Title :
PWM coding and filtering of an OFDM envelope signal in a C band EER transmitter architecture
Author :
Diet, Antoine ; Berland, Corinne ; Villegas, Martine ; Baudoin, Geneviéve
Author_Institution :
ESIEE-ESYCOM, France
Abstract :
This paper concerns the simulation of OFDM envelope path in an EER architecture. The envelope information is clipped to reduce the dynamic variation, PWM coded and low-pass filtered. The PWM coding is simulated with a modified Schmitt trigger with different hysteresis values. The reference voltage shape and frequency choice are discussed. The low-pass filter parameters depend on the frequency of the reference voltage signal and are summarized. The conclusion shows the tradeoff between spectral response and EVM results for choosing Fcomp (frequency of reference signal in the trigger) and h (hysteresis parameter). All simulations are done under HP-ADS software for 16-QAM modulation scheme.
Keywords :
OFDM modulation; limiters; low-pass filters; microwave circuits; modulation coding; pulse width modulation; quadrature amplitude modulation; transmitters; trigger circuits; 16-QAM modulation scheme; C band EER transmitter architecture; EVM result; HP-ADS software; OFDM envelope path; PWM coding; Schmitt trigger; clipped information; hysteresis value; low-pass filter; orthogonal frequency division multiplexing; pulse width modulation; quadrature amplitude modulation; reference voltage signal; spectral response; Hysteresis; Information filtering; Information filters; Low pass filters; OFDM; Pulse width modulation; Shape; Transmitters; Trigger circuits; Voltage;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
DOI :
10.1109/PIMRC.2004.1368366
