A hybridized discrete cosine transform based peak to average power ratio reduction in OFDM system using suboptimal Qth circular shifting phase sequence generated matrix(QSCPM) for selected mapping

Abstract

A distortion-less technique which is generally used for peak to average power ratio (PAPR) reduction in OFDM system, selects a signal from many signals which are generated from different number of phases. This distortion-less technique is called as selective mapping (SLM). Selective mapping uses many phase sets for same information in order to minimize PAPR. Hence, it is an important task to design phase-sets very carefully and to transmit these phases to receiver side so that same information can be recovered back. With this objective, in this paper a novel Qth suboptimal circular shifting phase sequence generated matrix (QSCPM) with discrete cosine transform for the reduction of PAPR has been proposed that improves OFDM system performance. Simulation results clearly depict that the proposed algorithm works remarkably well in all the cases compared with conventional SLM algorithm from 64 subcarriers to 512 subcarriers achieving 3.3dB gain as compared with conventional SLM based OFDM system and around 4.3 dB gain with original OFDM system. In this proposed work, designing of phases are very easy and require very less side information to be transmitted. In this way, complexity is greatly reduced and thus statistics of transmitted signal is improved.