Results 11 to 20 of about 5,091,176 (291)
Diversity–disturbance relationships: frequency and intensity interact [PDF]
Biology Letters, 2012 An influential ecological theory, the intermediate disturbance hypothesis (IDH), predicts that intermediate levels of disturbance will maximize species diversity. Empirical studies, however, have described a wide variety of diversity–disturbance relationships (DDRs).
Hall, Alex R. +5 more
core +5 more sources
Analysis of DVB-H network coverage with the application of transmit diversity [PDF]
, 2008 This paper investigates the effects of the Cyclic Delay Diversity (CDD) transmit diversity scheme on DVB-H networks. Transmit diversity improves reception and Quality of Service (QoS) in areas of poor coverage such as sparsely populated or obscured ...
Owens, T +7 more
core +6 more sources
On the Sideband Harmonics in Pulsed Frequency Diverse Arrays [PDF]
IEEE Access, 2023 Pulsed frequency diverse arrays (FDAs) have recently garnered significant research attention in radar and sensing applications due to their range-dependent radiation properties. However, the time-dependent nature of radiation can limit the benefits of FDAs.
Ihsan Kanbaz +4 more
openaire +4 more sources
Performance Evaluation of Photonics-Based Coherent MIMO Radar Systems for Maritime Surveillance
Inventions, 2023 Multiple-input multiple-output (MIMO) radars offer significant advantages over conventional standalone radars in terms of target detection and localization capabilities.
Malik Muhammad Haris Amir +5 more
doaj +1 more source
Estimating Diversity via Frequency Ratios [PDF]
Biometrics, 2015 SummaryWe wish to estimate the total number of classes in a population based on sample counts, especially in the presence of high latent diversity. Drawing on probability theory that characterizes distributions on the integers by ratios of consecutive probabilities, we construct a nonlinear regression model for the ratios of consecutive frequency ...
Willis, Amy, Bunge, John
openaire +4 more sources
An error bound analysis for M-DPSK in frequency-selective Rayleigh fading channel with diversity reception [PDF]
, 1994 A theoretical upper bound is presented to calculate the error probability for raised cosine filtered M-ary differential phase-shift keying (RC M-DPSK) in frequency-selective Rayleigh fading channels.
Nix, AR, Chow, YC, McGeehan, JP
core +1 more source
Sensors, 2017 Indoor Positioning Systems (IPS) using Bluetooth Low Energy (BLE) technology are currently becoming real and available, which has made them grow in popularity and use.
Vicente Cantón Paterna +3 more
doaj +1 more source
Linear Constellation Precoded OFDM With Interleaved Subcarrier Index Modulation
IEEE Access, 2019 Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) is an emerging and promising multicarrier transmission technique; however, frequency diversity achievement requires further investigation for the OFDM-IM.
Qingbo Wang +3 more
doaj +1 more source
Frequency Diversity Gain of a Wideband Radar Signal
Remote Sensing, 2021 Wideband radar has high-range directional resolution, which can effectively reduce the fluctuation of echo and improve the detection probability of a target under the same detection probability requirement.
Mengmeng Shen +5 more
doaj +1 more source
Prospects of FMCW-based frequency diverse array radar
The Journal of Engineering, 2019 The linear frequency modulated (LFM) frequency modulated continuous wave (FMCW)-based frequency diverse array (FDA) radar concept is investigated in detail. The radar operates as a linear pulsed FMCW/FDA in the transmission (TX) mode while it operates as
Ramazan Çetiner +3 more
doaj +1 more source