Title: Partial approximate gradient constellation for PAPR reduction in OFDM signals

Authors: Manish Kumar Patidar; Amit Mishra; Rajiv Saxena

Addresses: ECE Department, Jaypee University of Engineering and Technology, A. B. Road Raghogarh, District – Guna, 473226, Madhya Pradesh, India ' ECE Department, Thapar University, Patiala, Dist – Patiala, 147004, Punjab, India ' Jaypee University, Aligarh Road, Anoopshahr District – Bulandshahr, 203390, Uttar Pradesh, India

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.

Keywords: active constellation extension; ACE; approximate gradient project; AGP; orthogonal frequency division multiplexing; OFDM; partial transmit sequence; PTS; peak-to-average power ratio; PAPR reduction; selective mapping; SLM; simulation; bit error rate; BER; to noise ratio; SNR.

DOI: 10.1504/IJSCC.2016.075120

International Journal of Systems, Control and Communications, 2016 Vol.7 No.1, pp.83 - 96

Received: 30 Mar 2015
Accepted: 08 Aug 2015
Published online: 03 Mar 2016 *

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