Crosstalk Mitigation for LTE-Over-Copper in Downlink Direction

Medeiros, Eduardo; Huang, Yezi; Magesacher, Thomas; Höst, Stefan; Eriksson, Per; Lu, Chenguang; Ödling, Per; Börjesson, Per Ola

doi:10.1109/lcomm.2016.2562100

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…The A-MIMO-RoC architecture presented here finds its roots in the A-RoC systems proposed by [7] for femto-cell systems where existing 4 twisted-pairs LAN cables were suggested to decouple PHY/MAC functionalities from RF units. The A-RoC concept has been extended to LTE networks in [12] using 6 twisted-pairs cables adopted in Digital Subscriber Line scenarios. However, both proposals restrict the cable bandwidth to a few tenths of MHz.…”

Section: System Architecturementioning

confidence: 99%

“…I shows the main differences between available C-RAN architectures where PoE indicates Power over Ethernet and PO means Propagation Only due to the delay of the analog and/or optical components. Moreover, unlike A-RoC systems [8], [12], the SF2SF2 feature allows us to use M signals/pair at a time (e.g., for MIMO) not only 1 signal/pair. Adopting the model (1) and the ideal interference scenario shown in Sect.…”

Section: System Architecturementioning

confidence: 99%

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Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

Matera,

Rampa,

Donati

et al. 2020

Preprint

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Most of the indoor coverage issues arise from network deployments that are usually planned for outdoor scenarios. Moreover, the ever-growing number of devices with different Radio Access Technologies (RATs), expected for new 5G scenarios and to maintain compatibility with older cellular standards (mostly 3G/4G), worsen this situation thus calling for novel bandwidth-efficient, low-latency and cost-effective solutions for indoor coverage. To solve this problem, Centralized Radio Access Network (C-RAN) architectures have been proposed to provide dense and controlled coverage inside buildings. However, alldigital C-RAN solutions are complex and expensive when indoor layout constraints and device costs are considered. We discuss here an analog C-RAN architecture, referred to as Analog MIMO Radio-over-Copper (A-MIMO-RoC), that aims at distributing RF signals indoors over distances in the order of 50 m. The all-analog passive-only design presented here proves the feasibility of analog relaying of MIMO radio signals over LAN cables at frequency bandwidth values up to 400 MHz for multi-RAT applications. After asserting the feasibility of the A-MIMO-RoC platform, we present some experimental results obtained with the proposed architecture. These preliminary results show that the A-MIMO-RoC system is a valid solution towards the design of dedicated 4G/5G indoor wireless systems for the billions of buildings which nowadays still suffer from severe indoor coverage issues.

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Section: System Architecturementioning

confidence: 99%

Section: System Architecturementioning

confidence: 99%

Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

Matera,

Rampa,

Donati

et al. 2020

Preprint

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show abstract

“…Authors proved that, by employing a single-twisted pair in the 21-24 MHz cable frequency band (not used by any DSL service), it is feasible to transport a 3GPP compliant LTE radio signal up to 350 m away from the cabinet. Crosstalk mitigation in LTE-over-copper systems is covered in Medeiros et al [17] for the case of 6 twisted-pairs interfering each other, still in the 21-24 MHz low-frequency range of cable.…”

Section: A Related Work and Motivationmentioning

confidence: 99%

Analog MIMO Radio-Over-Copper Downlink With Space-Frequency to Space-Frequency Multiplexing for Multi-User 5G Indoor Deployments

Matera

Spagnolini

2019

IEEE Trans. Wireless Commun.

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Radio access network (RAN) centralization is at the basis of current mobile networks, in which BaseBand Units (BBUs) and radio antenna units (RAUs) exchange over the FrontHaul (FH) digitized radio-frequency signals through protocols such as the common public radio interface. However, such architecture, as it stands, does not scale to the demands of multiple-antennas 5G systems, thus leading to drastic RAN paradigm changes. Differently from digital RAN architectures, we propose to overcome bandwidth/latency issues due to digitization by employing an all-analog FH for multiple-antenna RAUs based on the analog radio-over-copper (A-RoC) paradigm. The A-RoC is an alternative/complementary solution to FH for the last 200 m, such as for indoor, to reuse existing local area network (LAN) cables with remarkable economic benefits. Although LAN cables contain 4 twisted-pairs with up to 500 MHz bandwidth/ea., their usage is limited by cable attenuation and crosstalk among pairs. This paper demonstrates that a judicious mapping of each radio-frequency signal of each antenna onto a combination of cable pairfrequency allocations, referred to as space-frequency to spacefrequency multiplexing, optimized together with the design of the digital precoding at the BBU, substantially mitigates the cable impairments. The LAN cables can be exploited for last 100-200 m analog transport FH to meet the requirements of 5G indoor networks.

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“…Authors proved that, by employing a single twisted-pair in the 21-24 MHz cable frequency band (not used by any DSL service), it is feasible to transport a 3GPP compliant LTE radio signal up to 350 m away from the cabinet. Crosstalk mitigation in LTE-over-copper systems is covered in Medeiros et al [13] for the case of 6 twisted-pairs interfering with each other, still in the 21-24 MHz frequency range.…”

Section: The Genesis Of the A-mimo-roc Architecturementioning

confidence: 99%

Enhancing Indoor Coverage by Multi-Pairs Copper Cables: The Analog MIMO Radio-over-Copper Architecture

Matera

2019

Special Topics in Information Technology

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Nowadays, the majority of indoor coverage issues arise from networks that are mainly designed for outdoor scenarios. Outdoor networks, somewhat uncontrollably, may penetrate indoors with the consequence of coverage holes and outage issues, hence reducing network performances. Moreover, the ever-growing number of devices expected for 5G worsens this situation, calling for novel bandwidth-efficient, low-latency and cost-effective solutions for indoor wireless coverage. This is the focus of this article, which summarizes the content of my Ph.D. thesis by presenting an analog Centralized Radio Access Network (C-RAN) architecture augmented by copper-cable, possibly pre-existing, to provide dense coverage inside buildings. This fronthaul architecture, referred to as Analog MIMO Radio-over-Copper (AMIMO-RoC), is an extreme RAN functional-split-option: the all-analog Remote Radio Units take the form of tiny, simple and cheap in-home devices, and Base Band Unit includes also signals' digitization. The A-MIMO-RoC architecture is introduced in this article starting from demonstrating its theoretical feasibility. Then, the origin and evolution of A-MIMO-RoC are described step-by-step by briefly going through previous works based on numerical analysis and simulations results. Finally, the overall discussion is complemented by results obtained with a prototype platform, which experimentally prove the capability of A-MIMO-RoC to extend indoor coverage over the last 100-200 m. Prototype results thus confirm that the proposed A-MIMO-RoC architecture is a valid solution towards the design of dedicated 5G indoor wireless systems for the billions of buildings which nowadays still suffer from severe indoor coverage issues. This work is a summary of the Ph.D. thesis "Interference Mitigation Techniques in Hybrid Wired-Wireless Communications Systems for Cloud Radio Access Networks with Analog Fronthauling" [1] supervised by Prof. Umberto Spagnolini.

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Crosstalk Mitigation for LTE-Over-Copper in Downlink Direction

Cited by 13 publications

References 6 publications

Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

Analog MIMO Radio-Over-Copper Downlink With Space-Frequency to Space-Frequency Multiplexing for Multi-User 5G Indoor Deployments

Enhancing Indoor Coverage by Multi-Pairs Copper Cables: The Analog MIMO Radio-over-Copper Architecture

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