Feedforward Linearization Technique to Reduce Intermodulation Distortion and Spourius Free Dynamic Range(SFDR) Measurements

Feedforward Linearization Technique to Reduce Intermodulation Distortion and Spourius Free Dynamic Range(SFDR) Measurements
Author(s):
swapnil parashuram kulkarni, M.R.Madki
Keywords:
Spourius Free Dynamic Range(SFDR)
Abstract
The design of flexible, cheap, and reconfigurable front-ends is a challenging task in terms of the RF transceiver electronics. Many requirements to the analogue components can be met by today’s technologies, however, this may not always be practical except for measurements and prototyping.This paper addresses RF impairments in wideband cognitive radios, especially non-linear distortions in the receiver. Receiver non-linearities affect the reliability of spectrum sensing, a key issue in spectrum awareness. Here, the focus is on mitigation of non-linear distortions using “Feedforward Technique”. We present experimental work studying the effects of non-linear distortions and analysing the performance of a typical wideband software defined receiver. A feed-forward mitigation algorithm with an adaptive filter has been implemented and applied to real measurement data for cleaning the baseband spectrum of distortion products. The results obtained show that a significant suppression of distortion products can be achieved.
Article Details
Unique Paper ID: 144456 Publication Volume & Issue: Volume 3, Issue 11 Page(s): 235 - 239
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