Research Paper
Year: 2018 | Month: October | Volume: 5 | Issue: 10 | Pages: 457-464
An Improvement of Scrambling Technique by Using Modified Selected Mapping in OFDM System
W.A.F.W. Othman, S.S.N. Alhady, K. E. Wong, A.A.A. Wahab
School of Electrical & Electronic Engineering, Universiti Sains Malaysia
14300 Nibong Tebal, Penang, Malaysia.
Corresponding Author: A.A.A. Wahab
ABSTRACT
Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme. It is commonly implemented in many applications for communication purpose. The major drawback of OFDM is the high Peak-to-Average Power Ratio (PAPR). This caused the increase of Bit Error Rate (BER) and power consumption. This paper proposed a Modified Selected Mapping (MSLM) scheme to reduce the PAPR. The scheme used the standard arrays of linear block codes. We select a vector with lowest PAPR in each coset of the linear block codes as its coset leader from several transmitted signal. Simulation results show that MSLM scheme was able to reduce PAPR 8.27% more than conventional SLM. This paper also found out that the PAPR of the system increases with the number of subcarriers used.
Key words: OFDM, PAPR, SLM, Modified Selected Mapping (MSLM), linear block code
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