Implementazione su fpga di un pre-distorsore digitale a banda larga per sistemi a microonde di backhaul

Pojani, Giacomo (2014) Implementazione su fpga di un pre-distorsore digitale a banda larga per sistemi a microonde di backhaul. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria delle telecomunicazioni [LM-DM270], Documento ad accesso riservato.
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The development of next generation microwave technology for backhauling systems is driven by an increasing capacity demand. In order to provide higher data rates and throughputs over a point-to-point link, a cost-effective performance improvement is enabled by an enhanced energy-efficiency of the transmit power amplification stage, whereas a combination of spectrally efficient modulation formats and wider bandwidths is supported by amplifiers that fulfil strict constraints in terms of linearity. An optimal trade-off between these conflicting requirements can be achieved by resorting to flexible digital signal processing techniques at baseband. In such a scenario, the adaptive digital pre-distortion is a well-known linearization method, that comes up to be a potentially widely-used solution since it can be easily integrated into base stations. Its operation can effectively compensate for the inter-modulation distortion introduced by the power amplifier, keeping up with the frequency-dependent time-varying behaviour of the relative nonlinear characteristic. In particular, the impact of the memory effects become more relevant and their equalisation become more challenging as the input discrete signal feature a wider bandwidth and a faster envelope to pre-distort. This thesis project involves the research, design and simulation a pre-distorter implementation at RTL based on a novel polyphase architecture, which makes it capable of operating over very wideband signals at a sampling rate that complies with the actual available clock speed of current digital devices. The motivation behind this structure is to carry out a feasible pre-distortion for the multi-band spectrally efficient complex signals carrying multiple channels that are going to be transmitted in near future high capacity and reliability microwave backhaul links.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Pojani, Giacomo
Relatore della tesi
Corso di studio
Ingegneria delle telecomunicazioni
Ordinamento Cds
Parole chiave
backhaul predistortion wideband polyphase
Data di discussione della Tesi
6 Ottobre 2014

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