TITLE:
Performance of OFDM System with Constant Amplitude Modulation
AUTHORS:
Waleed Saad, Nawal El-Fishawy, Sayed El-Rabaie, Mona Shokair
KEYWORDS:
OFDM; Multipath Fading Channels; PAPR; BER; Equalizer; EVM
JOURNAL NAME:
Circuits and Systems,
Vol.4 No.4,
August
6,
2013
ABSTRACT:
The Orthogonal Frequency Division Multiplexing (OFDM) technique has recently received considerable attention for wireless networks. Despite its advantages, it has a major drawback of its high Peak-to-Average Power Ratio (PAPR) value which affects the system efficiency and the cost. In this paper, a proposed system is discussed to achieve 0 dB PAPR value. It depends on a proposed block, called Constant Amplitude (CA) modulation. The whole characteristic mathematical analysis is presented for the proposed system. Additionally, the complexity evolution is explained. Afterwards, many MATLAB simulation programs are executed. Time and frequency domain behaviors are presented. Furthermore, in-band distortion introduced by the proposed CA modulation is calculated in terms of Error Vector Magnitude (EVM). Moreover, the proposed system outperforms the conventional one when compared in terms of PAPR, equalization, and BER under Additive White Gaussian Noise (AWGN) channel and multipath fading channels. In addition, the impact of the proposed scheme design parameter is studied.