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In High Voltage Power Line Communication (HV-PLC) systems based on adaptive OFDM technique, each subcarrier uses a kind of modulation regarding channel state. In other words, there is a tradeoff between occupied bandwidth and BER in adaptive modulation technique. On the other hand, due to the nonlinearity of transmitter side's power amplifier, one of the main problems of multi-carrier systems is high peak to average power ratio (PAPR), which can cause power dissipation and signal distortion. In this paper defected subcarriers due to nonlinearity of TX side, multipath channel, impulsive and Corona noises are devised to sending PAPR reduction codes for reducing PAPR and BER and at the same time for increasing channel spectral efficiency is evaluated as an effective policy of PAPR reduction. Simulation results show that by using this technique, we can access the higher data rates and reliable services to suppress the PAPR, multipath and impulsive noise effects and attain a lower BERs.