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DEPARTMENT OF ELECTRONICS ENGINEERING 
SCHOOL OF ENGINEERING AND TECHNOLOGY 
PONDICHERRY UNIVERSITY 
KALAPET,PUDUCHERRY-605014.
By 
Ashok kumar 
Pavan Kumar 
Under the esteemed guidance of 
smt.ANSUDHA Phd.
 For video communication, 
Very high bit rate and 
High speed communication required. 
 To satisfy this, we must have the modulation 
scheme that can read more number of bits at a time 
and send it with considerably low bit errors
 Introduction 
 Block diagram 
 Effect of fading on OFDM 
 Parameter choice and implementation issuses in 
OFDM 
 references
 OFDM 
 ORTHOGONALITY 
 MULTI CARRIER MODULATION 
 CYCLIC PREFIX
 Modulation 
Changing the characteristics of carrier wave w.r.t. to 
message signal. 
 Multiplexing 
It is a method of sharing a bandwidth with other 
independent data channels. 
OFDM is a Combination of both modulation and 
multiplexing.
Orthogonality 
In order to assure a high spectral efficiency the sub 
channel waveforms must have overlapping transmit 
spectra. 
To enable simple separation of these overlapping 
sub channels at the receiver they need to be 
orthogonal.
Definition of Orthogonality 
Orthogonality is a property that allows the signals 
to be perfectly transmitted over a common channel 
and detected without interference. 
    
C i j 
   
 
  i  
j 
S t S t dt j 
T 
i 0 0
Multicarrier Modulation 
In OFDM, we can use MC modulation 
. 
each one of these sub carriers has a 
width of f W / Nc 
Adv :Intersymbol interference can 
be reduced
Cyclic Prefix 
In an OFDM, loss of orthogality appears due to 
isi resulting in ici 
 
  
 
 
  
   
T 
LOSS T 
 
g 
sym 
SNR 10 log 1 10
 Initially it was assumed that there was no time 
variations imposed by the channel on signal envelope. 
 It was also assumed that errors produced by IFFT/FFT 
processing were negligible. 
 But looking at these effects carefully we will encounter 
with inter carrier interference or inter channel 
interference or simply ICI. 
 ICI can be made zero by making Doppler spread as 
zero
 The use of OFDM in fading/multipath channels 
appears to reduce to a few issues. These are: 
 OFDM Symbol rate for combating delay spread 
 Realizing diversity in OFDM 
 Implementation issues such as Envelope variation 
and synchronization
 High spectral efficiency 
 Simple implementation by FFT 
 Low receiver complexity 
 Suitability for high-data-rate transmission 
 High flexibility in terms of link adaptation
 Xu.fang,xu, Ru and sun, Haixin, ”implementation of 
OFDM by using pulse shaping technique in freq 
domain”2007 IEEE pp 319-323. 
 Anwar.k and yamamoto.H,” a new design of OFDM 
with FFT as spreading codes” 2006IEEE,pp:543-546.
Ofdm communication system

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Ofdm communication system

  • 1. DEPARTMENT OF ELECTRONICS ENGINEERING SCHOOL OF ENGINEERING AND TECHNOLOGY PONDICHERRY UNIVERSITY KALAPET,PUDUCHERRY-605014.
  • 2. By Ashok kumar Pavan Kumar Under the esteemed guidance of smt.ANSUDHA Phd.
  • 3.  For video communication, Very high bit rate and High speed communication required.  To satisfy this, we must have the modulation scheme that can read more number of bits at a time and send it with considerably low bit errors
  • 4.  Introduction  Block diagram  Effect of fading on OFDM  Parameter choice and implementation issuses in OFDM  references
  • 5.  OFDM  ORTHOGONALITY  MULTI CARRIER MODULATION  CYCLIC PREFIX
  • 6.  Modulation Changing the characteristics of carrier wave w.r.t. to message signal.  Multiplexing It is a method of sharing a bandwidth with other independent data channels. OFDM is a Combination of both modulation and multiplexing.
  • 7. Orthogonality In order to assure a high spectral efficiency the sub channel waveforms must have overlapping transmit spectra. To enable simple separation of these overlapping sub channels at the receiver they need to be orthogonal.
  • 8. Definition of Orthogonality Orthogonality is a property that allows the signals to be perfectly transmitted over a common channel and detected without interference.     C i j       i  j S t S t dt j T i 0 0
  • 9. Multicarrier Modulation In OFDM, we can use MC modulation . each one of these sub carriers has a width of f W / Nc Adv :Intersymbol interference can be reduced
  • 10. Cyclic Prefix In an OFDM, loss of orthogality appears due to isi resulting in ici           T LOSS T  g sym SNR 10 log 1 10
  • 11.
  • 12.
  • 13.  Initially it was assumed that there was no time variations imposed by the channel on signal envelope.  It was also assumed that errors produced by IFFT/FFT processing were negligible.  But looking at these effects carefully we will encounter with inter carrier interference or inter channel interference or simply ICI.  ICI can be made zero by making Doppler spread as zero
  • 14.  The use of OFDM in fading/multipath channels appears to reduce to a few issues. These are:  OFDM Symbol rate for combating delay spread  Realizing diversity in OFDM  Implementation issues such as Envelope variation and synchronization
  • 15.  High spectral efficiency  Simple implementation by FFT  Low receiver complexity  Suitability for high-data-rate transmission  High flexibility in terms of link adaptation
  • 16.  Xu.fang,xu, Ru and sun, Haixin, ”implementation of OFDM by using pulse shaping technique in freq domain”2007 IEEE pp 319-323.  Anwar.k and yamamoto.H,” a new design of OFDM with FFT as spreading codes” 2006IEEE,pp:543-546.