Abstract

This paper studies the End-to-End (E2E) performance of a High Throughput Satellite (HTS) system that utilizes a transparent (non-regenerative) optical feeder link to transport the DVB-S2 signals associated with the large number of spot-beams in the radio access link. Two main sources of non-linearity are considered to characterize the effect that the satellite forward link has in the DVB-S2 signal, namely the optical Mach-Zehnder Modulator (MZM) in the gateway and the High Power Amplifier (HPA) in the satellite. Digital Pre-Distortion (DPD) and linear equalization are also implemented to mitigate the impact of the non-linear distortion and the inter-symbol interference on the Packet Error Rate (PER) of the received DVB-S2 signal. The performance analysis is carried out using the Total Degradation (TD) as performance indicator. As expected, the Input Back-Off (IBO) of the HPA and the modulation index of the MZM should be jointly optimized according to the DVB-S2 MODCOD that is selected for transmission. Therefore, the stronger is the Forward Error Correction (FEC) code that is used, the lower is the IBO and the higher is the modulation index that can be utilized to minimize the impact of non-linearities in the E2E performance.

Highlights

  • High Throughput Satellite (HTS) systems are constantly evolving to provide 5G data services in remote areas where terrestrial mobile access is not possible or economically viable [1]

  • The effect of the non-linear distortion that an analog transparent optical feeder link introduces in the E2E performance of a DVB-S2 system has been studied in detail

  • The performance was evaluated in terms of the Total Degradation (TD), when Digital Pre-Distortion (DPD) and LMS equalization were applied to minimize the effect that the non-linear distortion has on the Packet Error Rate (PER) of the received DVB-S2 signal

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Summary

INTRODUCTION

High Throughput Satellite (HTS) systems are constantly evolving to provide 5G data services in remote areas where terrestrial mobile access is not possible or economically viable [1]. In the fully regenerative payload case, the optical feeder link terminates in the satellite; robust Forward Error Correction (FEC) coding can be used to correct the long error bursts that the turbulent optical wireless channel introduces [6]. This approach enables the implementation of advanced signal processing mechanisms (e.g., beam precoding) onboard the satellite, making possible to achieve even higher spectral/energy efficiencies in the HTS system [7].

SYSTEM MODEL
Digital pre- and post-distortion compensation
DISTORTION INTRODUCED BY OPTICAL FEEDER LINK
In-band and out-of-band non-linear distortion of MZM
SIMULATION RESULTS
CONCLUSION
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