Antonio Ramirez

Millimeter wave wireless system based on point to multipoint transmissions

The continuously growing traffic demand has motivated the exploration of underutilized millimeter wave frequency spectrum for future mobile broadband communication networks. Research activities focus mainly on the use of the V-band (59 - 64 GHz) and E-band (71 - 76 & 81 - 84 GHz) to offer multi-gigabit point to point transmissions. This paper describes an innovative W-band (92-95 GHz) point to multipoint wireless network for high capacity access and backhaul applications. Point to multipoint wireless networks suffer from limited RF power available. The proposed network is based on a high power, wide band traveling wave tube of new generation and an affordable high performance transceiver. These new devices enable a new transmission paradigm and overcome the relevant technological challenges imposed by the high atmosphere attenuation and the presently lack of power amplification required to provide adequate coverage at millimeter waves.

Radio-over-Fiber Multi-service MM-Wave Interconnection with Photonic Up-conversion, Dual Band Remote Delivery and Photonic Envelop Detection

A broadband radio-over-fiber architecture with dual-band remote delivery capabilities based on photonic up-conversion and envelop detection for wireless and wireline multi-service transmission is proposed. The architecture has been experimentally demonstrated for Gigabit-Ethernet wireless LAN interconnection employing millimeter-wave point-to-point radio links. Moreover, the simultaneous transmission of digital base-band data and intermediate-frequency signals has been analytically investigated

W-band TWTs for new generation high capacity wireless networks

The congestion of the spectrum actually devoted to wireless networks has stimulated the exploitation of the wide availability of frequencies in the millimeter wave range. The high atmospheric attenuation and the strong detrimental rain effect require level of power not available by solid state power amplifiers typically used at microwave frequency. The lack of power has so far limited the use of millimeter wave range. The massive use of Traveling Wave Tubes as power amplifier in high capacity wireless networks will be the breakthrough in the development of the future millimeter wave network fundamental for the 5G development. The H2020 TWEETHER project aims at a new wireless network concept based on TWTs to distribute data in the millimeter wave portion of the spectrum.

Horizon 2020 TWEETHER project for W-band high data rate wireless communications

The outstanding demand of high data rate in wireless network is exceeding the actual capacity making the microwave region of the spectrum inadequate for the future needs. The millimeter wave region has been demonstrated suitable for multi-gigabit transmission. Unfortunately, technological issues still prevent its adequate exploitation. The Horizon 2020 TWEETHER project “Traveling wave tube for W-band wireless networks with high data rate distribution, spectrum and energy efficiency” aims to respond to this challenge. A novel W-band traveling wave tube will be the core of the system.

Full-duplex Wireless GbE Field Trial Employing Radio-over-Fiber Technologies

A full-duplex radio-over fiber system for the transmission of Gigabit Ethernet signals in the mm-wave band has been demonstrated under a field trial, providing redundant connections and point-to-point wireless extension of optical GbE networks.

TWEETHER future generation W-band backhaul and access network technology

Point to multipoint (PmP) distribution at millimeter wave is a frontier so far not yet crossed due to the formidable technological challenge that the high atmospheric attenuation poses. The transmission power at level of tens of Watts required at millimeter wave for a reference range of 1 km is not available by any commercial or laboratory solid state devices. However, the availability of PmP with multigigabit data rate is pivotal for the new high density small cell networks for 4G and 5G and to solve the digital divide in areas where fiber is not convenient or possible to be deployed. In this paper, the advancements of the novel approach proposed by the EU Horizon 2020 TWEETHER project to create the first and fastest outdoor W-band (92 – 95 GHz) PmP wireless network are described. For the first time a new generation W-band traveling wave tube high power amplifier is introduced in the transmission hub to provide the enabling power for a wide area distribution.

TWEETHER project for W-band wireless networks

The European Horizon 2020 project TWEETHER aims to make a breakthrough in wireless networks to overcome the congestion of the actual mobile networks and foster the new 5G networks. A European Consortium including four universities and five companies from four European countries is devoting a relevant effort to realize novel terminals and transmission hubs to operate in the W-band (93–95 GHz). This paper will describe the advancement of the project.