发明名称 |
Equalisation in an ADSL receiver |
摘要 |
<p>A data transmission system which trains its internal equalizers both in an initialization phase and in a normal communication session. In a transmitter unit, a modulation unit modulates a data signal to be transmitted. This signal is sent out to a telephone subscriber line by a transmitter after being added a cyclic prefix by a prefixing unit. A receiver unit accepts the data signal at its receiver portion. The received signal, however, has been impaired because of non-ideal transmission characteristics of the subscriber line. The receiver unit employs a processor which serves as an equalizer to confine the signal impairment within a period of cyclic prefix of each symbol. The receiver unit further comprises a target channel which provides reference characteristics for use in adapting the processor to the current line characteristics. At an initialization stage, a first training unit performs training by tuning both the target channel and processor. When a normal communication session begins, a second training unit performs training by mainly tuning the processor. <IMAGE></p> |
申请公布号 |
EP1081905(A2) |
申请公布日期 |
2001.03.07 |
申请号 |
EP20000110946 |
申请日期 |
2000.05.25 |
申请人 |
FUJITSU LIMITED |
发明人 |
HASEGAWA, KAZUTOMO;KOIZUMI, NOBUKAZU;MIYOSHI, SEIJI |
分类号 |
H04B3/04;H04J11/00;H04L25/03;H04M3/00;H04M11/00;(IPC1-7):H04L27/26 |
主分类号 |
H04B3/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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