1,721,182 research outputs found
Frequency-Shift Zero-Forcing Time-Varying Equalization for Doubly Selective SIMO Channels
No full text This paper deals with the problem of designing linear time-varying (LTV) finite-impulse response zero-forcing (ZF) equalizers for time- and frequency-selective (so-called doubly selective) single-input multiple-output (SIMO) channels. Specifically, relying on a basis expansion model (BEM) of the rapidly time-varying channel impulse response, we derive the canonical frequency-domain representation of the minimal norm LTV-ZF equalizer, which allows one to implement it as a parallel bank of linear time-invariant filters having, as input signals, different frequency-shift (FRESH) versions of the received data. Moreover, on the basis of this FRESH representation, we propose a simple and effective low-complexity version of the minimal norm LTV-ZF equalizer and we discuss the relationships between the devised FRESH equalizers and a LTV-ZF equalizer recently proposed in the literature. The performance analysis, carried out by means of computer simulations, shows that the proposed FRESH-LTV-ZF equalizers significantly outperform their competitive alternative.</p
Minimi temporali nell'Epistola a Erodoto di Epicuro?
No full textAnalisi della presenza dei minimi di tempo nell'Epistola a Erodoto di Epicuro
Accio, Lucrezio e la psicologia di Epicuro: osservazioni su Trag. 296 R.3 (589 Dangel)
No full textAnalisi dell'influenza terminologica di Accio sulla distizione lucreziana animus/anima
Essere, vita e pensiero. Ancora sull'ontoteologia in Aristotele
Full text linkAnalisi della presunta presenza di una concezione onto-teologica in Aristotele
L. Strauss, Socrate e Aristofane, a cura di Marco Menon, Edizioni ETS, Pisa 2019, 336 pp.
No full textRecensione del volume Leo Strauss, "Socrate e Aristofane", a cura di Marco Menon, Edizioni
ETS, Pisa 2019, 336 pp
Setia, Sacriportus e la marcia di Silla verso Roma
No full textEsame delle fonti antiche e archeologiche relative alla battaglia di Sacriporto
Ancora su Timasagora epicureo
No full textAnalisi storico-filosofica della figura dell'epicureo Timasagora di Rodi
Performance analysis of randomised space–time block codes for amplify-and-forward cooperative relaying
No full textIn recent studies (Verde et al.), capitalising on randomised space–time block coding (STBC), a decentralised coding method has been developed for amplify-and-forward (A&F) relays, which can closely achieve the performance of a centralised A&F linear dispersion coding (LDC) scheme and notebly outperform the decentralised A&F LDC counterpart, by requiring a reduced amount of signalling and processing overhead. However, A&F relaying process introduces correlation among the noise samples at the destination which, along with the non-Gaussian nature of the relaying channel and the fact that the relays are located in different positions, significantly complicates the performance analysis of the system. In this study, a theoretical performance analysis of the randomised STBC A&F rule is carried out in terms of average pairwise error probability to evaluate its attainable diversity order. Numerical results are provided to corroborate the analytical findings
Low-complexity time-varying frequency-shift equalization for doubly selective channels
No full textThis paper deals with the problem of designing linear time-varying (LTV) finite-impulse response equalizers for doubly selective channels. Specifically, we consider the frequencydomain representation of the LTV minimum mean-square error (MMSE) equalizer, which relies on the complex exponential basis expansion model of the time-varying channel impulse response and can be implemented as a parallel bank of linear timeinvariant filters having, as input signals, different frequency-shift (FRESH) versions of the received data. We show that such a FRESH formulation allows to derive an effective low-complexity iterative version of the optimal LTV-MMSE equalizer, based on the steepest-descent method. Simulation results show that the proposed iterative equalizer ensures a very satisfactory tradeoff among complexity burden, convergence speed, and performance
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