Advanced receiver algorithms for MIMO wireless communications
Proceedings of the conference on Design, automation and test in Europe: Proceedings
Reduced-complexity mimo detector with close-to ml error rate performance
Proceedings of the 17th ACM Great Lakes symposium on VLSI
A universal lattice code decoder for fading channels
IEEE Transactions on Information Theory
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Block-based early termination has been proposed for depth-first based MIMO sphere decoders (SD) in order to provide throughput guarantees. We show in this letter that such termination incurs, even under simple tree and norm choices, significant overhead in the required number of iterations under realistic channel conditions due to the depth-first search's highly variable complexity (number of iterations to achieve a target performance). We propose the use of a constrained version of Dijkstra's metric-first search which exhibits indistinguishable performance while avoiding the impractical memory requirements of Dijkstra's search. We show that for a 4×4 64-subcarrier OFDM system, the proposed alternative achieves ∼2x decrease in complexity as compared to the depth-first SD with block early termination for the same throughput guarantee.