TITLE:
Proposal of PAPR Reduction Method for OFDM Signal by Re-Ordering of Clusters in Frequency Domain
AUTHORS:
Tanairat Mata, Katsuhiro Naito, Pisit Boonsrimuang, Kazuo Mori, Hideo Kobayashi
KEYWORDS:
OFDM; PAPR; Re-Ordering of Clusters; Cluster ID Number; Packet-Switched Transmission
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.6 No.9,
August
30,
2013
ABSTRACT: One of the limitations of using OFDM
technique is its higher PAPR in the time domain signal. The higher PAPR OFDM signal
would cause the fatal degradation of BER performance and undesirable spectrum
regrowth in the nonlinear channel. One of the promising PAPR reduction methods for
OFDM signal is the Partial Transmit Sequence (PTS) method which can achieve
better PAPR performance with reasonable computation complexity. However the PTS
method is required to inform the phase coefficients of PTS as the side information
to the receiver for the correct demodulation of data information through the data
or separate channels. To simplify the transceiver of OFDM system with the PTS
method, the phase coefficients of PTS are usually embedded in the data
information. However since the phase coefficients of PTS are obtained after the
PTS processing only for the data information at each OFDM symbol, it is hard to
embed the phase coefficients of PTS in the data information separately without
degradation of PAPR performance. To solve this problem, this paper proposes a
new PAPR reduction method based on the packet-switched transmission systems in
which all the clusters within the certain number of OFDM symbols have the
sequential cluster ID numbers embedded in the header of each cluster. The
salient features of the proposed method are to reduce the
PAPR performance by re-ordering of clusters (ROC) in the frequency domain at
the transmitter and to reconstruct the original ordering of clusters by using
the cluster ID number demodulated from each cluster at the receiver. This paper
also proposes a reduction technique of computation complexity for the proposed ROC
method by using the feature of IFFT processing. This paper presents various
computer simulation results to verify the effectiveness of the proposed ROC
method with the reduction technique of computation complexity.