TY - GEN
T1 - On the performance of linear and nonlinear companding transforms in OFDM systems
AU - Rahmatallah, Yasir
AU - Bouaynaya, Nidhal
AU - Mohan, Seshadri
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2011
Y1 - 2011
N2 - Companding schemes are widely employed to reduce the peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. This paper considers the classes of linear and nonlinear companding schemes and derives a sufficient condition under which the bit error rate (BER) performance of one is superior to that of the other. The high PAPR of the OFDM signal drives the transmitter's power amplifier into its nonlinear region, thus causing nonlinear distortions. In the literature, signal companding is one of the widely used techniques for PAPR reduction. Furthermore, it has been claimed, based on simulation results, that linear companding performs better, in terms of BER, than nonlinear companding for an optimized set of companding parameters. In this paper, we derive sufficient conditions under which these claims are valid. The conditions derived also show that, in practice, nonlinear companding transforms perform better than linear companding transform. Our theoretical analysis is supported by simulation results.
AB - Companding schemes are widely employed to reduce the peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. This paper considers the classes of linear and nonlinear companding schemes and derives a sufficient condition under which the bit error rate (BER) performance of one is superior to that of the other. The high PAPR of the OFDM signal drives the transmitter's power amplifier into its nonlinear region, thus causing nonlinear distortions. In the literature, signal companding is one of the widely used techniques for PAPR reduction. Furthermore, it has been claimed, based on simulation results, that linear companding performs better, in terms of BER, than nonlinear companding for an optimized set of companding parameters. In this paper, we derive sufficient conditions under which these claims are valid. The conditions derived also show that, in practice, nonlinear companding transforms perform better than linear companding transform. Our theoretical analysis is supported by simulation results.
UR - http://www.scopus.com/inward/record.url?scp=84880732840&partnerID=8YFLogxK
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U2 - 10.1109/WTS.2011.5960877
DO - 10.1109/WTS.2011.5960877
M3 - Conference contribution
AN - SCOPUS:84880732840
SN - 9781457701627
T3 - Wireless Telecommunications Symposium
BT - 2011 Wireless Telecommunications Symposium, WTS 2011
T2 - 10th Annual Wireless Telecommunications Symposium, WTS 2011
Y2 - 13 April 2011 through 15 April 2011
ER -