Proposed ITU-R Compatible Inter-Site and Inter-Sector Interference Models for LTE-Advanced Networks

Ameen, Araz Sabir; Doufexi, Angela; Nix, Andrew R

doi:10.1109/tvt.2020.3044952

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…B ROADBAND cellular networks based on the current 4G-Long Term Evolution (LTE) or the emerging 5G-New Radio (NR) wireless standards use universal frequency reuse or reuse-1 [1], [2]. In such OFDM/OFDMA blockmodulated networks, all cell towers and sectors use the same frequency resource 1 to provide a higher sum throughput. Co-channel interference (CCI), which arises in such ultradense networks, is a crucial bottleneck that restricts the throughput of the cell-edge user [3].…”

Section: Introductionmentioning

confidence: 99%

“…CCI manifests as inter-cell or inter-sector interference, broadly referred to as inter-tower interference (ITI). This contribution is focussed 1 The word sector is used to refer to the full 360 ˝region served by a cell site, or to simply one part of that region (typically a 120 ˝portion, when three sectors are deployed per cell site). In this paper, the term inter-tower interference (ITI) also subsumes the inter-sector interference that could be present at the sector boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Interference-Aware Accurate Signal Recovery in Sub-1 GHz UHF Band Reuse-1 Cellular OFDMA Downlinks

Giridhar

2022

IEEE Open J. Commun. Soc.

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Reuse-1 systems operating in the sub-1 GHz UHF band are limited by substantial co-channel interference (CCI). In such orthogonal frequency division multiple access (OFDMA) cellular systems, the inter-sector or inter-tower interference (ITI) makes accurate signal recovery quite challenging as sub-1 GHz bands only support single-input single-output (SISO) links. Interference-aware receiver algorithms are essential to mitigate the ITI in such low-frequency bands. Such algorithms enable ubiquitous mobile broadband access over the entire homeland, say with ą 95% geographical coverage with quality of service guarantees. One element of the interference-aware signal recovery is the least-squares-based joint channel estimation scheme that uses non-orthogonal pilot subcarriers. This estimator is then compared with a variant that uses orthogonal pilot subcarriers to bring out the advantage of this joint estimator. It is shown that the proposed joint estimator requires fewer pilots to be well-determined when compared to its under-determined orthogonal counterpart. Moreover, it is easy to implement and does not require any knowledge of channel statistics. This work also derives a compensation factor needed for the interference-aware detector in the presence of inter-carrier interference (ICI) originating from multiple transmitters. Simulation results show that the proposed joint channel estimator outperforms traditional estimators at moderate to high frequency selectivity. The proposed compensation factor to the joint detector is found to be essential for recovering the transmitted signal in the absence of phase-tracking pilots.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interference-Aware Accurate Signal Recovery in Sub-1 GHz UHF Band Reuse-1 Cellular OFDMA Downlinks

Giridhar

2022

IEEE Open J. Commun. Soc.

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A Proposed Analytical Inter-Cell Interference Model for Mobile Cellular Systems with Isotropic Antenna

Abdalqadir,

Ameen

2023

SJES

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4G and beyond cellular systems intend to use a frequency reuse factor of one with three sectors per BS site. This configuration leads to an increase in inter-cell interference (ICI). Thus, ICI modeling is very necessary to design and analyze any cellular system. The impact of ICI is modeled analytically in this paper. The effect of six interfering BS sites surrounding the serving BS is examined. The ICI is first mathematically modeled as a function of BS-UE distance for several environments based on pathloss exponent and then validated using an explicit simulation model. Secondly, the results obtained from the proposed model and the explicit simulation model are compared. The comparisons showed good agreement between the results of the proposed model and the simulation model. The mathematical model is convenient to the standardized ITU-R model and has the flexibility to apply any antenna patterns that is compatible with these international models. Furthermore, this model enables ICI estimation by deploying the serving BS cell only without the need to deploy the surrounding nine interfering cell. This has positive impact on reducing the time required for system level simulation.

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Impact of Inter Cell Interference on the Performance of Homogenous Cellular Systems

Mohammed¹,

Ameen²

2023

SJES

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Deployment of cellular system with frequency reuse of one is critical to support increased data traffic and high data rate applications in 4G and beyond radio interface technologies. Such deployment leads to substantial increase in Inter-Cell Interference (ICI). Therefore, this paper investigates and evaluates the capacity performance of mobile cellular system with a frequency reuse of one and three-sector per Base Station (BS). The communication channel between the BSs and user equipment links is modeled using ITU-R channel model. The study considers different carrier frequencies and different cell ranges. The system performance is assessed in terms of Signal to Noise Ratio (SNR), Signal to Interference plus Noise Ratio (SINR) and ergodic capacity. The SNR and ergodic capacity improve significantly as the cell range and carrier frequency decreases for ICI free scenario. However, for ICI scenario, there are slight variation in the performance when changing the cell range and the carrier frequency. The study recommends a cell size of 800 m.

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Proposed ITU-R Compatible Inter-Site and Inter-Sector Interference Models for LTE-Advanced Networks

Cited by 3 publications

References 25 publications

Interference-Aware Accurate Signal Recovery in Sub-1 GHz UHF Band Reuse-1 Cellular OFDMA Downlinks

Interference-Aware Accurate Signal Recovery in Sub-1 GHz UHF Band Reuse-1 Cellular OFDMA Downlinks

A Proposed Analytical Inter-Cell Interference Model for Mobile Cellular Systems with Isotropic Antenna

Impact of Inter Cell Interference on the Performance of Homogenous Cellular Systems

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