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Multibeam satellite systems have been employed to provide interactivebroadband services to geographical areas under-served by terrestrialinfrastructure. In this context, this paper studies joint multiuser linearprecoding design in the forward link of fixed multibeam satellite systems. Weprovide a generic optimization framework for linear precoding design to handleany objective functions of data rate with general linear and nonlinear powerconstraints. To achieve this, an iterative algorithm which optimizes theprecoding vectors and power allocation alternatingly is proposed and mostimportantly, the proposed algorithm is proved to always converge. The proposedoptimization algorithm is also applicable to nonlinear dirty paper coding. Inaddition, the aforementioned problems and algorithms are extended to the casethat each terminal has multiple co-polarization or dual-polarization antennas.Simulation results demonstrate substantial performance improvement of theproposed schemes over conventional multibeam satellite systems, zero-forcingand regularized zero-forcing precoding schemes in terms of meeting the trafficdemand. The performance of the proposed linear precoding scheme is also shownto be very close to the dirty paper coding.

Generic Optimization of Linear Precoding in Multibeam Satellite Systems