Enhanced spread spectrum aloha demodulator implementation, laboratory tests and satellite validation

Andrenacci, Marco; Mendola, Gaetano; Collard, Florian; Finocchiaro, Daniele; Recchia, Annamaria

doi:10.1002/sat.1086

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…, and that we use to evaluate the decoding performance of user k 2 in the second iteration as argument of the bivariate PER. In (17), 2 [k] is the random variable modeling the second decoding attempt for user k, which fails (…”

Section: B the Second Sic Iterationmentioning

confidence: 99%

“…This strategy, in combination with SIC after the bank of single-user matched filters, is precisely that adopted in Enhanced Spread Spectrum ALOHA (E-SSA); users operate uncoordinately since complexity is moved to the iterative SIC ground-based gateway, that resolves packet collisions in a highly effective way when packet-power unbalance is enabled. E-SSA's splendid performance has led to its application for machine-type terminals accessing satellites operating in the S-band [17] or in the C/Ku/Ka-band [18], and also in the return channel of the ANTARES aeronautical communication system. Unveiling the relevance of SIC in the emergent IoRT [19], [20], this work elaborates precisely an original point of view on the energy allocation design, from an energy efficiency perspective, considering short packets and practical features of the iterative SIC receiver.…”

Section: Introductionmentioning

confidence: 99%

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Energy Allocation Design for the Satellite Return Channel of a Massive NOMA System With Interference Cancellation

Molina

Sala-Alvarez

2022

IEEE Trans. on Green Commun. Netw.

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The energy allocation problem in a massive access setting under iterative successive interference cancellation (SIC) is undertaken in this work. The classic one-iteration SIC still has room for improvement when the channel coding schemes adopted are non-error free. In this work, we investigate a satellite return link in which transmitters employ the same physical layer and transmission protocol: a given encoder, and spreading-based nonorthogonal multiple access. Leveraging iterative SIC, the gateway is endowed with strong interference suppression potential to deal with many uncoordinated transmissions. We elaborate on the interplay between energy and reliability for all users by designing an energy allocation with minimum energy expenditure when the iterative SIC receiver performs two decoding attempts per user. We resort to the user-asymptotic regime to address the randomness in the multi-feature system model of two-iteration SIC, which has turned the analysis into a deterministic one. We formulate our final design as a vector optimization aided by tools from the calculus of variations. We show the competitive performance achieved by the designed allocation, specially under encoders associated with short-length codes. We also assess our analysis by simulating a low-level SIC implementation.

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Section: B the Second Sic Iterationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Allocation Design for the Satellite Return Channel of a Massive NOMA System With Interference Cancellation

Molina

Sala-Alvarez

2022

IEEE Trans. on Green Commun. Netw.

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“…Consequently, the European Telecommunications Standards Institute (ETSI) S‐MIM standard has adopted the E‐SSA protocol for the asynchronous access to support satellite mobile messaging and low‐data rate services . The technology maturity of E‐SSA is very high, because several joint ESA/Eutelsat activities related to the design and implementation of the DVB‐SH/S‐MIM standards have fostered the deployment of prototypes and supported extensive validation campaigns in the field .…”

Section: Satellite Systems and Standardsmentioning

confidence: 99%

Random access schemes for satellite networks, from VSAT to M2M: a survey

Gaudenzi

Herrero

Gallinaro

et al. 2016

Satell Commun Network

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Summary In this survey paper, we review the random access (RA) techniques with particular emphasis on the issues and the possible solutions applicable to satellite networks. RA dates back to the 1970s when the ALOHA protocol was developed to solve the problem of interconnecting university computers located in different Hawaiian islands. Since then, several evolutions of the ALOHA protocol have been developed. In particular, solutions were devised to mitigate the problem of packet collisions severely degrading the RA protocols performance. The approach followed for many years has been to avoid the occurrence of collisions rather than solving them. More recently, techniques tackling the RA packet collision problem have appeared triggered by the need of improving RA performance in satellite and terrestrial wireless networks. In particular, satellite networks large propagation delay does not allow the adoption of enhanced terrestrial RA techniques based on channel sensing. Adopting conventional demand assignment multiple access protocols is not suitable for supporting a large number of sensors or devices transmitting small‐size low duty cycle packets as required for machine‐to‐machine communications. This provided the stimulus to exploit successive interference cancelation schemes to solve packet collision issues. The use of successive interference cancelation in RA is relatively new and has opened up a promising research area. We provide an extensive review of recent high‐performance RA techniques achieving more than three orders of magnitude throughput increase compared with the original ALOHA at low packet loss rate. In this survey, we cover both slotted and unslotted techniques. Finally, we review the use of RA in satellite systems and related standards including recent proposals for machine‐to‐machine applications. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The first known implementation of an E-SSA has been reported in [38]. This E-SSA RA demodulator implementation (see Figure 2.19) by the MBI company is based on a Software Defined Radio (SDR) hybrid Graphic Processing Unit/Central Processing Unit (GPU/CPU) platform implementing the S-MIM protocol [38].…”

Section: Unslotted Ra Implementation Aspectsmentioning

confidence: 99%