CA2248625A1 - Forward link carrier recovery in an ocdma spread spectrum communication system without a pilot tone - Google Patents

Forward link carrier recovery in an ocdma spread spectrum communication system without a pilot tone

Info

Publication number
CA2248625A1
CA2248625A1 CA002248625A CA2248625A CA2248625A1 CA 2248625 A1 CA2248625 A1 CA 2248625A1 CA 002248625 A CA002248625 A CA 002248625A CA 2248625 A CA2248625 A CA 2248625A CA 2248625 A1 CA2248625 A1 CA 2248625A1
Authority
CA
Canada
Prior art keywords
signal
base station
communication system
spread spectrum
ocdma
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.)
Granted
Application number
CA002248625A
Other languages
French (fr)
Other versions
CA2248625C (en
Inventor
Francis D. Natali
John Ohlson
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.)
Alcatel USA Sourcing Inc
Original Assignee
Individual
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
Priority claimed from US08/621,361 external-priority patent/US5764630A/en
Application filed by Individual filed Critical Individual
Publication of CA2248625A1 publication Critical patent/CA2248625A1/en
Application granted granted Critical
Publication of CA2248625C publication Critical patent/CA2248625C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04B1/709—Correlator structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0022—PN, e.g. Kronecker

Landscapes

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

Abstract

A spread spectrum CDMA communication system in which a base station communicates with a plurality of subscriber terminals and the base signal transmitted by the base station is comprised of a set of substantially orthogonal functions which are overlaid with a pseudo-noise (PN) sequence forming a coded spreading sequence for an information signal, each orthogonal function of the set carries data for a single user in the system. Information signals are modulated onto the carrier to form a transmit signal and the coded spreading sequence on the transmit signal for broadcasting, each subscriber terminal having a receiver (41, 50) for coherently demodulating the base station signal. A plurality of correlators (53), each respectively tuned to different functions of the orthogonal signal set, are each followed by an appropriate nonlinearity (55-60) for removing the data modulation. The summed output of the correlators is used to improve the estimate of carrier phase over that obtained with a single correlator.
CA002248625A 1996-03-25 1997-03-24 Forward link carrier recovery in an ocdma spread spectrum communication system without a pilot tone Expired - Fee Related CA2248625C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/621,361 1996-03-25
US08/621,361 US5764630A (en) 1996-03-25 1996-03-25 Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone
PCT/US1997/004281 WO1997036396A1 (en) 1996-03-25 1997-03-24 Forward link carrier recovery in an ocdma spread spectrum communication system without a pilot tone

Publications (2)

Publication Number Publication Date
CA2248625A1 true CA2248625A1 (en) 1997-10-02
CA2248625C CA2248625C (en) 2007-05-29

Family

ID=38150731

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002248625A Expired - Fee Related CA2248625C (en) 1996-03-25 1997-03-24 Forward link carrier recovery in an ocdma spread spectrum communication system without a pilot tone

Country Status (1)

Country Link
CA (1) CA2248625C (en)

Also Published As

Publication number Publication date
CA2248625C (en) 2007-05-29

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20170324