Title: Optimisation of PTS technique for PAPR reduction in MIMO-OFDM-based CRNS

Authors: Sharanjit Kaur; Inderdeep Kaur Aulakh

Addresses: Department of Information Technology, Chandigarh Group of Colleges, Landran, Mohali, India ' Department of Information Technology, UIET, Panjab University, Chandigarh, India

Abstract: In CRNs, the available spectrum has to be shared between various users, OFDM has a feature that supports multiuser access by assigning subcarriers to different users. In wireless transmissions, PAPR is the key challenge in OFDM that affects the BER. In this paper, the main focus is on PTS. The drawback of existing PTS technique is that the number of multiplications of IFFT sub-sequences with the phase vectors required in it are very high. To reduce computational complexity, optimisation is performed. BPSO is used to find optimised phase vector. This phase vector will be one having reduced PAPR. The purpose is to find out the absolute convergence of MIMO multiplexing to reduce the internal phase to phase PAPR in cognitive radio based networks. Results show that in case of PTS-BPSO error reduces at higher rate with less PAPR. BER is reduced at different SNR values as compared to conventional approach.

Keywords: orthogonal frequency division multiplexing; OFDM; partial transmit sequence; PTS; binary particle swarm optimisation; BPSO; particle swarm optimisation; PSO; peak-to-average power ratio; PAPR; bit error rate; BER.

DOI: 10.1504/IJSCC.2019.102738

International Journal of Systems, Control and Communications, 2019 Vol.10 No.4, pp.303 - 316

Accepted: 22 Nov 2018
Published online: 02 Oct 2019 *

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