Linear Time-Packing Detectors for Optical Feeder Link in High Throughput Satellite Systems

Bas, Joan; Dowhuszko, Alexis A.

doi:10.23919/gc-eleceng48342.2020.9286272

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…The optimal strategy for cancelling this unwanted ISI consists in resorting the Maximum-Likelihood Sequence Decoding (MLSD) [34], which can be implemented efficiently with the Viterbi algorithm [35]. However, to increase the throughput of the optical feeder link, it is necessary use a low roll-off factor and large overlapping factor, two things that increase notably the complexity of the Viterbi Algorithm to be implemented in the satellite [27]. Due to the impracticability of this solution, alternative strategies should be considered.…”

Section: Equalization Of the Time-packed Signalmentioning

confidence: 99%

“…Moreover, if time-packing encoding is applied on the real-valued electrical signal that is used to modulate the intensity of the LD beam, the data throughput of the optical feeder link can be increased even further, without the necessity of using a wider communication bandwidth. This effect is obtained by shrinking the separation between adjacent transmitted pulses [26], mitigating part of the Inter-Symbol Interference (ISI) power that time-packing introduces with the aid of a linear equalizer that is placed on-board the GEO satellite before symbol detection [27]. It is important to highlight that the impact of the residual ISI, which remains in the forward link after the GEO satellite relaying, can be further mitigated with the proper selection of the Modulation and Coding Schemes (MCS) to communicate with the NB-IoT terminal [28].…”

Section: Introductionmentioning

confidence: 99%

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On the Use of NB-IoT over GEO Satellite Systems with Time-Packed Optical Feeder Links for Over-the-Air Firmware/Software Updates of Machine-Type Terminals

Bas

Dowhuszko

2021

Sensors

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The verticals of 5G, such as the automotive, smart grid, and smart cities sectors, will bring new sensors and IoT devices requiring Internet connectivity. Most of these machine-type terminals will be sparsely distributed, covering a very large geographical area and, from time to time, will have to update their software, firmware, and/or other relevant data. Given this situation, one viable solution to implement the “Over-the-Air” update of these IoT terminals can be done with the aid of GEO satellite systems. However, due to the ultra-dense radio frequency reuse factor that contemporary High-Throughput Satellite (HTS) systems implement in the access link to serve the IoT terminals, the use of a time-packed Free Space Optical (FSO) link represents a practical solution to avoid the bottleneck that the satellite gateway experiences in the feeder link. The performance of both Detect-and-Forward and Decode-and-Forward relaying strategies are studied, assuming that the single-carrier M-PAM symbols that are transmitted on the optical feeder link are mapped into M-QAM symbols that modulate the multiple sub-carriers of the OFDM-based radio access link. In addition, the benefits of encapsulating the NB-IoT frames into DVB-S2(X) satellite frames is also analyzed in detail. The effects of the impairments introduced in both the optical feeder and radio access links are characterized in detail, and the end-to-end error correction capabilities of the Modulation and Coding Schemes (MCS) defined in the contemporary releases of the NB-IoT and DVB-S2(X) standards are studied for different working regimes.

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Section: Equalization Of the Time-packed Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Use of NB-IoT over GEO Satellite Systems with Time-Packed Optical Feeder Links for Over-the-Air Firmware/Software Updates of Machine-Type Terminals

Bas

Dowhuszko

2021

Sensors

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End-to-End Error Control Coding Capability of NB-IoT Transmissions in a GEO Satellite System with Time-Packed Optical Feeder Link

Bas

Dowhuszko

2021

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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This paper focuses on the return link of a GEO satellite system that collects information from a large number of IoT devices that are sparsely distributed in a large geographical area. Narrow-Band (NB) IoT transmissions, with suitable Modulation and Coding Scheme (MCS), are Detected-and-Forwarded onboard the satellite, mapping each QAM symbol of the radio access link (uplink) into another equivalent PAM symbol that is suitable to modulate the intensity of the optical feeder link (downlink). Given the very large number of IoT devices that is expected to be served by the GEO satellite system, the feeder link (downlink) of the return channel is expected to be bottleneck. To tackle this limitation, apart from using an optical feeder link, time-packing is proposed to reduce the transmission time of the feeder link (downlink) without increasing the signal bandwidth and augment the number of IoT devices that could be simultaneously served in the radio access links (uplink). The Inter-Symbol Interference (ISI) that the time-packed feeder link generates is mitigated in part at the satellite gateway, using for this purpose an adaptive linear equalizer. After optical-to-electrical conversion, the NB-IoT codewords that are received in the gateway are decoded, correcting simultaneously errors introduced in both radio access and optical feeder links. The aim of this paper is to evaluate the error correction capability that the MCS of NB-IoT has when used to protect the hybrid radio/optical end-to-end return link, particularly when using a large overlapping factor to increase the optical feeder link data rate.

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Linear Time-Packing Detectors for Optical Feeder Link in High Throughput Satellite Systems

Cited by 2 publications

References 12 publications

On the Use of NB-IoT over GEO Satellite Systems with Time-Packed Optical Feeder Links for Over-the-Air Firmware/Software Updates of Machine-Type Terminals

On the Use of NB-IoT over GEO Satellite Systems with Time-Packed Optical Feeder Links for Over-the-Air Firmware/Software Updates of Machine-Type Terminals

End-to-End Error Control Coding Capability of NB-IoT Transmissions in a GEO Satellite System with Time-Packed Optical Feeder Link

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