Partial approximate gradient constellation for PAPR reduction in OFDM signals Online publication date: Thu, 03-Mar-2016
by Manish Kumar Patidar; Amit Mishra; Rajiv Saxena
International Journal of Systems, Control and Communications (IJSCC), Vol. 7, No. 1, 2016
Abstract: In this paper, a combinational approach for peak-to-average power ratio reduction in orthogonal frequency division multiplexing is proposed. The key idea of the proposed scheme is to apply partial transmit sequence and approximate gradient project schemes in parallel on two equal halves of subcarrier in an OFDM standard. On one half, partial transmit sequence minimises the PAPR of OFDM symbols through disjoint sub blocks and optimised phase factors, whereas for the other half, approximate gradient project extends the outer constellation points of OFDM symbols dynamically within margin-preserving constraints to reduce the peak magnitude of symbols. The simulation results show that proposed schemes reduces the PAPR as compared to other conventional schemes and maintains the bit error rate performance of the system especially at low signal to noise ratio. Moreover, the proposed method improves the data rate and also reduces the computational complexity when compared with partial transmit sequence scheme.
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