Peak-to-average power ratio reduction and digital predistortion effects in power amplifiers in OFDM system

Authors:
Pooria Varahram;Borhanuddin Mohd Ali
Affiliations:
Computer and Communication Systems Engineering Department, Universiti Putra Malaysia, 43400, SerdangSelangor, Malaysia;Computer and Communication Systems Engineering Department, Universiti Putra Malaysia, 43400, SerdangSelangor, Malaysia and Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 ...
Venue:
International Journal of Communication Systems
Year:
2012

Citing 6
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Abstract

In this paper, the effects of peak-to-average power ratio reduction in nonlinear power amplifiers (PAs) by considering memory effects and of digital predistortion are investigated. A new predistortion technique is proposed, which is called the complex gain memory predistortion (CGMP) method. The CGMP is applied to compensate the dynamic memory effects of PAs. The conventional partial transmit sequence method is applied for peak-to-average power ratio reduction, and combining it with the CGMP results in efficiency enhancement and spectrum efficiency improvement. Simulation and results are examined with the two types of PAs and with an OFDM signal with quadrature phase-shift keying modulation. Copyright © 2011 John Wiley & Sons, Ltd. (We propose a digital predistortion technique called complex gain memory predistortion (CGMP) to enhance the linearity of power amplifiers with memory effects and suppress the out-of-band distortion. The partial transmit sequence (PTS) is applied for peak-to-average power ratio (PAPR) reduction and combining it with CGMP results in enhancing the efficiency of the system and reducing the cost.)