Real-time Implementation of a DSP-based Algorithm on USRP for Mitigating Non-linear Distortions in the Receiver RF Front-end
Conference: ISWCS 2013 - The Tenth International Symposium on Wireless Communication Systems
08/27/2013 - 08/30/2013 at Ilmenau, Deutschland
Proceedings: ISWCS 2013
Pages: 5Language: englishTyp: PDF
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Authors:
Schlembach, Florian; Grimm, Michael; Thomä, Reiner S. (Electronic Measurement Research Lab, Institute for Information Technology, International Graduate School on Mobile Communications, Ilmenau University of Technology, P.O. Box 100 565, 98684 Ilmenau, Germany)
Abstract:
With the commercial availability of flexible radios, the cognitive radio concept is moving out of textbooks and papers into real-world implementations. However, RF impairments in the front-end turn out to be a significant limitation in practice. The focus of this work is on non-linear distortions in wideband receivers, and their mitigation by means of digital signal processing. Mitigating distortions is essential for maintaining reliable and robust spectrum sensing or end-to-end communication. A feedforward algorithm in the digital domain is applied to clean the baseband signal from distortions. An embedded design on the commercially available software-defined radio platform USRP is presented. The obtained results show that the implemented algorithm successfully reduces intermodulation distortions in real-time, thereby increasing the effective linearity of the frontend.