Friday, November 2, 2007

What Is Cell Breathing In CDMA System ?

  • In CDMA systems all mobile can use the same carrier frequency at the same time.
  • This means that there will be interference between user in the same cell and neighboring cells.
  • The CDMA spreading and despreading processes allow this interference to be suppressed to some degree.
  • The level of suppression is termed the system processing gain.
  • The processing gain can be defined as
  • The processing gain will vary according to the service.
  • As the loading within a cell is increased, The BS receiver noise floor appears to rise.
  • The mobile must transmit additional power to overcome the increased interference
  • As a result the maximum path loss can be tolerated within a cell is decreased and cell effectively shrinks

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