Message-Splitting for Interference Cancellation in Multibeam Satellite Systems

Abstract

This paper investigates a novel technique to deal with the interference in the forward link of multibeam satellite systems when aggressive frequency reuse schemes are employed. Taking into account only magnitude information about the forward channel, the gateway judiciously splits the messages to be transmitted into private and public parts. At the receive terminals, partial cancellation of the public messages is applied prior to private message detection. The practical significance of the absence of channel phase information is stressed and complemented by some additional insights on the implementation. Our numerical results show that, in terms of average total throughput, this technique combined with a 2-colour frequency reuse scheme can outperform a classic orthogonal system with a conservative 4-colour frequency reuse scheme, despite the additional co-channel interference.

Adjacent Beams Resource Sharing to Serve Hot Spots: A Rate-splitting Approach

“…However, the more modest improvement of the 2-color scheme A can be more significant from a satellite payload complexity point of view. In [3], the 2-color scheme A was simulated in a uniform traffic distribution scenario, with an improvement over the traditional 4-FDM benchmark. Without requiring any change in the frequency of the beams, NCRS is able to provide some improvement for both the uniform and uneven traffic scenario.…”

“…In this paper, a rate-splitting approach has been successfully tested in a Hot-Spot scenario. For this purpose, the work in [2] and [3] has been extended to embrace the Hot-Spot case analyzed in [4]. Since NCRS has been initially designed for a two user case, a simplified scaled version for three and four users has been introduced.…”

“…Inspired by the Generalized Degrees of Freedom(GDoF) framework in [7], NCRS is presented in [2] and [3] to cope with the co-channel interference by using rate-splitting. The transmitters send two kind of messages: private and public.…”

“…The current paper extends the work in [4], by applying rate splitting ideas to a HS scenario with the adoption of aggressive frequency reuse patterns. NCRS has already proved a significant improvement with respect to the 4-color FDM benchmark, achieving up to 20% for low signal-to-noise ratio (SNR) cases in a uniform traffic scenario [3]. Nevertheless, it is yet to be confirmed whether NCRS can present an improvement over the previous techniques for HS.…”

“…the channel strength knowledge, at the cost of increasing the receiver complexity. Under similar partial CSIT constraints, in [2] and [3] a rate-splitting approach named Non-Coherent Rate-Splitting (NCRS) was introduced to cope with the interference of neighboring beams. NCRS splits the messages into private and public components, and performs successive interference cancellation (SIC) at the receive terminals to extract messages that use the same time and frequency resources.…”