Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)


 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
INTERSYMBOL INTERFERENCE (ISI) ppt
Post: #1

INTERSYMBOL INTERFERENCE (ISI)



.ppt  INTERSYMBOL.ppt (Size: 476 KB / Downloads: 108)

Intersymbol Interference

Intersymbol interference (ISI) occurs when a pulse spreads out in such a way that it interferes with adjacent pulses at the sample instant.
Example: assume polar NRZ line code. The channel outputs are shown as spreaded (width Tb becomes 2Tb) pulses shown (Spreading due to bandlimited channel characteristics).

Intersymbol Interference

If the rectangular multilevel pulses are filtered improperly as they pass through a communications system, they will spread in time, and the pulse for each symbol may be smeared into adjacent time slots and cause Intersymbol Interference.

Combating ISI

Three strategies for eliminating ISI:
Use a line code that is absolutely bandlimited.
Would require Sinc pulse shape.
Can’t actually do this (but can approximate).
Use a line code that is zero during adjacent sample instants.
It’s okay for pulses to overlap somewhat, as long as there is no overlap at the sample instants.
Can come up with pulse shapes that don’t overlap during adjacent sample instants.
Raised-Cosine Rolloff pulse shaping
Use a filter at the receiver to “undo” the distortion introduced by the channel.
Equalizer.

Nyquist’s First Method for Zero ISI

Since pulses are not possible to create due to:
Infinite time duration.
Sharp transition band in the frequency domain.
The Sinc pulse shape can cause significant ISI in the presence of timing errors.
If the received signal is not sampled at exactly the bit instant (Synchronization Errors), then ISI will occur.
We seek a pulse shape that:
Has a more gradual transition in the frequency domain.
Is more robust to timing errors.
Yet still satisfies Nyquist’s first method for zero ISI.
 

Marked Categories : raised cosine ppt, intersymbol interference project, http seminarprojects com thread intersymbol interference isi ppt, intersymbol interference isi, intersymbol interference, what is intersymbol interference ppt, nyquist pulse ppt, reasons for intersymbol interference ppt, explaination of inter symbol interference ppt, cause of intersymbol interference ppt, pulse spreading and interference ppt, inter symbol interference ppt, intersymbol interference pdf for seminar, inter symbol interference, ppt of inter symbol interference, ppt on inter symbol interference, intersymbol interference isi ppt, ppt on intersymbol interference, intersymbol interference ppt,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  contributor personality development project ppt chapter 2 Guest 1 131 Yesterday 04:53 PM
Last Post: jaseela123
  radar simulation using optical sensor ppt Guest 1 183 Yesterday 04:39 PM
Last Post: jaseela123
  packet video in video compression techniques ppt Guest 1 192 Yesterday 04:31 PM
Last Post: jaseela123
  b tech 1st year surface chemistry notes ppt Guest 1 273 Yesterday 04:13 PM
Last Post: jaseela123
  mirrorlink technology ppt download Guest 1 209 Yesterday 03:59 PM
Last Post: jaseela123
  fabrication of oil pump testing equipment ppt Guest 1 217 Yesterday 03:57 PM
Last Post: jaseela123
  tcs designation hierarchy structure ppt Guest 1 0 Yesterday 03:28 PM
Last Post: jaseela123
  ppt presentation on swing bridge for b e civil in india Guest 1 154 Yesterday 03:21 PM
Last Post: jaseela123
Rainbow ppt on women safety in india Guest 1 174 Yesterday 02:46 PM
Last Post: jaseela123
  advantages disadvantages of physical memory in 8086 ppt Guest 1 242 Yesterday 10:45 AM
Last Post: jaseela123
This Page May Contain What is INTERSYMBOL INTERFERENCE (ISI) ppt And Latest Information/News About INTERSYMBOL INTERFERENCE (ISI) ppt,If Not ...Use Search to get more info about INTERSYMBOL INTERFERENCE (ISI) ppt Or Ask Here

Options: