NetDoFs of the MISO broadcast channel with delayed CSIT feedback for Finite Rate of innovation channel models

Lejosne, Yohan; Slock, Dirk; Yuan-Wu, Yi

doi:10.1109/isit.2013.6620302

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…global CSIR (cf. [27], [38], [39], see also [29], [40]) whose effect increases as the number of users increases. Additionally asking that current estimation errors are independent of current estimates, is a widely accepted assumption.…”

Section: Discussionmentioning

confidence: 97%

“…When considering extensions to other multiuser networks with potentially more users, such analysis may have to be combined with finding ways to disseminate imperfect global CSIR (cf. [27], [38], [39], see also [29], [40]) whose effect increases as the number of users increases. Additionally asking that current estimation errors are independent of current estimates, is a widely accepted assumption.…”

Section: Discussionmentioning

confidence: 97%

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Toward the Performance Versus Feedback Tradeoff for the Two-User MISO Broadcast Channel

Chen

Elia

2013

IEEE Trans. Inform. Theory

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For the two-user MISO broadcast channel with imperfect and delayed channel state information at the transmitter (CSIT), the work explores the tradeoff between performance on the one hand, and CSIT timeliness and accuracy on the other hand. The work considers a broad setting where communication takes place in the presence of a random fading process, and in the presence of a feedback process that, at any point in time, may provide CSIT estimates -of some arbitrary accuracy -for any past, current or future channel realization. This feedback quality may fluctuate in time across all ranges of CSIT accuracy and timeliness, ranging from perfectly accurate and instantaneously available estimates, to delayed estimates of minimal accuracy. Under standard assumptions, the work derives the degrees-offreedom (DoF) region, which is tight for a large range of CSIT quality. This derived DoF region concisely captures the effect of channel correlations, the accuracy of predicted, current, and delayed-CSIT, and generally captures the effect of the quality of CSIT offered at any time, about any channel.The work also introduces novel schemes which -in the context of imperfect and delayed CSIT -employ encoding and decoding with a phase-Markov structure. The results hold for a large class of block and non-block fading channel models, and they unify and extend many prior attempts to capture the effect of imperfect and delayed feedback. This generality also allows for consideration of novel pertinent settings, such as the new periodically evolving feedback setting, where a gradual accumulation of feedback bits progressively improves CSIT as time progresses across a finite coherence period.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Toward the Performance Versus Feedback Tradeoff for the Two-User MISO Broadcast Channel

Chen

Elia

2013

IEEE Trans. Inform. Theory

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“…This interuser interference alignment condition enables that information symbols for receiver 1 (2) have the same interference shape with the linear combination of the interference signal overheard by receiver 2 (1) in time slot t 1 (t 2 ) in the first phase. Since channel h ,k [n] was selected from a continuous distribution, we construct the precoding coefficients satisfying the conditions in (20) as…”

Section: Achievable Trade-offs Of the X-channelmentioning

confidence: 99%

Distributed Space–Time Interference Alignment With Moderately Delayed CSIT

Lee

Tandon

Heath

2015

IEEE Trans. Wireless Commun.

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Abstract-This paper proposes an interference alignment method with distributed and delayed channel state information at the transmitter (CSIT) for a class of interference networks. The core idea of the proposed method is to align interference signals over time at the unintended receivers in a distributed manner. With the proposed method, achievable trade-offs between the sum of degrees of freedom (sum-DoF) and feedback delay of CSI are characterized in both the X-channel and three-user interference channel to reveal the impact on how the CSI feedback delay affects the sum-DoF of the interference networks. A major implication of derived results is that distributed and moderatelydelayed CSIT is useful to strictly improve the sum-DoF over the case of no CSI at the transmitter in a certain class of interference networks. For a class of X-channels, the results show how to optimally use distributed and moderately-delayed CSIT to yield the same sum-DoF as instantaneous and global CSIT. Further, leveraging the proposed transmission method and the known outer bound results, the sum-capacity of the two-user X-channel with a particular set of channel coefficients is characterized within a constant number of bits.

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“…The corner points take the following values: (1) . Line L 0 corresponds to the bound in (15), Line L 1 corresponds to the bound in (17), while line L 2 corresponds to the bound in (16).…”

Section: Dof Region Of the Mimo Bc And Mimo Icmentioning

confidence: 99%

Symmetric two-user MIMO BC with evolving feedback

Chen

Elia

2014

2014 Information Theory and Applications Workshop (ITA)

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Abstract-Extending recent findings on the two-user MISO broadcast channel (BC) with imperfect and delayed channel state information at the transmitter (CSIT), the work here explores the performance of the two user MIMO BC, in the presence of feedback with evolving quality and timeliness. Under standard assumptions, and in the presence of M antennas at the transmitter and N antennas per receiver, the work derives the DoF region, which is optimal for a large range of current and delayed CSIT quality. This region concisely captures the effect of having predicted, current and delayed-CSIT, as well as concisely captures the effect of the quality of CSIT offered at any time, about any channel realization. In addition to the progress towards describing the limits of using such imperfect and delayed feedback in MIMO settings, the work offers different insights that include the fact that DoF optimality, in the presence of an increased number of receiving antennas, can be achieved with reduced quality feedback.

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NetDoFs of the MISO broadcast channel with delayed CSIT feedback for Finite Rate of innovation channel models

Cited by 5 publications

References 15 publications

Toward the Performance Versus Feedback Tradeoff for the Two-User MISO Broadcast Channel

Toward the Performance Versus Feedback Tradeoff for the Two-User MISO Broadcast Channel

Distributed Space–Time Interference Alignment With Moderately Delayed CSIT

Symmetric two-user MIMO BC with evolving feedback

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