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Due to recent advances in laser satellite communications technology,free-space optical (FSO) links are presented as an ideal alternative to theconventional radio frequency (RF) feeder links of the geostationary satellitefor next generation very high throughput satellite (VHTS) systems. In thispaper, we investigate the performance of multibeam VHTS systems that accountfor nonlinear high power amplifiers at the transparent fixed gain satellitetransponder. Specifically, we consider the forward link of such systems, wherethe RF user link is assumed to follow the shadowed Rician model and the FSOfeeder link is modeled by the Gamma-Gamma distribution in the presence of beamwander and pointing errors where it operates under either the intensitymodulation with direct detection or the heterodyne detection. Moreover,zero-forcing precoder is employed to mitigate the effect of inter-beaminterference caused by the aggressive frequency reuse in the user link. Theperformance of the system under study is evaluated in terms of the outageprobability, the average bit-error rate (BER), and the ergodic capacity thatare derived in exact closed-forms in terms of the bivariate Meijer's Gfunction. Simple asymptotic results for the outage probability and the averageBER are also obtained at high signal-to-noise ratio.

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity