Estimation of Timing Offsets and Phase Shifts between Packet Replicas in MARSALA Random Access

Zidane, Karine; Lacan, Jérôme; Gineste, Mathieu; Bes, Caroline; Deramecourt, Arnaud; Dervin, Mathieu

doi:10.1109/glocom.2016.7841823

Cited by 5 publications

(12 citation statements)

References 11 publications

(15 reference statements)

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“…the reference packet. Then, both replicas with coherent carrier phase are used as inputs to the timing difference recovery subsystem . After that, they are combined using maximum ratio combining (MRC).…”

Section: Cpe For Marsalamentioning

confidence: 99%

“…The PER is computed via simulations assuming a varying value ofÊ s N 0 until PER targ is reached. The figure of merit Γ is computed as shown in (24), and the optimal values of pilots overhead and lengths are obtained according to (26). It is remarked that the approximation as AWGN approximation for the colliding packets was shown to be accurate in appendix B of del Rio Herrero and De Gaudenzi.…”

Section: Pilots Optimization For Low Baud Ratesmentioning

confidence: 99%

“…Then, both replicas with coherent carrier phase are used as inputs to the timing difference recovery subsystem. 26 After that, they are combined using maximum ratio combining (MRC). The DA ML FF algorithm is applied on the combined signal in order to estimate the timing offset relative to the packet on the reference time slot.…”

Section: Cpe Before Replicas Combiningmentioning

confidence: 99%

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Phase noise impact on the performance of contention resolution slotted random access schemes

Zidane

Gaudenzi

Alagha

et al. 2019

Satell Commun Network

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Summary Cost‐effective satellite terminals (STs) that are designed for a large scale deployment in the Internet of things (IoT) applications are constrained by consumer‐grade local oscillators (LOs) to lower the costs, on the one hand, and by limited equivalent isotropic radiated power (EIRP) due to limited peak transmit power and/or low antenna gain, on the other hand. To close the link budget with the low EIRP constraint, STs can resort to adopting robust forward error correcting (FEC) schemes and/or limiting the transmission baud rate, hence increasing the link margin with respect to the required receiver threshold. In general, the LOs at the terminal side are responsible for injecting multiplicative phase distortions to the transmitted signal, known as phase noise (PN). The PN caused by low‐cost LOs could be significant, especially for low baud rates, thus affecting the demodulator performance. Random access (RA) techniques are particularly encouraged on the return link in networks with low‐cost terminals and bursty/low‐duty cycle types of traffic. The state‐of‐the‐art time‐slotted RA techniques are often evaluated considering high EIRP at the terminal side and high baud rates. This paper investigates the impact of the PN in time‐slotted RA techniques and optimizes different carrier phase estimation (CPE) algorithms. Furthermore, it evaluates the impact of CPE errors on RA performance for a wide range of baud rates and typical STs phase noise masks.

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Section: Cpe For Marsalamentioning

confidence: 99%

Section: Pilots Optimization For Low Baud Ratesmentioning

confidence: 99%

Section: Cpe Before Replicas Combiningmentioning

confidence: 99%

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Phase noise impact on the performance of contention resolution slotted random access schemes

Zidane

Gaudenzi

Alagha

et al. 2019

Satell Commun Network

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“…It consequently offers better PLR and throughput, but in return, it adds a processing complexity related to the correlation computation. Signal processing aspects of MARSALA regarding channel estimation and compensation have been investigated in [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Shared Position Technique for Interfered Random Transmissions in Satellite Communications

Zamoum

Lacan

Boucheret

et al. 2018

2018 9th Advanced Satellite Multimedia Systems Conference and the 15th Signal Processing for Space Communications Workshop (ASM

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In this paper we propose a new random access (RA) channel technique for the return link of satellite communications. It concerns slotted transmissions. This proposed method called Shared POsition Technique for Interfered random Transmissions (SPOTiT), is based on a shared knowledge between the receiver and each of the terminals. The shared information is about the time slot locations on which the terminal transmits its replicas as well as the preamble to use. The presented random version of SPOTiT aims to reduce the complexity of replicas localization process of the legacy technique Multireplica Decoding using Correlation based Localisation (MARSALA). It presents a less complex system without degrading performance and with no extra signaling information. Thus, SPOTiT is applied at the same level as MARSALA, i.e. when Contention Resolution Diversity Slotted Aloha (CRDSA) fails in retrieving more packets. This technique combined with CRDSA significantly reduces the number of data localization correlations, while maintaining the same performance as in CRDSA/MARSALA in terms of packet loss ratio and throughput.

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“…When correlation peaks are detected, the replicas are combined to obtain a higher Signal to Noise plus Interference Ratio (SNIR). Moreover, a method to correct the timing offsets and phase shifts between the replicas, and ensure coherent replicas combination has been presented in [12].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of MARSALA random access with coding schemes, power distributions and maximum ratio combining

Zidane

Lacan²,

Ginestex

et al. 2016

2016 8th Advanced Satellite Multimedia Systems Conference and the 14th Signal Processing for Space Communications Workshop (ASM

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Several random access (RA) techniques have been proposed recently for the satellite return link. The main objective of these techniques is to resolve packets collisions in order to enhance the limited throughput of traditional RA schemes. In this context, Multi-Replica Decoding using Correlation based Localisation (MARSALA) has been introduced and has shown good performance with DVB-RCS2 coding scheme and equi-powered transmissions. However, it has been shown in the literature that alternative coding schemes and packets power distributions can have a positive impact on RA performance. Therefore, in this paper, we investigate the behaviour of MARSALA with various coding schemes and various packet power distributions, then we propose a configuration for optimal performance. This paper also introduces the enhancement of MARSALA RA scheme by adding MRC to optimize replicas combination and study the impact on the throughput. We compare two different MRC techniques and we evaluate, via simulations, the gain achieved using MRC with different coding schemes and unbalanced packets. The simulation results demonstrate that the proposed enhancements to MARSALA show substantial performance gain, i.e. throughput achieved for a target Packet Loss Ratio (PLR).

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Estimation of Timing Offsets and Phase Shifts between Packet Replicas in MARSALA Random Access

Cited by 5 publications

References 11 publications

Phase noise impact on the performance of contention resolution slotted random access schemes

Phase noise impact on the performance of contention resolution slotted random access schemes

Shared Position Technique for Interfered Random Transmissions in Satellite Communications

Enhancement of MARSALA random access with coding schemes, power distributions and maximum ratio combining

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