Peak to Average Power Ratio Reduction in Single Carrier OFDMA Systems

Document Type : Original Article

Authors

1 Teach. Assist., MTI University.

2 Prof. Dr., Helwan University.

3 Associate Prof. Dr., Helwan University.

Abstract

Abstract:
Single carrier frequency division multiple access (SC-FDMA) which utilizes single
carrier modulation at the transmitter and frequency domain equalization at the receiver
is a technique that has similar performance and essentially the same overall structure as
those of an OFDMA system. One prominent advantage over OFDMA is that the SCFDMA
signal has lower peak-to-average power ratio ( PAPR ). SC-FDMA has drawn
great attention as an attractive alternative to OFDMA, especially in the uplink
communications where lower PAPR greatly benefits the mobile terminal in terms of the
transmit power efficiency. SC-FDMA is currently a working assumption for the uplink
multiple access scheme in 3GPP Long Term Evolution (LTE). To achieve low PAPR , a
novel scheme, SC-OFDMA with super frame using intermediate mapping (SF-IFDMA),
is proposed in this paper. In our proposed scheme, B frames with N subcarriers will be
combined into one super frame, then SC-OFDM technique is applied to reduce the PAPR
of the super frame, the super frame with lowered PAPR will finally be divided
into B OFDM frames for the transmission. The combining and dividing process is
equivalent to the concatenation process. The proposed scheme requires no side
information and can significantly reduce PAPR while maintaining small number of
subcarriers.

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