Title :
An EER Transmitter Architecture with Burst-Width Envelope Modulation based on Triangle-Wave Comparison PWM
Author :
Taromaru, Makoto ; Ando, Nobuhiko ; Kodera, Toshiro ; Yano, Kazuto
Author_Institution :
Adv. Telecommun. Res. Inst. Int., Kyoto
Abstract :
High efficiency transmitter architecture based on Kahn envelope elimination and restoration using PWM envelope modulation schemes is studied. At the final stage, it modulates a constant envelope radio frequency signal by on-off keying or "burst width modulation" directly with the PWM or delta-sigma modulated envelope signal without a lowpass filter. This paper shows that it is suitable to use a triangle-wave comparison PWM which has coherent spectrum peaks of spurious due to switching. It is derived from theoretical analysis that the minimum switching/sampling rate is required as five times high as the baseband bandwidth that is much less than that for the delta-sigma modulation. Simulation results show good modulation quality with the EVM less than 1 percent for raised cosine roll-off filtered 64 QAM.
Keywords :
amplitude shift keying; delta-sigma modulation; pulse width modulation; quadrature amplitude modulation; Kahn envelope elimination; burst-width envelope modulation; delta-sigma modulated envelope signal; envelope restoration; minimum sampling rate; minimum switching rate; on-off keying; pulse width modulation envelope modulation schemes; quadrature amplitude modulation; transmitter architecture; triangle-wave comparison pulse width modulation; Bandwidth; Baseband; Delta modulation; Filters; Pulse width modulation; RF signals; Radio frequency; Radio transmitters; Sampling methods; Signal restoration;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-1144-3
Electronic_ISBN :
978-1-4244-1144-3
DOI :
10.1109/PIMRC.2007.4394620
