Multicarrier Digital Pre-distortion/ Equalization Techniques for Non-linear Satellite Channels
نویسندگان
چکیده
Two key advances are envisaged for future missions: (a) spectrally efficient transmission to meet the increasing demand and (b) sharing of satellite capacity among different links to meet power/mass requirements. Joint amplification of multiple-carrier DVB-S2 signals using a single High-Power Amplifier (HPA) is a particular application of satellite resource sharing. However, effects specific to such a scenario that degrade power and spectral efficiencies include (a) an increased Adjacent Channel Interference caused by non-linear characteristic of the HPA and (b) increased peak to average power ratio. The paper studies signal processing techniques – digital pre-distortion (DPD) at the gateway and equalization (EQ) at the User Terminal – to mitigate the non-linear effects and improve power as well as spectral efficiencies. While the algorithms for DPD and EQ are described in literature, their use in multi-carrier scenario is novel and poses new challenges that are investigated in the paper
منابع مشابه
Sensitivity Analysis of Multicarrier Digital Pre-distortion/ Equalization Techniques for Non-linear Satellite Channels
ACI = Adjacent Channel Interferences APSK = Amplitude Phase Shift Key BER = Bit Error Rate DPD = Digital Predistortion DTH = Direct To Home EQ = EQualization FIR = Finite Impulse Response GW = Gate Way HPA = High Power Amplifier IBO = Input Back-Off IMUX = Input ISI = Inter-Symbol Interference L-TWTA = Linearized Travelling Wave Tube Amplifier LS = Least Squares OBO = Output Back-Off OMUX = Out...
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