Question

why power control is required in cellular systems

Answer 1

The received level fluctyuates auickly due to fading .in order to main tain the recaived level at BS, a suitable power control technique must be employed in CDMA systems. we need to control the transmussion power of each user .This control is called tranamition power control
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Answer 2

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In CDMA, since all the mobiles transmit at the same frequency, the internal interference of the network plays a critical role in determining network capacity. Further, each mobile transmitter power must be controlled to limit the interference. Power control is essentially needed to solve the near-far problem.

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