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

Matera, Andrea; Spagnolini, Umberto

doi:10.1109/twc.2019.2908369

Cited by 9 publications

(6 citation statements)

References 39 publications

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“…The Radio Dot System [8], sketched in Fig. 1.a, partly overcame this problem while the A-MIMO-RoC architecture [13], [14] was able to relay multiple RATs MIMO signals over multi-pair copper-cables by filling the entire cable bandwidth for each pair. The feasibility of the proposed A-MIMO-RoC system has been shown in [15] by leveraging the end-to-end testing capabilities of the TRIANGLE testbed [16].…”

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%

“…Fig. 1.b shows the generic block diagram of the A-MIMO-RoC architecture [13], [15] where the BBU communicates with the terminals (UEs) as in Fig. 1.c, through the RRU by using remote antennas.…”

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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“…The problem of optimally designing SF2SF multiplexing is tackled for the A-MIMO-RoC downlink channel in single-and multi-UE settings in [17] and [18], respectively. In addition to all the issues due to the analog relaying of signals already mentioned for the uplink channel, the downlink SF2SF problem is complicated by the different power constraints that need to be jointly fulfilled both at the cable input and at the RRU antennas.…”

Section: A-mimo-roc: Numerical Analysis and Simulations Workmentioning

confidence: 99%

“…As a first step, [17] confirms the potential of SF2SF also for the single-UE downlink A-MIMO-RoC channel. Then, [18] shows that, in multi-UE settings, the SF2SF multiplexing optimization (performed at the RRU), jointly designed with digital precoding of the overall wired-plus-wireless channels (performed at the BBU) and UE ordering optimization, is able to cope with both multi-UE interference and analog FH impairments, thus providing substantial performance gains in terms of minimum rate guaranteed for all the UEs. Finally, [19] focuses on the precoder design problem proposing a nearly-optimal BBU precoding algorithm and RRU power amplification strategy for the multi-UE A-MIMO-RoC downlink channel.…”

Section: A-mimo-roc: Numerical Analysis and Simulations Workmentioning

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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“…However, it has been demonstrated that in order to achieve this performance figure, it is needed to define an opportune low-complexity/all-analog mapping of the RF signals at the RRU antennas onto a combination of twisted-pairs/frequency channels over the cable. This wiredwireless resource allocation strategy, denoted as Space-Frequency to Space-Frequency (SF2SF) multiplexing, has been shown to minimize interference among signals carried over different 4 twisted-pairs, hence enabling an efficient usage of the LAN cable bandwidth [11]- [14]. An alternative formulation/solution to the RoC wired-wireless resource scheduling problem has been recently presented for 4G systems [16], and then extended to 5G New Radio (NR) indoor architectures [17,18].…”

Section: Introductionmentioning

confidence: 99%

Analog MIMO Radio-over-Copper: Prototype and Preliminary Experimental Results

Matera

Rampa

Donati

et al. 2019

2019 16th International Symposium on Wireless Communication Systems (ISWCS)

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Analog Multiple-Input Multiple-Output Radio-over-Copper (A-MIMO-RoC) is an effective allanalog FrontHaul (FH) architecture that exploits any pre-existing Local Area Network (LAN) cabling infrastructure of buildings to distribute Radio-Frequency (RF) signals indoors. A-MIMO-RoC, by leveraging a fully analog implementation, completely avoids any dedicated digital interface by using a transparent end-to-end system, with consequent latency, bandwidth and cost benefits. Usually, LAN cables are exploited mainly in the low-frequency spectrum portion, mostly due to the moderate cable attenuation and crosstalk among twisted-pairs. Unlike current systems based on LAN cables, the key feature of the proposed platform is to exploit more efficiently the huge bandwidth capability offered by LAN cables, that contain 4 twisted-pairs reaching up to 500 MHz bandwidth/pair when the length is below 100 m. Several works proposed numerical simulations that assert the feasibility of employing LAN cables for indoor FH applications up to several hundreds of MHz, but an A-MIMO-RoC experimental evaluation is still missing. Here, we present some preliminary results obtained with an A-MIMO-RoC prototype made by low-cost all-analog/all-passive devices along the signal path. This setup demonstrates experimentally the feasibility of the proposed analog relaying of MIMO RF signals over LAN cables up to 400 MHz, thus enabling an efficient exploitation of the LAN cables transport capabilities for 5G indoor applications. A. Matera, M. Donati and U. Spagnolini are with DEIB, Politecnico di Milano

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

Cited by 9 publications

References 39 publications

Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

Analog MIMO RoC Passive Relay for Indoor Deployments of Wireless Networks

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

Analog MIMO Radio-over-Copper: Prototype and Preliminary Experimental Results

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