KR960009453B1 - Non-coherent hamadad demodulator - Google Patents

Non-coherent hamadad demodulator Download PDF

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Publication number
KR960009453B1
KR960009453B1 KR94002469A KR19940002469A KR960009453B1 KR 960009453 B1 KR960009453 B1 KR 960009453B1 KR 94002469 A KR94002469 A KR 94002469A KR 19940002469 A KR19940002469 A KR 19940002469A KR 960009453 B1 KR960009453 B1 KR 960009453B1
Authority
KR
South Korea
Prior art keywords
receiving
channel
coherent
demodulator
output
Prior art date
Application number
KR94002469A
Other languages
Korean (ko)
Other versions
KR950026133A (en
Inventor
Dong-Kwan Shin
Hyung-Sook Park
Original Assignee
Korea Electronics Telecomm
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 Korea Electronics Telecomm filed Critical Korea Electronics Telecomm
Priority to KR94002469A priority Critical patent/KR960009453B1/en
Publication of KR950026133A publication Critical patent/KR950026133A/en
Application granted granted Critical
Publication of KR960009453B1 publication Critical patent/KR960009453B1/en

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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
    • H04B1/70718—Spread spectrum techniques using direct sequence modulation with asynchronous demodulation, i.e. not requiring code synchronisation
    • 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
    • H04B1/7093—Matched filter type
    • 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
    • H04B1/7093—Matched filter type
    • H04B2001/70935—Matched filter type using a bank of matched fileters, e.g. Fast Hadamard Transform

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The demodulator includes a multiplier(8) for receiving a signal which is outputted from first and second squarers(5,6) and combined by a combiner(7) as one input, first and second quantifiers(9,10) for receiving I-channel and Q-channel signals which passed through first and second low passs filter(3,4) and outputting +1/-1, first and second envelop detectors(11,12) for receiving the I-channel and Q-channel signals respectively, a maximum value selecting circuit(13) for selecting larger one from the output values of the first and second envelop detectors(11,12), a multiplexer(14) for receiving the output signals of the first and second quantifiers and output signals of the first and second envelop detectors and supplying its output signal to the another input of the multiplier(8), and a number of determining circuits(17-17k) for outputting non-coherent maximum likehood demodulation value.
KR94002469A 1994-02-08 1994-02-08 Non-coherent hamadad demodulator KR960009453B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR94002469A KR960009453B1 (en) 1994-02-08 1994-02-08 Non-coherent hamadad demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR94002469A KR960009453B1 (en) 1994-02-08 1994-02-08 Non-coherent hamadad demodulator

Publications (2)

Publication Number Publication Date
KR950026133A KR950026133A (en) 1995-09-18
KR960009453B1 true KR960009453B1 (en) 1996-07-19

Family

ID=19377085

Family Applications (1)

Application Number Title Priority Date Filing Date
KR94002469A KR960009453B1 (en) 1994-02-08 1994-02-08 Non-coherent hamadad demodulator

Country Status (1)

Country Link
KR (1) KR960009453B1 (en)

Also Published As

Publication number Publication date
KR950026133A (en) 1995-09-18

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