Degrees of Freedom of the MIMO Z-Interference Channel With Delayed CSIT

Mohanty, Kaniska; Varanasi, Mahesh K.

doi:10.1109/lcomm.2015.2483584

Cited by 12 publications

(7 citation statements)

References 4 publications

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“…The DoF region of the MIMO Z-IC with delayed CSIT (with the antenna conditions (3)) was obtained in [3] and is given below:…”

Section: A Comparison With Dof Regionmentioning

confidence: 99%

“…So far, research on delayed CSIT has mainly focused on the DoF region of various networks, in which all relevant communication links are implicitly assumed to be statistically comparable in strength. This includes the characterization of the DoF regions of the two-user MIMO BC, Z-IC and IC with delayed CSIT in [2], [3] and [4], respectively. Achievable DoF results (without converses) for SISO interference and X networks with delayed CSIT were obtained in [5], and bounds on the DoF for the symmetric MIMO three-user BC were obtained in [6].…”

Section: Introductionmentioning

confidence: 99%

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The Generalized Degrees of Freedom Region of the MIMO Z-Interference Channel With Delayed CSIT

Mohanty

Varanasi

2018

IEEE Trans. Inform. Theory

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The generalized degrees of freedom (GDoF) region of the multiple-input multiple-output (MIMO) Gaussian Z-interference channel with an arbitrary number of antennas at each node is established under the assumption of delayed channel state information at transmitters (CSIT). The GDoF region is parameterized by α, which links the interference-to-noise ratio (INR) to the signal-to-noise ratio (SNR) via INR = SNR α . A new outer bound for the GDoF region is established by maximizing a bound on the weighted sum-rate of the two users, which in turn is obtained by using a combination of genie-aided side-information and an extremal inequality. The maximum weighted sum-rate in the high SNR regime is shown to occur when the transmission covariance matrix of the interfering transmitter has full rank. An achievability scheme based on block-Markov encoding and backward decoding is developed which uses interference quantization and digital multicasting to take advantage of the channel statistics of the cross-link, and the scheme is separately shown to be GDoF-optimal in both the weak (α ≤ 1) and strong (α > 1) interference regimes. This is the first complete characterization of the GDoF region of any interference network with delayed CSIT, as well as the first such GDoF characterization of a MIMO network with delayed CSIT and arbitrary number of antennas at each node. For all antenna tuples, the GDoF region is shown to be equal to or larger than the degrees of freedom (DoF) region over the entire range of α, which leads to a V-shaped maximum sum-GDoF as a function of α, with the minimum occurring at α = 1. The delayed CSIT GDoF region and the sum-DoF are compared with their counterparts under perfect CSIT, thereby characterizing all antenna tuples and ranges of α for which delayed CSIT is sufficient to achieve the perfect CSIT GDoF region (or sum-DoF). It is also shown that treating interference as noise is not, in general, GDoF-optimal for the MIMO Z-IC, even in the weak interference regime. Index TermsChannel state information, Delayed CSIT, Generalized degrees of freedom, MIMO, Z-interference channel.

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“…The DoF region of the MIMO Z-IC with delayed CSIT (with the antenna conditions (3)) was obtained in [3] and is given below:…”

Section: A Comparison With Dof Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Generalized Degrees of Freedom Region of the MIMO Z-Interference Channel With Delayed CSIT

Mohanty

Varanasi

2018

IEEE Trans. Inform. Theory

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“…Of the above-mentioned IM schemes, DIN, IS and DIS are designed in ZIC [24]. However, XIC [25] is more common in practical use.…”

Section: Introductionmentioning

confidence: 99%

Space-Power Adaptive Interference Steering to Manage Interference in XIC

Liu

Ding

et al. 2020

IEEE Access

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With the rapid development of wireless communication technologies, interference has become a key impediment in the improvement of network capacity. In practice, although dense deployment of network can effectively increase the spectrum efficiency, severe co-channel interference (CCI) is likely incurred, especially for mobile users in the overlapping areas of multiple access points, leading to serious deterioration of these users' spectral efficiency (SE). Interference steering (IS), emerging as a novel interference management (IM) scheme, can not only eliminate the impact of interference on the desired transmission, but also incur less power overhead than other IM methods. Although some works conducted flexible design of IS via power domain adaptation, the space domain flexibility has not been exploited. Moreover, existing IS works are mainly for the Z-interference channel (ZIC), while in practical use X-interference channel (XIC) is more common. To remedy the above deficiencies, this paper proposes a space-power adaptive interference steering (SPAIS) method in XIC. By adaptively adjusting the strength and spatial feature of the steering signal, SPAIS can not only effectively suppress interference imposed on the interfered receiver (Rx), but also make full use of the power of the steering signal, thus enhancing desired data transmission. Our in-depth simulation results show that compared to existing IM methods, SPAIS can significantly improve the users' SE performance.

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“…The main contribution of this paper is to derive the achievable sum DoF for the two-user [12] . In this paper, we derive DoF regions of MIMO Z-IC with reconfigurable antennas at the receivers assuming that any CSI is not available at the transmitters.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Degrees of Freedom for MIMO Z-Interference Channels with Reconfigurable Antennas in the Absence of CSIT

Yang¹,

Lee²

2017

The Journal of Korean Institute of Communications and Informati

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In this paper, we derive the achievable degrees of freedom (DoF) for multiple-input multiple-output (MIMO) Z-interference channels (Z-IC) with reconfigurable antennas at the receivers, assuming that channel state information is not available at the transmitters. We propose a new linear scheme to align interfering signals and to decode desired signals through the designed preset mode switching pattern of reconfigurable antennas at the receivers. The key idea of our scheme is to use interfering signals as a side information at the interfered receiver by being silent at the corresponding transmitter during some time slots. Consequently, it is shown that the reconfigurable antennas at the receivers can bring a DoF gain if the number of preset modes is greater than the number of RF chains at the receivers.

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Degrees of Freedom of the MIMO Z-Interference Channel With Delayed CSIT

Cited by 12 publications

References 4 publications

The Generalized Degrees of Freedom Region of the MIMO Z-Interference Channel With Delayed CSIT

The Generalized Degrees of Freedom Region of the MIMO Z-Interference Channel With Delayed CSIT

Space-Power Adaptive Interference Steering to Manage Interference in XIC

Degrees of Freedom for MIMO Z-Interference Channels with Reconfigurable Antennas in the Absence of CSIT

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