volume | PIER Journals

Abstract

This paper investigates the performance of a Windowing Based Crest Factor Reduction (CFR_WB) technique, to enhance the power efficiency of Radio Frequency (RF) power amplifiers. In particular, CFR_WB is implemented on a Doherty Power Amplifier (DPA) in conjunction with Generalized Memory Polynomial (GMP_DPD), and Volterra series based Digital Predistortion (V_DPD) techniques. Key features like spectral regrowth, Peak to Average Power Ratio (PAPR) reduction, efficiency improvement and Error Vector Magnitude (EVM) have been used to measure the efficacy of the proposed method. Both simulation and experimental results show that the proposed combination of CFR_WB technique with GMP_DPD and V_DPD is able to reduce the PAPR of the complex input signals by nearly 60%, with minimal degrading of the EVM and spectral regrowth. Moreover, such signal with reduced PAPR can be used to overdrive the DPA, allowing for a relevant average efficiency enhancement (i.e., up to 25%), while fulfilling the requirements of modern communication standards such as Wideband Code Division Multiple Access (WCDMA) and long-term evolution (LTE).

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Dr. Deepak Nair Maroor Vikraman

Dr. Rocco Giofre

Prof. Paolo Colantonio