In orthogonal frequency-division multiplexing (OFDM) based massive multiple-input multiple-output (MIMO) downlink system, the problem of peak-to-average power ratio proportion (PAPR) decrease is examined. OFDM consist of more number of unconventional subcarriers, due to the amplitude of that such subcarriers can have high peak values. The transmitted signalling has the high peak-to-average power ratio which is one of the complicated issue in OFDM system of rules .It is difficult to understand which techniques can reduce the effect of PAPR performance in OFDM. In this paper we proposed a Selected-Mapping technique .The briny strategy behind implementing this Selected-Mapping (SLM) technique is to reduce peak to average power in orthogonal frequency division multiplexing system. SLM is a distortion less technique which can reduce PAPR efficiently without incrementing power. Simulation results for the Selected-Mapping demonstrates that the system can achieve significant reduction in PAPR and satisfactory bit error rate performance over the AWGN channel.
