Title :
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
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;
Conference_Titel :
Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014 IEEE 25th Annual International Symposium on
DOI :
10.1109/PIMRC.2014.7136219
