Conference paper
On Sphere Detection and Minimum-Phase Prefiltered Reduced-State Sequence Estimation
In this paper, prefiltering techniques for Sphere Detection (SD) in frequency-selective channels are examined. It is shown that a link between QL-factorization of the channel matrix and minimum-phase prefiltering exists. As a result, it ispossible to regard SD as a generalization of traditional reducedstate sequence estimation, providing a unifying framework for the two detection methods.
It is illustrated how minimum-phase prefiltering or the Linear Minimum Mean-Square Error Decision Feedback Equalization (LMMSE-DFE) forward filter is capable of reducing the complexity of sphere detectors significantly, while still obtaining near-optimal performance. The significant reduction in complexity is obtained as prefiltering enables earlier decision making in SD.
Simulations carried out in an EDGE system confirm that prefiltering leads to a considerable complexity reduction for sphere detectors.
Language: | English |
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Publisher: | IEEE |
Year: | 2007 |
Pages: | 4237-4241 |
Proceedings: | 2007 IEEE Global Telecommunications Conference |
ISBN: | 1424410436 and 9781424410439 |
Types: | Conference paper |
DOI: | 10.1109/GLOCOM.2007.806 |
ORCIDs: | Winther, Ole |