[[Image:cdma16.jpg|thumb|600px|center|Dynamic output power adjustment for CDMA transmitters]]
====Power Control==== As the propagation losses between BS and MS's are different according to individual communication distances, the received levels at the base station are different from each other when all mobile stations transmit their signals at the same power. Moreover, the received level fluctuates quickly due to fading. In order to maintain the strength of received signal level at BS, power control technique must be employed in CDMA systems.<br>.
[[Image:cdma17.jpg]]<br>
Power control can be implemented in two ways : open loop power control and closed loop power control<br>
