Papers by Francesc Coromina
22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 (ICSSC), 2004
The use of adaptive digital beamforming techniques has, until recently, been largely restricted t... more The use of adaptive digital beamforming techniques has, until recently, been largely restricted to high performance military radar systems. Recent advances in digital technology, however, have enabled the design of single chip digital beamforming networks. This, coupled with advances in digital signal processor technology, enables complete beamforming systems to be constructed at a lower cost, thus making the application of these techniques to commercial communications systems attractive. The design and development of such an adaptative digital beamforming network are described. The system is being developed as a proof of concept laboratory based demonstrator to enable the feasibility of adaptive digital beamforming techniques for communication systems to be determined. Ultimately, digital beamforming could be used in conjunction with large array antennas for communication satellite systems. This will enable the simultaneous steering of high gain antenna beams in the direction of gr...
Recent advances in digital technology, have enabled the design of single chip digital beamforming... more Recent advances in digital technology, have enabled the design of single chip digital beamforming networks. This, coupled with advances in digital signal processor technology, enables complete beamforming systems to be constructed at a lower cost, thus making the application of these techniques to commercial communications systems attractive. The authors describe the design and development of such an adaptive digital beamforming network by ERA Technology for the European Space Agency. The system is being developed as a proof of concept laboratory-based demonstrator to enable the feasibility of adaptive digital beamforming techniques for communication systems to be determined. Ultimately, digital beamforming could be used in conjunction with large array antennas for communication satellite systems
Space programs are highly dependant on active microwave technologies. This paper will highlight t... more Space programs are highly dependant on active microwave technologies. This paper will highlight the applications where these technologies play a fundamental role, pointing our strength and weakness. Special focus will be made on the European Satellite Navigation Program GALILEO.
22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 (ICSSC), 2004
1996 IEEE MTT-S International Microwave Symposium Digest, 1996
A new concept for the implementation of complex RF beamforming networks (BFN) based on Microwave ... more A new concept for the implementation of complex RF beamforming networks (BFN) based on Microwave MultiChip Module (MMCM) technology, including MMICs and 3D multilayer structure is presented. Its validity is fully demonstrated by the fabrication and characterization of a S-Band 9×9 beamformer using low cost, low mass space qualifiable processes and exhibiting remarkable RF performances
Mobile and Personal Satellite Communications 2, 1996
ABSTRACT First Page of the Article
25th AIAA International Communications Satellite Systems Conference (organized by APSCC), 2007
15th International Communicatons Satellite Systems Conference and Exhibit, 1994
2012 IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012
26th European Microwave Conference, 1996, 1996
Two low phase-noise tunable oscillators were realised using magnetostatic wave (MSW) resonators. ... more Two low phase-noise tunable oscillators were realised using magnetostatic wave (MSW) resonators. Operating ranges are 6.25-12.5 GHz and 9.875-11 GHz. Spurious oscillation at half the output frequency (f/2 bifurcation) is a typical source of phase-noise degradation but can be prevented by insertion of dissipative elements to selectively absorb f/2. Degradation of phase-noise caused by the strong non-linear (chaotic) behaviour of
31st AIAA International Communications Satellite Systems Conference, 2013
25th AIAA International Communications Satellite Systems Conference (organized by APSCC), 2007
20th AIAA International Communication Satellite Systems Conference and Exhibit, 2002
The scope of the present paper is to outline ESA's R&D directions for the development of new tech... more The scope of the present paper is to outline ESA's R&D directions for the development of new technologies required for future broadband satellite communication systems. The document outlines likely trends and technological issues that will need to be tackled in the medium and long term (e.g. 5 to 10 years) to improve by more than one order of magnitude satellite communication networks efficiency, thus increasing their economical appeal. It is shown that by timely developing in a co-ordinated fashion a number of techniques and technologies encompassing both ground and space segment it is possible to attain the ambitious target set forth above.
26th International Communications Satellite Systems Conference (ICSSC), 2008
2008 IEEE International Vacuum Electronics Conference, 2008
Reconfigurability of the RF power among different beams and channels is of primary interest in co... more Reconfigurability of the RF power among different beams and channels is of primary interest in communications satellite systems for its potentiality in maximizing the payload bandwidth and power utilization over the satellite lifetime. The performance of reconfigurable payloads strictly depends on the architecture of the high-power section. We will compare two multi-amplifier architectures, one based on bias-adjustable Traveling-wave Tubes, the
IVEC 2012, 2012
In order to support the deployment of satellite broadband services able to satisfy the growing ne... more In order to support the deployment of satellite broadband services able to satisfy the growing need for broadcast interactive applications, future broadband telecommunication satellites will have to exploit frequencies beyond Ka-band. This entails new key challenges and the use of critical techniques and technologies, which will be discussed.
IVEC 2012, 2012
This paper presents a preliminary system analysis carried out in order to understand, from a syst... more This paper presents a preliminary system analysis carried out in order to understand, from a system perspective, which technologies, communication techniques and resources will be required to achieve the challenging goal of developing a Terabit/s satellite system in the 2020 time horizon.
2010 IEEE International Vacuum Electronics Conference (IVEC), 2010
The paper describes possible key challenges and critical techniques and technologies for broadban... more The paper describes possible key challenges and critical techniques and technologies for broadband satellite communications which in the authors' opinion show enough potential to justify their development in the coming years.
IET Conference Publications, 2009
In this paper we intend to complement the information contained in the companion paper [1] dealin... more In this paper we intend to complement the information contained in the companion paper [1] dealing with broadband fixed communications with possible scenarios of development for future mobile satcom networks, including the underlying key challenges as well as critical techniques and technologies to be developed in the coming years.
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Papers by Francesc Coromina