In recent years, high speed data communications over twisted pair cables has gained
tremendous demand. Asymmetric Digital Subscriber Line (ADSL) was standardized for
use over twisted pair cables. A critical component in ADSL system is the echo canceller
which is intended to discriminate unwanted echo signals caused by twisted pair interface
circuit called the hybrid. An echo signal is characterized by the hybrid and the line type
the hybrid is connected to. Recently, there has been a great concern that the echo signal
displays wide variations when the twisted pair cable is shared with a telephone. The
amount of echo signal present in the receiver will directly influence the ADSL system
performance. Hence, high performance echo canceller with good tracking capability is
required. In this thesis, a new adaptation scheme called Modified Conjugate Gradient
method is proposed and applied to ADSL echo canceller. It is shown that superior tracking
capability is obtained compared to previously proposed echo canceller using Least Mean
Square (LMS) method while compromising small amount of computational complexity. / Graduation date: 1999
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33930 |
| Date | 22 June 1998 |
| Creators | Inoue, Takao |
| Contributors | Kiaei, Sayfe |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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