| Paper Details: | Downloads: 461 |
| Serial Number: | P1170832294
|
| Title: | Digital Predistortion in WCDMA Power Amplifier Using Embedded Processor
|
| Authors: | Sanjay Sharma, Ruchi Pasricha
|
| Abstract: | In new generation mobile communication systems (WCDMA), where spectrum efficient linear modulation formats are used, power amplifier (PA) linearity is a key requirement. On the other hand the power amplifier is one of the most power consuming components in a mobile communication system. Therefore its power added efficiency and linearity must be simultaneously high. However, normally a compromise between power added efficiency and linearity has to be accepted in a design. Power amplifiers are usually operated with a back-off in order to fulfill linearity specifications, which in turn results in lower power efficiency. One possible solution is to operate power amplifiers near to saturation where they are highly nonlinear but efficient, and linearize them by using some external circuitry. There are different power amplifier linearization methods available which can be classified mainly as feedback, feedforward and predistortion. This thesis deals mainly with look-up table (LUT) based digital predistortion realized in digital baseband due to its high performance, simplicity, low power consumption, reliability, flexibility, low cost and size. It is attractive because the PA can be designed for high efficiency and the linearity can be improved independently with digital predistortion. The combination of both gives design flexibility for achieving good linearity and efficiency at the same time. Although digital predistortion is known to be a high power consuming and complicated linearization method applicable in base stations where extremely high linearity is required, the studies on digital predistortion showed that with a careful design it is also applicable in handsets resulting in significant linearity improvement.
|
| Keywords: | Embedded, DPD, NIOS, Non-Linearity, Power Amplifier
|
| Journal/Conference: | International Journal of Programmable Devices, Circuits, and Systems
|
| Volume: | 8
|
| Issue: | 1
|
| Submission Date: | 8/4/2008 12:00:00 AM
|
| Review Date: | 9/12/2008 12:00:00 AM
|
| Publishing Date: | 10/11/2008 12:00:00 AM
|
| Article Downloads: | 461
|
| Download: |
|