Adaptive coding and modulation for satellite broadband networks: From theory to practice

Bischl, H.; Brandt, Hartmut; Cola, Tomaso de; Gaudenzi, R. De; Eberlein, Ernst; Girault, Nicolas; Alberty, Eric; Lipp, Stefan; Rinaldo, Rita; Rislow, B.; Skard, John Arthur; Tousch, Jacky; Ulbricht, Gerald

doi:10.1002/sat.932

Cited by 50 publications

(50 citation statements)

References 12 publications

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“…This design produces complex modulation/coding schemes because of the frequent switchover of modulation and code rate [3,4]. The novel method requires, as the current ACM techniques, a fixed transmitter power, but larger than that adopted in clear-sky conditions, and, differently than traditional ACM, a variable symbol rate (which can incorporate a variable symbol rate due to the source of information or coding, besides that due to A(t)), which translates, proportionally, into a variable symbol rate for QPSK.…”

Section: Power and Bandwidthmentioning

confidence: 99%

A method to achieve clear-sky data-volume download in satellite links affected by tropospheric attenuation

Matricciani

2015

Int. J. Satell. Commun. Network.

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SUMMARYFor data downloading from satellites, the traditional approach of considering the complementary probability distribution, P(A trop ) of the total tropospheric attenuation A trop (dB), at a frequency, polarization, and elevation angle, may be too pessimistic, and it may lead to large overdesign. If the data volume downloaded in a given observation time T obs (a day, a week, a month, etc.), with a constant probability of symbol error, is more valuable than the instantaneous symbol, or bit rate (as it may be the case in Earth resources observation or in other services that allow long delays in communicating data), another approach can avoid overdesign, namely the various adaptive coding and modulation techniques. We study a particular time integral of A trop (t): (i) to define the average efficiency of a radio channel faded by the troposphere and (ii) to design a method that can theoretically achieve the same volume of data downloaded in clear-sky conditions (no troposphere), even if the radio link is faded by the troposphere. The average efficiency and its bounds can be calculated from the complementary probability distribution of A trop (t). We explicitly apply the theory to radio links faded by rain, by using the experimental rain-attenuation time series measured with satellite ITALSAT in a 37.8°slant path, at 18.7, 39.6, and 49.5 GHz at Spino d'Adda (Italy), and to those simulated with the synthetic storm technique. Based on the average efficiency, we define the method that can achieve in T obs , theoretically, the same data volume as in clear sky, directly applicable to quadrature phase-shift keying, multiple phase-shift keying, and Shannon capacity theorem. The method requires a fixed increase in power margin, and bandwidth, compared with clear-sky conditions, and delivers an average symbol rate equal to the maximum symbol rate obtainable when A trop (t) = 0. The method can also be used in terrestrial links at any frequency. We compare its theoretical performance with the traditional adaptive coding and modulation techniques and show that, even theoretically, these techniques cannot achieve unitary efficiency as, on the contrary, the novel method can do. Real-time satellite communications at frequencies above 10 GHz are characterized with the long-term probability distribution, P(A trop ), of total tropospheric attenuation A trop (dB) (a combination of attenuation due to rain, hail, snow, mist, water vapor, clouds, and oxygen), at a frequency, polarization, and elevation angle. This P(A trop ) refers to an average year, or to a shorter observation period, T obs , for example, a month, and is useful to calculate link budget and to assess link availability. The same approach holds for second-order statistics, such as fade duration and time derivative of fade (rate of change), which describe fading dynamics, especially with regard to rain attenuation, the most rapidly changing and less predictable tropospheric fade in slant paths. Fade duration statistics give information on the duration of continuous out...

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Section: Power and Bandwidthmentioning

confidence: 99%

A method to achieve clear-sky data-volume download in satellite links affected by tropospheric attenuation

Matricciani

2015

Int. J. Satell. Commun. Network.

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“…In the case of non-equiprobable constellation points, which has not been considered so far in any of the APSK related standards [DVB-S2, 2005;DVB-SH, 2007;GMR-1 3G, 2008;IPoS, 2006;Yuhai Shi et al, 2008], shaping of M-APSK constellations is examined here in order to achieve the so called "shaping gain" [Calderbank & Ozarow, 1990;Forney & Wei, 1989]. To this end, assuming equiprobable constellation points on each -th ring which allows different a priori probabilities on different rings, a new APSK constellation design optimization problem is formulated and numerically solved in order to calculate the a priori probabilities of constellation points on each -th ring and also to calculate the corresponding shaping gain.…”

Section: Non-equiprobable Constellation Optimizationmentioning

confidence: 99%

“…The main idea behind constellation shaping is that signals with large norm are used less frequently than signals with small norm, thus improving the overall gain by adding shaping gain to the original coding gain. Theoretically, when constellation points are selected according to a continuous Gaussian distribution at every dimension, the maximum achievable shaping gain in the limit for infinite transmission rates is 1.53 dB [Calderbank & Ozarow, 1990;Forney & Wei, 1989]. Practically, a smaller shaping gain can be achieved in finite constellations as is the case in M-APSK constellations.…”

Section: Non-equiprobable Constellation Optimizationmentioning

confidence: 99%

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Amplitude Phase Shift Keying Constellation Design and its Applications to Satellite Digital Video Broadcasting

Liolis¹,

Gaudenzi²,

Alagha³

et al. 2010

Digital Video

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“…This limitation makes it difficult for a satellite communication system to compete with terrestrial service, and thus satellite operators should utilize a transponder more effectively. DVB-S2 ACM for the forward link in two-way satellite systems using DVB-RCS can be used to improve the system throughput, link availability, and bandwidth efficiency [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Proposal of an Algorithm for an Efficient Forward Link Adaptive Coding and Modulation System for Satellite Communication

Ryu¹,

Oh²,

Kim

et al. 2016

Journal of electromagnetic engineering and science

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This paper proposes the algorithm for forward link adaptive coding and modulation (ACM) and the detailed design for a satellite communication system to improve network reliability and system throughput. In the ACM scheme, the coding and modulation schemes are changed by as much as the channel can provide depending on the quality of the communication link. To implement the forward link ACM system in the Ka-band, channel prediction and modulation/coding decision methods are proposed and simulated. The parameters of the adaptive filter predictor based on the least mean square are optimized, the minimum mean square error of the channel predictor is 0.0608 when step size and the number of filter tap are 0.0001 and 4, respectively. A test-bed is set up to verify the forward link ACM system, and a test is performed using a Ka-band satellite (i.e., Communication, Ocean, and Meteorological Satellite [COMS]). This test verifies that the ACM scheme can increase the system throughput. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Adaptive coding and modulation for satellite broadband networks: From theory to practice

Cited by 50 publications

References 12 publications

A method to achieve clear-sky data-volume download in satellite links affected by tropospheric attenuation

A method to achieve clear-sky data-volume download in satellite links affected by tropospheric attenuation

Amplitude Phase Shift Keying Constellation Design and its Applications to Satellite Digital Video Broadcasting

Proposal of an Algorithm for an Efficient Forward Link Adaptive Coding and Modulation System for Satellite Communication

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