GB1478709A - Synchronising a digital data receiver - Google Patents

Synchronising a digital data receiver

Info

Publication number
GB1478709A
GB1478709A GB4411974A GB4411974A GB1478709A GB 1478709 A GB1478709 A GB 1478709A GB 4411974 A GB4411974 A GB 4411974A GB 4411974 A GB4411974 A GB 4411974A GB 1478709 A GB1478709 A GB 1478709A
Authority
GB
United Kingdom
Prior art keywords
amplitude
delay
samples
signals
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4411974A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1478709A publication Critical patent/GB1478709A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
    • H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/0062—Detection of the synchronisation error by features other than the received signal transition detection of error based on data decision error, e.g. Mueller type detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1478709 Data receiver synchronization; telegraphy INTERNATIONAL BUSINESS MACHINES CORP 11 Oct 1974 [6 Nov 1973] 44119/74 Headings H4R and H4P In a digital data receiver for signals from a channel producing intersymbol interference the synchronization of the receiver is controlled in response to an error signal derived by correlation of received unequalized signals and information derived from the received equalized signals. As described the transmission mode is multi-level differential phase modulation in which the information is transmitted as amplitude p and phase # of the transmitted signal. The received signal is split into quadrature related component x; and #x i and the components fed to respective transversal equalizers 8 and 9, and also to respective delay circuits 10 and 12. The equalizers are preferably of the type of Specification 1,459,465, having a total delay length 2NT with a main tap at NT. Delay circuits 10 and 12 have a delay 0 = (NT-t) and delay circuits 11 and 12 have delays 2t to provide samples at the points P 1 and P 2 , P 3 and P 4 which are equally spaced Œt about the nominal main tap delay of the transversal equalizer, which should correspond to the maximum pulse amplitude at the equalizer sampling instant. The amplitude of the equalized pulse at the sampling points Œt about the main tap sampling point is determined by correlation of the samples at P 1 , P 2 , P 3 , and P 4 with the values cos #‹/P‹ and sin #‹/P‹ determined from the signal at the output of the equalizer 8, 9. Fig. 2 shows the multipliers 14 to 17 combining circuits 18, 21, integrators 19, 22, squarers 20, 22 and combiner 24 used in the derivation of the pulse amplitude d 1 relevant to the samples P 1 and P 3 , i.e. time (T-t). A similar circuit (not shown) derives the amplitude d 2 relevant to the samples P 2 and P 4 i.e. time (T + t) The difference between d 1 and d 2 is determined in 25 and used to modify the contents of a counter 27, via calibrating unit 26, to alter the phase of the clock signal used to sample the input signals x i ‹ and #x i .
GB4411974A 1973-11-06 1974-10-11 Synchronising a digital data receiver Expired GB1478709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7340556A FR2250447A5 (en) 1973-11-06 1973-11-06

Publications (1)

Publication Number Publication Date
GB1478709A true GB1478709A (en) 1977-07-06

Family

ID=9127747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4411974A Expired GB1478709A (en) 1973-11-06 1974-10-11 Synchronising a digital data receiver

Country Status (4)

Country Link
JP (1) JPS584506B2 (en)
DE (1) DE2443870A1 (en)
FR (1) FR2250447A5 (en)
GB (1) GB1478709A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141194A2 (en) * 1983-09-17 1985-05-15 Alcatel N.V. Circuit arrangement for frame and phase synchronisation of a sampling clock at the receiving end
US4539689A (en) * 1978-04-26 1985-09-03 Racal Data Communications, Inc. Fast learn digital adaptive equalizer
GB2373421A (en) * 2001-03-16 2002-09-18 Cambridge Broadband Ltd Wireless communication system with reduced inter-symbol interference

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4263671A (en) * 1978-10-19 1981-04-21 Racal-Milgo, Inc. Sampling clock correction circuit
JPS63117805A (en) * 1986-11-05 1988-05-21 Mitsui Eng & Shipbuild Co Ltd Three-dimensional automatic warehouse
JPS63117806A (en) * 1986-11-05 1988-05-21 Mitsui Eng & Shipbuild Co Ltd Transferring device for three-dimensional automatic warehouse
US4912726A (en) * 1987-01-12 1990-03-27 Fujitsu Limited Decision timing control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539689A (en) * 1978-04-26 1985-09-03 Racal Data Communications, Inc. Fast learn digital adaptive equalizer
EP0141194A2 (en) * 1983-09-17 1985-05-15 Alcatel N.V. Circuit arrangement for frame and phase synchronisation of a sampling clock at the receiving end
EP0141194A3 (en) * 1983-09-17 1987-11-04 Alcatel N.V. Circuit arrangement for frame and phase synchronisation of a sampling clock at the receiving end
GB2373421A (en) * 2001-03-16 2002-09-18 Cambridge Broadband Ltd Wireless communication system with reduced inter-symbol interference
GB2373421B (en) * 2001-03-16 2004-04-14 Cambridge Broadband Ltd Wireless communication system

Also Published As

Publication number Publication date
FR2250447A5 (en) 1975-05-30
DE2443870A1 (en) 1975-05-15
JPS5081004A (en) 1975-07-01
JPS584506B2 (en) 1983-01-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee