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ROIMUS

In the forward-link of broadband satellite systems with multiple beams, Co-Channel Interference (CCI) can severely affect simultaneous transmissions at equal frequency to users located in different beams. Eliminating the CCI at the receiver, e.g., by an iterative cancellation approach, strongly increases the receiver complexity and cost. Therefore, much effort has been made to cancel the CCI at the cost-insensitive transmitter side (at the gateway), e.g. by Dirty Paper Coding or Tomlinson-Harashima Precoding.

For the return-link, Successive Interference Cancellation (SIC) could be used at the gateway. In this respect novel resource management algorithms have to be designed to better exploit the new characteristics and the improved performance of the physical layer.

In the project, two directions are considered:

1. The multi-beam transmission is kept and a design based on the joint optimization of the physical layer and the scheduler is performed, where the scheduler allocates the time-frequency slots to the different users located in the different beams. Additionally, practically implementable physical layer techniques and new suboptimal solutions capable of dealing with a large number of users will be developed. The interference management investigations for the forward and return-link will be performed both for static and mobile users.
2. The restriction to a multi-beam transmission is eliminated and the optimal solution to the joint optimization of the advanced physical layer and the scheduler will be obtained based on a dual decomposition.

• ROIMUS

  Project Goals
  • QoS Optimization for Satellite Communications by Dual Decomposition
  • Robust Precoding with Rank-One Constraints
  • Forward-Link Interference Management for Static Users
  • Return-Link Interference Management for Static Users
  • Forward-Link Interference Management for Mobile Users
  • Return-Link Interference Management for Mobile Users