Συντάχθηκε 02-12-2011 13:57
από Eleni Stamataki
Email συντάκτη: estamataki<στο>tuc.gr
Ενημερώθηκε:
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Ιδιότητα: σύνταξη/αποχώρηση υπάλληλος.
Τμήμα Ηλεκτρονικών Μηχανικών & Μηχανικών Υπολογιστών
ΠΑΡΟΥΣΙΑΣΗ ΜΕΤΑΠΤΥΧΙΑΚΗΣ ΔΙΑΤΡΙΒΗΣ
ΑΜΠΟΥ ΕΛΧΕΙΡ ΤΖΩΡΤΖΙΝΑ
με θέμα
Maximum – likelihood Noncoherent PAM Detection
Δευτέρα 5 Δεκεμβρίου 2011 ώρα 13:00 μ.μ.
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Αίθουσα Β 1006 Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Επ. Καθ. Καρυστινός Γεώργιος (επιβλέπων)
Καθ. Λιάβας Α.
Επ. Καθ. Μπλέτσας Α.
Abstract
Sequence detection offers significant gains over conventional symbol-by-symbol detection when channel knowledge is not available at the receiver. However, maximum-likelihood (ML) noncoherent sequence detection is often intractable due to exponential complexity in the sequence length. In this work, we develop a polynomial-time ML noncoherent sequence detector for pulse-amplitude modulation (PAM) or quadrature-amplitude modulation (QAM) transmissions in Rayleigh fading.
Our detector follows an auxiliary-angle approach that reduces the exponential-size space of solution vectors to a polynomial-size set of candidate sequences; we prove that this significantly smaller set always contains the ML PAM/QAM sequence. Hence, the proposed detector solves the problem of identifying the ML PAM/QAM sequence in unknown Rayleigh fading with overall polynomial complexity.
