TY - GEN
T1 - Towards the performance of ml and the complexity of MMSE - A hybrid approach
AU - Shim, Byonghyo
AU - Choi, Jun Won
AU - Kang, Insung
PY - 2008
Y1 - 2008
N2 - In this paper, we present a near ML-achieving sphere search technique that reduces the number of search operations significantly over existing sphere decoding (SD) algorithms. While the SD algorithm relies only on causal symbols in evaluating path metric, proposed method accounts for the contribution of non-causal symbols with the aid of per-path minimum mean square error (MMSE) symbol estimation. The ML and MMSE combined cost metric results in the tight necessary condition for sphere decision and hence expedites the pruning of subtrees unlikely to be survived. From the simulations performed over multi-input multi-output (MIMO) wireless channels, it is shown that the computational complexity of the proposed approach is substantially smaller than the existing SD algorithms while providing negligible performance loss.
AB - In this paper, we present a near ML-achieving sphere search technique that reduces the number of search operations significantly over existing sphere decoding (SD) algorithms. While the SD algorithm relies only on causal symbols in evaluating path metric, proposed method accounts for the contribution of non-causal symbols with the aid of per-path minimum mean square error (MMSE) symbol estimation. The ML and MMSE combined cost metric results in the tight necessary condition for sphere decision and hence expedites the pruning of subtrees unlikely to be survived. From the simulations performed over multi-input multi-output (MIMO) wireless channels, it is shown that the computational complexity of the proposed approach is substantially smaller than the existing SD algorithms while providing negligible performance loss.
UR - http://www.scopus.com/inward/record.url?scp=67249126251&partnerID=8YFLogxK
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U2 - 10.1109/GLOCOM.2008.ECP.663
DO - 10.1109/GLOCOM.2008.ECP.663
M3 - Conference contribution
AN - SCOPUS:67249126251
SN - 9781424423248
T3 - GLOBECOM - IEEE Global Telecommunications Conference
SP - 3453
EP - 3457
BT - 2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
T2 - 2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
Y2 - 30 November 2008 through 4 December 2008
ER -