DSL transmission system with means for ensuring local echo orthogonality
A digital subscriber line transmission system comprising an IFFT circuit (14) generating successive outgoing time domain symbols (S) on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit (18) generating groups of digital frequency domain coefficients fr...
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| creator | ISSON, OLIVIER NORDSTROEM, TOMAS |
| description | A digital subscriber line transmission system comprising an IFFT circuit (14) generating successive outgoing time domain symbols (S) on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit (18) generating groups of digital frequency domain coefficients from respective incoming time domain symbols (S') received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval ( delta ); and means (82) for, during an end portion of a current incoming symbol, subtracting from the signal (IN) received on the subscriber line an estimated echo obtained by a filter (84) from a signal portion (Xn+1) following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion (Xn) of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval. |
| format | Patent |
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an FFT circuit (18) generating groups of digital frequency domain coefficients from respective incoming time domain symbols (S') received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval ( delta ); and means (82) for, during an end portion of a current incoming symbol, subtracting from the signal (IN) received on the subscriber line an estimated echo obtained by a filter (84) from a signal portion (Xn+1) following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion (Xn) of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval.</description><edition>7</edition><language>eng ; fre ; ger</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; MULTIPLEX COMMUNICATION ; TELEPHONIC COMMUNICATION ; TRANSMISSION ; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION</subject><creationdate>2000</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000913&DB=EPODOC&CC=EP&NR=1035700A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000913&DB=EPODOC&CC=EP&NR=1035700A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ISSON, OLIVIER</creatorcontrib><creatorcontrib>NORDSTROEM, TOMAS</creatorcontrib><title>DSL transmission system with means for ensuring local echo orthogonality</title><description>A digital subscriber line transmission system comprising an IFFT circuit (14) generating successive outgoing time domain symbols (S) on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit (18) generating groups of digital frequency domain coefficients from respective incoming time domain symbols (S') received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval ( delta ); and means (82) for, during an end portion of a current incoming symbol, subtracting from the signal (IN) received on the subscriber line an estimated echo obtained by a filter (84) from a signal portion (Xn+1) following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion (Xn) of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval.</description><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>MULTIPLEX COMMUNICATION</subject><subject>TELEPHONIC COMMUNICATION</subject><subject>TRANSMISSION</subject><subject>TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2000</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNqNyrEKwjAQgOEsDqK-w72AkFLEWbTSwUHQvYRwbQ6Su5I7kb69Dj6A0z98_9r1l8cNrAbWQqokDLqoYYE3WYKCX4BRKiDrqxJPkCWGDBiTgFRLMgmHTLZs3WoMWXH368bBtXue-z3OMqDOISKjDd298e3h6P2paf9YPmlWNEg</recordid><startdate>20000913</startdate><enddate>20000913</enddate><creator>ISSON, OLIVIER</creator><creator>NORDSTROEM, TOMAS</creator><scope>EVB</scope></search><sort><creationdate>20000913</creationdate><title>DSL transmission system with means for ensuring local echo orthogonality</title><author>ISSON, OLIVIER ; 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an FFT circuit (18) generating groups of digital frequency domain coefficients from respective incoming time domain symbols (S') received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval ( delta ); and means (82) for, during an end portion of a current incoming symbol, subtracting from the signal (IN) received on the subscriber line an estimated echo obtained by a filter (84) from a signal portion (Xn+1) following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion (Xn) of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| language | eng ; fre ; ger |
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| subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY MULTIPLEX COMMUNICATION TELEPHONIC COMMUNICATION TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION |
| title | DSL transmission system with means for ensuring local echo orthogonality |
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