OS effect in SLM schemes with correlation

In this letter, oversampling effect is analyzed when correlation (CORR) metric is used in the selected mapping (SLM) scheme with the presence of nonlineartiy. In general, 4 times oversampling is enough for estimating continuous signal. But, we can use 2 times oversampling with similar bit error rate (BER) performance. Therefore, we can reduce the computational complexity half roughly. Simulation results show that BER performance when 2 times oversampling is used is almost the same as 4 times oversampling is used. On the other hand, BER performance when 1 times ovesampling (Nyquist rate) is used is degraded than 2 times oversampling or 4 times oversampling are used. By deriving the Pearson correlation coefficient, simulation results can be confirmed.