Redovisade

Fractional Sampling Rate Converters

Can Bilgin (TASOC) och Rakesh Gangarajaiah (TASOC)

Sammanfattning

The master thesis is a research into dierent ways of doing fractional sampling rate conversion. The research has been carried out at STEricsson, Lund in co-operation with the department of Electrical and Information Technology, Lund, Sweden. Dierent methods of performing fractional sampling rate conversion have been studied and some new methods have been proposed. Mobile phones in the future will be able to communicate using several dierent standards like LTE, GSM, CDMA. Building a radio which operates in all the dierent frequency bands is of critical importance to save money and to make designs simpler. The major problem with achieving this would be to make a generic radio operating at all dierent frequencies and still meet design goals such as area and power consumption. Fractional sampling rate conversion is a method of converting digitized samples at a particular frequency into another frequency which is not an integral multiple of the input frequency. Several methods already described in previous literature have been studied and modi cation to one of these methods has been proposed. The Farrow lter has been studied in detail and an improvement to this lter has been suggested in this document. An innovative method of doing sample rate conversion has been developed and explained in detail. The new method proves to be more exible than the Farrow lter and has unique advantages which can be used to design radios with lower area and power consumption.

Handledare: Michal Stala (ST Ericsson) och Joachim Rodrigues (EIT)

Examinator: Joachim Rodrigues (EIT)