Space-frequency to space-frequency for MIMO radio over copper

Kassab

Simeone

et al. 2018

Entropy

Self Cite

This paper considers the coexistence of Ultra Reliable Low Latency Communications (URLLC) and enhanced Mobile BroadBand (eMBB) services in the uplink of Cloud Radio Access Network (C-RAN) architecture based on the relaying of radio signals over analog fronthaul links. While Orthogonal Multiple Access (OMA) to the radio resources enables the isolation and the separate design of different 5G services, Non-Orthogonal Multiple Access (NOMA) can enhance the system performance by sharing wireless and fronthaul resources. This paper provides an information-theoretic perspective in the performance of URLLC and eMBB traffic under both OMA and NOMA. The analysis focuses on standard cellular models with additive Gaussian noise links and a finite inter-cell interference span, and it accounts for different decoding strategies such as puncturing, Treating Interference as Noise (TIN) and Successive Interference Cancellation (SIC). Numerical results demonstrate that, for the considered analog fronthauling C-RAN architecture, NOMA achieves higher eMBB rates with respect to OMA, while guaranteeing reliable low-rate URLLC communication with minimal access latency. Moreover, NOMA under SIC is seen to achieve the best performance, while, unlike the case with digital capacity-constrained fronthaul links, TIN always outperforms puncturing.

Section: C-ran Based On Analog Radio-over-x Fronthaulingmentioning

confidence: 99%

Section: Radio Resource Mapping Over Fronthaul Channelsmentioning

confidence: 99%

Non-Orthogonal eMBB-URLLC Radio Access for Cloud Radio Access Networks with Analog Fronthauling

Kassab

Simeone

et al. 2018

Entropy

Self Cite

“…Previous works [8,11]- [15] proved the effectiveness of A-MIMO-RoC in terms of equivalent wireless capacity by numerical analysis, however, an experimental validation of the A-MIMO-RoC architecture is still missing, and this is the focus of this paper. It is worth mentioning that the proposed A-MIMO-RoC platform is also suitable in antenna remotization scenarios for indoor WLAN applications where the cost of CPRI interfaces cannot be afforded.…”

Section: Introductionmentioning

confidence: 99%

“…MHz bandwidth/pair (2 GHz bandwidth overall) [8,11]- [15]. Simulation results demonstrated that, in principle, a single 100-m Cat-6 LAN cable is capable to serve up to 60 RRU antennas each carrying a 20-MHz LTE signal, achieving up to 10 Gbps equivalent wireless data-rate [8].…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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

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

Rampa

Donati

et al. 2019

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

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

Special Topics in Information Technology

2019

Self Cite

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.