Title :
RF transmitter architecture investigation for power efficient mobile WiMAX applications
Author :
Rong, Liang ; Jonsson, Fredrik ; Zheng, Lirong ; Carlsson, Mats ; Hedenäs, Charlotta
Author_Institution :
Dept. of ECS, KTH R. Inst. of Technol., Stockholm
Abstract :
Wireless broadband digital communication systems with high spectral efficiency suffer from severe power efficiency problem. Peak-to-Average Power Ratio is reported up to 12dB for WiMAX 802.16e systems implementing OFDM IFFT-1024 and 64-QAM modulation. In this work, outphasing (LINC) and polar transmitter architectures are investigated and compared with direct conversion (DC) architecture. Complete system solution targeting 23dBm output power is evaluated. System level simulation result shows that, with linear power combiner, LINC consumes more power than DC if non-clipping modulation scheme used. And polar system has stringent 3 degree phase matching and 0.5 dB gain matching requirements to meet EVM and spectrum mask specifications.
Keywords :
WiMax; broadband networks; digital communication; mobile communication; power combiners; radio transmitters; IEEE 802.16e; RF transmitter; direct conversion architecture; gain matching; linear power combiner; mobile WiMAX; non-clipping modulation; phase matching; polar transmitter; power efficiency; spectrum mask; wireless broadband digital communication; Broadband communication; Digital communication; OFDM modulation; Peak to average power ratio; Power combiners; Power generation; Radio frequency; Transmitters; WiMAX; Wireless communication;
Conference_Titel :
System-on-Chip, 2008. SOC 2008. International Symposium on
Conference_Location :
Tampere
Print_ISBN :
978-1-4244-2541-9
Electronic_ISBN :
978-1-4244-2542-6
DOI :
10.1109/ISSOC.2008.4694883
