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DTSTART:19700329T010000
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CATEGORIES:Communications Research Group Seminar
SUMMARY:Why I thought frame synchronisation was the most b
 oring problem in the world and why I am beginning 
 to change my mind - Jossy Sayir
DTSTART;TZID=Europe/London:20150324T110000
DTEND;TZID=Europe/London:20150324T113000
UID:TALK58617AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/58617
DESCRIPTION:Information theoretically\, frame synchronisation 
 is not an issue at all. In coded communications\, 
 I will explain how the decoder can be used to achi
 eve practically perfect frame synchronisation at n
 o extra cost. Hence\, our need to precede data blo
 cks with a synchronisation prefix is a pure waste 
 of resources that we are constrained to for practi
 cal complexity reasons rater than fundamental info
 rmation theoretic reasons. \n\nI will first explor
 e how long such a prefix needs to be and explain w
 hy no rate loss is in fact incurred for synchronis
 ation\, despite the wasted prefix\, depending on h
 ow noisy the channel is. Furthermore\, I will disc
 uss a quick look-in approach to frame synchronisat
 ion via the decoder where synchronisation can be a
 chieved at lower complexity based on the decoder\,
  without a known prefix. I will also show that thi
 s method does not work well for linear codes and i
 ntroduce mixed linear/non-linear codes for which q
 uick look-in synchronisation works as well as pref
 ix-based synchronisation\, and compare the decodin
 g performance of the two systems for reasonable pr
 actical block lengths.\n\nThis subject of this tal
 k is currently the object of a 4th year project un
 der my supervision and much of the material I pres
 ent results from my collaboration with a IIB stude
 nt Joned Sarwar. If you miss or misunderstand this
  talk you'll have a chance to catch up on the subj
 ect during his project presentation on the 3 June.
  
LOCATION:SigProC seminar room (3rd floor of Dept. of Engine
 ering)
CONTACT:Jossy Sayir
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