Faster Recursions in Sphere Decoding
Journal article, 2011
Most of the calculations in standard sphere decoders are redundant in the sense that they either calculate quantities that are never used or calculate some quantities more than once. A new method, which is applicable to lattices as well as finite constellations, is proposed to avoid these redundant calculations while still returning the same result. Pseudocode is given to facilitate immediate implementation. Simulations show that the speed gain with the proposed method increases linearly with the lattice dimension. At dimension 60, the new algorithms avoid about 75% of all floating-point operations.
Fincke-Pohst
(LLL) reduction
Closest point search
search
algorithms
multiple-output (MIMO)
lattice code decoder
sphere decoder
Schnorr-Euchner
performance
maximum likelihood (ML) detection
multiple-input
point
Lenstra-Lenstra-Lovasz
lattice
Author
Arash Ghasemmehdi
Chalmers, Signals and Systems
Erik Agrell
Chalmers, Signals and Systems, Communication, Antennas and Optical Networks
IEEE Transactions on Information Theory
0018-9448 (ISSN) 1557-9654 (eISSN)
Vol. 57 6 3530-3536 5773010Areas of Advance
Information and Communication Technology
Subject Categories
Computer and Information Science
DOI
10.1109/tit.2011.2143830