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Article: Stochastic control of event-driven feedback in multiantenna interference channels

TitleStochastic control of event-driven feedback in multiantenna interference channels
Authors
Issue Date2011
Citation
IEEE Transactions on Signal Processing, 2011, v. 59 n. 12, p. 6112-6126 How to Cite?
AbstractSpatial interference avoidance is a simple and effective way of mitigating interference in multiantenna wireless networks. The deployment of this technique requires channel-state information (CSI) feedback from each receiver to all interferers, resulting in substantial network overhead. To address this issue, this paper proposes the method of distributive control that intelligently allocates CSI bits over multiple feedback links and adapts feedback to channel dynamics. For symmetric channel distributions, it is optimal for each receiver to equally allocate the average sum-feedback rate for different feedback links, thereby decoupling their control. Using the criterion of minimum sum-interference power, the optimal feedback-control policy is shown using stochastic-optimization theory to exhibit opportunism. Specifically, a specific feedback link is turned on only when the corresponding transmit-CSI error is significant or interference-channel gain is large, and the optimal number of feedback bits increases with this gain. For high mobility and considering the sphere-cap-quantized-CSI model, the optimal feedback-control policy is shown to perform water-filling in time, where the number of feedback bits increases logarithmically with the corresponding interference-channel gain. Furthermore, we consider asymmetric channel distributions with heterogeneous path losses and high mobility, and prove the existence of a unique optimal policy for jointly controlling multiple feedback links. Given the sphere-cap-quantized-CSI model, this policy is shown to perform water-filling over feedback links. Finally, simulation demonstrates that feedback-control yields significant throughput gains compared with the conventional differential-feedback method. © 2011 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/194334
ISSN
2015 Impact Factor: 2.624
2015 SCImago Journal Rankings: 2.004
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHuang, K-
dc.contributor.authorLau, VKN-
dc.contributor.authorKim, D-
dc.date.accessioned2014-01-30T03:32:27Z-
dc.date.available2014-01-30T03:32:27Z-
dc.date.issued2011-
dc.identifier.citationIEEE Transactions on Signal Processing, 2011, v. 59 n. 12, p. 6112-6126-
dc.identifier.issn1053-587X-
dc.identifier.urihttp://hdl.handle.net/10722/194334-
dc.description.abstractSpatial interference avoidance is a simple and effective way of mitigating interference in multiantenna wireless networks. The deployment of this technique requires channel-state information (CSI) feedback from each receiver to all interferers, resulting in substantial network overhead. To address this issue, this paper proposes the method of distributive control that intelligently allocates CSI bits over multiple feedback links and adapts feedback to channel dynamics. For symmetric channel distributions, it is optimal for each receiver to equally allocate the average sum-feedback rate for different feedback links, thereby decoupling their control. Using the criterion of minimum sum-interference power, the optimal feedback-control policy is shown using stochastic-optimization theory to exhibit opportunism. Specifically, a specific feedback link is turned on only when the corresponding transmit-CSI error is significant or interference-channel gain is large, and the optimal number of feedback bits increases with this gain. For high mobility and considering the sphere-cap-quantized-CSI model, the optimal feedback-control policy is shown to perform water-filling in time, where the number of feedback bits increases logarithmically with the corresponding interference-channel gain. Furthermore, we consider asymmetric channel distributions with heterogeneous path losses and high mobility, and prove the existence of a unique optimal policy for jointly controlling multiple feedback links. Given the sphere-cap-quantized-CSI model, this policy is shown to perform water-filling over feedback links. Finally, simulation demonstrates that feedback-control yields significant throughput gains compared with the conventional differential-feedback method. © 2011 IEEE.-
dc.languageeng-
dc.relation.ispartofIEEE Transactions on Signal Processing-
dc.titleStochastic control of event-driven feedback in multiantenna interference channels-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/TSP.2011.2165063-
dc.identifier.scopuseid_2-s2.0-81455148137-
dc.identifier.volume59-
dc.identifier.issue12-
dc.identifier.spage6112-
dc.identifier.epage6126-
dc.identifier.isiWOS:000297115500036-

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