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Research Paper | Electronics & Communication Engineering | India | Volume 3 Issue 7, July 2014 | Rating: 6.8 / 10
Compare Between Simple OFDM and OFDM with Companding Technique for Efficient PAPR Reduction
Rikhee Ram, Aashish Hiradhar
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) has become the most widely adopted technology in wireless communication systems. OFDM is limited mainly by its high Peak-to-Average Power Ratio (PAPR). A uniformly distributed nonlinear companding scheme efficiently reduces PAPR with a low Bit Error Rate (BER). However, the uniformly distributed companding scheme cannot perform variably to satisfy the different performance requirements for the systems. Therefore, this work proposes a novel scheme that transforms the OFDM signals into a trapezium distribution. The uniformly distributed companding scheme is a special case of the proposed scheme. The general formulas of the proposed scheme are derived and the trade-off between PAPR reduction and BER performance is achieved by setting the value of a parameter. Then, the simulation results show the PAPR reduction and the BER over the AWGN and multipath channels, indicating that the proposed scheme provides a favorable trade-off between the PAPR reduction and the BER.
Keywords: Companding, OFDM, PAPR
Edition: Volume 3 Issue 7, July 2014,
Pages: 1767 - 1771