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KR880700582A - 불완전 전송 매체용 앙상블 모뎀 구조체 - Google Patents

불완전 전송 매체용 앙상블 모뎀 구조체

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Publication number
KR880700582A
KR880700582A KR870700046A KR870700046A KR880700582A KR 880700582 A KR880700582 A KR 880700582A KR 870700046 A KR870700046 A KR 870700046A KR 870700046 A KR870700046 A KR 870700046A KR 880700582 A KR880700582 A KR 880700582A
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South Korea
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modem
data
carrier
power
determining
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KR870700046A
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English (en)
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더크 휴즈 하토그스
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자네트 엘.부르웰
텔리빗 코오포레이숀
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Publication of KR880700582A publication Critical patent/KR880700582A/ko

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/206—Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Hydrogenated Pyridines (AREA)
  • Telephonic Communication Services (AREA)

Abstract

내용 없음

Description

불완전 전송 매체용 앙상블 모뎀 구조체
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제 3 도는 본 발명의 실시예에 대한 블록도.

Claims (17)

  1. 전화선에 데이타를 전송시키기 위해 반송 주파수 앙상블에서 데이타 성분을 인코드하는 타잎의 고속 모뎀에서, 반송 주파수에 데이타와 전력을 할당하는 방법은 앙상블내 모든 반송 주파수에 대해 등가 잡음 성분을 결정하는 단계, 각 반송파상의 데이타 성부늬 콤플렉서티를 n(0과 N 사이의 정수) 정보단위에서 n+1 정보 단위까지 증가시키기 위해 한계 요구 전력을 결정하는 단계, 전력 증가순으로 앙상블 내 모든 반송파의 한계 전력을 정돈 하는 단계, 전력증가순으로 정돈된 한계 전력에 유능 전력을 할당하는 단계, 유능 전력이 소모되는 시점에서 MPmax 값을 결정하는 단계 및 각 반송 주파수에 전력과 데이타를 할당하되, 상기 전력을 상기 반송파에 대한 MPmax 와 같거나 작은 한계 전력들의 모든 합과 동일하게 할당하고, 상기 데이타수를 상기 반송파에 대한 MPmax 와 같거나 작은 한계 전력수와 동일하게 할당하는 단계를 구비하는 것을 특징으로 하는 방법.
  2. 제 1 항에 있어서, 상기 한계 전력의 정돈 단계는 한계 전력 레벨들에 대한 테이블을 제공하는 단계와 복잡한 계산을 간소화 하기 위해, 결정된 각각의 한계 전력 레벨값을 한계 전력 레벨 테이블 값들중 한값으로 반올림하는 단계를 구비하는 것을 특징으로 하는 방법.
  3. 제 2 항에 있어서, 등가 잡음 결정 단계는 전화선에 의해 상호 접속된 A 및 B 모뎀을 제공하는 단계, 상기 A 및 B 모뎀간에 통신 링크를 설정하는 단계, 상기 A 및 B 모뎀에서 전송시간이 아닌동안 전화선 잡음 데이타를 어큐뮬레이트 하는 단계, 적어도 반송 주파수의 제 1 앙상블을 A 모뎀에서 B 모뎀으로 전송하는 단계(여기서, 각 반송파의 진폭은 기설정된 값을 갖는다), 상기 B 모뎀에서 상기 제 1 앙상블을 수신하는 단계, 상기 B 모뎀에서 수신된 각 반송파의 진폭을 측정하는 단계, 각 반송 주파수에서의 신호 손실을 dB 로 결정하기 위해 상기 B 모뎀에서 측정된 진폭을 상기 기설정된 진폭과 비교하는 단계, 각 반송 주파수에서의 잡음 성분값을 dB 로 결정하는 단계 및 등가 잡음을 결정하기 위해, 각 반송 주파수에서의 신호 손실과 잡음 성분을 가산하는 단계를 구비하는 것을 특징으로 하는 방법.
  4. 디지탈 입력 데이타 스트림을 수신하고 상기 디지탈 입력 데이타를 저장하기 위한 수단, 상기 디지탈 입력 데이타를 인코드하기 위해 피변조 반송파 앙상블을 생성하는 수단(여기서, 각 반송파는 반송파상에서 인코드된 가변 콤플렉서티의 데이타 성분을 갖는다), 각 반송파에 대해 VF 전화선의 신호 손실과 잡음 손실을 측정하는 수단및, 측정된 신호 손실과 잡음 레벨을 보상하기 위해, 각 반송파상에서 인코드된 데이타성분의 콤플렉서티와 각 반송파에 할당된 전력량을 가변시키는 단계를 구비하는 것을 특징으로 하는 VF 전화선에 신호를 전송하는 고속 모뎀.
  5. 디지탈 전자 프로세서, 디지탈 전자 메모리, 상기 프로세서와 메모리를 결합시키는 버스 수단을 구비하고, 상기 앙상블에서 각 반송 주파수에 대한 등가 잡음 성분을 결정하기 위해 각 반송파상에서 데이타 성분의 콤플렉서티를 n (0과 N 사이의 정수) 정보 단위에서 n+1 정도 단위로 증가시키도록 한계 요구 전력을 결정하기 위해 전력 증가순으로 앙상블내 모든 반송파들의 한계 전력을 정돈하기 위해 전력 증가순으로 정돈된 한계 전력에 유능 전력을 할당하기 위해 유능 전력이 소모되는 시점에서 MPmax 값을 결정하기 위해 그리고 각 반송 주파수에 전력과 데이타를 할당하되 상기 전력을 상기 반송파에 대한 MPmax와 같거나 작은 한계 전력들의 모든 합과 동일하게 할당하고, 상기 데이타수를 상기 반송파에 대한 MPmax와 같거나 작은 한계 전력수와 동일하게 할당하기 위해 상기 디지탈 전자 프로세서에 결합된 수단을 구비하는 것을 특징으로 하여 개별 주파수를 갖는 반송파 앙상블상에서 데이타 성분을 인코드하는 고속 모뎀.
  6. VF 전화선의 반송 주파수의 QAM 앙상블 형태로 데이타를 전송하기 위해, 데이타를 송신하기 전에 시스템 파라미터의 크기를 측정하는 타잎의 고속 모뎀에서 데이타가 수신되는 동안 상기 시스템 파라미터 크기의 일탈을 트랙킹 하는 방법은 다수의 반송 주파수에 대한 QAM 별자리를 생성하는 단계, 상기 별자리 포인트들중 하나가 중심에 위치하는 제 1 영역을 여러개 구비하는 복조 템플리트를 반송 주파수들중 하나에 대해 구성하는 단계, 제 1 영역내에 제 1 및 제 2 트랙킹 영역 세트를 형성하는 단계, 상기 제 1 및 제 2 트랙킹 영역세트 내에 위치한 복조 포인트를 얻기 위해 상기 반송파 앙상블을 복조하는 단계, 상기 제 1 트랙킹 영역에 위치한 포인트 수와 제 2 트렉킹 영역에 위치한 포인트수를 계수하는 단계, 에러 특성을 구성하기 위해, 상기 제 1 트랙킹 영역에 위치한 카운트수와 제 2 트랙킹 영역에 위치한 카운트와의 차를 산출하는 단계 및 데이타를 수신하는 동안 상기 에러 특성을 이용해서 상기 신호 파라미터 크기를 조절하는 단계를 구비하는 것을 특징으로 하는 방법.
  7. 제 6 항에 있어서, 복조 템플리트를 구성하는 단계는 상기 제 1 영역을 상기 별자리 포인트가 중심에 위치하는 장방형으로 한정하는 단계인 것을 특징으로 하는 방법.
  8. 제 7 항에 있어서, 상기 트랙킹 영역을 형성하는 단계는 상기 장방형 영역을 4개로 분할하는 단계와 상기 트랙킹 영역을 대칭적으로 배치될 1/4 영역으로 선택하는 단계를 구비하는 것을 특징으로 하는 방법.
  9. 전송될 데이타를 저장하기 위한 입력 버퍼를 각각 가지고 전송 링크에 의해 결합된 두 모뎀(A,B)을 포함한 통신 시스템에서, 상기 A 모뎀과 B 모뎀간의 통신 링크에 대한 제어 할당 방법은 전송 링크를 A 모뎀에 할당하는 단계, A 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 결정하는 단계, A 모뎀의 입력 버퍼에 저장된 데이타를 볼륨을 송신하는 데 필요한 데이타를 팩킷수(N)를 결정하는 단계, 전송된 최소 팩킷수가 IA이고 최대 팩킷수가 NA가 되도록 데이타 팩킷(L)을 A 모뎀에서 B 모뎀으로 전송하는 단계(여기서, K 가 IA보다 작으면 L=IA이고, K 가 IA보다 크거나 같으면 L=K 이고, K 가 IA보다 크면 L=NA이다), B 모뎀에 전송 링크 제어를 할당하는 단계, B 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 결정하는 단계, B 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 전송하는 데 필요한 데이타 팩킷수(J)를 결정하는 단계, 전송된 최소 팩킷수가 IB이고 최대 팩킷수가 NB가 되도록 데이타 팩킷(M)을 B 모뎀에서 A 모뎀으로 전송하는 단계(여기서, J 가 IB보다 작으면 M=IB이고, J 가 IB보다 크거나 같으면 M=J이고, J 가 IB보다 크면 M=NB이다)를 구비하고, 여기서, 모뎀들(A,B) 간의 제어 할당은 모뎀들(A,B)의 입력 버퍼에 저장된 데이타 볼륨에 의존되는 것을 특징으로 하는 방법.
  10. 전화선에 데이타를 전송시키기 위해 반송 주파수 앙상블상에서 데이타 성분을 인코드하는 타잎의 고속모뎀에 있어, 반송 주파수에 데이타와 전력을 할당하는 시스템은 앙상블의 모든 반송 주파수에 대해 등가 잡음 성분을 결정하는 수단, 각 반송파상의 데이타 성분 콤플렉서티를 n (0과 N 사이의 정수) 정보 단위에서 n+1 정보 단위로 증가시키기 위해 한계 요구 전력을 결정하는 수단, 전력 증가순으로 앙상블내 모든 반송파의 한계 전력을 정돈하는 수단, 전력 증가순으로 정돈된 한계 전력에 유능 전력을 할당하는 수단, 유능 전력이 소모되는 시점에서 MPmax 값을 결정하는 수단 및 각 반송 주파수에 전력과 데이타를 할당하되, 상기 전력을 상기 반송파에 대한 MPmax 와 같거나 작은 한계 전력들의 모든 합과 동일하게 할당하고, 상기 데이타수를 상기 반송파에 대한 MPmax 와 같거나 작은 한계 전력수와 동일하게 할당하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  11. 제10항에 있어서, 상기 한계 전력을 정돈하는 수단은 한계 전력 레벨에 대한 테이블을 제공하는 수단과 복잡한 계산을 간소화 하기 위해, 결정된 각각의 한계 전력 레벨값을 한계 전력 레벨 테이블 값들중 한 값으로 반올림하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  12. 제11항에 있어서, A 모뎀과 B 모뎀은 전화선에 의해 접속되고, 상기 등가 잡음 결정 수단은 A 모뎀과 B 모뎀간에 통신 링크를 설정하는 수단, A 모뎀과 B 모뎀에서 전송 시간이 아닌 동안 전화선 잡음 데이타를 어큐뮬레이트 하는 수단, 적어도 반송 주파수의 제 1 앙상블을 A 모뎀에서 B 모뎀으로 전송하는 수단(여기서, 각 반송파의 진폭은 기설정된 값을 갖는다), 상기 B 모뎀에서 상기 제1 앙상블을 수신하는 수단, 상기 B 모뎀에서 수신된 각 반송파의 진폭을 측정하는 수단, 각 반송 주파수에서의 신호 손실을 결정하기 위해 상기 모뎀에서 측정된 진폭을 상기 기설정된 진폭과 비교하는 수단, 각 반송 주파수에서 잡음 성분값을 dB 로 결정하는 수단 및 등가 잡음을 결정하기 위해, 각 반송 주파수에서 신호 손실과 잡음 성분을 가산하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  13. VF 전화선에 반송 주파수 QAM 앙상블 형태로 데이타를 전송하기 위해 데이타를 송신하기 전에 시스템 파라미터의 크기를 측정하는 타잎의 고속 모뎀에서 데이타가 수신되는 동안 상기 시스템 파라미터 크기의 일탈을 트랙킹하는 시스템은 다수의 반송파 주파수에 대한 QAM 별자리를 생성하는 수단, 상기 별자리 포인트중 하나가 중심에 위치하는 제 1 영역을 여러개 구비하는 복조 템플리트를 반송 주파수들중 하나에 대해 구성하는 수단, 제 1 영역내에 제 1 및 제 2 트랙킹 영역 세트를 형성하는 수단, 상기 제 1 및 제 2 트랙킹 영역 세트 내에 위치한 복조 포인트를 얻기 위해 상기 반송파 앙상블을 복조하는 수단, 상기 제 1 트랙킹 영역에 위치한 포인트 수와 제 2 트랙킹 영역에 위치한 포인트수를 계수하는 수단, 에러 특성을 구성하기 위해, 상기 제 1 트랙킹 영역에 위치한 카운트수와 제 2 트랙킹 영역에 위치한 카운트와의 차를 산출하는 수단 및 상기 에러 특성을 이용해서 데이타를 수신하는 동안 상기 신호 파라미터 크기를 조절하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  14. 제13항에 있어서, 상기 복조 템플리트를 구성하는 수단은 상기 제 1 영역을 상기 별자리 포인트가 그 중심에 위치하는 장방향으로 한정하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  15. 제14항에 있어서, 상기 크랙킹 영역을 형성하는 수단은 상기 장방향 영역을 4개로 분할하는 수단과, 상기 트랙킹 영역을 대칭적으로 배치될 1/4 영역으로 선택하는 수단을 구비하는 것을 특징으로 하는 고속 모뎀.
  16. 전송될 데이타를 저장하기 위한 입력 버퍼를 각각 가지고 전송 링크에 의해 결합된 두 모뎀(A,B)을 포함한 통신 시스템에서, 상기 A 모뎀과 B 모뎀간의 통신 링크에 대한 제어를 할당하는 시스템은 전송 링크를 A 모뎀에 할당하는 수단, A 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 송신하는 데 필요한 데이타 팩킷수(N)을 결정하는 수단, 전송된 최소 팩킷수가 IA이고 최대 팩킷수가 NA가 되도록 데이타 팩킷(L)을 A 모뎀에서 B모뎀으로 전송하는 수단(여기서 K가 IA보다 작으면 L=IA이고, K가 IA보다 크거나 같지만 NA보다는 작으면 L=K 이고, K가 NA보다 크면 L=NA이다), B 모뎀에 전송 링크 제어를 할당하는 수단, B 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 결정하는 수단, B 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 전송하는 데 필요한 데이타 팩킷수(J)를 결정하는 수단, 전송된 최소 팩킷수가 IB이고 최대 팩킷수가 NB가 되도록 데이타 팩킷(M)을 B 모뎀에서 A 모뎀으로 전송하는 수단(여기서, J가 IB보다 작으면 M=IB이고, J가 IB보다 크거나 같지만 NB보다는 작으면, M=J, J가 NB보다 크면 L=NB이다)을 구비하고, 여기서, 모뎀들(A,B)간의 제어할당은 모뎀들(A,B)의 입력 버퍼에 저장된 데이타 볼륨에 의존되는 것을 특징으로 하는 통신 시스템.
  17. 반송 주파수 앙상블상에 데이타 성분을 인코드하는 타잎으로서 전송될 데이타를 저장하는 입력 버퍼를 각각 가지고 통신 링크에 의해 결합된 두 모뎀(A,B)을 포함한 고속 모뎀 통신 시스템에서 반송 주파수에 전력과 데이타를 효율적으로 할당하기 위해, 주파수 종속 위상 지연(여기서, 평가된 최대 위상 지연은 TPH이다)을 보상하기 위해, 심볼의 상호 간섭을 방지 하기 위해, A 모뎀과 B 모뎀간의 전송 링크 제어를 할당하기 위해, 샘플 주파수의 역수와 동일한 소정의 샘플 오프셋 시간을 갖는 샘플 주기를 개시하기 위해, 상기 모뎀들을 동작시키는 방법은 모든 반송파 주파수 앙상블에서 등가 잡음 성분을 결정하는 단계, 각 반송파상에서 데이타 성분 콤플렉서티를 n (0과 N 사이의 정수) 정보 단위에서 n+1 정보 단위로 증가시키기 위해 요구 한계 전력을 결정하는 단계, 전력 증가순으로 앙상블내 모든 반송파의 한계 전력을 정돈하는 단계, 전력 증가순으로 유능 전력을 정돈된 한계 전력에 할당하는 단계, 유능 전력이 소모되는 시점에서 MPmax값을 결정하는 단계, 각 반송 주파수에 전력과 데이타를 할당하되, 상기 전력을 상기 반송파에 대한 MPmax와 같거나 작은 한계 전력들의 모든 합과 동일하게 할당하고, 상기 데이타수를 상기 반송파에 대한 MPmax와 같거나 작은 한계 전력수와 동일하게 할당하는 단계, 상기 반송 주파수들중 한 반송 주파수에서 인코드된 심볼을 전송하는 단계(상기 심볼은 기설정된 시간 Ts이다),
    전송 보호 파형 구간(TE+TPH)을 형성하기 위해 상기 심볼의 제1구간(TPH)을 재전송하는 단계, A 모뎀에 전송 링크의 제어를 할당하는 단계, A 모뎀의 입력 버퍼에 기억된 데이타 볼륨을 결정하는 단계, A 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 전송하는 데 필요한 팩킷수 (K)를 결정하는 단계, 전송된 최소 팩킷수가 IA가 되고 최대 팩킷수가 NA가 되도록 데이타 팩킷수(L)을 A 모뎀에서 B 모뎀으로 전송하는 단계(여기서, K가 IA보다 작으면 L=IA이고, K가 IA보다 크거나 같으면 L=K 이고, K가 NA보다 크면 L=NA이다), B 모뎀에 전송 링크 제어를 할당하는 단계, B 모뎀의 입력 버퍼의 데이타 볼륨을 결정하는 단계, B 모뎀의 입력 버퍼에 저장된 데이타 볼륨을 전송시키는 데 필요한 데이타 팩킷수(J)를 결정하는 단계, 전송된 최소 팩킷수가 IB이고, 최대 팩킷수가 NA가 되도록 데이타 팩킷수(M)를 B 모뎀에서 A 모뎀으로 전송시키는 단계(여기서, J가 IB보다 작으면 M=IB이고, J가 IB보다 크거나 같으면 M=J 이고, J가 NB보다 크면 L=NB이다)를 구비하여 A 모뎀과 B 모뎀간의 제어할당이 두 모뎀(A,B)의 입력 버퍼에 저장된 데이타 볼륨에 좌우되고, A 모뎀에서 제1 및 제2주파수 성분들(f1,f2)을 포함한 아날로그 파형을 발생시키는 단계, 시간(TA)에서 상기 파형을 A 모뎀에서 B 모뎀으로 전송시키는 단계, 시간(TA)에서 위상차가 0°와 동일해지도록 상기 제1 및 제2주파수 성분을 조절하는 단계, 상기 파형이 B 모뎀에 도착하는 평가된 시간(Test)을 결정하기 위해 B 모뎀에서 주파수(f1)의 에너지를 결정하는 단계, 시간(Test)에서 B 모뎀의 상기 제1및 제2주파수 성분간의 위상차를 결정하는 단계, 상기 제1및 제2반송파간의 위상차를 0에서 상기 위상차로 가변시키는 데 필요한 샘플 오프셋 시간(N1)수를 계산하는 단계 및 정확한 타이밍 기준 시간(T0)를 얻기 위해 샘플간격(N1) 만큼 시간(Test)를 가변시키는 단계를 구비한 것을 특징으로 하는 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR870700046A 1985-05-20 1986-05-05 불완전 전송 매체용 앙상블 모뎀 구조체 KR880700582A (ko)

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