CA2076006A1 - Cdma subtractive demodulation - Google Patents

Cdma subtractive demodulation

Info

Publication number
CA2076006A1
CA2076006A1 CA002076006A CA2076006A CA2076006A1 CA 2076006 A1 CA2076006 A1 CA 2076006A1 CA 002076006 A CA002076006 A CA 002076006A CA 2076006 A CA2076006 A CA 2076006A CA 2076006 A1 CA2076006 A1 CA 2076006A1
Authority
CA
Canada
Prior art keywords
composite signal
signal
signals
decoding
strongest
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
CA002076006A
Other languages
French (fr)
Other versions
CA2076006C (en
Inventor
Paul W. Dent
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.)
Ericsson 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
Application filed by Individual filed Critical Individual
Publication of CA2076006A1 publication Critical patent/CA2076006A1/en
Application granted granted Critical
Publication of CA2076006C publication Critical patent/CA2076006C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B1/71072—Successive interference cancellation
    • 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
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B2001/71077—Partial interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates

Abstract

Subtractive CDMA demodulation optimally decodes a coded information signal embedded in many other overlapping signals making up a received, composite signal. A radio receiver correlates a unique code corresponding to the desired signal to be decoded with the composite signal. As a result, subsequent correlations are performed with greater accuracy.
Subtractive CDMA demodulation is enhance by decoding the composite signal in the order of the strongest to weakest signal strength. Interference caused by the presence of the strongest information signal and the composite signal during the decoding of weaker signals is removed. The individual information signals are assigned a unique block error correction code (44) which is correlated with the composite signal using Fast Walsh transforms. Correlated signals are recoded using inverted Fast Walsh transforms (46) and removed from the composite signal.
CA002076006A 1990-12-17 1991-12-17 Cdma subtractive demodulation Expired - Lifetime CA2076006C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US628,359 1984-07-06
US07/628,359 US5151919A (en) 1990-12-17 1990-12-17 Cdma subtractive demodulation
PCT/US1991/009174 WO1992011716A1 (en) 1990-12-17 1991-12-17 Cdma subtractive demodulation

Publications (2)

Publication Number Publication Date
CA2076006A1 true CA2076006A1 (en) 1992-06-18
CA2076006C CA2076006C (en) 2001-08-07

Family

ID=24518547

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002076006A Expired - Lifetime CA2076006C (en) 1990-12-17 1991-12-17 Cdma subtractive demodulation

Country Status (19)

Country Link
US (1) US5151919A (en)
EP (1) EP0491668B1 (en)
JP (1) JP3081642B2 (en)
AT (1) ATE163336T1 (en)
AU (1) AU645646B2 (en)
BR (1) BR9106226A (en)
CA (1) CA2076006C (en)
DE (1) DE69128927T2 (en)
DK (1) DK0491668T3 (en)
ES (1) ES2113876T3 (en)
FI (1) FI108589B (en)
GR (1) GR3026244T3 (en)
HK (1) HK1009366A1 (en)
MX (1) MX9102562A (en)
MY (1) MY107860A (en)
RU (1) RU2104615C1 (en)
SG (1) SG49656A1 (en)
UA (1) UA41256C2 (en)
WO (1) WO1992011716A1 (en)

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US5151919A (en) 1992-09-29
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FI923678A (en) 1992-08-17

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