Comparison of power amplifier non-linearity impact on 60 GHz single carrier and OFDM systems

Authors:
Alexander Maltsev;Artyom Lomayev;Alexey Khoryaev;Alexey Sevastyanov;Roman Maslennikov
Affiliations:
Wireless Standards and Technology Group, Intel Corporation, Nizhny Novgorod, Russia;Wireless Standards and Technology Group, Intel Corporation, Nizhny Novgorod, Russia;Wireless Standards and Technology Group, Intel Corporation, Nizhny Novgorod, Russia;Wireless Standards and Technology Group, Intel Corporation, Nizhny Novgorod, Russia;Wireless Competence Center, N.I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
Venue:
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
Year:
2010

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On the Design of Low-Cost 60-GHz Radios for Multigigabit-per-Second Transmission over Short Distances [Topics in Radio Communications]

IEEE Communications Magazine

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Abstract

This paper presents a detailed analysis of the impact of power amplifier (PA) non-linearity on the performance of single carrier (SC) and OFDM systems in 60 GHz spectrum. The efficiency of the considered systems was analyzed by estimating values of the power amplifier output backoff needed to meet the requirements on the transmit spectrum mask (TSM) compliance and error vector magnitude (EVM). Different models of the PA including an experimentally measured model for the 60 GHz PA were considered. It was estimated that for many types of modulations and PA models, SC system can have up to 1.5 dB higher output power than OFDM system. However, for the experimental PA model accounting for amplitude modulation-phase modulation distortion in addition to amplitude modulation - amplitude modulation distortion, the difference between the OFDM and SC output power levels was minimal, and OFDM even had approximately 1 dB better performance than SC for the BPSK modulation. A potential improvement in the transmit power due to application of digital predistortion techniques was estimated for both systems to be in the range from 1.5 to 3.4 dB.