H - Electricity – 03 – D
Patent
H - Electricity
03
D
325/35
H03D 3/04 (2006.01) H04L 27/14 (2006.01) H04L 27/227 (2006.01)
Patent
CA 1106919
Abstract A method and device for measuring the slope of the envelope delay characteristic of a transmission channel and deriving the phase intercept value therefrom. A measurement signal having a frequency spectrum including three rays at frequencies f0, f1 and f2 is sent over the transmission channel f0 is the carrier frequency and fre- quencies f1 and f2 are defined as f1 ? f0 - 1/2T and f2 ? f0 + 1/2T, where 1/T is the signaling rate. At the output of the channel, the three components at frequencies f0, f1 and f2 are extracted from the received measurement signal, and the instantaneous phases ?0, ?1 and ?2 of these three components are then measured. The value of the slope S of the envelope delay characteristic is obtained in ac- cordance with the relation Image where ??, ?? and ?? are the phases of the three rays at frequencies f0, f1 and f2 of the measurement signal sent over the channel. The value of the phase intercept ?i for a given sampling phase ?s is determined in accordance with the relation ?i ? ?o - K S where ?i is the phase of the component at frequency f0 received at the instant Image K is a proportionality constant lying between 0 and 1, and S is the slope expressed in milliseconds.
307835
International Business Machines Corporation
Na
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