G - Physics – 06 – F
Patent
G - Physics
06
F
354/144
G06F 7/38 (2006.01) H04B 3/46 (2006.01)
Patent
CA 1111562
METHOD AND DEVICE FOR MEASURING THE SLOPE OF THE ENVELOPE DELAY CHARACTERISTIC OF A TRANSMISSION CHANNEL AND THEIR APPLICATION TO THE AUTOMATIC EQUALIZER SELECTION TECHNIQUE Abstract of the Disclosure A method and device for measuring the slope of the envelope delay characteristic in a transmission channel. The slope is determined from a measurement signal received at the output of the channel. In accord- ance with the method of the present invention, the measurement signal in the channel has a frequency spectrum that includes three rays at frequencies f0, f1 and f2 which are approximately located in the center and at the edges of the useful passband of the channel, respectively. 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 from the relation Image ( 2?0 - ?1 - ?2 - 2?? + ?? + ?? ) where ??, ?? and ?? are the phases of the three rays at frequencies f0, f1 and f2 of the measurement signal sent over the channel. When the method of measuring the slope is applied to a data transmission system which employs double sideband-quadrature carrier (DSB-QC) modulation, the measurement signal is generated by causing the carrier to undergo successive phase changes of + .pi./2 and - .pi./2 radians at the signaling rate. When the method of measuring the slope is applied to a data trans- mission system which uses DSB-QC modulation, wherein the receiver in- cludes a set of fixed equalizers, the appropriate fixed equalizer is selected as a function of the measured slope.
308847
International Business Machines Corporation
Na
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