发明名称 |
Characteristics determination of a digital subscriber line |
摘要 |
A system, method, and transceiver unit for determining one or more properties of a digital subscriber line (DSL) utilizing a time-variable finite impulse response (FIR) filter. The transceiver unit sends a loop test signal to the line and calculates an impulse response of a reflection of the loop test signal from the line. The calculated impulse response is filtered utilizing the time-variable FIR filter and properties of the line are determined. Characteristics of the FIR filter may be controlled by a set of parameters that vary as a function of time according to a predetermined formula. As a result, the FIR filter provides both high time resolution of closely separated pulses and amplification of far-end pulse reflections. |
申请公布号 |
US8130911(B2) |
申请公布日期 |
2012.03.06 |
申请号 |
US20040720618 |
申请日期 |
2004.12.01 |
申请人 |
BORJESSON PER OLA;LINDQVIST FREDRIK;TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) |
发明人 |
BORJESSON PER OLA;LINDQVIST FREDRIK |
分类号 |
H04M1/24;H04M3/08;H04M3/22 |
主分类号 |
H04M1/24 |
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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