Waveform design solutions for EHF broadband satellite communications

Sanctis, Mauro De; Cianca, Ernestina; Rossi, T.; Sacchi, Claudio; Mucchi, Lorenzo; Prasad, Ramjee

doi:10.1109/mcom.2015.7060477

Cited by 52 publications

(22 citation statements)

References 12 publications

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“…The aim of ComEx is to design, optimize, and test adaptive transmission schemes, ie, propagation impairments mitigation techniques (PIMTs), over the Q/V band satellite channel . These techniques play a fundamental role in the effective exploitation of EHF band for satellite communications …”

Section: The Alphasat “Aldo Paraboni” Experimentsmentioning

confidence: 99%

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The role of the Italian Space Agency in investigating high frequencies for satellite communications: The Alphasat experiment

Codispoti

Parca

Ruggieri

et al. 2018

Satell Commun Network

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Summary Since the 1970s, satellite communications have been continuously evolving and improving to provide services characterized by increasing complexity and quality. This evolution has been supported by the constant increase in the operating frequency for achieving the necessary high data rates. This contribution focuses on the long‐term key role of the Italian Space Agency in supporting research activities on (and the developments of) high‐frequency satellite communication systems. The Alphasat experiment is the most recent effort of the Italian Space Agency, in collaboration with the European Space Agency, to thoroughly investigate the severe detrimental atmospheric effects impairing radio waves at high frequency (specifically, Ka and Q bands) and the associated fade mitigation techniques (eg, uplink power control, site diversity, and adaptive coding and modulation) required to achieve the typical target quality and availability of modern satellite communication systems.

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Section: The Alphasat “Aldo Paraboni” Experimentsmentioning

confidence: 99%

“…18 These techniques play a fundamental role in the effective exploitation of EHF band for satellite communications. [19][20][21] The The ComEx payload transponder can be configured by using 1 of the following 2 modes:…”

Section: The Q-/v-band Communication Experiment: Comexmentioning

confidence: 99%

The role of the Italian Space Agency in investigating high frequencies for satellite communications: The Alphasat experiment

Codispoti

Parca

Ruggieri

et al. 2018

Satell Commun Network

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“…To achieve very high throughput towards "terabit connectivity," bandwidth efficient modulation schemes have to be used [4], [5]. However, because there is a trade-off between bandwidth efficiency and power efficiency in modulation schemes, high bandwidth efficiency requires more transmission power that is a limited resource in satellite systems.…”

Section: Introductionmentioning

confidence: 99%

Satellite communication and propagation experiments through the alphasat Q/V band Aldo Paraboni technology demonstration payload

Rossi

Sanctis

Ruggieri

et al. 2016

IEEE Aerosp. Electron. Syst. Mag.

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INTRODUCTIONCurrent high-throughput satellite (HTS) systems for broadbanddistributed user access are designed following two main concepts: C The use of Ka band radio frequency (RF) links both for the forward and for the return link; this choice is due to the congestion of lower frequency bands and to the relatively large bandwidth available in the Ka band. Moreover, the RF technology in the Ka band is mature [1], [2].C The use of multispot coverage: this technique is largely applied to increase the system throughput through frequency reuse and system reconfigurability [2], [3].HTS systems are dimensioned to support an aggregated total capacity (considering both forward and return links) of a tenth of a gigabit per second over a coverage area as large as Europe, with a single spot capacity of hundreds of megabits per second [3].As a matter of fact, HTSs still offer much less bandwidth per user with respect to the terrestrial broadband networks. To achieve very high throughput towards "terabit connectivity," bandwidth efficient modulation schemes have to be used [4], [5]. However, because there is a trade-off between bandwidth efficiency and power efficiency in modulation schemes, high bandwidth efficiency requires more transmission power that is a limited resource in satellite systems.Therefore, an important breakthrough is needed in terms of bandwidth availability. The Q/V band (40-50 GHz) seems to offer very promising perspectives, being unused for commercial systems and offering a large part of the spectrum allocated for satellite services [1]. In this frame, the medium-term HTS system architecture is based on the use of a Ka-band user link to maintain the user terminal compatibility with the current system and a Q/V band feeder link [4]- [7].This solution is particularly attractive for the following reasons:C The Q/V band spectrum allocated for fixed satellite service is very large, about 5 GHz of near-continuous bandwidth both for uplink and downlink.C The whole Ka-band spectrum (that is currently allocated both for feeder and user links of the HTS systems) will be available for user link, increasing the bandwidth allocated to the user segment. This will require a rethinking of International Telecommunication Union frequency allocation and a strong frequency coordination activity.It is well-known that the atmospheric propagation impairments at extremely high frequency (EHF) bands (30-300 GHz) are severe, not only when rain events occur but also in the presence of clouds. The EHF electromagnetic radiation that propagates through the atmosphere is subject to absorption, scattering, depolarization, and fast fluctuations of amplitude and phase (scintillation) that have to be carefully investigated. Moreover, some mitigation techniques have to be analyzed and properly tuned to realize an efficient transmission. To counteract rain fading effects, high static link margins can be considered to ensure a minimum service outage duration. However, setting large link margins is in contrast with technology limitations of s...

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“…The use of multicarrier modulations in satellite communications has been extensively studied [2][3][4][5]. While OFDM is clearly advantaged against single-carrier modulations for broadband transmission over frequency-selective multipath satellite channels [2], SC-FDMA, thanks to its multipath resilience due to efficiency of FDE, has been proposed as an alternative promising solution to High-Speed Uplink Packet Access (HSUPA) for enhanced S-UMTS return channel [3].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the adoption of an OFDM-based radio interface for the satellite part of a hybrid terrestrial-satellite system could reduce terminal complexity. It is for this reason that OFDM has been adopted for DVB-SH with proper modifications [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis and assessment of the effects of phase noise in constant envelope multicarrier satellite transmissions

Sacchi

Cianca

Rossi

et al. 2015

2015 IEEE International Conference on Communications (ICC)

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Constant-Envelope (CE) multicarrier techniqueshave been recently proposed in order to enable the use of multicarrier waveforms in channels characterized by severe nonlinear distortions. They are based on a phase modulation applied to the multicarrier signal, generated in the time domain by means of a real-valued DFT. Such techniques, known as CE-OFDM and CE-SC-FDMA, demonstrated their superior performance with respect to conventional OFDMA and SC-FDMA, when applied to nonlinear satellite channels, at the price of reduced spectral efficiency. An open issue still to be evaluated is related to the impact of phase noise on the performance of CE multicarrier systems. This is especially important in view of the use of EHF bands for broadband satellite communications. This paper aims at analyzing the effects of phase noise on CE-OFDM and CE-SC-FDMA, highlighting the different behavior of conventional and CE multicarrier signals in the presence of such impairment. Then, simulation results will be discussed considering two different phase noise masks. The performed analysis demonstrates that CE multicarrier signals have globally better performance when both phase noise and nonlinear distortions are considered. Moreover, the sensitivity to the phase noise is strongly dependent from the modulation order and the angular modulation index.

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Waveform design solutions for EHF broadband satellite communications

Cited by 52 publications

References 12 publications

The role of the Italian Space Agency in investigating high frequencies for satellite communications: The Alphasat experiment

The role of the Italian Space Agency in investigating high frequencies for satellite communications: The Alphasat experiment

Satellite communication and propagation experiments through the alphasat Q/V band Aldo Paraboni technology demonstration payload

Analysis and assessment of the effects of phase noise in constant envelope multicarrier satellite transmissions

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