Improved signal estimation based on combined forward and backward lattice reduction in MIMO systems

Author

Shimokawa, Tetsuyoshi ; Fujino, Tadashi

Author_Institution

Dept. of Inf. & Commun. Eng., Univ. of Electro-Commun., Chofu

fYear

2008

Firstpage

1

Lastpage

6

Abstract

Lattice reduction aided (LRA) detection with the LLL algorithm has been investigated to achieve the MIMO channel capacity with low computational complexity. This paper proposes an improved LRA-MMSE detection using the forward and the backward reduction LLL algorithms for the 8times8 MIMO to obtain more reliable estimates of the transmitted signals. The proposed method achieved much better BERs than the conventional LRA detection. The transmit signal energy could be saved about 3.5 dB at BER=10^-5, and the BER slope became much steeper, which is almost the same as that with the maximum likelihood detection.

Keywords

MIMO communication; computational complexity; error statistics; least mean squares methods; maximum likelihood detection; BER; LRA-MMSE detection; MIMO systems; backward lattice reduction; computational complexity; forward lattice reduction; improved signal estimation; lattice reduction aided detection; maximum likelihood detection; Channel capacity; Computational complexity; Estimation; Gaussian processes; Lattices; MIMO; Maximum likelihood detection; Receiving antennas; Transmitting antennas; Zinc; LLL algorithm; MIMO; MMSE; ZF; lattice reduction; signal estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on

Conference_Location

Cannes

Print_ISBN

978-1-4244-2643-0

Electronic_ISBN

978-1-4244-2644-7

Type

conf

DOI

10.1109/PIMRC.2008.4699454

Filename

4699454