DocumentCode :
1793441
Title :
Mutual information of OFDM systems with nonlinear power amplifier
Author :
Iofedov, Ilia ; Levakov, Igor ; Wulich, Dov
Author_Institution :
Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel
fYear :
2014
fDate :
3-5 Dec. 2014
Firstpage :
1
Lastpage :
5
Abstract :
Per subcarrier mutual information (MI) of OFDM with nonlinear power amplifier is found as a function of backoff (BO) for low and high Peak-SNR values. The proposed method gives close formula to calculate the exact value of MI without any assumption on distortions. Unfortunately, the calculation has exponential complexity. It is shown that exist low complexity approach which results with approximated MI but with controlled accuracy. As known the OFDM based communication has high spectral efficiency, but at the same time has also high peak to average power ratio. As a result the nonlinear power amplifier is driven with high BO to avoid non-linear distortions. We show that such strategy is not optimal and we find optimal BO to obtain maximum MI.
Keywords :
OFDM modulation; power amplifiers; OFDM systems; backoff function; exponential complexity; nonlinear power amplifier; spectral efficiency; subcarrier mutual information; Complexity theory; Discrete Fourier transforms; Gaussian distribution; Mutual information; Nonlinear distortion; OFDM; Vectors; Mutual information; Nonlinear power amplifier; OFDM;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical & Electronics Engineers in Israel (IEEEI), 2014 IEEE 28th Convention of
Conference_Location :
Eilat
Print_ISBN :
978-1-4799-5987-7
Type :
conf
DOI :
10.1109/EEEI.2014.7005848
Filename :
7005848
Link To Document :
بازگشت