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