Title :
EER architecture specifications for OFDM transmitter using a class E amplifier
Author :
Diet, A. ; Berland, C. ; Villegas, M. ; Baudoin, G.
Author_Institution :
ESIEE Commun. Syst. Lab., Noisy-Le-Grand, France
Abstract :
This letter presents envelope elimination and restoration (EER) architecture specifications in the case of orthogonal frequency division multiplex C band transmission. A key point is the recombination of envelope and phase information by supply modulation of the power amplifier (PA). Imperfections, such as time mismatch and phase noise can reduce the performances of the transmission. Compression and conversion effects when supply modulating the PA are introduced in this letter with the simulation of a class E power amplifier. This amplifier was designed under HP-ADS using a nonlinear MESFET model. Results are reported in terms of error vector measurement and spectrum for two different numbers of sub-carriers 32 and 128 in 16-QAM and 64-QAM cases.
Keywords :
MESFET circuits; OFDM modulation; power amplifiers; quadrature amplitude modulation; radio transmitters; 16-QAM; 64-QAM; C band transmission; EER architecture specifications; OFDM transmitter; PA modulation; class E amplifier; compression effect; conversion effect; envelope elimination and restoration; error vector measurement; nonlinear Mesfet model; orthogonal frequency division multiplexing; phase noise; power amplifier; sub-carrier; time mismatch; transmission performances; Frequency division multiplexing; MESFETs; Measurement standards; OFDM modulation; Peak to average power ratio; Phase modulation; Phase noise; Power amplifiers; Signal restoration; Transmitters; Class $E$; EER; OFDM; envelope elimination and restoration; orthogonal frequency division multiplex;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.832618
