Next Generation Waveform for Improved Spectral Efficiency

- Next generation of systems
- Future Preparations
Status: Completed
Last updated: 2015-06-16 00:00:00
Activity Code: 1B.071

Objectives

The purpose of this activity is to study, analyse and simulate new advanced techniques at physical and upper layers (these latter only to support the new devised physical layer techniques) for the forward and return link of future satellite networks, targeting the consumer and professional fixed and mobile terminal market. The goal is to increase the spectral and energy efficiency of the currently used solutions, enable higher data rates for the same link availability, with the end result of increasing the overall competitiveness of the satellite networks. The performance of such techniques shall be thoroughly investigated by means of analysis and computer simulations and their benefits at system level also estimated together with their expected complexity.

Challenges

RG1 has investigated the following techniques:

Time and Frequency Packing
FEC Optimisation (for channels with ISI)
Constant Physical Layer Framing
Pre-coding with “user-clustering”
Interference Cancellation / Multi-User Detection at the Receiver
Higher Order Modulation Schemes

RG2 has investigated the following techniques:

FWD Link Adaptive Transmission
FWD Link Receiver Equalisation
Pre-Distortion at the User Terminal
Random Access Channel Optimisation
RTN Link Multi-User Detection at the Receiver for DAMA
FWD and RTN Link FEC Optimisation

Pre-coding with “user-clustering” was selected as the most promising technology at the end of Task 1, detailed investigation was carried out in Tasks 2 and 3 for the physical layer (in particular synchronisation matters) and system level aspects respectively.

Benefits

Based on the achieved or expected performance improvements, the results of the study will be used to define a roadmap within the ARTES program for the development (including validation) of the corresponding technologies and products.

Many contributions to DVB-S2X standardisation were also realised.

Features

The consortium is organised into two Research Groups (RG) which will carry out parallel investigations during the first phase of the project, namely:

RG1 (DLR, Uni-Bologna, Uni-Parma and PoliTo) will focus on the FWD link of a fixed/mobile broadband system in Ku/Ka-band
RG2 (DLR, CTTC, Uni-Vigo and Uni-Luxembourg) will focus on the FWD and RTN Links of mobile Interactive syste, in L/S-band.

After selecting the most promising technology or subset of technologies, University of Bologna will carry out the detailed physical layer assessment in Task 2 and DLR the system level assessment in Task 3.