Procedure for reduction of the variance of the estimation of the signal to noise ratio of a signal with phase differential amplitude coherent modulation

Characterized in that in order to calculate the samples of the noise power affecting the system, the errors of amplitude and phase increment obtained in the receiver are combined carrying out a translation of those errors (1) and (4) to the corresponding point of the first ring (6) of the constellat...

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Bibliographic Details
Main Authors BADENES CORELLA, AGUSTIN, BLASCO CLARET, JORGE VICENTE, RIVEIRO INSUA, JUAN CARLOS
Format Patent
LanguageChinese
English
Published 16.02.2005
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:Characterized in that in order to calculate the samples of the noise power affecting the system, the errors of amplitude and phase increment obtained in the receiver are combined carrying out a translation of those errors (1) and (4) to the corresponding point of the first ring (6) of the constellation as if this had been the one that was transmitted and without those errors undergoing any modification, in order later on to calculate the modulus squared of the error vector (9). It minimizes and equalizes the variance of the samples obtained for the different values, even and odd, of bits per carrier which the system uses. It reduces the variance of the estimation of the signal to noise ratio in a multiuser digital communications system. Said estimation is necessary for selecting the number of bits per carrier in order to be adapted to the channel and as back-up information in the event of using a receiver with diversity.
Bibliography:Application Number: TW200493114932