KR940019099A - 시분할 다중 통신 채널용 디지탈 복조방법 및 회로 - Google Patents
시분할 다중 통신 채널용 디지탈 복조방법 및 회로 Download PDFInfo
- Publication number
- KR940019099A KR940019099A KR1019930001245A KR930001245A KR940019099A KR 940019099 A KR940019099 A KR 940019099A KR 1019930001245 A KR1019930001245 A KR 1019930001245A KR 930001245 A KR930001245 A KR 930001245A KR 940019099 A KR940019099 A KR 940019099A
- Authority
- KR
- South Korea
- Prior art keywords
- digital
- signal
- channel
- dqpsk
- phase
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract 7
- 230000007704 transition Effects 0.000 claims abstract 5
- 230000001360 synchronised effect Effects 0.000 claims abstract 3
- 238000005314 correlation function Methods 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 3
- 230000005856 abnormality Effects 0.000 claims 1
- 239000000969 carrier Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000009977 dual effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/212—Time-division multiple access [TDMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
- H04L2027/003—Correction of carrier offset at baseband only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0046—Open loops
- H04L2027/0048—Frequency multiplication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims (5)
- 디지탈 복조기에 있어서, π/4-DQPSK 방식으로 변조된 수신신호를 기저대역으로 천이시켜 I채널 및 Q채널로 분리하는 채널분리 수단과, 분리된 기저대역 I채널 및 Q채널 신호를 디지탈 신호로 변환하는 아날로그 디지탈 변환 수단과, 상기 디지탈 변환된 I채널 및 Q채널 신호를 저장하는 중간버퍼메모리 수단과, 상기 2진 기준트레이닝 테이타 열에 대한 π/4-DQPSK 변조파형을 저장하고 있는 기준파형 저장메모리 수단과, 상기 디지탈 변환된 수신신호와 상기 기준파형 저장메모리에 저장되어 있는 기준변조 파형에 대한 복조상관함수 값을 계산하여 시간 동기를 수행하는 시간동기수단과, 상기 시간동기된 수신신호로부터 I,Q 각 채널의 수신신호 크기 값을 이용하여 수신위상을 결정하는 수신위상 결정수단과, 상기 수신위상결정 수단에서 결정된 수신위상간의 차 값을 검출하여 2진 데이타를 2진 데이타 복원하는 수다을 포함하여 구성됨을 특징으로 하는 π/4-DQPSK 복조기.
- 제1항에 있어서, 상기 아나로그 디지탈 신호변환 수단이 샘플링용 클럭을 송신단과 동기되지 않은 임의의 K(K>4) 배 클럭을 사용하고 각 샘플값을 n(n>8)비트 단위로 양자화 함을 특징으로 하는 π/4-DQPSK 복조기.
- 제1항에 있어서, 시간동기 수단과 수신위상결정수단 및 수신위상으로 부터 차동 위상검출을 수행하여 최종 2진 데이타를 복원하는 복원수단이 디지탈 처리됨을 특징으로 하는 π/4-DQPSK 복조기.
- 디지탈 복조기에 있어서, 안테나로 부터 수신된 π/4-DQPSK 변조신호를 수신여파기(201)에서 필터링한후 승산기(202,203)에서 국부발진기(213)의 국부반송파(fo)와 승산하여 기저대역으로 천이시킴과 동시에 I,Q채널로 분리하되, 상기 국부반송파(fo)의 신호를 π/2위상천이기(204)에서 90˚ 쉬프트한 신호를 승산기(203)에서 승산하여 Q채널로 분리되어 출력토록하는 천이 및 I,Q채널분리부(220)와, 상기 승산기(202,203)에서 분리된 I,Q채널의 출력을 저역여파하고 제1,2저역통과여파기(205,206)와, 상기 제1,2저역통과여파기(205,206)에서 여파된 상기 천이 및 I,Q채널 분리부(200)의 출력천이된 기저대역 I,Q채널 아날로그 신호를 디지탈로 변환하는 제1, 2A/D변환기(207,208)와, 상기 제1,2A/D변환기(207,208)의 출력을 처리하기 위해 써지는 데이타의 읽어가는 속도가 다르기 때문에 완충하기 위한 이중포트메모리로 구성된 중간버퍼메모리(217)와, 트레이닝 데이타 열에 대한 변조신호 값을 저장하고 있는 기준파형 저장메모리(209)와, 상기 중간버퍼메모리(217)의 출력과 상기 기준파형 저장메모리(209) 기준 트레이닝 데이타 열에 대한 변조신호 값과 복조상관함수 값의 계산을 통해 타임슬롯내의 각 데이타별 위치를 검출하는 시간동기부(218)와, 상기 시간동기부(218)의 출력으로부터 π/4-DQPSK 변조된 신호의 I,Q 채널신호 값이 나타내는 특성에 의해 매주기(T)마다 수신위상을 결정하는 수신위상결정부(210)와, 상기 수신위상결정부(210)의 출력신호에 대해 송신단에서 변조시 발생된 차동위상 엔코딩되어진 위상차를 검출하고 상기 검출된 위상값들에 대하여 π/4-DQPSK 변조특성에 따라 2진 데이타를 결정하는 차동위상검출 및 2진 데이타결정부(211)와, 상기 차동위상검출 및2진 데이타결정부(211)의 출력이 하나의 차동 위상값에 대하여 2비트 단위씩 한꺼번에 결정되므로 직렬로 변환하여 2진 데이타로 복조하는 병/직렬변환기(212)로 구성됨을 특징으로 하는 시분할 다중통신 채널용 디지탈 복조방법.
- 시분할 다중통신 채널용 π/4-DQPSK 디자탈 복조회로에 있어서, 디지탈 데이타로 변환된 수신데이타를 받아 복조상관함수 값을 계산하는 제2과정과, 상기 제1과정에서 계산된 상관함수에 따라 최대 피이크점을 검출하는 제1과정과, 상기 제2과정의 검출값을 정보로하여 I,Q 각 채널 디지탈 수신신호 즉 2X(L) 데이타 열을 선택하여 수신 이상을 결정하는 제3과정과, 상기 제3과정의 결정된 수신 위상에 따라 차위상을 디코딩하여 2진 데이타를 결정한후 직렬로 변환하여 복조된 2진 데이타 열을 발생하는 제4과정을 이루어짐을 특징으로 하는 시분할 다중통신 채널용 디지탈 복조방법※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930001245A KR960011125B1 (ko) | 1993-01-30 | 1993-01-30 | 시분할 다중 통신 채널용 디지탈 복조 회로 |
US08/176,451 US5588027A (en) | 1993-01-30 | 1993-12-30 | Digital demodulating method and circuit for use in a time-division multiple access channel |
JP00960094A JP3188356B2 (ja) | 1993-01-30 | 1994-01-31 | 時分割多重通信チャネル用ディジタル復調方法及び回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930001245A KR960011125B1 (ko) | 1993-01-30 | 1993-01-30 | 시분할 다중 통신 채널용 디지탈 복조 회로 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR940019099A true KR940019099A (ko) | 1994-08-19 |
KR960011125B1 KR960011125B1 (ko) | 1996-08-20 |
Family
ID=19350193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1019930001245A KR960011125B1 (ko) | 1993-01-30 | 1993-01-30 | 시분할 다중 통신 채널용 디지탈 복조 회로 |
Country Status (3)
Country | Link |
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US (1) | US5588027A (ko) |
JP (1) | JP3188356B2 (ko) |
KR (1) | KR960011125B1 (ko) |
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-
1993
- 1993-01-30 KR KR1019930001245A patent/KR960011125B1/ko not_active IP Right Cessation
- 1993-12-30 US US08/176,451 patent/US5588027A/en not_active Expired - Lifetime
-
1994
- 1994-01-31 JP JP00960094A patent/JP3188356B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5588027A (en) | 1996-12-24 |
JPH06318962A (ja) | 1994-11-15 |
JP3188356B2 (ja) | 2001-07-16 |
KR960011125B1 (ko) | 1996-08-20 |
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