High Efficiency RF Transmitter System Architecture Investigation for Mobile WiMAX Applications
نویسندگان
چکیده
Wireless broadband digital communication systems are facing more and more critical power efficiency problems. Crest Factor (PAPR) is reported to be in 10-12dB range 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 architecture. Complete system solution targeting 23dBm output power is evaluated. Simulation result shows LINC consumes more power than DC if non-clipping modulation scheme used and its complete system efficiency may not be as high as expected when linear combiner used. And polar system has stringent 3 degree phase matching and 0.5dB gain matching requirements constrained by RCE and spectrum mask specifications. Index Terms — WiMAX, OFDM, IFFT, LINC, Polar, Power Amplifier, Power Combiner.
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