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MIMO-OFDM to overcome the problem of Inter-Symbol

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MIMO-OFDM  is  being used  in  many of  the  communication technologies   like  WiMAX, WLAN  etc.  because it  has  numerous advantages  over  previous techniques.  Following  are the  advantages  of MIMO-OFDM: [19] ·       ROBUSTNESS:The  major  advantage of  MIMO-OFDM  is  its  nature of  robustness  again the  multipath  propagation.

 And  that  is a  very  good factor   to  be implemented  in  a wireless  systems  for a  better  data communication.·       CYCLIC PREFIX:The main  of  the MIMO-OFDM  introduction  is cyclic  prefix,  it make  the  systems more  resistance  able towards  the  time dispersion.  Cyclic  prefix help  system  to overcome  the  problem of  Inter-Symbol  Interference (ISI).  It  is  just replicable  for  guard band  for  the multipath  propagation.·       ACCOMPLISHING:There are  n numbers  of narrowband  channels  in  aMIMO-OFDM  channels  so these  Txs  numbers of  channels  are easily  accomplished  as compare  to  the Tx number  of  channel. This  means  it is  not  affected by  the  numbers of  channels.·       HIGH  BITRATE:The  benefit of  MIMO-OFDM  can  be  notable is  its  very high  transmission  rate as  compare  to  the  other transmission  technologies.  This is  accomplished  with the  help  of closely  spaced  multiple channels.

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·       NO WASTING OFDATA:  The one  of  the advantages  of  the MIMO-OFDM  is  if the  data  stream are  affected  by fading  then  that faded  data  stream can  be  deleted to  save  to rest  of  data. 1.1 DISADVANTAGES OF MIMO-OFDM:As  there  are some benefits  of MIMO-OFDM  there are  also  some drawbacks  or  disadvantages of  MIMO-OFDM  which are.

[19] ·       HIGH POWER RATE:  In  MIMO-OFDM the high  peak  to  the  average power  ratio  is required  which  is the  major  of the  drawback  of MIMO-OFDM.  As  it will consume  a lot  of energy to  be  used in  the  system.·       HIGHSYNCHRONIZATION ACCURACY:In  MIMO-OGDM the  main  point is  synchronization  of orthogonal  signals  if  it  is not  synchronized  then it  can  destroy the  whole  signal, which  cause  the interference  in  the signal.

  Phase  noise error  or  the presence  of  Doppler effect  can  cause the  degradation  to the  MIMO-OFDM  system.·       MULTIPATHPROPAGATION:In  MIMO-OFDM it  is  affected by  the  multipath propagation  so  it is  must  effect the  data  stream transmission  at  both ends.  And  it affects  alots.

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