Change search
ReferencesLink to record
Permanent link

Direct link
Digital Predistortion for Broadcast FM repeaters
KTH, School of Electrical Engineering (EES), Signal Processing.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis presents the design and implementation of a memoryless and adaptive digital predistorter used to linearize a power amplier. Specically, it deals with the implementation of a so-called constantgain predistorter, based on a lookup table, on a digital signal processing board built around an FPGA. The board also has two analog-to-digital converters, two digital-to-analog converters and a PIC microcontroller. By means of a high speed USB interface, input/output data to/from the system can be captured and sent to a PC. The adaptation of the constant-gain predistorter is implemented in Matlab by means of comparing the input and output data. When a new lookup table is ready, it is sent to the board for an update. By stimulating the system with a two-tone signal with center frequency of 162:5 MHzand tone spacing of1 MHz , the third order intermodulation product (IM3) was decreased by28 dB. By stimulating the system with an IS95 CDMA signal with center frequency of 162 :5 MHzand channel width of1:3 MHz , the power of the distortion right next to the channel edges were decreased by 24:7 dB.

Place, publisher, year, edition, pages
2011. , 49 p.
EES Examensarbete / Master Thesis, XR–EE–SB 2011:012
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-53778OAI: diva2:470923
Educational program
Master of Science in Engineering -Engineering Physics
Available from: 2012-01-19 Created: 2011-12-30 Last updated: 2012-03-16Bibliographically approved

Open Access in DiVA

fulltext(1874 kB)416 downloads
File information
File name FULLTEXT01.pdfFile size 1874 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Signal Processing
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 416 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 159 hits
ReferencesLink to record
Permanent link

Direct link