Abstract
In this paper, a merit factor-based method is introduced for peak to average power ratio (PAPR) reduction of Orthogonal Frequency Division Multiplexing-based Differential Chaos Shift Keying (OFDM-DCSK) system. We generate some chaotic binary sequences and select some of the generated sequences with good autocorrelation properties, using merit factor measurement before selected mapping (SLM) process. Afterwards, different from conventional SLM, we use the chaotic reference generator to produce binary chaotic sequence as a phase rotator for SLM process. As a result, the phase generation unit in the conventional SLM can be omitted. Furthermore, we show that proposed structure is suitable for the OFDM DCSK system due to the use of non-coherent receiver and dealing with aperiodic autocorrelation function. Finally, the energy efficiency is evaluated, and the Bit Error Rate performance is calculated for the proposed system. Simulation results show that applying the merit factor-based method can improve the PAPR of the system compared with SLM method. Since the number of candidates in the proposed system is equal to the number of candidates in the SLM-based method, employing merit factor-based technique does not impose any redundancy and complexity in comparison to the SLM-based method.
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