Dynamic uplink frame optimization with ACM in DVB-RCS2 satellite networks

Abstract

In current generation of satellite networks, modulation and coding schemes can be dynamically changed in real-time to face different link conditions. Therefore, the link budget is no more required to be computed under the worst-case, with relevant advantages in terms of efficiency. The new DVB-RCS2 standard extends the dynamic modulation and coding to the return link: by using different modulation and coding schemes within the uplink frame, the terminals experiencing good link conditions transmit at very high bitrates, while the terminals experiencing fade events transmit at lower bitrates. This paper addresses the problem of optimizing the uplink frame modulation and coding schemes based on the current link conditions experienced by the terminals and on their transmission capacity requirements. The problem is formulated as an Integer Program and an efficient Linear Program approximation is proposed. Simulation results validate the proposed approach

Robust Nonlinear Attitude Stabilization of a Spacecraft through Digital Implementation of an Immersion & Invariance Stabilizer11This work was supported by the Italian project PLATINO (Grant Agreement nr. PON0101007)

“…A robust attitude stabilizer is necessary for long range communications satellites, especially when a high throughput is involved. The capability of the spacecraft to maintain a fixed orientation despite external disturbances and modeling uncertainties is crucial when dealing with satellite internet access at high data speeds (Pietrabissa and Fiaschetti (2012)). …”

Adaptive modem and interference suppression based on deep learning

“…Adaptive code modulation (ACM) 2 and interference suppression play an important role in the wireless communication systems. Specifically, ACM can achieve a good compromise between capacity and reliability by adapting parameters to the channel condition 3 and has been applied in the cellular communication systems, 4 satellite broadcasting systems, [5][6][7] and optical communication networks. 8,9 However, traditional ACM usually needs amount of hardware and software resources to implement multiple codes and modems with different rates and different orders separately, and then select a certain combination of them to complete the communication according to the perception and decision of the channel environment.…”

Dynamic uplink frame optimization with adaptive coding and modulation in DVB‐RCS2 satellite networks

“…On the basis of the state‐of‐the‐art review, up to the authors' knowledge, the proposed algorithm (preliminary presented in , with a simpler problem formulation where no traffic differentiation was considered) represents the first attempt to optimize the uplink frame structure availing of ACM techniques; furthermore, as analyzed in the following Sections, the proposed procedure is compliant with the new DVB‐RCS2 standard ().…”