KR20020065952A - 디지털 중간 주파수 다운 컨버터를 포함하는 복조기 - Google Patents
디지털 중간 주파수 다운 컨버터를 포함하는 복조기 Download PDFInfo
- Publication number
- KR20020065952A KR20020065952A KR1020010006053A KR20010006053A KR20020065952A KR 20020065952 A KR20020065952 A KR 20020065952A KR 1020010006053 A KR1020010006053 A KR 1020010006053A KR 20010006053 A KR20010006053 A KR 20010006053A KR 20020065952 A KR20020065952 A KR 20020065952A
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- South Korea
- Prior art keywords
- signal
- converted
- output
- data
- down converter
- Prior art date
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Classifications
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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
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
- H04L27/3836—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using the received modulated signal or the received IF signal, e.g. by detecting a pilot or by frequency multiplication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
- H04L27/063—Superheterodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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 (3)
- 복조를 위한 입력신호를 디지털 신호로 변환하는 A/D변환기와, 상기 변환된 디지털 신호를 입력받아 제1의 IF 하향 변환을 수행하는 제1다운 컨버터부와, 상기 제1의 IF 하향 변환된 신호를 입력받아 제2의 IF 하향 변환을 수행하는 제2다운 컨버터부와, 상기 제2다운 컨버터의 출력 이득 조절을 수행하여 I 및 Q데이터를 디코더에 공급하는 AGC부와, 상기 이득 조절된 I 및 Q데이터 심볼의 타이밍 복구를 위한 심볼 타이밍 복구기와, 상기 심볼 타이밍 복구기 출력을 필터링하는 루프 필터와, 상기 루프 필터 출력에 따라 상기 제2다운 컨버터부에 소정의 신호를 생성하여 공급하는 심볼NCO와, 상기 I 및 Q 데이터를 입력받아 반송파를 판별하여 출력하는 반송파 판별기와, 상기 반송파 판별기의 출력을 필터링하는 루프 필터와, 상기 루프 필터의 출력에 따라 소정의 신호를 생성하여 상기 제2다운 컨버터부에 공급하는 NCO로 구성된 것을 특징으로 하는 디지털 중간 주파수 다운 컨버터를 포함하는 복조기.
- 제 1 항에 있어서, 상기 제1다운 컨버터부는 전단에서 변환된 디지털 신호를 혼합하여 하향 변환된 IF신호를 출력하기 위한 믹서기 및, 상기 믹서기에 하향 변환을 위한 소정의 데이터를 공급하는 카운터를 포함하여 이루어진 것을 특징으로 하는 디지털 중간 주파수 다운 컨버터를 포함하는 복조기.
- 제 1 항에 있어서, 상기 제2다운 컨버터부는 상기 NCO의 출력과 상기 제1 하향 변환된 IF신호를 혼합하여 제2의 하향 변환된 IF신호를 출력하는 믹서기 및 위상 지연기와, 믹서기 출력의 위상 로테이션을 수행하는 위상 로테이터를 포함하여 이루어진 것을 특징으로 하는 디지털 중간 주파수 다운 컨버터를 포함하는 복조기.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020010006053A KR100655784B1 (ko) | 2001-02-08 | 2001-02-08 | 디지털 중간 주파수 다운 컨버터를 포함하는 복조기 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020010006053A KR100655784B1 (ko) | 2001-02-08 | 2001-02-08 | 디지털 중간 주파수 다운 컨버터를 포함하는 복조기 |
Publications (2)
Publication Number | Publication Date |
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KR20020065952A true KR20020065952A (ko) | 2002-08-14 |
KR100655784B1 KR100655784B1 (ko) | 2006-12-12 |
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KR1020010006053A KR100655784B1 (ko) | 2001-02-08 | 2001-02-08 | 디지털 중간 주파수 다운 컨버터를 포함하는 복조기 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20170088913A (ko) * | 2014-11-21 | 2017-08-02 | 노르딕 세미컨덕터 에이에스에이 | 위상 및 심볼 에지 검파를 통한 am 복조 |
-
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- 2001-02-08 KR KR1020010006053A patent/KR100655784B1/ko active IP Right Grant
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20170088913A (ko) * | 2014-11-21 | 2017-08-02 | 노르딕 세미컨덕터 에이에스에이 | 위상 및 심볼 에지 검파를 통한 am 복조 |
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KR100655784B1 (ko) | 2006-12-12 |
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