12.1.1.1 Increasing the Transmitted Power

Usually, increasing the transmitted power of each channel results in coverage of a larger area. When the power level is doubled, the gain increases by 3 dB. Increase in covered area can be found as follows. The received power P _r can be obtained from the transmitted power P _t (see Chap. 8), where P _r is a function of the cell radius. Let the received power P _t be the power received in an original cell of a radius of r1

Area covered then is

where ? is a constant and P _r 1 can be obtained from P _t 1.

Case 1. The transmitted power remains unchanged but the received power changes. If the received power is to be strong, the cell radius should be smaller. The relation is

or

If P _r2 = 2P _r1, and the transmitted power remains the same, the radius reduces to

and the area reduces to

Case 2. The transmitted power changes but the received...