Far-echo cancellation in the presence of frequency offset (full duplex modem)
A design is presented for a full-duplex echo-cancelling data modem based on a combined adaptive reference echo canceller and adaptive channel equalizer. The adaptive reference algorithm has the advantage that interference to the echo canceller caused by the far-end signal can be eliminated by subtra...
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| Veröffentlicht in: | IEEE transactions on communications 1989-06, Vol.37 (6), p.635-644 |
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| container_end_page | 644 |
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| container_issue | 6 |
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| container_title | IEEE transactions on communications |
| container_volume | 37 |
| creator | Quatieri, T.F. O'Leary, G.C. |
| description | A design is presented for a full-duplex echo-cancelling data modem based on a combined adaptive reference echo canceller and adaptive channel equalizer. The adaptive reference algorithm has the advantage that interference to the echo canceller caused by the far-end signal can be eliminated by subtracting an estimate of the far-end signal based on receiver decisions. This technique provides a novel approach for full-duplex far-echo cancellation in which the far echo can be cancelled in spite of carrier-frequency offset. To estimate the frequency offset, the system uses a separate receiver structure for the far echo which provides equalization of the far echo channel and tracks the frequency offset in the far echo. The feasibility of the echo-cancelling algorithms is demonstrated by computer simulation with realistic channel distortions and with 4800-b/s data transmission, at which rate the frequency offset in the far echo becomes important.< > |
| doi_str_mv | 10.1109/26.31148 |
| format | Article |
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The adaptive reference algorithm has the advantage that interference to the echo canceller caused by the far-end signal can be eliminated by subtracting an estimate of the far-end signal based on receiver decisions. This technique provides a novel approach for full-duplex far-echo cancellation in which the far echo can be cancelled in spite of carrier-frequency offset. To estimate the frequency offset, the system uses a separate receiver structure for the far echo which provides equalization of the far echo channel and tracks the frequency offset in the far echo. The feasibility of the echo-cancelling algorithms is demonstrated by computer simulation with realistic channel distortions and with 4800-b/s data transmission, at which rate the frequency offset in the far echo becomes important.< ></description><identifier>ISSN: 0090-6778</identifier><identifier>EISSN: 1558-0857</identifier><identifier>DOI: 10.1109/26.31148</identifier><identifier>CODEN: IECMBT</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Applied sciences ; Computer simulation ; Data communication ; Echo cancellers ; Echo interference ; Equalizers ; Exact sciences and technology ; Frequency estimation ; Interference elimination ; Modems ; Network equipments ; Telecommunications ; Telecommunications and information theory ; Telephony ; Teleprocessing networks. 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The adaptive reference algorithm has the advantage that interference to the echo canceller caused by the far-end signal can be eliminated by subtracting an estimate of the far-end signal based on receiver decisions. This technique provides a novel approach for full-duplex far-echo cancellation in which the far echo can be cancelled in spite of carrier-frequency offset. To estimate the frequency offset, the system uses a separate receiver structure for the far echo which provides equalization of the far echo channel and tracks the frequency offset in the far echo. The feasibility of the echo-cancelling algorithms is demonstrated by computer simulation with realistic channel distortions and with 4800-b/s data transmission, at which rate the frequency offset in the far echo becomes important.< ></description><subject>Applied sciences</subject><subject>Computer simulation</subject><subject>Data communication</subject><subject>Echo cancellers</subject><subject>Echo interference</subject><subject>Equalizers</subject><subject>Exact sciences and technology</subject><subject>Frequency estimation</subject><subject>Interference elimination</subject><subject>Modems</subject><subject>Network equipments</subject><subject>Telecommunications</subject><subject>Telecommunications and information theory</subject><subject>Telephony</subject><subject>Teleprocessing networks. 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Isdn</topic><topic>Wire</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Quatieri, T.F.</creatorcontrib><creatorcontrib>O'Leary, G.C.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Computer and Information Systems Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><jtitle>IEEE transactions on communications</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Quatieri, T.F.</au><au>O'Leary, G.C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Far-echo cancellation in the presence of frequency offset (full duplex modem)</atitle><jtitle>IEEE transactions on communications</jtitle><stitle>TCOMM</stitle><date>1989-06-01</date><risdate>1989</risdate><volume>37</volume><issue>6</issue><spage>635</spage><epage>644</epage><pages>635-644</pages><issn>0090-6778</issn><eissn>1558-0857</eissn><coden>IECMBT</coden><abstract>A design is presented for a full-duplex echo-cancelling data modem based on a combined adaptive reference echo canceller and adaptive channel equalizer. The adaptive reference algorithm has the advantage that interference to the echo canceller caused by the far-end signal can be eliminated by subtracting an estimate of the far-end signal based on receiver decisions. This technique provides a novel approach for full-duplex far-echo cancellation in which the far echo can be cancelled in spite of carrier-frequency offset. To estimate the frequency offset, the system uses a separate receiver structure for the far echo which provides equalization of the far echo channel and tracks the frequency offset in the far echo. The feasibility of the echo-cancelling algorithms is demonstrated by computer simulation with realistic channel distortions and with 4800-b/s data transmission, at which rate the frequency offset in the far echo becomes important.< ></abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/26.31148</doi><tpages>10</tpages></addata></record> |
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| identifier | ISSN: 0090-6778 |
| ispartof | IEEE transactions on communications, 1989-06, Vol.37 (6), p.635-644 |
| issn | 0090-6778 1558-0857 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_25214053 |
| source | IEEE Electronic Library (IEL) |
| subjects | Applied sciences Computer simulation Data communication Echo cancellers Echo interference Equalizers Exact sciences and technology Frequency estimation Interference elimination Modems Network equipments Telecommunications Telecommunications and information theory Telephony Teleprocessing networks. Isdn Wire |
| title | Far-echo cancellation in the presence of frequency offset (full duplex modem) |
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