On OFDM-MRT with nonlinear power amplifier

Author

Iofedov, Ilia ; Wulich, Dov

Author_Institution

Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel

fYear

2014

Firstpage

512

Lastpage

516

Abstract

The influence of a nonlinear power amplifier on the performance of OFDM-MRT is investigated. It is shown that the ratio between the useful signal and the nonlinear distortions is proportional to the number of TX antennas, i.e., the influence of the nonlinear distortions decreases as the number of TX antennas increases. The Distortion Reduction Factor (DRF) is proposed as a performance metric for multi-antenna systems with nonlinear power amplifier. Considering the nonlinear power amplifier in each transmitting branch, a general formula for signal to distortions and noise ratio in the receiver is obtained and symbol error rate is computed. The MRT is compared to MRC and SISO. It is shown that for a low noise scenario the performance of MRT is much better than that of MRC. Full agreement of the theoretical and simulation results is obtained.

Keywords

OFDM modulation; antenna arrays; diversity reception; error statistics; nonlinear distortion; power amplifiers; transmitting antennas; DRF; MRC; OFDM-MRT; SISO; distortion reduction factor; maximal ratio transmission; multiantenna systems; nonlinear distortions; nonlinear power amplifier; signal-to-distortion-noise ratio; symbol error rate; transmission antennas; Antennas; Array signal processing; Noise; Nonlinear distortion; OFDM; Tin; Beamforming; MRC; MRT; Nonlinear Power Amplifier; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014 IEEE 25th Annual International Symposium on

Type

conf

DOI

10.1109/PIMRC.2014.7136219

Filename

7136219