IEICE TRANSACTIONS on Communications
New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
Summary :
Multiuser multiple input multiple output (MU-MIMO) systems are attracting attention due to their frequency efficiency. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality, especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of these frequency offsets is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in short delay spread environments. To overcome this problem, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulations and measured results.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E90-B No.9 pp.2312-2320
- Publication Date
- 2007/09/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1093/ietcom/e90-b.9.2312
- Type of Manuscript
- Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
- Category
- Smart Antennas
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Keyword
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Yasushi TAKATORI, Riichi KUDO, Atsushi OHTA, Koichi ISHIHARA, Kentaro NISHIMORI, Shuji KUBOTA, "New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO" in IEICE TRANSACTIONS on Communications,
vol. E90-B, no. 9, pp. 2312-2320, September 2007, doi: 10.1093/ietcom/e90-b.9.2312.
Abstract: Multiuser multiple input multiple output (MU-MIMO) systems are attracting attention due to their frequency efficiency. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality, especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of these frequency offsets is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in short delay spread environments. To overcome this problem, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulations and measured results.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.9.2312/_p
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@ARTICLE{e90-b_9_2312,
author={Yasushi TAKATORI, Riichi KUDO, Atsushi OHTA, Koichi ISHIHARA, Kentaro NISHIMORI, Shuji KUBOTA, },
journal={IEICE TRANSACTIONS on Communications},
title={New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO},
year={2007},
volume={E90-B},
number={9},
pages={2312-2320},
abstract={Multiuser multiple input multiple output (MU-MIMO) systems are attracting attention due to their frequency efficiency. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality, especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of these frequency offsets is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in short delay spread environments. To overcome this problem, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulations and measured results.},
keywords={},
doi={10.1093/ietcom/e90-b.9.2312},
ISSN={1745-1345},
month={September},}
Copy
TY - JOUR
TI - New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
T2 - IEICE TRANSACTIONS on Communications
SP - 2312
EP - 2320
AU - Yasushi TAKATORI
AU - Riichi KUDO
AU - Atsushi OHTA
AU - Koichi ISHIHARA
AU - Kentaro NISHIMORI
AU - Shuji KUBOTA
PY - 2007
DO - 10.1093/ietcom/e90-b.9.2312
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2007
AB - Multiuser multiple input multiple output (MU-MIMO) systems are attracting attention due to their frequency efficiency. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality, especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of these frequency offsets is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in short delay spread environments. To overcome this problem, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulations and measured results.
ER -
English
