Sensitivity Analysis of Multicarrier Digital Pre-distortion/ Equalization Techniques for Non-linear Satellite Channels
2013 (English)In: 31st AIAA International Communications Satellite Systems Conference, ICSSC 2013, 2013Conference paper (Refereed)
In order to mitigate the nonlinear distortion appearing in multicarrier satellite operation a significant back off is required, leading to power efficiency loss. This motivates the need to study techniques to improve power and spectral efficiencies. These techniques – digital pre-distortion (DPD) at the gateway and equalization (EQ) at the User Terminal– have been well documented in literature for single carrier per HPA 2-7and only a few results are available for multicarrier case8-10. This paper builds on our initial work in Ref.1 that performed a survey on the adaptability of various compensation techniques to the considered scenario and short-listed the most favourable ones. Preliminary performance analysis of these techniques was undertaken with Signal to Interference Ratio (SINR) as the figure of merit. The contribution of this work over Ref. 1 is twofold : (a) a full DVB-S2 chain is simulated with the chosen techniques with Total Degradation (TD) as the figure of merit and (b) a sensitivity analysis is performed to study the dependence of the pre-distortion/ equalization performance ( measured as TD) on the channel parameters.
This study will provide insights into the commercial viability of using single on-board HPA along with the on-ground compensation techniques. Of particular interest would be the analysis of the performance provided by the on ground processing techniques with respect to the amplifier technology (linearized/non-linearized TWTAs).
In the paper we describe: the scenario supporting multiple carriers per HPA, the non-linear channel model and its implications to multiple carrier transmissions in Section II, Enhancement techniques DPD and EQ in Section III and their simulation results in Section IV. Conclusions are drawn in Section V.
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IdentifiersURN: urn:nbn:se:kth:diva-140583DOI: 10.2514/6.2013-5692ScopusID: 2-s2.0-84887217003ISBN: 9781624102448OAI: oai:DiVA.org:kth-140583DiVA: diva2:691036
31st AIAA International Communications Satellite Systems Conference, ICSSC 2013; Florence; Italy; 14 October 2013 through 17 October 2013
QC 201402042014-01-262014-01-262014-02-04Bibliographically approved