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A Fast Constrained Sphere Decoder for Ill Conditioned Communication Systems

Kanaras, I; Chorti, A; Rodrigues, MRD; Darwazeh, I; (2010) A Fast Constrained Sphere Decoder for Ill Conditioned Communication Systems. IEEE COMMUN LETT , 14 (11) 999 - 1001. 10.1109/LCOMM.2010.093010.100918.

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Abstract

This letter proposes a fast constrained sphere decoder for ill conditioned communications systems that exhibits less complexity than but similar performance to the generalised sphere decoder. The operational principle is based on i) the reduction of the search space by setting the hypersphere initial radius to be equal to the distance to a semidefinite program (SDP) estimate; and ii) the introduction of a heuristic pruning rule to limit the GSD spanning tree. The new algorithm achieves significant reduction in the required computational effort at the expense of a small error penalty for large dimensional systems in low signal to noise ratio (SNR) regimes.

Type:Article
Title:A Fast Constrained Sphere Decoder for Ill Conditioned Communication Systems
DOI:10.1109/LCOMM.2010.093010.100918
Keywords:Sphere decoder, ill-conditioned, regularisation
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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