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Education and Innovation in Embedded Systems Design

USI Università della Svizzera italiana, USI Faculty of Informatics, Advanced Learning and Research Institute USI Università della Svizzera italiana USI Faculty of Informatics USI Advanced Learning and Research Institute
TitleBeamforming for interference mitigation and its implementation on an SDR baseband processor
Publication TypeConference Paper
Year of Publication2011
AuthorsKrdu, A., Y. Lebrun, U. Ahmad, S. Pollin, and M. Li
Conference NameSiPS'11: Proceedings of the IEEE Workshop on Signal Processing Systems
Date PublishedOctober 4-7
Conference LocationBeirut, Lebanon
Keywordsbeamforming, coarse grained reconfigurable array (CGRA), fixed-point arithmetic, long term evolution (LTE), software defined radio (SDR)

We present the first implementation of a distributed beamforming algorithm for interference mitigation on an SDR baseband processor. Co-channel interference (CCI) is becoming a major source of impairments in wireless communications and distributed beamforming is a promising technique to mitigate its negative impact. However, such schemes are challenging to implement in practical scenarios due to their complexity and synchronization requirements. In this paper, we report on implementation of a suboptimal, yet efficient, beamforming scheme for CCI mitigation and present the complexity modeling and algorithm transformations for achieving numerically stability. We also present the fixed-point quantization and the proper mapping on a parallel programmable baseband architecture aimed for software-defined radio (SDR). We optimize this algorithm for a coarse grained reconfigurable array (CGRA) processor and evaluate it in the context of the LTE standard.