نتایج جستجو برای: nyquist criterion
تعداد نتایج: 81430 فیلتر نتایج به سال:
In this paper, we study the multi-agent system to achieve a faster consensus with multiple time-delays under a directed asymmetric information exchange topology. We first assume that an agent processes its own state information with self-delay and receives state information from its neighbors with communication delays. Based on state proportion derivative feedback, the improved consensus protoc...
We develop inequalities for the fraction of a bandlimited function's Lp norm which can be concentrated on any set of small 'Nyquist density'. We mention two applications. First, that a bandlimited function corrupted by impulsive noise can be reconstructed perfectly, provided the noise is concentrated on a set of Nyquist density < 1/7r. Second, that a wideband signal supported on a set of Nyquis...
This paper investigates compressed sensing (CS) based methods for reducing data-acquisition time in 2D millimeter-wave holographic imaging systems. Specific attention is paid to situations where the array element spacing does not satisfy the Nyquist criterion due to physical limitations. Simulation and experimental results demonstrate that CS methods achieve better reconstruction than the conve...
Nyquist sinc-pulse shaping provides spectral efficiencies close to the theoretical limit. In this paper we discuss the analogy to optical orthogonal frequency division multiplexing and compare both techniques with respect to spectral efficiency and peak to average power ratio. We then show that using appropriate algorithms, Nyquist pulse shaped modulation formats can be encoded on a single wave...
A new architecture, denoted as the Nyquist folding digital receiver (NYFDR), to compress the data for signal interception is presented. The NYFDR is a digital version of the Nyquist folding receiver (NYFR). Simulation results show that the NYFDR has advantages over NYFR in the detection of Nyquist zone. Moreover, the data rate and resource consumption of the NYFDR are less than those of the dig...
A signal is stationary if its statistical characteristics do not change with time. Signals of practical interest often do not comply with this requirement [1]. It has been quit difficult to satisfactorily handle non-stationary signals using conceptualizations based on stationarity, as it is assumed, for example, by classical Fourier transform. Nonstationary signals justify the need for joint ti...
We present a sub-Nyquist analog-to-digital converter of wideband inputs. Our circuit realizes the recently proposed modulated wideband converter, which is a flexible platform for sampling signals according to their actual bandwidth occupation. The theoretical work enables, for example, a sub-Nyquist wideband receiver, which has no prior information on the transmitter carrier positions. Our desi...
Compressive sensing is a powerful method for reconstruction of sparsely-sampled data, based on statistical optimization. It can be applied to range flow measurement and visualization in this work we show the usage groundwater mapping. Due scarcity water many regions world, including southwestern United States, monitoring management utmost importance. A complete mapping difficult since monitored...
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