Abstract
Selective mapping (SLM) is one of the core techniques to mitigate the problem of high PAPR in the MIMO-OFDM system. But the complexity of inverse fast Fourier transform (IFFT) increases with increase in the number of phase sequence in the conventional SLM (C-SLM) scheme. However, we can generate alternate signal sequences along with the OFDM sequence without increasing the number of IFFT. This can be achieved by combining in both SLM with additive mapping (SLM-AM) and U2 phase sequence (SLM-U2) respectively. The computational complexity of both (SLM-AM) and (SLM-U2) is comparatively lesser than the C-SLM without degradation the BER and PAPR performance. But these schemes require some extra memory to save the alternative sequences. In this paper we derive a new low computational complexity equation for combination of both (SLM-AM) and (SLM-U2) schemes using M-QAM and M-PSK modulation in MIMO-OFDM system. In the proposed MIMO-OFDM model, we also analyze the computational complexity and PAPR reduction performance of various schemes like C-SLM, SLM-U2, SLM-AM and SLM-AM-U2 respectively. It has been observed that proposed (SLM-AM-U2) provides best PAPR reduction performance. Also, the computational complexity is least in this case.
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