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Method of managing and monitoring performances in digital radio systems
| Details |
Inventors: Ferrario, Morena; Mendola, Giovanni; Roberto (Cantù, , IT); Valtolina, Roberto; Spalvieri, Arnaldo;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Barnie; Rexford
Assistant Examiner:
Attorney, Agent or Firm: Sughrue Mion, PLLC
A method is described for managing and monitoring the performances in digital radio systems. The idea of the invention provides for identifying the type of distorting phenomenon that possibly affects the monitored radio channel; in this way it is also possible to univocally connect, apart from the cause of degrade, the system performances with one of the performance monitoring methods commonly usable. In practice, the invention utilizes two distinct thresholds, each specific to the related corrupting source, and above all it provides an effective technique for discriminating which of the two thresholds is to be compared with the measure of the quality chosen. In a first preferred embodiment of the invention, the type of distortion present in the channel is identified on the basis of the error autocorrelation test at the threshold decision circuit. |
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DETAILED DESCRIPTION The main object of the present invention is to provide mechanisms which implement the performance monitoring function in a reliable manner, mainly in the sense that they are independent of the degrade source, should it be either flat fading or selective fading.
Indeed, as mentioned above, the effects of a selective distortion (selective fading) or of an in-band uniform attenuation (flat fading), cause different effects on the apparatus and circuits present in the demodulator at the receiver side.
In particular, the FECs (Feed-Forward Error Corrections), often present inside the transmission system, exhibit performances that depend on the statistical distribution of the signal at their input and then, lastly, on the type of distortion suffered by the transmitted signal, whether selective or uniform in band.
This and other objects are achieved by a method having the characteristics set forth in the independent claim 1.
Further advantageous characteristics are set forth in the dependent claims.
All the claims should be considered as an integral part of the present description.
The basic idea of the present invention comprises a first step of identifying the type of distorting phenomenon that possibly affects the monitored radio channel; in this way, it is also possible to univocally connect, apart from the cause of degrade, the system performances with one of the commonly-usable performance monitoring methods.
In practice, the invention provides for the use of two distinct thresholds, each threshold being specific to the related corrupting source and, above all, it provides for an effective technique for discriminating which of the two thresholds has to be compared with the chosen measure of quality.
In a first preferred embodiment of the invention, the type of distortion present in the channel is identified according to the error autocorrelation evaluation at the threshold decision circuit.
The invention will become certainly clear in view of the following detailed description, given by way of mere example and not of limitation and to be read with reference to the attached figures wherein:
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Ring Tones 
