This thesis utilizes the digital predistortion technique to improve the linearity of high power amplifiers for WiMAX basestation applications. The power amplifier with the proposed technique can achieve higher output power and efficiency than with the conventional output power backoff technique. Owing to a very high PAPR value of the OFDM modulation signals applied to WiMAX basestation, the linearity requirement for the basestation power amplifiers is very strict. This thesis adopts a look-up table predistorter based on a polar scheme and realizes the digital predistorter circuitry using FPGA. As a result, the implemented digital predistorter successfully enhances the linearity of a 15W Lateral MOSFET Class-AB power amplifier operating in 2.6 GHz WiMAX band. Under the conditions that satisfy the spectrum mask and EVM requirement, the power amplifier with the digital predistorter can operate at higher output power and conversion efficiency than without the digital predistorter.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0729108-175628 |
| Date | 29 July 2008 |
| Creators | Lin, Shih-hao |
| Contributors | Huey-Ru Chuang, Tzyy-Sheng Horng, Kang-Chun Peng, Sheng-Fuh Chang, Chie-In Lee |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0729108-175628 |
| Rights | unrestricted, Copyright information available at source archive |
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