Symmetric cellular network embeddings on a torus

Iridon, M.; Matula, David W.

doi:10.1109/icccn.1998.998835

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…We consider a network composed of L = 19 cells (two rings of cells around a central cell), each with a radius of R = 1 km, and K = 9 users distributed uniformly across each cell except for a disk with radius r = 60 m around the base stations. In order to avoid the cell edge effect, cells are wrapped into a torus as in [8], [9]. The large-scale fading coefficients are modeled based on the 'COST-231' model at central frequency f c = 1900 M Hz as 10 log 10 β…”

Section: Simulations and Discussionmentioning

confidence: 99%

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Sectoring in multi-cell massive MIMO systems

Shahsavari

Hassanzadeh

Ashikhmin

et al. 2017

2017 51st Asilomar Conference on Signals, Systems, and Computers

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In this paper, the downlink of a typical massive MIMO system is studied when each base station is composed of three antenna arrays with directional antenna elements serving 120 • of the two-dimensional space. A lower bound for the achievable rate is provided. Furthermore, a power optimization problem is formulated and as a result, centralized and decentralized power allocation schemes are proposed. The simulation results reveal that using directional antennas at base stations along with sectoring can lead to a notable increase in the achievable rates by increasing the received signal power and decreasing 'pilot contamination' interference in multicell massive MIMO systems. Moreover, it is shown that using optimized power allocation can increase 0.95-likely rate in the system significantly.

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Section: Simulations and Discussionmentioning

confidence: 99%

“…where, λ [kl] ji is given in (9). In step 6, array (j, i) ∈ [L] × [3] uses conjugate beamforming based on its channel estimates to transmit the downlink signals {s [kj] : k ∈ [K]} to its users, as where ρ…”

Section: Appendix a Proof Of Theoremmentioning

confidence: 99%

Sectoring in multi-cell massive MIMO systems

Shahsavari

Hassanzadeh

Ashikhmin

et al. 2017

2017 51st Asilomar Conference on Signals, Systems, and Computers

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“…SIMULATION This section presents simulated performance of proposed algorithms. We considered the cases of one layer L = 7 or two layer L = 19 cells, which are wrapped into a torus [23]. Wrapping cells into a torus allows us to imitate a network with infinite cells.…”

Section: Algorithm 6 Decentralized Lsfpmentioning

confidence: 99%

Interference Reduction in Multi-Cell Massive MIMO Systems II: Downlink Analysis for a Finite Number of Antennas

Li¹,

Ashikhmin²,

Marzetta³

2014

Preprint

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Sharing global channel information at base stations (BSs) is commonly assumed for downlink multi-cell precoding. In the context of massive multi-input multi-output (MIMO) systems where each BS is equipped with a large number of antennas, sharing instant fading channel coefficients consumes a large amount of resource. To consider practically implementable methods, we study in this paper interference reduction based on precoding using the large-scale fading coefficients that depend on the path-loss model and are independent of a specific antenna. We focus on the downlink multi-cell precoding designs when each BS is equipped with a practically finite number of antennas. In this operation regime, pilot contamination is not the dominant source of interference, and mitigation of all types of interference is required. This paper uses an optimization approach to design precoding methods for equal qualities of service (QoS) to all users in the network, i.e.,maximizing the minimum signal-to-interference-plus-noise ratios (SINRs) among all users. The formulated optimization is proved to be quasi-convex, and can be solved optimally. We also propose low-complexity suboptimal algorithms through uplink and downlink duality. Simulation results show that the proposed precoding methods improve 5% outage rate for more than 10 3 times, compared to other known interference mitigation techniques.

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“…The network will be modeled as a Cartesian toroid of hexagonal cells. Toroidal cellular network models are used to model infinite planar cellular networks within finite network regions to eliminate undesired boundary effects in cellular performance analysis [15]. The model wraps the universe around in such a way that borders are eliminated with mobiles exiting the universe at one edge appearing at the other.…”

Section: Network Modelmentioning

confidence: 99%

“…The model wraps the universe around in such a way that borders are eliminated with mobiles exiting the universe at one edge appearing at the other. In this paper, we will use a 10 × 10 toroidal universe on a Cartesian grid which effectively models five-tiers of interference [15].…”

Section: Network Modelmentioning

confidence: 99%

NETp1-13: Studies in Downlink Spectral Efficiency of OFDMA Networks with MIMO and Opportunistic Scheduling

et al. 2006

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In this paper we study the downlink spectral efficiency of a wireless network using Orthogonal Frequency Division Multiple Access (OFDMA), Multiple Input Multiple Output (MIMO) antenna systems and Opportunistic Scheduling (OS) techniques. The main purpose of the study is to understand how these techniques interact and influence the spectral efficiency of the network for different antenna configurations and scheduling policies given the coherence bandwidth of the channel and mobile speed. We will use the point-to-point link Shannon outage capacity as the underlying metric for evaluating the overall throughput of the network. The results illustrate the relationships between the different techniques. 1 The effect of channel estimation errors on the performance of the system will be studied at at later date. © 1-4244-0357-X/06/$20.00 2006 IEEE This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE GLOBECOM 2006 proceedings. © 1-4244-0357-X/06/$20.00 2006 IEEE This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE GLOBECOM 2006 proceedings.

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Symmetric cellular network embeddings on a torus

Cited by 6 publications

References 7 publications

Sectoring in multi-cell massive MIMO systems

Sectoring in multi-cell massive MIMO systems

Interference Reduction in Multi-Cell Massive MIMO Systems II: Downlink Analysis for a Finite Number of Antennas

NETp1-13: Studies in Downlink Spectral Efficiency of OFDMA Networks with MIMO and Opportunistic Scheduling

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