled to the binary encoder 109, which may generate a first frequency, e.g., fL 107, when a data bit 111 in the data stream 110 is a "0" bit, and may generate a second frequency, e.g., fH 108, when a data bit 111 in the data stream 110 is a "1" bit. The present invention also provides for monitoring a frequency in each band (or transmitting to a frequency in each band) at once, because both (fl + f2) and (fl - f2) can be stepped down to the same intermediate frequency with a single local oscillator. When the intermediate frequency is 260 MHz and the local oscillator is set to 2180 MHz, the present invention allows operation at both 1920 MHz and 2440 MHz. When the local oscillator is set 10 MHz greater, the present invention then allows opera¬ tion at both 1930 MHz and 2450 MHz, i.e., two frequencies each 10 MHz greater. Thus for paired frequencies, the present invention allows reception or transmission on either frequency (or both) in the pair.
Figure 2 shows a programmable frequency generator. A reference frequency signal 201 may be coupled to a multiplier 202. The multiplier 202 may generate a signal f(s) 203, which may be coupled to a voltage-controlled oscillator (VCO) 204. The VCO 204 may be coupled to an output node 205, which provides an output frequency signal 206, and may also be coupled in a feedback configuration to the multiplier 202 by way of a programmable divide-by-N counter 207. The programmable divide-by-N counter 208 may be programmed by a set of control lines 209.
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. For example, information which is encoded for trans¬ mission is referred to herein as "data", but it would be clear to those of ordinary skill in the art, after perusal of this application, that these data could comprise data, voice (encoded digitally or otherwise) error-correcting codes, control information, or other signals, and that this would be within the scope and spirit of the inven- tion.

Claims

Claims
1. A spread-spectrum modulator having a single frequency synthesizer and operating in a plurality of disjoint output frequency bands.
2. A spread-spectrum modulator, comprising a frequency synthesizer; a multiplier coupled to said frequency synthesiz¬ er; and a binary encoder coupled to said multiplier.
EP95908412A 1993-11-01 1994-10-31 Dual-mode wireless unit with two spread-spectrum frequency bands Withdrawn EP0727112A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US14649293A 1993-11-01 1993-11-01
US146492 1993-11-01
PCT/US1994/012464 WO1995012925A1 (en) 1993-11-01 1994-10-31 Dual-mode wireless unit with two spread-spectrum frequency bands

Publications (2)

Publication Number Publication Date
EP0727112A1 true EP0727112A1 (en) 1996-08-21
EP0727112A4 EP0727112A4 (en) 1998-01-21

Family

ID=22517619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95908412A Withdrawn EP0727112A4 (en) 1993-11-01 1994-10-31 Dual-mode wireless unit with two spread-spectrum frequency bands

Country Status (6)

Country Link
EP (1) EP0727112A4 (en)
JP (1) JP3692140B2 (en)
KR (1) KR960706234A (en)
CA (1) CA2175085A1 (en)
IL (1) IL111471A (en)
WO (1) WO1995012925A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL114924A (en) * 1994-08-18 2000-02-17 Omnipoint Corp Multi-land multi-mode communication system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368439A (en) * 1978-08-24 1983-01-11 Fujitsu Limited Frequency shift keying system
DE3627045A1 (en) * 1986-08-09 1988-05-11 Quante Fernmeldetechnik Gmbh Alarm system
EP0450382A2 (en) * 1990-03-23 1991-10-09 METRICOM, INC. (a Delaware corp.) Method for frequency sharing in a frequency hopping communications network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435821A (en) * 1981-03-24 1984-03-06 Nippon Electric Co., Ltd. Receiver in a frequency hopping communication system
US4979170A (en) * 1988-01-19 1990-12-18 Qualcomm, Inc. Alternating sequential half duplex communication system
AU642571B2 (en) * 1991-01-21 1993-10-21 Sony Corporation Spread spectrum signal receiving apparatus
CA2102914A1 (en) * 1991-05-13 1992-11-26 Robert C. Dixon Dual mode transmitter and receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368439A (en) * 1978-08-24 1983-01-11 Fujitsu Limited Frequency shift keying system
DE3627045A1 (en) * 1986-08-09 1988-05-11 Quante Fernmeldetechnik Gmbh Alarm system
EP0450382A2 (en) * 1990-03-23 1991-10-09 METRICOM, INC. (a Delaware corp.) Method for frequency sharing in a frequency hopping communications network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9512925A1 *

Also Published As

Publication number Publication date
EP0727112A4 (en) 1998-01-21
JPH09504669A (en) 1997-05-06
CA2175085A1 (en) 1995-05-11
IL111471A (en) 1998-06-15
IL111471A0 (en) 1994-12-29
KR960706234A (en) 1996-11-08
WO1995012925A1 (en) 1995-05-11
JP3692140B2 (en) 2005-09-07

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