DoF analysis of the K-user MISO broadcast channel with hybrid CSIT

Rassouli, Borzoo; Hao, Chenxi; Clerckx, Bruno

doi:10.1109/icc.2015.7248982

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…which completes the proof of (21). We now state the sub-modularity of rank of matrices (see [24] for more details).…”

Section: A Proof Of Converse For 3-user Miso Broadcast Channel With H...mentioning

confidence: 80%

“…Rx 1 supplying instantaneous CSIT, while Rx 2 , Rx 3 supply delayed CSIT) the prior results suggest that LDoF sum ≤ 17 9 [17], [21], while by Theorem 1, LDoF sum is indeed equal to 9 5 . Similarly, for the case of P P D, the prior results [17], [21] imply that LDoF sum ≤ 7 3 , while by Theorem 1, LDoF sum = 9 4 Remark 2. Theorem 1 implies that the state-of-the-art achievable schemes presented in [18] for P P D and P DD are both optimal from the perspective of LDoF sum .…”

Section: -User Miso Broadcast Channel With Hybrid Csitmentioning

confidence: 95%

“…For instance, for P DD (i.e. Rx 1 supplying instantaneous CSIT, while Rx 2 , Rx 3 supply delayed CSIT) the prior results suggest that LDoF sum ≤ 17 9 [17], [21], while by Theorem 1, LDoF sum is indeed equal to 9 5 . Similarly, for the case of P P D, the prior results [17], [21] imply that LDoF sum ≤ 7 3 , while by Theorem 1, LDoF sum = 9 4 Remark 2.…”

Section: -User Miso Broadcast Channel With Hybrid Csitmentioning

confidence: 99%

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MISO Broadcast Channel With Hybrid CSIT: Beyond Two Users

Lashgari

Tandon

Avestimehr

2016

IEEE Trans. Inform. Theory

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We study the impact of heterogeneity of channel-state-information available at the transmitters (CSIT) on the capacity of broadcast channels with a multiple-antenna transmitter and k single-antenna receivers (MISO BC). In particular, we consider the k-user MISO BC, where the CSIT with respect to each receiver can be either instantaneous/perfect, delayed, or not available; and we study the impact of this heterogeneity of CSIT on the degreesof-freedom (DoF) of such network. We first focus on the 3-user MISO BC; and we completely characterize the DoF region for all possible heterogeneous CSIT configurations, assuming linear encoding strategies at the transmitters. The result shows that the state-of-the-art achievable schemes in the literature are indeed sum-DoF optimal, when restricted to linear encoding schemes. To prove the result, we develop a novel bound, called Interference Decomposition Bound, which provides a lower bound on the interference dimension at a receiver which supplies delayed CSIT based on the average dimension of constituents of that interference, thereby decomposing the interference into its individual components. Furthermore, we extend our outer bound on the DoF region to the general k-user MISO BC, and demonstrate that it leads to an approximate characterization of linear sum-DoF to within an additive gap of 0.5 for a broad range of CSIT configurations. Moreover, for the special case where only one receiver supplies delayed CSIT, we completely characterize the linear sum-DoF.This work has been presented in part in [1], [2].

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“…which completes the proof of (21). We now state the sub-modularity of rank of matrices (see [24] for more details).…”

Section: A Proof Of Converse For 3-user Miso Broadcast Channel With H...mentioning

confidence: 80%

Section: -User Miso Broadcast Channel With Hybrid Csitmentioning

confidence: 95%

Section: -User Miso Broadcast Channel With Hybrid Csitmentioning

confidence: 99%

See 1 more Smart Citation

MISO Broadcast Channel With Hybrid CSIT: Beyond Two Users

Lashgari

Tandon

Avestimehr

2016

IEEE Trans. Inform. Theory

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“…1,2 , user 1 has decoded the Q-MAT data symbols transmitted. Consequently, user 1 can use successive decoding to decode its destined ZF data symbol s 1 [t (7) and (22)). Yet, the Q-MAT data symbols sent during t (R N ) 2…”

Section: B Decoding (Achievability Proof By Induction)mentioning

confidence: 99%

Optimal DoF of the K-User Broadcast Channel with Delayed and Imperfect Current CSIT

Kerret¹,

Gesbert²,

Zhang³

et al. 2016

Preprint

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This work 1 studies the optimal Degrees-of-Freedom (DoF) of the K-User MISO Broadcast Channel (BC) with delayed Channel-State Information at the Transmitter (CSIT) and with additional current noisy CSIT where the current channel estimation error scales in P −α for α ∈ [0, 1]. This papers establishes for the first time the optimal DoF in this setting thanks to a new transmission scheme which achieves the elusive DoF-optimal combining of the Maddah-Ali and Tse scheme (MAT) introduced in their seminal work in 2010 with Zero-Forcing (ZF) for an arbitrary number of users. The derived sum DoF takes the surprisingly simple form (1 − α)K/H K + αK where H K K k=1 1 k is the sum-DoF achieved using solely MAT.

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“…A complete characterization of general MIMO networks with perfect, delayed or unknown CSIT is an open problem. In [11], we provide some answers toward this goal for a K-user multi-user MIMO downlink. An outer bound for the Degrees of Freedom (DoF) region is derived based on the marginal probabilities of CSIT availability of each UE.…”

Section: ) Mimo System With Imperfect Csitmentioning

confidence: 99%

Enhancing LTE with Cloud-RAN and Load-Controlled Parasitic Antenna Arrays

Artuso

Boviz

Checko³

et al. 2016

IEEE Commun. Mag.

Self Cite

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-Cloud radio access network (C-RAN) systems consisting of remote radio heads (RRHs) densely distributed in a coverage area and connected by optical fibers to a cloud infrastructure with large computational capabilities, have the potential to meet the ambitious objectives of next generation mobile networks. Actual implementations of C-RANs tackle fundamental technical and economic challenges. In this article, we present an end-to-end (E2E) solution for practically implementable C-RANs by providing innovative solutions to key issues such as the design of cost-effective hardware and powereffective signals for RRHs, efficient design and distribution of data and control traffic for coordinated communications and conception of a flexible and elastic architecture supporting dynamic allocation of both the densely distributed RRHs and the centralized processing resources in the cloud to create virtual base-stations (BSs). More specifically, we propose a novel antenna array architecture called load-controlled parasitic antenna array (LCPAA) where multiple antennas are fed by a single RF chain. Energy and spectral-efficient modulation as well as signaling schemes that are easy to implement are also provided. Additionally, the design presented for the fronthaul (FH) enables flexibility and elasticity in resource allocation to support BS virtualization. A layered-design of information control for the proposed E2E solution is presented.The feasibility and effectiveness of such LCPAA-enabled C-RAN system setup has been validated through an over-the-air (OTA) demonstration.

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DoF analysis of the K-user MISO broadcast channel with hybrid CSIT

Cited by 12 publications

References 20 publications

MISO Broadcast Channel With Hybrid CSIT: Beyond Two Users

MISO Broadcast Channel With Hybrid CSIT: Beyond Two Users

Optimal DoF of the K-User Broadcast Channel with Delayed and Imperfect Current CSIT

Enhancing LTE with Cloud-RAN and Load-Controlled Parasitic Antenna Arrays

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