Median codeword Shift (MCS) technique for PAPR reduction with low complexity in OFDM system

Abstract

With the rapid development of today’s communication technology, the need for a system capable to improve spectral efficiency, high data rates and at the same time can reduce inter-symbol interference (ISI) is necessary. Orthogonal Frequency Division Multiplexing (OFDM) meet all the requirements needed. However, the high peak to average power ratio (PAPR) has become its major obstacle. This paper is focusing on the development of Median Codeword Shift (MCS), which a new PAPR reduction technique with the capability to reduce the computational complexity of the system. This can be achieved through codeword structure alterization and bit position manipulation by utilizing the circulant shift process. The simulation results revealed that the proposed technique overwhelm conventional OFDM and SCS with 24% improvement and 0.5 dB gap from SCS. In fact, the proposed technique possess a lower computational complexity by reducing 16.67% of the use of IFFT block in the system in contrast with SCS technique.

Performance of PAPR for Different Modulation Technique Using Cluster Scrambling Codeword Shifting Technique in F-OFDM Systems

“…Peak windowing, selective mapping (SLM), clipping and filtering, block coding approaches, and others are all mentioned by Shukla [5]. In terms of PAPR reduction, various strategies have been proposed by researchers which is Selective Mapping (SLM) [6][7], Partial Transmit Sequence (PTS) [8][9][10][11] and codeword shifting [12][13][14][15][16][17][18][19]. These are some implementations of the multiple signaling approach and the probabilistic method.…”

“…Before the modulation process, data is scrambled at the bit data stream. Multiple signaling is a strategy that focuses on permutating multicarrier signals and adopting the signal with the lowest PAPR value for transmission, whereas probabilistic signaling focuses on modifying control criteria in OFDM signals and optimizing them to obtain better PAPR reduction., by Rozaini [14]. These approaches are designed to reduce PAPR significantly without adding distortion effects.…”

Study of the operational SNR while constructing polar codes

“…Thus in our work we may use simple algorithm only, namely Bhattacharyya bounds based construction. The readers wanting to go deeper into the current study may experiment separately the orthogonal frequencydivision multiplexing (OFDM) [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and exploit our approach to get the effect of such modulation technique on the performance of the code construction. Obviously, OFDM is still an ultimate candidate for wireless applications, since it allows resolving the well-known problem of spectrum underutilization [25].…”

CL-SA-OFDM: Cross-layer and smart antenna based ofdm system performance enhancement

“…A recent work of (Boustani et al [29]) introduces the direction of arrival algorithm for the smart antenna to analze the performance in wireless communication. The work of (Rozaini et al [30]) proposed the concept of PAPR reduction in OFDM system and attained low complex system. Another work (Ait-Saadi et al [31]) introduced the self-adaptive algoritjm for PAPR reduction in OFDM system.…”