130,423 research outputs found
Carlo Corsi. Darsena a Riccione
No full textNella scheda viene brevemente ripercorsa la biografia dell’artista e commentata criticamente la tempera "Darsena a Riccione" alla luce della più aggiornata bibliografi
Minimum-mean-output-energy blind adaptive channel shortening for multicarrier SIMO transceivers
No full textIn this paper, we propose a blind adaptive channel shortening method for designing finite-impulse response time-domain equalizers (TEQs) in single-input multiple-output (SIMO) systems employing multicarrier modulations.
The proposed algorithm, which relies on a constrained minimization of the mean-output-energy at the TEQ output, does not require neither a priori knowledge of the channel impulse response nor transmission of training sequences,
and admits an effective and computationally-efficient
adaptive implementation. Moreover, the proposed TEQ is narrowband-interference resistant and its synthesis only requires an upper bound (rather than the exact knowledge)
of the channel order. Numerical simulations are provided to illustrate the advantages of the proposed technique over a recently developed blind channel shortener
Expanding cell coverage in cooperative base station systems by means of randomized MIMO-OFDM coding
No full textDesign of Cooperative MIMO Wireless Sensor Networks with Partial Channel State Information
No full textWireless sensor networks (WSNs) play a key role in automation and consumer electronics applications. This paper deals with joint design of the source precoder, relaying matrices, and destination equalizer in a multiple-relay amplify-and-forward (AF) cooperative multiple-input multiple-output (MIMO) WSN, when partial channel-state information (CSI) is available in the network. In particular, the considered approach assumes knowledge of instantaneous CSI of the first-hop channels and statistical CSI of the second-hop channels. In such a scenario, compared to the case when instantaneous CSI of both the first- and second-hop channels is exploited, existing network designs exhibit a significant performance degradation. Relying on a relaxed minimum-mean-square-error (MMSE) criterion, we show that strategies based on potential activation of all antennas belonging to all relays lead to mathematically intractable optimization problems. Therefore, we develop a new joint relay-and-antenna selection procedure, which determines the best subset of the available antennas possibly belonging to different relays. Monte Carlo simulations show that, compared to conventional relay selection strategies, the proposed design offers a significant performance gain, outperforming also other recently proposed relay/antenna selection schemes
Channel State Acquisition in Uplink NOMA for Cellular-Connected UAV: Exploitation of Doppler and Modulation Diversities
No full text
A constrained maximum-SINR NBI-resistant receiver for OFDM systems
No full textIn this paper, with reference to the problem of joint equalization and narrowband interference (NBI) suppression in orthogonal frequency-division multiplexing (OFDM) systems, synthesis and analysis of both unconstrained and constrained optimum equalizers are carried out, based on the maximum signal-to-noise-plus-interference (SINR) criterion. Specifically, a comparative performance analysis is provided from a theoretical point of view, either when the second-order statistics (SOS) of the received data are exactly known at the receiver, or when they are estimated from a finite number of data samples. Relying on the results of this analysis, a three-stage constrained maximum-SINR equalizer is then proposed, which outperforms existing receivers and, in comparison with its unconstrained counterpart, exhibits a significantly stronger robustness against errors in the estimated SOS. Moreover, a computationally efficient adaptive implementation of the three-stage equalizer is derived, and in connection with it, a simple and effective NBI-resistant channel estimation algorithm is proposed. Finally, numerical simulations are performed that aim to validate the theoretical analysis carried out and compare the performances of the considered equalizers with those of existing approache
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