Onboard Compensation of Linear and Non-Linear Hardware Imperfections in Multiport Amplifiers

Usman, Ovais Bin; Staude, G.; Knopp, Andreas

doi:10.1109/glocom.2018.8647682

Cited by 1 publication

(4 citation statements)

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“…Content may change prior to final publication. [3], [19], [16], [18], [22] [27], [28], [29] In-direct: [3], [10] Direct: [22], [25] on-ground: wideband narrowband on-board: wideband narrowband (data or signal predistorters) and the applied technology (digital or analog predistorters). Table 1 lists these classes and some of their important characteristics.…”

Section: A Classes Of Predistortersmentioning

confidence: 99%

“…The simulations are performed in Matlab where each block in Figure 2 is modelled as an object oriented block. Similar programming framework is employed in [10], [19].…”

Section: A Uplink-signal Characteristics Vs Dpd Performancementioning

confidence: 99%

“…Due to the limitations like weight, power and radiation hardening requirements of the hardware in satellites, less powerful OBPs are employed on-board [19]. The current state-of-the-art OBPs lag in performance when compared to the digital signal processors (DSPs) employed in ground stations [20] [21].…”

Section: Introductionmentioning

confidence: 99%

“…To implement adaptive DPD solutions, a feedback loop is required. Conventionally, the bandwidth of the HPA output reaches up to five times that of the input signal bandwidth due to the spectral regrowth [19], [22]. Sampling such high bandwidth signals in the feedback path would imply using analog-to-digital converters (ADCs) and DSPs with ultra high sampling rates, which is currently not possible, and would consume a lot of power [23].…”

Section: Introductionmentioning

confidence: 99%

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Digital Predistortion in High Throughput Satellites: Architectures and Performance

Usman

Knopp

2021

IEEE Access

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The future of satellites lies in the deployment of high throughput satellites (HTS). Moreover, HTS will also play an important role in the up coming 5G mobile networks where HTS will provide services like disaster relief, remote automation, maritime services etc. However, the distortions caused by the on-board transponder filters and high power amplifiers (HPAs) reduce the overall performance of HTS. To increase the power and bandwidth efficiency, the transponder HPAs are often operated close to saturation and in multicarrier mode. In addition, the transponder filters are built with tighter guard bands to minimize the out-of-band (OOB) radiations. Such operation conditions introduce severe linear and nonlinear distortions in the transponder's output in terms of inter-modulation (IMD) noise, spectral regrowth, and memory effects. Digital predistortion (DPD) can effectively mitigate these distortions. This paper proposes an on-board implementation of a ground-based state-of-the-art bandlimited memory polynomial (MP) DPD method to mitigate the aforementioned distortions. The authors stress on the fact that the on-board application of the proposed ground-based DPD makes it the most suitable DPD method for HTS. However, the focus of this paper lies in the identification of the system parameters which effect the predistortion performance. To this end, the performance of the considered state-of-the-art DPD is thoroughly analyzed for varying uplink-signal, transponder and DPD specific parameters.INDEX TERMS Bandlimited predistortion, digital predistortion (DPD), high power amplifiers (HPAs), high throughput satellites (HTS), non-linear distortions, on-board processors (OBPs), parameter identification.

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Section: A Classes Of Predistortersmentioning

confidence: 99%

“…The simulations are performed in Matlab where each block in Figure 2 is modelled as an object oriented block. Similar programming framework is employed in [10], [19].…”

Section: A Uplink-signal Characteristics Vs Dpd Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%