KR100927666B1 - 다중 채널 복조기의 디지털 구현 회로 및 방법 - Google Patents

다중 채널 복조기의 디지털 구현 회로 및 방법 Download PDF

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KR100927666B1
KR100927666B1 KR1020047003989A KR20047003989A KR100927666B1 KR 100927666 B1 KR100927666 B1 KR 100927666B1 KR 1020047003989 A KR1020047003989 A KR 1020047003989A KR 20047003989 A KR20047003989 A KR 20047003989A KR 100927666 B1 KR100927666 B1 KR 100927666B1
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channel
digital
signal
channels
analog
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KR1020047003989A
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KR20040044952A (ko
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장웨이민
미스코팀
우드번제레미
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브로드로직 네트워크 테크놀로지스, 인크.
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  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

본 발명은 디지털 다중 채널 복조 회로를 실행하는 방법 및 회로에 관한 것이다(도 2 및 도 6). 더 구체적으로, 본 발명의 실시예는 디지털 다중 채널 복조 회로를 제공한다(250, 650). 복조기는 다중 채널 아날로그 RF 신호를 수신하고 자중 채널 아날로그 RF 신호를 더 낮은 주파수 대역으로 이동시키는 주파수 블록 다운 컨버터를 포함한다(210, 610). ADC(220, 620)는 주파수 블록 다운 컨버터로부터 다중 채널 아날로그 RF 신호를 수신하고 다중 채널 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환한다. 디지털 채널 디멀티플렉서(230, 630)는 ADC로부터 다중 채널 디지털 RF 신호를 수신하고 다중 채널 디지털 RF 신호를 개별 디지털 RF 채널로 디멀티플렉스한다.

Description

다중 채널 복조기의 디지털 구현 회로 및 방법{A DIGITAL IMPLEMENTATION OF MULTI-CHANNEL DEMODULATORS}
본 발명은 일반적으로 광대역 통신, 보다 구체적으로는 복조기 회로를 구현하는 방법 및 회로에 관한 것이다.
VOD(video on demand)와 같은 비디오 서비스 및 가정용 서버 배치가 증가 추세에 있다. 결과적으로 광대역 장치 제품이, 케이블 시스템 상으로 반송되는 디지털 컨텐츠의 다중 동시 채널을 지원할 필요가 점차 증대되고 있다. 여기에는 위성 및 지상 TV 시스템과 같은 다른 시스템도 포함된다. 동시에 특정 가정에서 보여지는 모든 채널을 잠재적으로 복조하는 능력은, 기본적으로 비디오 컨텐츠에 대한 보는 패러다임을, "네트워크 스케줄에 의해 시행되는 것"으로부터 "네트워크에 독립적인 고객에 의해 시행되는 것"으로 변화시킬 수 있다.
도 1은 케이블 및 위성 시스템 내에서 사용되는 형태의 종래의 다중 채널 케이블 및 위성 복조기(100)의 간단한 상위 블록 다이어그램이다. 다중 채널 RF 입력 신호는 전형적으로, 각각 상이한 반송파 주파수로 특징지워지고 채널 상에서 반송되는 원하는 정보에 따라 변조되는, 다수의 RF 채널을 포함한다. 각 채널의 대역폭은 반송파 주파수의 간격보다 좁다. 예를 들어, UHF 대역(300MHz에서 3GHz)에 서의 반송파 주파수는 6MHz 간격으로 배치되어 있을 수도 있다. 수신부 체인(102a, 102b, 102c)이 포함된다. 각 체인은 튜너(110), A/D 컨버터(ADC)(120) 및 디지털 변조기(130)를 포함한다. 디지털 변조기(130)는 순방향 오류 정정(forward error correction; FEC) 회로(명확이 도시되지는 않음)를 포함한다.
각 튜너(110)의 기능은 특정 주파수 대역에 속하는 RF 채널를 선택한다. 각 RF 채널에 대해서는 하나의 튜너가 있다. 튜너에 대한 입력 RF 신호는 많은 또는 모든 RF 채널을 포함한다. 그후 각 튜너는 선택된 RF 채널 주파수를 케이블 시스템을 위한 더 낮은 고정 주파수 통과 대역(pass band), 또는 위성 시스템을 위한 기저 대역(base band)으로 변환한다. 그후 각 ADC(120)는 선택된 RF 신호를 디지타이즈화한다. 그후 각 디지털 복조기(130)는 신호 복조를 수행하고 복구된 디지털 비트를 오류 표시 신호와 함께 출력한다.
각 RF 채널은 하나의 아날로그 튜너 및 아날로그 대역 통과(band pass) 또는 저역 통과(low pass) 필터를 필요로 한다. 이러한 접근에 있어서, 요구되는 RF 채널의 수가 증가함에 따라, 비용, 전력 소비, 및 복잡도가 높아진다는 문제점이 있다.
본 발명은 다운스트림(downstream) 신호와 같은 신호를 복조하는 방법 및 회로를 제공한다. 적어도 몇몇의 실시예들은 저비용, 저전력 소비, 및/또는 저복잡도를 특징으로 하고 있다.
본 발명에 따른 디지털 다중 채널 복조기 회로는 다중 채널 아날로그 RF 신 호를 수신하고 다중 채널 아날로그 RF 신호를 더 낮은 주파수 대역으로 이동시키는 주파수 블록 다운 컨버터(frequency-block down-converter)를 포함한다. ADC는 주파수 블록 다운 컨버터로부터 다중 채널 아날로그 RF 신호를 수신하고 다중 채널 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환한다. 디지털 채널 디멀티플렉서는 ADC로부터 다중 채널 디지털 RF 신호를 수신하고 다중 채널 디지털 RF 신호를 개별 디지털 RF 채널로 디멀티플렉스한다.
다른 실시예로, 개별 RF 채널을 수신하고, 하나 이상의 RF 채널을 선택하는 디지털 선택기, 및 디지털 선택기로부터 하나 이상의 RF 채널을 수신하고, 하나 이상의 RF 채널을 복조하는 다수의 복조기가 있다.
다른 실시예로, 다중 채널 복조에서 사용하는 디지털 튜너가 있다. 디지털 튜너에는 대응하는 개별 RF 채널과 관련된 선택 주파수를 발생시키는 수치 제어 발진기(numeric control oscillator; NCO)가 있다. 복소 승산기(complex multiplier)는 다중 채널 디지털 RF 신호를 수신하고, 다중 채널 디지털 RF 신호를 선택 주파수로 곱하고, 그 결과를 저역 통과 필터로 통과시켜, 대응하는 RF 신호 상에 중첩된 신호를 추출한다.
다른 실시예로, 다중 채널 복조에서 사용하는 다상 채널 디멀티플렉서(polyphase channel demultiplexer)가 있다. 다상 채널 디멀티플렉서에는, 다중 채널 디지털 RF 신호를 수신하고 RF 신호를 동기화하도록 구성된 적어도 하나의 저역 통과 필터가 있다. 또한 다중 채널 디지털 RF 신호를 개별 디지털 RF 채널로 디멀티플렉스하는 이산 푸리에 변환(discrete Fourier transform) 회로 도 있다.
본 발명의 실시예는 전자 및 프로세스 분야에서의 공지 회로 및 프로세스 기술 및 공지 기술의 컨텍스트로 그 목적 및 이익을 달성할 수 있다. 본 발명의 성질, 특징, 및 이점은 명세서, 첨부 도면, 및 청구의 범위를 참조함으로써 더 잘 이해될 수 있을 것이다.
도 1은 케이블 및 위성 시스템에서 사용되는 종래의 다중 채널 및 위성 복조기의 단순화된 상위 블록 다이어그램.
도 2는 본 발명의 실시예에 따른, 전형적인 채널 복조기의 단순화된 상위 블록 다이어그램.
도 3은 본 발명의 실시예에 따른, 디지털 튜너의 단순화된 상위 개략적인 다이어그램.
도 4는 본 발명의 실시예에 따른, 다상 채널 디멀티플렉서의 단순화된 상위 개략적인 다이어그램.
도 5는 본 발명의 실시예에 따른, M×N 디지털 선택기의 단순화된 상위 개략적인 다이어그램.
도 6은 본 발명의 다른 실시예에 따른, 전형적인 다중 채널 복조기의 단순화된 상위 블록 다이어그램.
도 7은 본 발명의 다른 실시예에 따른 전형적인 다중 채널 복조기를 이용하는 시스템의 단순화된 상위 블록 다이어그램.
도 8은 본 발명의 다른 실시예에 따른 전형적인 다중 채널 복조기를 이용하는 시스템의 단순화된 상위 블록 다이어그램.
도 2는 본 발명의 실시예에 따른 전형적인 다중 채널 복조기(200)의 단순화된 상위 블록 다이어그램이다. 주파수 블록 다운 컨버터(210)는 위성 시스템, 지상 TV 시스템, 케이블 시스템 등과 같은 다양한 시스템을 출처로 하는 하나 이상의 다중 채널 아날로그 RF 신호를 수신한다.
본 명세서의 목적상, 다중 채널 RF 신호는 다중 RF 채널을 반송하는 주어진 주파수 대역에서의 RF 신호이다. 수신 RF 신호의 주파수는 매우 낮은 주파수에서 상당히 높은 주파수까지 변화할 수 있다. 게다가, 본 명세서의 컨텍스트에서, RF 신호는 주파수 대역에 포함되는 반송 신호로 특징지워진다. 주어진 RF 채널은 하나 이상의 컨텐츠 채널을 반송하고, 상기 채널은 채널의 반송 주파수 상에 중첩되고 가입자에 의해 액세스 또는 사용되도록 의도된 데이터 스트림이다. 여기에서 사용되는 것처럼 하나의 RF 채널은 하나 이상의 컨텐츠 채널을 반송한다. 따라서 하나의 RF 채널은 다양한 데이터 스트림을 제공할 수 있고, 이 중 어떤 것은 가입자에 의해 선택되어 진다(예를 들면 오디오, 비디오 등). 다른 데이터 스트림은 프로그램 제공자에 의해 이리 프로그램되거나 선택되어질 수도 있다(예를 들면 조건부 액세스 데이터).
다운 컨버터(down converter)(210)는 다중 채널 아날로그 RF 신호를 더 낮은 주파수 대역으로 이동시킨다. 주파수는 단순히 시프트다운(downshift) 즉, 각 RF 채널 및 보호 대역(guard band)의 주파수 대역은 상대적으로 서로 동일하게 남아 있게 되나 모두 동일한 주파수만큼 아래쪽으로 이동하게 된다. 더 정확하게, 참조 신호는 다중 채널 아날로그 RF 신호를 더 낮은 주파수 대역로 곱한다. 그후 더 낮은 주파수 밖의 신호 컴포넌트는 제거된다. 다음 단계에서 신호 처리를 더 잘 할 수 있도록 하기 위하여 주파수가 낮추어진다. 예를 들면, 몇몇 특정 실시예에 있어서, 주파수는 300MHz 이하의 대역으로 이동되어, 한 쌍의 300MHz ADC 또는 단일의 600MHz ADC에 의해 처리될 수 있다. 위성 시스템에 대해서, 단일 ADC가 사용될 수 있지만, 더 엄격한 요구조건(예를 들면, 더 높은 주파수에서는 동기화가 더 어렵다)으로 인하여 전형적으로 적어도 두개의 ADC가 사용된다.
이러한 특정 실시예에 있어서, 다운 컨버터(210)의 일부인 대역 통과 필터(212)는 원하지 않는 채널로부터의 앨리어싱(aliasing)을 감소시킨다. 복조기(200)는 선행 기술에서와 같이 많은 RF 튜너 대신에, 단지 하나의 단일 단계 주파수 블록 다운 컨버터만을 요구하기 때문에, 전체 시스템 비용이 절감된다.
그후 ADC(220)는 다운 컨버트된 다중 채널 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환한다. 이러한 특정 실시예에 있어서, ADC(220)는 n개의 채널을 지닌 전체 신호 대역이 변환될 수 있도록 하는 고속 ADC이다.
그후 디지털 채널 디멀티플렉서(230)는 멀티 채널 디지털 RF 신호를 개별 디지털 RF 채널(C1 ∼ Cn)로 디멀티플렉스한다. 채널 디멀티플렉서(230)의 특정 실행은 특정 애플리케이션 및 요구조건에 의할 것이다. 다른 채널 디멀티플렉서 실시예는 이하에서 더 자세히 설명될 것이다(도 2 및 도 3). 도 2를 계속하여 살펴보면, n×m 디지털 선택기(240)는 디멀티플렉스된 디지털 RF 채널(C1 ∼ Cn)을 수신한 후, 하나 이상의 디지털 RF 채널(C1 ∼ Cn)로부터 하나 이상의 RF 채널(D1 ∼ Dm)을 선택한다. RF 채널(C1 ∼ Cn)은 가입자에 의해 선택되고 사용되는 컨텐츠 채널을 포함한다. 디지털 선택기(240)의 채널 탐색 능력은 RF 튜너를 통한 종래의 아날로그 채널 스위칭보다 훨씬 더 빠르다. 이는 모든 RF 채널을 복조하는 RF 튜너를 이용하는 시스템과 달리, 단지 선택된 채널만이 후에 복조되기 때문이다. 본 발명의 실시예는 더 빠를 뿐만아니라, 단지 선택된 RF 채널만을 복조할 경우, 더 적은 자원이 요구되므로 열을 덜 방산하게 된다.
그후 m개의 선택된 RF 채널은 개별 복조기{250(1), 250(2), ...250(m)}로 유입된다. 복조기의 아키텍쳐(200)는 복조기가 다중 채널 위성, 지상 TV(NTSC, ATSC, DVB-T 등), 및 케이블 다운스트림 신호를 처리할 수 있도록 한다. 몇몇 실시예에 있어서 복조기{250(1...m)}는 그들이 자원을 공유하기 때문에 공유 복조기가 된다. 많은 기능 블록들이 상이한 복조기 사이에서 공유된다. 예를 들면, 이러한 기능 블록에는 수치 제어 발진기(NCO), 타이밍 오류 검출 회로, 반송파 복구 회로가 있을 수 있다. 이러한 복조 사이의 자원 공유로 인하여 전력을 상당한 정도로 절약할 수 있다. 그러므로 본 발명의 이러한 실시예로, 더 많은 RF 채널이 단일 칩에서 복조될 수 있다. 이러한 특정 실시예에 있어서, 복조기{250(1...m)}는 디지털 선택기(240)에 의해 선택된 RF 채널만을 복조한다. 다른 실시예에 있어서, 다른 컨텐츠 채널은 복조될 수 있고 복조되는 특정 컨텐츠 채널은 특정 애플리케이션에 의할 것이다. 복조된 후에, 선택된 RF 채널(D1 ∼ Dm)은 디지털 전송 인터페이스(260)로 유입한다.
도 3은 본 발명의 몇몇 실시예에서, 도 2의 디지털 채널 디멀티플렉서(230)를 실행하도록 사용될 수 있는 디지털 튜너(300)의 단순화된 상위 개략적인 다이어그램이다. 디지털 튜너(300)에는 n개의 수치 제어 발진기(NCO){310(1...n)}, 복소 다중 승산기{320(1...n)}, 및 저역 통과 필터(LPF){330(1...n)}의 뱅크(bank)가 있다. 이러한 요소들 중 하나의 체인을 각 RF 채널을 위해 사용한다. 이러한 요소들의 정확한 수는 디멀티플렉스될 RF 채널의 수에 의한다. 이러한 특정 실시예에 있어서, 저역 통과 필터(330)는 고속 유한 임펄스 응답(finite impulse response; FIR) 필터이다.
동작에 있어서, 디지털 튜너(300)는 도 2의 ADC(220)와 같은 ADC로부터 RF 채널을 수신한 후, 디지털 영역에 있는 RF 채널(C1 ∼ Cn)을 분리한다. ADC로부터의 동일한 다중 채널 RF 신호는 각 승산기에 진입하며, 각 RF 채널은 유일한 주파수를 지니고 있다. 도 3의 모든 체인은 유사한 방법으로 동작하기 때문에, 설명의 편의상, 디지털 튜너(300) 중 단지 하나의 체인만을 설명할 것이다.
수치 제어 발진기{310(1)}는 원하는 RF 채널 또는 "타겟" RF 채널의 특징적인 주파수와 일치하는 주파수 또는 "타겟" 주파수를 발생시킨다. NCO{310(1)}의 출력은 복소 승산기{320(1)}에서 수신된 모든 RF 채널와 곱하여 진다. 다중 채널 RF 신호가 NCO{310(1)}의 출력과 곱하여 질 때, 타겟 RF 신호의 주파수는 원하는 채널로 이동된다. 본 발명의 몇몇 실시예에 있어서, 타겟 RF 채널은 기저 대역으로 이동 즉, DC에 집중된다. LPF{330(1...n)}는 모든 RF 채널을 수신하고 각각 자신의 타겟 RF 채널을 제외한 모든 RF 채널을 제거한다. 그러므로 단지 타겟 RF 채널만이 통과한다. 따라서, 개별 RF 채널은 디지털 튜너(300)를 나오게 된다(즉, 다중 채널 RF 신호가 디멀티플렉스된다). 그후 디지털 튜너 회로(300)는 개별의 RF 채널(C1 ∼ Cn)을 출력하고, 각 RF 채널은 기저 대역에 집중된다.
도 4는 본 발명의 몇몇 실시예에 있어서, 도 2의 디지털 채널 디멀티플렉서(230)를 실행하도록 사용될 수 있는 다상 채널 디멀티플렉서(400)의 단순화된 상위 개략적인 다이어그램이다. 다상 채널 디멀티플렉서(400)에는 저역 통과 필터(LPF){410(1...n)} 및 이산 푸리에 변환 회로(DFT)(420)의 뱅크(bank)가 있다. 각 채널을 위해 하나의 LPF를 사용하고 따라서, LPF의 명확한 수는 디멀티플렉스될 RF 채널의 수에 의한다. 이러한 특정 실시예에 있어서, 저역 통과 필터(410)는 저속 유한 임펄스 응답(FIR) 필터이다. 다상 구조에서는, 각 필터의 계수가, 더 큰 저역 통과 필터의 일부분이기 때문에, 단지 저속 FIR 필터만이 요구된다.
동작에 있어서, 다상 채널 디먹스(demux)(400)는 도 2의 ADC(220)와 같은 ADC로부터 다중 채널 RF 신호를 수신한 후, 디지털 영역에 있는 RF 채널(C1 ∼ Cn)을 분리한다. ADC로부터의 동일한 다중 채널 RF 신호는 다운 샘플 회로(down sample circuit)(430)를 경유하여 각 LPF에 진입한다. 더 상세하게는, 다중 채널 RF 신호가 다운 샘플 회로(430)에서 다운 샘플링된다[즉, 다중 채널 RF 신호가 LPF{410(1...n)}를 거쳐 통과하도록 하기 위해 시간 영역에서 샘플링된다). LPF{410(1...n)}를 거쳐 통과하는 다중 채널 RF 신호는 각 경우에 있어 위상 이동 및 시간 이동되는 경우를 제외하고는 동일한 정보를 포함한다. LPF{410(1...n)}는 단지 위상에서만 차이가 있는 RF 채널들을 시간 영역에서 동기화한다.
DFT(420)는 원래의 RF 반송파 신호로부터 RF 신호를 분리한다. 몇몇 특정 실시예에 있어서, DFT(420)는 상이하게 사이즈된 고속 푸리에 변환(fast Fourier transform; FFT)의 조합으로 실행될 수 있다. DFT(420)의 기능은 도 3의 NCO{310(1...n)}의 기능과 유사하다. 도 3의 디지털 튜너(300)는 각 RF 채널을 유일한 주파수와 관련시키는 반면, 다상 채널 디멀티플렉서(400)는 각 RF 채널을 유일한 위상과 관련시킨다.
따라서, 개별 RF 채널은 다상 디먹스(400)를 나오게 된다(즉, 다중 채널 RF 신호는 디멀티플렉스된다). 그후 다상 디먹스(400)는 개별 RF 채널(C1 ∼ Cn)을 출력하고, 각 RF 채널은 기저 대역에 집중된다.
도 4의 다상 필터 구조는 NCO 또는 복소 승산기를 요구하지 않기 때문에, 칩 상에서 더 적은 영역을 필요로 하게 된다. 게다가, 구성 요소가 더 적기 때문에, 다상 디먹스(400)의 전력 소모를 감소시킨다.
도 5는 본 발명의 몇몇 실시예에 있어서 도 2의 디지털 선택기(240)를 실행 하도록 사용될 수 있는 n×m 디지털 선택기(500)의 단순화된 상위 개략적인 다이어그램이다. 디지털 선택기(500)에는 버스 선택기(510), 하나 이상의 다중 데이터 버스(520), 및 시분할 디멀티플렉서(530)가 있다.
동작에 있어서, 디지털 선택기(500)는 디지털 RF 채널(C1 ∼ Cn)로부터 하나 이상의 RF 채널(D1 ∼ Dm)을 디지털적으로 선택한 후, 이를 상이한 데이터 버스(도시되지 않음)를 통해 적절한 복조기 또는 출력 포트(도시되지 않음)에 보낸다. 버스 클락은 채널 샘플링 비율보다 훨씬 빠르기 때문에, 다중 RF 채널은, 선택된 RF 채널이 데이터 버스에 진입하기 이전에 발생하는 시분할 멀티플렉싱을 이용하여, 각 버스를 이용할 수 있다. 그러므로 각 데이터 버스는 다중 복조기에 데이터를 제공하고, 채널 디멀티플렉서(도시되지 않음)로부터의 각 출력 RF 신호를 선택하여, 임의의 데이터 버스를 사용할 수 있다.
이러한 특정 실시예에 대한 다른 변화, 변경, 및 대안도 가능하다. 예를 들면, 상기에 진술한 것처럼, 각 개별 RF 채널은 하나 이상의 컨텐츠 채널을 가지고 있다. 이러한 RF 채널 중 몇몇을 복조를 위해 선택한다. 복조를 위해 선택된 특정 RF 채널은 특정 애플리케이션에 의한다.
도 6은 본 발명의 다른 실시예에 따른, 전형적인 다중 채널 복조기(600)의 단순화된 상위 블록 다이어그램이다. 복조(600)는 도 2의 복조(200)와 유사하게 동작한다. 이러한 특정 실시예에 있어서, 주파수 블록 다운 컨버터(610)는 다중 채널 아날로그 RF 신호를 수신한다. 이러한 신호는 위성 시스템, 지상 TV 시스템, 케이블 시스템 등과 같은 다양한 시스템을 출처로 한다. 이러한 특정 실시예에 있어서, 신호는 케이블 시스템을 출처로 한다. 따라서, 다중 채널 아날로그 RF 신호는 540-750MHz 사이에 있는 것으로 도시되고 있다. 다른 실시예에 있어서, 신호가 상기 범위 밖에 있을 수 있다. 도시된 것과 같이 수신 RF 신호는 두개의 신호 그룹으로 나뉘어진다(하나는 540-645MHz의 범위, 다른 하나는 645-750MHz의 범위). 각 그룹은 20-130MHz의 더 낮은 주파수 대역으로 다운 컨버트되어, 300MHz ADC(620a, 620b) 각각이 그 그룹들을 처리할 수 있다.
ADC(620a, 620b)는 다중 채널 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환한다. 디멀티플렉서(630)는 다중 채널 디지털 RF 신호를 개별 디지털 RF 채널(C1 ∼ Cn)로 디멀티플렉스한다. 단일 다중 채널 RF 신호는 다중 개별 RF 신호를 가질 수 있다{예를 들면, 다중 채널 RF 신호마다 35개의 RF 채널(C1 ∼ C35)}.정확한 수는 특정 애플리케이션에 의한다. 디지털 선택기(640)는 RF 채널(C1 ∼ Cn)로부터 하나 이상의 RF 채널(D1 ∼ Dm)을 디지털적으로 선택한다. 단일 개별 RF 채널은 다중 개별 컨텐츠 신호를 가질 수 있다(예를 들면, RF 채널마다 18개의 컨텐츠 채널). 정확한 수는 특정 애플리케이션에 의한다. 예를 들면, 도 6에서 35개의 개별 RF 채널(C1 ∼ C35)이 있다. 이러한 RF 채널 중에, 20개의 RF 채널(D1 ∼ D20)이 선택된다. 이러한 20개의 선택된 RF 채널은 복조를 위해 복조기 집합{650(1...20)}에 보내진다.
시스템 애플리케이션
본 발명에 있어서의 실시예를 다양한 시스템에서 사용하여, 고성능 비디오, 오디오 및 데이터 컨텐츠를 위한 통합 VLSI를 제공하는 것과 같이, 홈 엔터테인먼트 및 정보를 위한 믿을 수 있고 비용 및 전력 효율을 도모할 수 있는 솔루션을 제공할 수 있다. 또한 본 발명의 실시예는 종래의 오퍼레이터 인프라스트럭쳐에 영향을 주어, 새로운 홈 네트워킹 아키텍쳐, 새로운 종류의 고객 전자 장치, 및 새로운 서비스를 가능하게 한다. 표준 프로세스 CMOS를 이용한 시스템 솔루션으로 본 발명의 실시예를 이용할 수 있다. 도 7은 본 발명의 실시예에 따른, 다중 채널 복조기(710)를 이용한 시스템(700)의 단순화된 상위 블록 다이어그램이다. 도 7에 도시된 A/D 컨버터는 본 발명을 구현하는 칩 또는 개별 칩 상에 있을 수 있다.
본 발명을 이용한 시스템은 디지털 셋톱 박스, PVR, 가정용 게이트웨이 및 가정용 미디어 센터를 위한 향상된 광대역 프론트 엔드(front end)를 수행할 수 있다. 도 8은 본 발명의 실시예에 따른, 다중 채널 복조기(810)를 이용한 시스템(800)의 단순화된 상위 블록 다이어그램이다. 도 8의 시스템(800)은 셋톱 박스 / PVR / 가정용 미디어 센터이다. 또한, 본 발명을 이용한 시스템은 엔터테인먼트 및 정보 컨텐츠의 가장 폭 넓은 동시 수신을 지원할 수 있고, 케이블 및 위성 서비스에 있어서 2-방향 통신을 위한 광대역 반환 채널을 제공한다.
결론
결론적으로 본 발명의 실시예는 많은 이점을 제공함을 알 수 있다. 주로, 본 발명의 실시예는 다중 다운스트림 튜너 / 복조기 칩셋 및 다중 반송 엔진에 대 한 필요성을 제거하여 상당한 정도로 비용 및 전력 감축을 이룰 수 있고, 10배 이상의 성능 및 용량을 제공할 수 있다. 위성 서비스에 대하여, 본 발명의 실시예를 채용한 시스템은 아날로그 튜너 없이 전체 500MHz 대역을 수신하고 DVB-RCS 반환 채널을 지원할 수 있다. 케이블 서비스에 대하여, 본 발명을 이용한 광대역 수신기는 DOCSIS 반환 채널을 통합할 수 있다. 본 발명의 실시예는, 많은 RF 튜너 대신에, 단지 하나 또는 적은 수의 단일 스테이지 주파수 블록 다운 컨버터를 필요로 하고, 이로 인하여 전체 시스템 비용이 감소한다. 게다가, 본 발명의 실시예는 채널들 사이에 정확한 주파수 공간을 제공하고, 채널들은 상이한 복조기 사이에서 자원을 공유하여 상당한 정도로 전력 절감을 이룰 수 있다. 게다가, 디지털 선택기를 통한 RF 채널 탐색은 RF 튜너를 통한 종래의 아날로그 스위치보다 훨씬 빠르다. 게다가, 위성 및 케이블 시스템 모두에서 상기 아키텍쳐를 이용할 수 있다.
도시 및 설명의 목적으로, 상기에서 본 발명의 특정 실시예를 제시하였다. 명세서 전문을 통해 기술 분야의 당업자들은 상기 발명을 다양한 실시예 및 특정 사용에 적합한 다양한 변경을 통해 가장 잘 이용하고 실행할 수 있을 것이다. 본 명세서를 읽고 이해한 후, 많은 변경, 변화, 대안, 및 이에 상당하는 것들이 본 기술 분야의 당업자에게 명확해질 것이고, 본 발명의 범위 내에서 의도될 수 있다. 알고 있듯이 도 2 내지 도 6의 실행은 단지 예일뿐 청구의 범위를 여기에 한정해서는 안된다. 본 발명에 비추어 기술 분야의 당업자는 많은 다른 변화, 변경, 및 대안을 인식할 수 있을 것이다. 예를 들어, RF 채널은 상이한 주파수 대역에 있을 수 있다. 또한, RF 채널은 인접할 필요가 없다. 또한, 설명된 회로 및 방법은 다 양한 시스템에서 많은 상이한 형태로(즉, 소프트웨어, CMOS와 같은 하드웨어, 또는 양자의 조합으로) 실행될 수 있다. 그러므로, 본 발명은 설명된 특정 실시예에 한하지 않고, 여기에서 개시된 원리 및 신규한 특징들과 일관하여 최광의 범위로 허용되고, 이하 청구항에서 정의된 바와 같이 의도된다.

Claims (42)

  1. 다중 채널 아날로그 RF 신호를 처리하는 디지털 다중 채널 복조기 회로로서,
    상기 아날로그 RF 신호를 수신하고 상기 아날로그 RF 신호를 더 낮은 주파수 대역으로 이동시키도록 구성된 주파수 블록 다운 컨버터;
    상기 주파수 블록 다운 컨버터로부터 상기 아날로그 RF 신호를 수신하고 상기 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환하도록 구성된 아날로그-디지털 컨버터(ADC);
    상기 ADC로부터 상기 디지털 RF 신호를 수신하고 상기 디지털 RF 신호를 개별 디지털 RF 신호로 디멀티플렉스하도록 구성된 디지털 채널 디멀티플렉서;
    개별 디지털 RF 채널을 수신하고, 하나 이상의 상기 개별 디지털 RF 채널을 선택하도록 구성된 선택기; 및
    상기 선택기로부터 상기 하나 이상의 선택된 디지털 RF 채널을 수신하고, 상기 하나 이상의 선택된 디지털 RF 채널을 복조하도록 구성된 하나 이상의 복조기
    를 포함하는 다중 채널 복조기 회로.
  2. 삭제
  3. 제1항에 있어서,
    상기 각 개별 디지털 RF 채널은 가입자에 의해 액세스되거나 사용될 하나 이상의 데이터 스트림을 포함하는 것인 다중 채널 복조기 회로.
  4. 제1항에 있어서,
    상기 하나 이상의 복조기는 상기 선택기에 의해 선택된 RF 채널만을 복조하는 것인 다중 채널 복조기 회로.
  5. 제1항에 있어서,
    상기 하나 이상의 복조기로부터, 상기 선택된 RF 채널을 수신하고 상기 선택된 상기 RF 채널을 출력하도록 구성된 디지털 전송 인터페이스를 더 포함하는 다중 채널 복조기 회로.
  6. 제1항에 있어서,
    원하지 않는 신호로부터의 앨리어싱(aliasing)을 감소시키는 대역 통과 필터를 더 포함하는 다중 채널 복조기 회로.
  7. 제1항에 있어서,
    상기 ADC는 고속 ADC인 것인 다중 채널 복조기 회로.
  8. 제1항에 있어서,
    상기 ADC는 상기 다중 채널 아날로그 RF 신호를 포함하는 전체 신호 대역을 변환하는 것인 다중 채널 복조기 회로.
  9. 제1항에 있어서,
    상기 하나 이상의 복조기는 자원을 공유하는 것인 다중 채널 복조기 회로.
  10. 제1항에 있어서,
    상기 디지털 채널 디멀티플렉서는 디지털 튜너를 포함하는 것인 다중 채널 복조기 회로.
  11. 제10항에 있어서,
    상기 디지털 튜너는,
    대응하는 RF 채널과 관련된 선택 주파수를 발생시키도록 구성된 수치 제어 발진기(NCO)와;
    상기 디지털 RF 신호를 수신하고 상기 디지털 RF 신호를 상기 선택 주파수로 곱하도록 구성된 복소 승산기와;
    상기 디지털 RF 신호를 수신하고, 상기 대응하는 RF 채널을 통과시키도록 구성된 저역 통과 필터(LPF)를 포함하는 것인 다중 채널 복조기 회로.
  12. 제11항에 있어서,
    상기 LPF는 고속 유한 임펄스 응답(FIR) 필터인 것인 다중 채널 복조기 회로.
  13. 제1항에 있어서,
    상기 디지털 다중 채널 복조기 회로는 위성 시스템, 지상 TV 시스템, 및 케이블 시스템 중 적어도 하나에서 다운스트림 신호를 처리하는 것인 다중 채널 복조기 회로.
  14. 메모리와 연동하여 제1항의 회로를 이용하는 시스템.
  15. 프로세서와 연동하여 제1항의 회로를 이용하는 시스템.
  16. 제1항에 있어서,
    상기 디지털 채널 디멀티플렉서는 다상 채널 디멀티플렉서인 것인 다중 채널 복조기 회로.
  17. 제16항에 있어서,
    상기 다상 채널 디멀티플렉서는,
    상기 다중 채널 디지털 RF 신호를 수신하고 RF 채널을 동기화하도록 구성된 하나 이상의 저역 통과 필터(LPF)와;
    상기 디지털 RF 신호를 수신하고 상기 디지털 RF 신호를 개별 RF 채널로 디 멀티플렉스하도록 구성된 이산 푸리에 변환 회로(DFT)를 포함하는 것인 다중 채널 복조기 회로.
  18. 제17항에 있어서,
    상기 DFT는 상이한 고속 푸리에 변환의 조합인 것인 다중 채널 복조기 회로.
  19. 제17항에 있어서,
    상기 다상 채널 디멀티플렉서는 적어도 두개의 상기 LPF를 포함하고, 상기 각 LPF의 계수는 더 큰 저역 통과 필터의 일부분인 것인 다중 채널 복조기 회로.
  20. 제17항에 있어서,
    상기 LPF는 저속 유한 임펄스 응답(FIR) 필터인 것인 다중 채널 복조기 회로.
  21. 삭제
  22. 삭제
  23. 삭제
  24. 삭제
  25. 삭제
  26. 삭제
  27. 삭제
  28. 디지털 다중 채널 RF 신호를 다수의 개별 컨텐츠 채널로 디멀티플렉스하는 방법으로서,
    다중 채널 아날로그 RF 신호를 더 낮은 주파수 대역으로 다운 변환하는 단계;
    상기 다중 채널 아날로그 RF 신호를 다중 채널 디지털 RF 신호로 변환하는 단계;
    상기 다중 채널 디지털 RF 신호를 개별 디지털 RF 채널로 디멀티플렉스하는 단계; 및
    상기 디지털 RF 채널 중 적어도 하나로부터, 하나 이상의 선택된 RF 채널을 선택하는 단계를 포함하고, 상기 각 선택된 RF 채널은 가입자에 의해 액세스되거나 사용될 하나 이상의 컨텐츠 채널을 포함하는 RF 채널인 것인 디멀티플렉스 방법.
  29. 제28항에 있어서,
    다수의 상기 다중 채널 아날로그 RF 신호를 수신하는 단계를 더 포함하는 디멀티플렉스 방법.
  30. 삭제
  31. 제28항에 있어서,
    상기 하나 이상의 선택된 RF 채널을 복조하는 단계를 더 포함하는 디멀티플렉스 방법.
  32. 제31항에 있어서,
    단지 상기 하나 이상의 선택된 RF 채널만을 복조하는 단계를 더 포함하는 디멀티플렉스 방법.
  33. 제29항에 있어서,
    다수의 상기 다중 채널 아날로그 RF 신호는 위성 시스템, 지상 TV 시스템, 및 케이블 시스템 중 적어도 하나로부터 나오는 것인 디멀티플렉스 방법.
  34. 제28항에 있어서,
    상기 디멀티플렉스하는 단계는,
    다수의 선택 주파수를 제공하는 단계와;
    적어도 하나의 다중 채널 RF 신호를 상기 각 선택 주파수로 곱하여 개별 RF 채널을 얻는 단계를 포함하고, 상기 각 선택 주파수는 대응하는 개별 RF 신호와 관련되는 것인 디멀티플렉스 방법.
  35. 제34항에 있어서,
    상기 곱셈은 복소 승산기로 달성되는 것인 디멀티플렉스 방법.
  36. 제34항에 있어서,
    타겟 RF 채널을 기저 대역으로 이동시키는 단계를 더 포함하는 디멀티플렉스 방법.
  37. 제34항에 있어서,
    원하지 않는 RF 채널을 필터링하고 단지 타겟 RF 채널만을 통과시키는 단계를 더 포함하는 디멀티플렉스 방법.
  38. 제37항에 있어서,
    상기 필터링은 저역 통과 필터(LPF)로 달성되는 것인 디멀티플렉스 방법.
  39. 제38항에 있어서,
    상기 LPF는 유한 임펄스 응답(FIR) 필터인 것인 디멀티플렉스 방법.
  40. 제39항에 있어서,
    상기 FIR 필터는 고속 필터인 것인 디멀티플렉스 방법.
  41. 제34항에 있어서,
    상기 선택 주파수는 수치 제어 발진기에 의해 발생되는 것인 디멀티플렉스 방법.
  42. 제28항에 있어서,
    상기 디멀티플렉스하는 단계는,
    저역 통과 필터(LPF)를 이용하여 다중 채널 RF 신호 샘플을 동기화하고 RF 채널의 주파수를 이동시키는 단계를 더 포함하는 디멀티플렉스 방법.
KR1020047003989A 2001-09-18 2002-09-18 다중 채널 복조기의 디지털 구현 회로 및 방법 KR100927666B1 (ko)

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US09/956,479 US6704372B2 (en) 2001-09-18 2001-09-18 Digital implementation of multi-channel demodulators
US09/956,479 2001-09-18
PCT/US2002/029807 WO2003026242A1 (en) 2001-09-18 2002-09-18 A digital implementation of multi-channel demodulators

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KR20040044952A KR20040044952A (ko) 2004-05-31
KR100927666B1 true KR100927666B1 (ko) 2009-11-25

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EP1436958A4 (en) 2006-08-30
US6704372B2 (en) 2004-03-09
KR20040044952A (ko) 2004-05-31
US20030056221A1 (en) 2003-03-20
ATE462255T1 (de) 2010-04-15
US7394871B2 (en) 2008-07-01
EP1436958B1 (en) 2010-03-24
CN100466643C (zh) 2009-03-04
US20040218700A1 (en) 2004-11-04
EP1436958A1 (en) 2004-07-14
JP4063764B2 (ja) 2008-03-19
DE60235766D1 (de) 2010-05-06
CN1589556A (zh) 2005-03-02
WO2003026242A1 (en) 2003-03-27
JP2005504468A (ja) 2005-02-10

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