KR930015473A - QPSK demodulation circuit of Nikham receiver - Google Patents

QPSK demodulation circuit of Nikham receiver Download PDF

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Publication number
KR930015473A
KR930015473A KR1019910023214A KR910023214A KR930015473A KR 930015473 A KR930015473 A KR 930015473A KR 1019910023214 A KR1019910023214 A KR 1019910023214A KR 910023214 A KR910023214 A KR 910023214A KR 930015473 A KR930015473 A KR 930015473A
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KR
South Korea
Prior art keywords
signal
pattern
phase
receiver
qpsk
Prior art date
Application number
KR1019910023214A
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Korean (ko)
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KR950001519B1 (en
Inventor
도광
Original Assignee
이헌조
주식회사 금성사
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Application filed by 이헌조, 주식회사 금성사 filed Critical 이헌조
Priority to KR1019910023214A priority Critical patent/KR950001519B1/en
Publication of KR930015473A publication Critical patent/KR930015473A/en
Application granted granted Critical
Publication of KR950001519B1 publication Critical patent/KR950001519B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits

Abstract

본 발명은 니캄수신기의 QPSK복조회로에 관한 것으로, 간단한 회로구성으로 정확한 I-패턴 및 Q-패턴의 데이타를 복조하기 위한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a QPSK demodulation circuit of a Nikcam receiver, and is for demodulating data of an accurate I-pattern and Q-pattern with a simple circuit configuration.

FM+QPSK복합신호를 밴드 패스 필터없이 입력받아 증폭후 정신호와 반전신호로 버퍼링하고, 외부 발진기의 발진주파수를 QPSK반송파 주파수와 동일한 주파수로 분주시킨 후 45°위상 쉬프트된 신호(f2)에 의거하여 상기 정신호와 반전신호를 각각 스위칭시켜 I-패턴 및 Q-패턴신호로 복조하고, 그 복조신호를 각각 저역통과 필터만으로 파형정형화시켜 니캄프로세서에 입력시키도록 구성되어 있다.After receiving the FM + QPSK complex signal without the band pass filter, amplifying and buffering the signal with the positive signal and the inverted signal, and dividing the oscillation frequency of the external oscillator to the same frequency as the QPSK carrier frequency, based on the 45 ° phase shifted signal (f 2 ). By switching the positive signal and the inverted signal, respectively, and demodulating the I-pattern and Q-pattern signal, the demodulated signal is waveform-formed only by the low pass filter and input to the Nikcam processor.

Description

니캄 수신기의 QPSK복조회로QPSK demodulation circuit of Nikham receiver

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 의한 니캄 수신기의 QPSK복조회로도, 제3도 (가) 내지 (아)는 제2도에 따른 각부 파형도.2 is a QPSK demodulation circuit diagram of a Nikcam receiver according to the present invention, and FIGS. 3 (a) to (h) are respective waveform diagrams according to FIG.

Claims (2)

사운드 중간주파 신호(SiF)를 입력받아 증폭하는 증폭기(11)와, 그 증폭기(11)의 출력신호를 정신호 및 반전신호의 2패스를 버퍼링하는 버퍼부(12)와, 외부 발진기의 발진주파수를 소정 주파수로 분주시키는 분주기(16)와, 그 분주기(16)의 출력신호를 45° 위상 쉬프트시키는 위상쉬프터(17)와, 그 위상쉬프터(17)의 출력신호를 90° 위상 쉬프트시키는 위상쉬프터(18)와, 그 위상쉬프터(17), (18)의 출력신호(f1)(f2)에 의거하여 상기 버퍼부(12)의 정신호 및 반전신호를 스위칭시켜I-패턴 및 Q-패턴신호로 복조하는 제1, 제2스위칭부(13-1),(13-2)와, 그 제1, 제2스위칭부(13-1),(13-2)의 I-패턴 출력신호를 각각 파형정형화하는 저역통과 필터(14-1),(14-2)와, 그 저역통과 필터(14-1)(14-2)의 출력 데이타를 디코딩시켜 직렬데이타로 출력하는 니캄 프로세서(15)로 구성된 것을 특징으로 하는 니캄 수신기의 QPSK 복조회로.An amplifier 11 that receives and amplifies the sound intermediate frequency signal SiF, a buffer unit 12 that buffers the output signal of the amplifier 11 in two passes of a positive signal and an inverted signal, and an oscillation frequency of an external oscillator. A divider 16 for dividing at a predetermined frequency, a phase shifter 17 for shifting the output signal of the divider 16 by 45 degrees, and a phase for shifting the output signal of the phase shifter 17 by 90 degrees. On the basis of the shifter 18 and the output signals f 1 and f 2 of the phase shifters 17 and 18, the positive and inverted signals of the buffer unit 12 are switched to switch the I-pattern and Q-. I-pattern output signals of the first and second switching sections 13-1 and 13-2 and the first and second switching sections 13-1 and 13-2 demodulated by the pattern signal. The low pass filters 14-1 and 14-2 for waveform shaping, and the Nikcam processor 15 for decoding the output data of the low pass filters 14-1 and 14-2 and outputting them as serial data are decoded. Characterized in) By QPSK demodulation of nikam receiver. 제1항에 있어서, 버퍼부(12)는 입력 FM+QPSK 신호를 소정레벨로 증폭하여 정위상신호를 출력하는 연산증폭기(OP1)(OP2)와,그 연산증폭기(OP1)의 증폭신호를 반전시켜 반전위상신호로 출력하는 연산증폭기(OP3)를 포함하여 구성함을 특징으로 하는니캄 수신기의 QPSK 복조회로.The method of claim 1, wherein the buffer unit 12 is amplified in the operational amplifier (OP 1) (OP 2) and the operational amplifier (OP 1) for outputting the in-phase signal and amplifies the input FM + QPSK signal to a predetermined level A QPSK demodulation circuit of a Nikcam receiver, comprising an operational amplifier (OP 3 ) for inverting the signal and outputting the inverted phase signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910023214A 1991-12-17 1991-12-17 Qpsk demodulation circuit of nicam receiver KR950001519B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910023214A KR950001519B1 (en) 1991-12-17 1991-12-17 Qpsk demodulation circuit of nicam receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910023214A KR950001519B1 (en) 1991-12-17 1991-12-17 Qpsk demodulation circuit of nicam receiver

Publications (2)

Publication Number Publication Date
KR930015473A true KR930015473A (en) 1993-07-24
KR950001519B1 KR950001519B1 (en) 1995-02-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910023214A KR950001519B1 (en) 1991-12-17 1991-12-17 Qpsk demodulation circuit of nicam receiver

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MXPA02009345A (en) * 2000-03-28 2003-09-22 Interdigital Tech Corp Cdma system which uses pre rotation before transmission.

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KR950001519B1 (en) 1995-02-25

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