Μελέτη διαλείψεων (FADING) σε κυψελωτά συστήματα με χρήση λογισμικού.
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Ημερομηνία
2009-02-23T11:03:03Z
Συγγραφείς
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Εκδότης
Τ.Ε.Ι. Κρήτης, Σχολή Εφαρμοσμένων Επιστημών (Σ.Εφ.Ε), Τμήμα Ηλεκτρονικών Μηχανικών Τ.Ε.
T.E.I. of Crete, School of Applied Sciences, Department of Electronic Engineering
T.E.I. of Crete, School of Applied Sciences, Department of Electronic Engineering
Επιβλέπων
Περίληψη
Με αυτή την εργασία ο σκοπός μας είναι να μελετήσουμε μέσα από την προσομείωση την επίδραση του flat fading , λαμβάνοντας υπόψιν τις κατάλληλες ιδιότητες του ραδιοσήματος σε ένα κυψελλωτό σύστημα κινητών επικοινωνιών . Με τη χρήση του Matlab κάναμε προσομείωση της Rayleigh και Rician διάλειψης , υπολογίσαμε το outage probability και τέλος παρουσιάζουμε μια σύγκριση ανάμεσα στα μοντέλα Rayleigh και Rician .
The receiver in a mobile communications environment should combine the multipath waves with randomly distributed amplitudes and phases in order to give a resultant signal that fluctuates in time and space . The short-term fluctuation in the signal amplitude caused by the local multipath is called small- scale fading . Small-scale fading can be classified as flat or frequency selective fading . In particular , a received signal is said to undergo flat fading if the mobile radio channel has a constant gain and a linear phase response over a bandwidth larger than the bandwidth of the transmitted signal . The purpose of the thesis is to study through simulation the effect of flat fading taking into account the appropriate statistical properties of the radiofrequency signals in a mobile communication system . By the use of MATLAB software , simulation results of the received signal envelope , the outage probability , etc. are presented . Finally , a comparison between the Rayleigh and Rician fading models is carried out .
The receiver in a mobile communications environment should combine the multipath waves with randomly distributed amplitudes and phases in order to give a resultant signal that fluctuates in time and space . The short-term fluctuation in the signal amplitude caused by the local multipath is called small- scale fading . Small-scale fading can be classified as flat or frequency selective fading . In particular , a received signal is said to undergo flat fading if the mobile radio channel has a constant gain and a linear phase response over a bandwidth larger than the bandwidth of the transmitted signal . The purpose of the thesis is to study through simulation the effect of flat fading taking into account the appropriate statistical properties of the radiofrequency signals in a mobile communication system . By the use of MATLAB software , simulation results of the received signal envelope , the outage probability , etc. are presented . Finally , a comparison between the Rayleigh and Rician fading models is carried out .