Abstract
This paper deals with interference cancellation techniques to mitigate cochannel interference on the reverse link of multibeam satellite communication systems. The considered system takes as a starting point the DVB-RCS standard with the use of convolutional coding. The considered algorithm consists of an iterative parallel interference cancellation scheme which includes estimation of beamforming coefficients. This algorithm is first derived in the case of a symbol asynchronous channel with time-invariant carrier phases. The aim of this article is then to study possible extensions of this algorithm to the case of frequency offsets affecting user terminals. The two main approaches evaluated and discussed here are based on (1) the use of block processing for estimation of beamforming coefficients in order to follow carrier phase variations and (2) the use of single-user frequency offset estimations.
Highlights
This paper deals with interference cancellation techniques to mitigate cochannel interference on the reverse link of multibeam satellite communication systems
Multiuser detection appears as a promising way to mitigate cochannel interference (CCI) on the reverse link of multibeam satellite systems
The algorithm is derived for a symbol-asynchronous time-invariant channel [1]. It basically consists of a parallel interference cancellation (PIC) scheme which uses hard decisions provided by single user Viterbi decoders, and includes channel reestimation
Summary
Multiuser detection appears as a promising way to mitigate cochannel interference (CCI) on the reverse link of multibeam satellite systems. It can allow considering more capacity efficient frequency reuse strategies than classical systems (in which cochannel interference is assimilated to additive noise). This paper proposes a multiuser detection scheme coupled with channel reestimations. The algorithm is derived for a symbol-asynchronous time-invariant channel [1]. It basically consists of a parallel interference cancellation (PIC) scheme which uses hard decisions provided by single user Viterbi decoders, and includes channel reestimation. The aim of this paper is to propose results on possible adaptations of this algorithm to the more realistic case of frequency offsets affecting user terminals
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