IEICE TRANSACTIONS on Communications
Downlink Beamforming with Imperfect Channel Information for a TDD-Based OFDMA System
Summary :
The beamforming weights which can suppress the interfering signal toward out-of-cell mobile stations in downlink are designed for a time division duplexing based OFDMA system when the channel information is not perfect. The derived beamforming weights do not improve the average SINR performance monotonously with the increased transmit SNR if the inverse of the transmit SNR is used as the regularization factor of the beamforming weights and the channel information obtained by the BS to design the BF weights is not perfect. Therefore, we suggest a simple scheme to select the regularization factor. The proposed beamforming weights improve the performance monotonously with the increased transmit SNR and achieve near-optimal performance. The performance achieved by applying the beamforming weights used in uplink to downlink beamforming is also investigated.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E92-B No.9 pp.2967-2971
- Publication Date
- 2009/09/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E92.B.2967
- Type of Manuscript
- LETTER
- Category
- Wireless Communication Technologies
Authors
Keyword
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Eunchul YOON, Joontae KIM, "Downlink Beamforming with Imperfect Channel Information for a TDD-Based OFDMA System" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 9, pp. 2967-2971, September 2009, doi: 10.1587/transcom.E92.B.2967.
Abstract: The beamforming weights which can suppress the interfering signal toward out-of-cell mobile stations in downlink are designed for a time division duplexing based OFDMA system when the channel information is not perfect. The derived beamforming weights do not improve the average SINR performance monotonously with the increased transmit SNR if the inverse of the transmit SNR is used as the regularization factor of the beamforming weights and the channel information obtained by the BS to design the BF weights is not perfect. Therefore, we suggest a simple scheme to select the regularization factor. The proposed beamforming weights improve the performance monotonously with the increased transmit SNR and achieve near-optimal performance. The performance achieved by applying the beamforming weights used in uplink to downlink beamforming is also investigated.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.2967/_p
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@ARTICLE{e92-b_9_2967,
author={Eunchul YOON, Joontae KIM, },
journal={IEICE TRANSACTIONS on Communications},
title={Downlink Beamforming with Imperfect Channel Information for a TDD-Based OFDMA System},
year={2009},
volume={E92-B},
number={9},
pages={2967-2971},
abstract={The beamforming weights which can suppress the interfering signal toward out-of-cell mobile stations in downlink are designed for a time division duplexing based OFDMA system when the channel information is not perfect. The derived beamforming weights do not improve the average SINR performance monotonously with the increased transmit SNR if the inverse of the transmit SNR is used as the regularization factor of the beamforming weights and the channel information obtained by the BS to design the BF weights is not perfect. Therefore, we suggest a simple scheme to select the regularization factor. The proposed beamforming weights improve the performance monotonously with the increased transmit SNR and achieve near-optimal performance. The performance achieved by applying the beamforming weights used in uplink to downlink beamforming is also investigated.},
keywords={},
doi={10.1587/transcom.E92.B.2967},
ISSN={1745-1345},
month={September},}
Copy
TY - JOUR
TI - Downlink Beamforming with Imperfect Channel Information for a TDD-Based OFDMA System
T2 - IEICE TRANSACTIONS on Communications
SP - 2967
EP - 2971
AU - Eunchul YOON
AU - Joontae KIM
PY - 2009
DO - 10.1587/transcom.E92.B.2967
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2009
AB - The beamforming weights which can suppress the interfering signal toward out-of-cell mobile stations in downlink are designed for a time division duplexing based OFDMA system when the channel information is not perfect. The derived beamforming weights do not improve the average SINR performance monotonously with the increased transmit SNR if the inverse of the transmit SNR is used as the regularization factor of the beamforming weights and the channel information obtained by the BS to design the BF weights is not perfect. Therefore, we suggest a simple scheme to select the regularization factor. The proposed beamforming weights improve the performance monotonously with the increased transmit SNR and achieve near-optimal performance. The performance achieved by applying the beamforming weights used in uplink to downlink beamforming is also investigated.
ER -
English
