The detection and diagnosis of physical layer faults at system level in communications systems remains problematic. This paper presents a cross layer fault detection scheme, suitable for implementation at higher levels in a communications system, with the ability to detect and diagnose the cause of physical layer failure which results in impaired performance. It is based on the distribution of symbol error frequency and the probability of error of the underlying modulation scheme used in the communications system. With this knowledge, a simple counting algorithm is proposed as a diagnostic tool to implement the methodology.
Abstract-The tower-top deployment of base station electronics could prove of utility in future cellular communication applications. We present a scalable, non-radiative, automated calibration scheme for such a system, which employs an array of independently phased transceivers. By coupling an interlinear row of reference transceivers to the array, feedpoint calibration of the array is possible. The theoretical justification for the scheme is presented together with assessment of the accuracy of calibration possible using commercial off the shelf components.
-For higher order PLLs the derivation of the model difference equations become less amenable as the order of the loop filter is increased. In this paper an alternative technique is proposed. This uses the event driven technique, but removes the restriction on the order of the system.In section 2 an overview of event driven modelling of the PLL is given, explaining the purpose and the advantage of using an event driven model over a circuit simulation such as SPICE. In section 3 this alternative technique to modelling is given, examples of this model are presented and verified in section 4.
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