323,968 research outputs found
MIMO precoding for filter bank modulation systems based on PSVD
No full textIn this paper we consider the design of a linearly precoded MIMO transceiver based on filter bank (FB) modulation for transmission over broadband frequency selective fading channels. The modulation FB is capable of lowering the channel dispersion at sub-channel level. Nevertheless, the sub-channels experience some level of inter-symbol interference. Therefore, the pre-coder and the equalizer are designed exploiting the polynomial singular value decomposition (PSVD). In particular, we consider two types of FB system. The first system deploys maximal frequency confined pulses and it is referred to as filtered multitone (FMT) modulation, while the second uses maximal time confined pulses with rectangular impulse response, i.e., it corresponds to the conventional orthogonal frequency division multiplexing (OFDM) system. We compare the performance of the considered systems in terms of capacity over typical WLAN channels, showing that PSVD precoding with FMT can outperform the performance of precoded OFDM in the two-bytwo antenna case especially for moderate to low SNRs
PLC for the smart grid: state-of-the-art and challenges
No full textThis paper aims to review systems and applications for power line communications (PLC) in the context of the smart grid. We discuss the main applications and summarise state-of-the-art PLC systems and standards. We report efforts and challenges in channel and noise modelling, as well as in state-of-the-art transmission technology approaches
Discrete Multi-tone and Filtered Multi-tone Architectures for Broadband Asynchronous Multi-user Communications
No full textPerformance of Single User Detectors in Multitone Multiple Access Asynchronous Communications
No full textInitial results on an MMSE precoding and equalisation approach to MIMO PLC channels
No full textThis paper addresses some initial experiments using polynomial matrix decompositions to construct MMSE precoders and equalisers for MIMO power line communications (PLC) channels. The proposed scheme is based on a Wiener formulation based on polynomial matrices, and recent results to design and implement such systems with polynomial matrix tools. Applied to the MIMO PLC channel, the strong spectral dynamics of the PLC system together with the long impulse responses contained in the MIMO system result in problems, such that diagonlisation and spectral majorisation is mostly achieved in bands of high energy, while low-energy bands can resist any diagonalisation efforts. We introduce the subband approach in order to deal with this problem. A representative example using a simulated MIMO PLC channel is presented
On Rate Improvements and Power Saving with Opportunistic Relaying in Home Power Line Networks
No full text
Sulla koiné crepuscolare torinese Gozzano e Vallini
No full textIl sodalizio personale e poetico di Gozzano e Carlo Vallini è fatto
noto alla critica. Da più parti è stata rilevata una certa influenza di
Gozzano sull’amico fraterno, epigono della “scuola dell’ironia” da lui
fondata. Proporrò qualche rilievo sulla produzione di Vallini allo scopo
di misurare la portata del suo magistero artistico. Riprendo anzitutto
brevemente le tappe più importanti di questo percorso di relazione
Segnalazione di S. Giusti, Pellegrinaggio di Giuseppe Ungaretti: esercizio di lettura
No full textAttraverso la proposta di un esercizio
di lettura dichiaratamente scolastico,
l’autore giunge alla conclusione
tutt’altro che ingenua che solo Ungaretti
insegna a leggere Ungaretti
Segnalazione di S. Giusti, Pellegrinaggio di Giuseppe Ungaretti: esercizio di lettura
No full textAttraverso la proposta di un esercizio
di lettura dichiaratamente scolastico,
l’autore giunge alla conclusione
tutt’altro che ingenua che solo Ungaretti
insegna a leggere Ungaretti
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