KR970056503A - Direct Sequence Spread Spectrum OQPSK Chip Modulator - Google Patents

Direct Sequence Spread Spectrum OQPSK Chip Modulator Download PDF

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Publication number
KR970056503A
KR970056503A KR1019950054532A KR19950054532A KR970056503A KR 970056503 A KR970056503 A KR 970056503A KR 1019950054532 A KR1019950054532 A KR 1019950054532A KR 19950054532 A KR19950054532 A KR 19950054532A KR 970056503 A KR970056503 A KR 970056503A
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South Korea
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code
walsh code
channel
spreading
oqpsk
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KR1019950054532A
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Korean (ko)
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KR0155510B1 (en
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이동욱
정재욱
김명진
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양승택
한국전자통신연구원
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    • 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
    • H04L27/36—Modulator circuits; Transmitter circuits

Abstract

본 발명은 직접 시퀀스 확산 스펙트럼(Direct Sequence Spread Spectrum, 이하 DSSS라고 약칭함)의 옵셋 직각위상 쉬프트 킹(Offset Quadrature-Phase Shift Keying, 이하 OQPSK라고 약칭함)의 칩 변조장치에 관한 것으로서, 그 특징은 메시지 신호의 동위상 신호를 보내는 I-채널과 상기 메시지 신호의 직각위상 신호를 보내는 Q-채널을 가지고 있는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치에 있어서, 의사잡음을 발생시키는 의사잡음 발생수단과, 제 1 왈쉬코드를 생성하는 제 1 왈쉬코드 발생수단과, 상기 의사잡음 코드를 상기 제 1 왈쉬코드로 확산시켜 출력하는 제 1 확산수단과, 상기 메시지 신호를 상기 제 1 확산수단의 출력신호로 확산시켜 상기 I-채널로 출력하는 제 1 프리코딩 수단과, 상기 제 1 왈쉬코드와 직교하는 제 2 왈쉬코드를 생성하는 제 2 왈쉬코드 발생수단과, 상기 의사잡음 코드를 상기 제 2 왈쉬코드로 확산시켜 출력하는 제 2 확산수단 및 상기 메시지 신호를 상기 제 2 확산수단의 출력신호로 확산시켜 상기 Q-채널로 출력하는 제 2 프리코딩 수단을 포함하는 데에 있으므로, 본 발명은 종래의 DSSS QPSK 변조장치에 약간의 확산코드와 프리코딩 장치를 결합한 구조로서, DSSS에서 인접 심볼간의 간섭을 없애주며 OQPSK의 특성을 그대로 살려서 시간지연 장치없이 스펙트럼 확산용 코드만으로 구성이 가능하다는 데에 그 효과가 있다.The present invention relates to a chip modulation device of Offset Quadrature-Phase Shift Keying (hereinafter referred to as OQPSK) of Direct Sequence Spread Spectrum (hereinafter, referred to as DSSS). A direct sequence spread spectrum OQPSK chip modulator having an I-channel for sending in-phase signals of a message signal and a Q-channel for sending quadrature signals of the message signal, comprising: pseudo noise generating means for generating pseudo noise; A first Walsh code generating means for generating a first Walsh code, first spreading means for diffusing the pseudo noise code into the first Walsh code and outputting the first Walsh code, and spreading the message signal to an output signal of the first spreading means; First precoding means for outputting the I-channel, second Walsh code generating means for generating a second Walsh code orthogonal to the first Walsh code; A second spreading means for spreading the pseudo noise code into the second Walsh code and outputting the second noise signal; and a second precoding means for spreading the message signal into an output signal of the second spreading means and outputting the signal to the Q-channel. Therefore, the present invention is a structure in which a little spreading code and a precoding device are combined with a conventional DSSS QPSK modulator, eliminating interference between adjacent symbols in the DSSS, and using the characteristics of the OQPSK for spreading spectrum without a time delay device. This has the effect of being configurable with code alone.

Description

직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치Direct Sequence Spread Spectrum OQPSK Chip Modulator

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제5도는 본 발명에 따른 반 칩 지연이 필요없는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치를 64-ary 데이터 변조장치에 적용된 실시예를 도시한 블록도.5 is a block diagram showing an embodiment in which a direct sequence spread spectrum OQPSK chip modulator according to the present invention does not require a half chip delay is applied to a 64-ary data modulator.

제6도는 본 발명에 따른 반 칩 지연이 필요없는 직접 시퀀스 확산 스펙트럼 OQPSK칩 변조장치의 신호 스패이스를 도시한 도면.6 shows a signal space of a direct sequence spread spectrum OQPSK chip modulator without requiring a half chip delay in accordance with the present invention.

Claims (5)

메시지 신호의 동위상 신호를 보내는 I-채널과 상기 메시지 신호의 직각위상 신호를 보내는 Q-채널을 가지고 있는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치에 있어서, 의사잡음을 발생시키는 의사잡음 발생수단과; 제 1 왈쉬코드를 생성하는 제 1 왈쉬코드 발생수단과; 상기 의사잡음 코드를 상기 제 1 왈쉬코드로 확산시켜 출력하는 제 1 확산수단과; 상기 메시지 신호를 상기 제 1 확산수단의 출력신호로 확산시켜 상기 I-채널로 출력하는 제 1 프리코딩 수단과; 상기 제 1 왈쉬코드와 직교하는 제 2 왈쉬코드를 생성하는 제 2 왈쉬코드 발생수단과; 상기 의사잡음 코드를 상기 제 2 왈쉬코드로 확산시켜 출력하는 제 2 확산수단; 및 상기 메시지 신호를 상기 제 2 확산수단의 출력신호로 확산시켜 상기 Q-채널로 출력하는 제 2 프리코딩 수단을 포함하는 것을 특징으로 하는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치.A direct sequence spread spectrum OQPSK chip modulator having an I-channel for sending in-phase signals of a message signal and a Q-channel for sending quadrature signals of the message signal, comprising: pseudo noise generating means for generating pseudo noise; First Walsh code generating means for generating a first Walsh code; First diffusion means for diffusing the pseudo noise code into the first Walsh code and outputting the pseudo noise code; First precoding means for diffusing the message signal into an output signal of the first spreading means and outputting the message signal to the I-channel; Second Walsh code generating means for generating a second Walsh code orthogonal to the first Walsh code; Second diffusion means for diffusing the pseudo noise code into the second Walsh code and outputting the second noise code; And second precoding means for diffusing the message signal into an output signal of the second spreading means and outputting the message signal to the Q-channel. 제1항에 있어서, 상기 제 1 왈쉬코드 발생수단이 발생시키는 상기 제 1 왈쉬코드의 칩율과 상기 제 2 왈쉬코드 발생수단이 발생시키는 상기 제 2 왈쉬코드의 칩율이 상기 의사잡음 발생수단이 생성하는 상기 의사잡음의 칩율과 동일한 것을 특징으로 하는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치.The chip rate of the first Walsh code generated by the first Walsh code generating means and the chip rate of the second Walsh code generated by the second Walsh code generating means are generated by the pseudo noise generating means. A direct sequence spread spectrum OQPSK chip modulator characterized by the same chip rate as the pseudo noise. 제1항에 있어서, 상기 제 1 왈쉬코드 발생수단이 발생시키는 상기 제 1 왈쉬코드와 상기 제 2 왈쉬코드 발생수단이 발생시키는 상기 제 2 왈쉬코드가 아다마르 행렬로부터 구해지는 것을 특징으로 하는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치.The direct sequence according to claim 1, wherein the first Walsh code generated by the first Walsh code generating means and the second Walsh code generated by the second Walsh code generating means are obtained from a Hadamard matrix. Spread Spectrum OQPSK Chip Modulator. 제1항에 있어서, 상기 제 1 확산수단과 상기 제 2 확산수단과 상기 제 1 프리코딩 수단과 상기 제 2 프리코딩 수단이 두 개의 입력신호의 배타적 논리합을 연산하여 출력하는 것을 특징으로 하는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치.The direct sequence of claim 1, wherein the first spreading means, the second spreading means, the first precoding means, and the second precoding means calculate and output an exclusive logical sum of two input signals. Spread Spectrum OQPSK Chip Modulator. 제1항에 있어서, 상기 I-채널의 코드 발생기의 소정 번째의 출력이 상기 Q-채널의 코드 발생기의 소정 번째 출력과 같으면, 상기 I-채널의 코드 발생기의 소정 번째 출력의 다음 출력이 상기 Q-채널의 코드 발생기의 소정 번째의 다음 출력과 1의 보수의 관계에 있으며; 상기 I-채널의 코드 발생기의 소정 번째의 출력이 상기 Q-채널의 코드 발생기의 소정 번째 출력과 1의 보수의 관계에 있으면, 상기 I-채널의 코드 발생기의 소정 번째 출력의 다음 출력이 상기 Q-채널의 코드 발생기의 소정 번째의 다음 출력과 같은 것을 특징으로 하는 직접 시퀀스 확산 스펙트럼 OQPSK 칩 변조장치.2. The method of claim 1, wherein if the predetermined output of the code generator of the I-channel is equal to the predetermined output of the code generator of the Q-channel, then the next output of the predetermined output of the code generator of the I-channel is Q. Is in relation to one's complement with a predetermined next output of the code generator of the channel; If the predetermined output of the code generator of the I-channel is in one's complement relationship with the predetermined output of the code generator of the Q-channel, the next output of the predetermined output of the code generator of the I-channel is Q. A direct sequence spread spectrum OQPSK chip modulator, characterized in that it is equal to the next next output of the code generator of the channel. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950054532A 1995-12-22 1995-12-22 Direct sequence spread spectrum oqpsk chip modulator KR0155510B1 (en)

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KR100269593B1 (en) 1997-12-02 2000-10-16 정선종 Orthogonal complex spreading based modulation method for multichannel transmission
KR100381012B1 (en) 1998-05-04 2003-08-19 한국전자통신연구원 Random connection device for reverse common channel in cdma scheme and method therefor
DE10027216B4 (en) 1999-05-31 2008-10-16 Electronics And Telecommunications Research Institute Apparatus and method for modulating a data message by using Orthogonal Variable Spreading Factor (OVSF) codes in a mobile communication system
KR101329059B1 (en) 2009-11-12 2013-11-14 한국전자통신연구원 Apparatus and method for transmitting packet data in a wireless sensor network

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