DocumentCode :
2464592
Title :
Lattice Reduction-Aided Uplink Multi-User MIMO in OFDM Cellular Systems
Author :
Itagaki, Masashi ; Takeda, Kazuki ; Adachi, Fumiyuki
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai, Japan
fYear :
2010
fDate :
6-9 Sept. 2010
Firstpage :
1
Lastpage :
5
Abstract :
In cellular systems, multi-user multi-input multi-output (MIMO) multiplexing can increase the number of simultaneous users per cell; however co-channel interference (CCI) from other cells limits the number of users/cell (defined as the cellular capacity). The well-known zero-forcing detection (ZFD) and minimum mean square error detection (MMSED) are computationally efficient detection methods, but their diversity order decreases as the number of users increases. The multi-user signal detection method which has the full diversity order and less complexity is required in order to enhance the cellular capacity. In this paper, we introduce the lattice reduction (LR) aided ZFD and MMSED to the uplink multi-user MIMO using orthogonal frequency division multiplexing (OFDM) and investigate the uplink cellular capacity. LR using Lenstra-Lenstra-Lovasz (LLL) algorithm is a promising technique to improve the performance of ZFD and MMSED. We show that LR aided ZFD and MMSED can obtain larger uplink capacity than conventional ZFD and MMSED at the cost of relatively low increase of computational complexity.
Keywords :
MIMO communication; OFDM modulation; cellular radio; cochannel interference; least mean squares methods; multiuser detection; CCI; Imultiuser multiinput multioutput multiplexing; Lenstra-Lenstra-Lovasz algorithm; MMSED; OFDM cellular system; ZFD; cochannel interference; lattice reduction; minimum mean square error detection; multiuser signal detection; orthogonal frequency division multiplexing; uplink cellular capacity; uplink multiuser MIMO; zero-forcing detection; Bit error rate; Computational complexity; Lattices; MIMO; OFDM; Receiving antennas; Signal detection;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd
Conference_Location :
Ottawa, ON
ISSN :
1090-3038
Print_ISBN :
978-1-4244-3573-9
Electronic_ISBN :
1090-3038
Type :
conf
DOI :
10.1109/VETECF.2010.5594472
Filename :
5594472
Link To Document :
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