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SUMMARY:Why I thought frame synchronisation was the most boring problem in
  the world and why I am beginning to change my mind - Jossy Sayir
DTSTART:20150324T110000Z
DTEND:20150324T113000Z
UID:TALK58617@talks.cam.ac.uk
CONTACT:Jossy Sayir
DESCRIPTION:Information theoretically\, frame synchronisation is not an is
 sue at all. In coded communications\, I will explain how the decoder can b
 e used to achieve practically perfect frame synchronisation at no extra co
 st. Hence\, our need to precede data blocks with a synchronisation prefix 
 is a pure waste of resources that we are constrained to for practical comp
 lexity reasons rater than fundamental information theoretic reasons. \n\nI
  will first explore how long such a prefix needs to be and explain why no 
 rate loss is in fact incurred for synchronisation\, despite the wasted pre
 fix\, depending on how noisy the channel is. Furthermore\, I will discuss 
 a quick look-in approach to frame synchronisation via the decoder where sy
 nchronisation can be achieved at lower complexity based on the decoder\, w
 ithout a known prefix. I will also show that this method does not work wel
 l for linear codes and introduce mixed linear/non-linear codes for which q
 uick look-in synchronisation works as well as prefix-based synchronisation
 \, and compare the decoding performance of the two systems for reasonable 
 practical block lengths.\n\nThis subject of this talk is currently the obj
 ect of a 4th year project under my supervision and much of the material I 
 present results from my collaboration with a IIB student Joned Sarwar. If 
 you miss or misunderstand this talk you'll have a chance to catch up on th
 e subject during his project presentation on the 3 June. 
LOCATION:SigProC seminar room (3rd floor of Dept. of Engineering)
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