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Single carrier-frequency division multiple access (SC-FDMA) is a multiple access technique in broadband wireless networks which has been adapted by 3GPP for uplink transmission in 4G mobile communications. In this paper, the nonlinear effect of practical power amplifier (PA) is studied on the power allocated SC-FDMA signals. The interference power on the estimated symbols of all users are derived by two approaches based on the polynomial model of nonlinear PA and allocated power of subcarriers. In the first approach, an accurate analysis is followed.An approximation of the accurate result is presented in the second approach to provide a closed form formula. A simulation study is conducted to verify the analytical outcomes. The simulation and the exact analytical results are significantly matched. Conversely, the approximate relations are extremely suitable for allocating power in system design …