TW345791B - Multimode digital modem a modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. - Google Patents

Multimode digital modem a modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided.

Info

Publication number
TW345791B
TW345791B TW086110289A TW86110289A TW345791B TW 345791 B TW345791 B TW 345791B TW 086110289 A TW086110289 A TW 086110289A TW 86110289 A TW86110289 A TW 86110289A TW 345791 B TW345791 B TW 345791B
Authority
TW
Taiwan
Prior art keywords
data
modem
band
frequency domain
voice
Prior art date
Application number
TW086110289A
Other languages
Chinese (zh)
Original Assignee
Texas Instruments Inc
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
Priority claimed from US08/667,267 external-priority patent/US6055268A/en
Priority claimed from US08/686,801 external-priority patent/US6002722A/en
Application filed by Texas Instruments Inc filed Critical Texas Instruments Inc
Application granted granted Critical
Publication of TW345791B publication Critical patent/TW345791B/en

Links

Classifications

    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • 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
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4919—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes
    • H04L25/4921—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes using quadrature encoding, e.g. carrierless amplitude-phase coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • 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
    • H04L5/1438—Negotiation of transmission parameters prior to communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • 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
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • 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
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Telephonic Communication Services (AREA)

Abstract

A method for generating a digital data frame for transmission in a channel, which comprises: (a) providing a set of frequency domain data; (b) dot-by-dot multiplying the frequency domain data with a set of filter frequency domain coefficients for compensating the channel thereby obtaining a set of frequency domain products; (c) converting the frequency domain products into a set of time domain filtered data; (d) converting the frequency domain data into time domain data; (e) filtering the time domain data by the filter thereby obtaining a set of time domain prefix data; and (f) linking the prefix data with the filtered data thereby forming a frame.
TW086110289A 1996-05-09 1997-10-01 Multimode digital modem a modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. TW345791B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US64502096A 1996-05-09 1996-05-09
US08/667,267 US6055268A (en) 1996-05-09 1996-06-20 Multimode digital modem
US08/686,801 US6002722A (en) 1996-05-09 1996-07-19 Multimode digital modem

Publications (1)

Publication Number Publication Date
TW345791B true TW345791B (en) 1998-11-21

Family

ID=27094609

Family Applications (1)

Application Number Title Priority Date Filing Date
TW086110289A TW345791B (en) 1996-05-09 1997-10-01 Multimode digital modem a modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided.

Country Status (1)

Country Link
TW (1) TW345791B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI455567B (en) * 2011-12-29 2014-10-01 Quanta Comp Inc Communication system having common ground mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI455567B (en) * 2011-12-29 2014-10-01 Quanta Comp Inc Communication system having common ground mechanism

Similar Documents

Publication Publication Date Title
TW346704B (en) Direct up-conversion of digital communications signals into analog if output signals by means of pre-distortion filter and frequency replica-selecting bandpass filter
CA2179979A1 (en) Method and apparatus for multiuser-interference reduction
EP0820168A3 (en) Multimode modem, and protocols therefor
EP0084945A3 (en) Direct digital to digital sampling rate conversion method and apparatus
AU7720691A (en) Digital signal encoding apparatus
HK1013511A1 (en) Apparatus method and system for compressing a digital input signal in more than one compression mode
EP0580243A3 (en) Narrow band interference frequency excision method and means for spread spectrum communication
YU44600A (en) Anti-counterfeiting method and apparatus using digital screening
IL113230A0 (en) Method and apparatus for providing synchronous data transmission between digital devices operating at frequencies having a p/q integer ratio relationship
AU2123395A (en) High performance modem using pilote symbols for equalization and frame synchronization
KR950014066B1 (en) Transmition method of digital audio signal
CA2199708A1 (en) Efficient linear power amplification
CA2037780A1 (en) Hybrid perceptual audio coding
WO2003075457A3 (en) Apparatus and method for reducing peak-to-average signal power ratio
MY123526A (en) Method and apparatus for processing a digital signal for analog transmission
KR940004946A (en) Multiresolution Linear Distortion Compensation Method and Apparatus
TW353840B (en) Frequency-domain carrierless AM-PM demodulator
EP0778676A3 (en) Multi-rate digital filter apparatus and method for sigma-delta conversion processes
TW345791B (en) Multimode digital modem a modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided.
ATE150238T1 (en) METHOD FOR PROCESSING A DIGITAL FREQUENCY MULTIPLEX SIGNAL AND ITS DEPARTMENT
DK249785A (en) FREQUENCY MODULATOR, NECESSARY FOR USE IN A TELEVISION RECEIVER
WO2005004499A3 (en) A system and method for excluding narrow band noise from a communication channel
HK1001152A1 (en) Method and apparatus for temperature compensation in a time division multiplex receiver
AU520499B2 (en) Method of digital audio/fdm and pcm/fdm conversion
DE3360307D1 (en) Digital telecommunication system