IMPLEMENTATION OF LOW COMPLEXITY AND HIGH THROUGHPUTSPHERE DECODER

摘要

Since finding the nearest point in a lattice for multi-inputrnmulti-output (MIMO) channels is NP-hard, simplifiedrnalgorithms such as a sphere decoder (SD) have beenrnproposed. In this paper, we propose a low area and highrnthroughput sphere decoder based on the well-known onenode-rnper-cycle architecture and present thernimplementation result. Three key contributions are a newrndirect Schnorr–Euchener (SE) enumeration scheme forrnQAM modulation, an efficient storage manipulation andrnthe calculation interleaving to reduce the critical path.rnCompared with current state-of-the-art sphere decoderrnarchitecture, the proposed sphere decoder can save 48%rnof hardware complexity and enhance 54% of thernmaximum operation clock frequency.