Doubling the Accuracy of Indoor Positioning: Frequency Diversity [PDF]
Sensors, 2020 Determination of indoor position based on fine time measurement (FTM) of the round trip time (RTT) of a signal between an initiator (smartphone) and a responder (Wi-Fi access point) enables a number of applications.
Berthold K.P. Horn
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Direction of Arrival Estimation Using Two Hydrophones: Frequency Diversity Technique for Passive Sonar [PDF]
Sensors, 2019 The traditional passive azimuth estimation algorithm using two hydrophones, such as cross-correlation time-delay estimation and cross-spectral phase estimation, requires a high signal-to-noise ratio (SNR) to ensure the clarity of the estimated target ...
Peng Li, Xinhua Zhang, Wenlong Zhang
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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
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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
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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
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Spatial processing for frequency diversity schemes [PDF]
IEEE Transactions on Signal Processing, 2000 A novel technique to obtain optimum blind spatial processing for frequency diversity spread spectrum (FDSS) communication systems is introduced. The sufficient statistics for a linear combiner, which prove ineffective due to the interferers frequency characteristics, are modified to yield improved detection under partial jamming in the spectral domain.
Lagunas Hernandez, Miguel A. +3 more
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A modified Alamouti scheme for frequency selective channels incorporating turbo equalization [PDF]
, 2002 The Alamouti scheme can achieve transmit diversity in the presence of frequency selective flat fading channels. The technique has received considerable attention mainly because of its processing simplicity. Recently, a modification to the Alamouti scheme
Nix, AR +3 more
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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
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Impacts of frequency increment errors on frequency diverse array beampattern [PDF]
EURASIP Journal on Advances in Signal Processing, 2015 Different from conventional phased array, which provides only angle-dependent beampattern, frequency diverse array (FDA) employs a small frequency increment across the antenna elements and thus results in a range angle-dependent beampattern. However, due to imperfect electronic devices, it is difficult to ensure accurate frequency increments, and ...
Kuandong Gao +4 more
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Area spectral efficiency of soft-decision space–time–frequency shift-keying-aided slow-frequency-hopping multiple access [PDF]
, 2012 Slow-frequency-hopping multiple access (SFHMA) can provide inherent frequency diversity and beneficially randomize the effects of cochannel interference.
Ngo, Hoang Anh +3 more
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