IEICE TRANSACTIONS on Communications
Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge
Summary :
The impact and benefits of channel state information (CSI) are analyzed in terms of degrees-of-freedom (DoFs) in a K-user interference network operating over time-selective channels, where the error variance of CSI estimation is assumed to scale with an exponent of the received signal-to-noise ratio (SNR). The original interference alignment (IA) scheme is used with a slight modification in the network. Then, it is shown that the DoFs promised by the original IA can be fully achieved under the condition that the CSI quality order, represented as a function of the error variance and the SNR, is greater than or equal to 1. Our result is extended to the case where the number of communication pairs, K, scales with the SNR, i.e., infinite K scenario, by introducing the user scaling order. As a result, this letter provides vital information to the system designer in terms of allocating training resources for channel estimation in practical cellular environments using IA.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E94-B No.12 pp.3579-3582
- Publication Date
- 2011/12/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E94.B.3579
- Type of Manuscript
- LETTER
- Category
- Fundamental Theories for Communications
Authors
Keyword
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Won-Yong SHIN, Muryong KIM, Hyoseok YI, Ajung KIM, Bang Chul JUNG, "Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge" in IEICE TRANSACTIONS on Communications,
vol. E94-B, no. 12, pp. 3579-3582, December 2011, doi: 10.1587/transcom.E94.B.3579.
Abstract: The impact and benefits of channel state information (CSI) are analyzed in terms of degrees-of-freedom (DoFs) in a K-user interference network operating over time-selective channels, where the error variance of CSI estimation is assumed to scale with an exponent of the received signal-to-noise ratio (SNR). The original interference alignment (IA) scheme is used with a slight modification in the network. Then, it is shown that the DoFs promised by the original IA can be fully achieved under the condition that the CSI quality order, represented as a function of the error variance and the SNR, is greater than or equal to 1. Our result is extended to the case where the number of communication pairs, K, scales with the SNR, i.e., infinite K scenario, by introducing the user scaling order. As a result, this letter provides vital information to the system designer in terms of allocating training resources for channel estimation in practical cellular environments using IA.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E94.B.3579/_p
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@ARTICLE{e94-b_12_3579,
author={Won-Yong SHIN, Muryong KIM, Hyoseok YI, Ajung KIM, Bang Chul JUNG, },
journal={IEICE TRANSACTIONS on Communications},
title={Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge},
year={2011},
volume={E94-B},
number={12},
pages={3579-3582},
abstract={The impact and benefits of channel state information (CSI) are analyzed in terms of degrees-of-freedom (DoFs) in a K-user interference network operating over time-selective channels, where the error variance of CSI estimation is assumed to scale with an exponent of the received signal-to-noise ratio (SNR). The original interference alignment (IA) scheme is used with a slight modification in the network. Then, it is shown that the DoFs promised by the original IA can be fully achieved under the condition that the CSI quality order, represented as a function of the error variance and the SNR, is greater than or equal to 1. Our result is extended to the case where the number of communication pairs, K, scales with the SNR, i.e., infinite K scenario, by introducing the user scaling order. As a result, this letter provides vital information to the system designer in terms of allocating training resources for channel estimation in practical cellular environments using IA.},
keywords={},
doi={10.1587/transcom.E94.B.3579},
ISSN={1745-1345},
month={December},}
Copy
TY - JOUR
TI - Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge
T2 - IEICE TRANSACTIONS on Communications
SP - 3579
EP - 3582
AU - Won-Yong SHIN
AU - Muryong KIM
AU - Hyoseok YI
AU - Ajung KIM
AU - Bang Chul JUNG
PY - 2011
DO - 10.1587/transcom.E94.B.3579
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E94-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2011
AB - The impact and benefits of channel state information (CSI) are analyzed in terms of degrees-of-freedom (DoFs) in a K-user interference network operating over time-selective channels, where the error variance of CSI estimation is assumed to scale with an exponent of the received signal-to-noise ratio (SNR). The original interference alignment (IA) scheme is used with a slight modification in the network. Then, it is shown that the DoFs promised by the original IA can be fully achieved under the condition that the CSI quality order, represented as a function of the error variance and the SNR, is greater than or equal to 1. Our result is extended to the case where the number of communication pairs, K, scales with the SNR, i.e., infinite K scenario, by introducing the user scaling order. As a result, this letter provides vital information to the system designer in terms of allocating training resources for channel estimation in practical cellular environments using IA.
ER -
English
