- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Measurements of Beamswitching Gains and Fade Dynamics for 28 GHz Indoor Static Links in the Presence of Pedestrian Traffic
摘要： We measured channel dynamics for fixed wireless indoor channels at 28 GHz. We characterize pedestrian-induced fades in open indoor spaces and the effectiveness of beamswitching to mitigate them. We find that fades of the dominant propagation path may be as deep as 9 dB at the 90th percentile and that alternative signal paths are typically not strong enough to provide significant beamswitching gains.
关键词： Millimeter wave propagation,Rician channels,Channel models,Multipath channels,Fading channels
更新于2025-09-23 15:22:29
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[IEEE 2019 International Conference on Electrical, Communication, and Computer Engineering (ICECCE) - Swat, Pakistan (2019.7.24-2019.7.25)] 2019 International Conference on Electrical, Communication, and Computer Engineering (ICECCE) - Modeling and Analysis of Novel Tandem Solar Cells
摘要： While relay-based cooperative networks (widely known in the literature as cooperative communication), where relays only forward signals from the sources to the destination, have been extensively researched, fully cooperative systems have not been thoroughly examined. Unlike relay networks, in a fully cooperative network, each node acts as both a source node sending its own data and a relay forwarding its partner’s data to the destination. Mutual cooperation between neighboring nodes is believed to improve the overall system error performance, especially when space-time codes are incorporated. However, a comprehensive performance analysis of space-time-coded fully cooperative communication from all three perspectives, namely error performance, outage probability, and energy efficiency, is still missing. Answers to the commonly asked questions of whether, in what conditions, and to what extent the space-time-coded fully cooperative communication is better than direct transmission are still unknown. Motivated by this fact and inspired by the increasing popularity of healthcare applications in wireless body area networks (WBANs), this paper derives for the first time a comprehensive performance analysis of a decode-and-forward space-time coded fully cooperative communication network in Rayleigh and Rician fading channels in either identically or non-identically distributed fading scenario. Numerical analysis of error performance, outage probability, and energy efficiency, validated by simulations, show that fully cooperative communication is better than direct transmission from all three aspects in many cases, especially at a low-power and low signal-to-noise ratio regime, which is a typical working condition in WBANs.
关键词： symbol error rates,energy efficiency,MIMO,space-time codes,Rician,decode-and-forward,outage probability,wireless body area networks,Cooperative communication,Rayleigh
更新于2025-09-23 15:19:57
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[IEEE 2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) - Denpasar, Bali, Indonesia (2019.10.1-2019.10.4)] 2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) - Synchronous Generator Stability Investigation in Power System with High-Penetration Photovoltaics Under Varying Solar Irradiances
摘要： While relay-based cooperative networks (widely known in the literature as cooperative communication), where relays only forward signals from the sources to the destination, have been extensively researched, fully cooperative systems have not been thoroughly examined. Unlike relay networks, in a fully cooperative network, each node acts as both a source node sending its own data and a relay forwarding its partner’s data to the destination. Mutual cooperation between neighboring nodes is believed to improve the overall system error performance, especially when space-time codes are incorporated. However, a comprehensive performance analysis of space-time-coded fully cooperative communication from all three perspectives, namely error performance, outage probability, and energy efficiency, is still missing. Answers to the commonly asked questions of whether, in what conditions, and to what extent the space-time-coded fully cooperative communication is better than direct transmission are still unknown. Motivated by this fact and inspired by the increasing popularity of healthcare applications in wireless body area networks (WBANs), this paper derives for the first time a comprehensive performance analysis of a decode-and-forward space-time coded fully cooperative communication network in Rayleigh and Rician fading channels in either identically or non-identically distributed fading scenario. Numerical analysis of error performance, outage probability, and energy efficiency, validated by simulations, show that fully cooperative communication is better than direct transmission from all three aspects in many cases, especially at a low-power and low signal-to-noise ratio regime, which is a typical working condition in WBANs.
关键词： Rayleigh,symbol error rates,MIMO,outage probability,Rician,decode-and-forward,energy efficiency,Cooperative communication,wireless body area networks,space-time codes
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE International Conference on Image Processing (ICIP) - Taipei, Taiwan (2019.9.22-2019.9.25)] 2019 IEEE International Conference on Image Processing (ICIP) - Bayesian Reconstruction of Undersampled Multicoil Hardi
摘要： High-angular-resolution diffusion imaging (HARDI) relies on multicoil acquisitions for clinical applications. HARDI scan time can be reduced by undersampling the set of gradient directions. Typical methods for undersampled HARDI reconstruction use two-stage schemes that first take scanner-reconstructed magnitude images for the acquired directions, and then fit a model to the reconstructed undersampled diffusion signals, where they assume a Gaussian noise model that behaves poorly for high b values or high noise. In contrast, we propose a novel Bayesian framework for undersampled-HARDI reconstruction that directly fits to multicoil data. We use magnitude images per coil and a Rician noise model to bypass complicated phase-related artifacts and accurately reconstruct at large b values. We use a sparse dictionary prior on the diffusion signal across directions, and a multiscale wavelet regularity on each diffusion weighted image. Results on simulated and clinical HARDI data show that our method improves over the state of the art.
关键词： Bayesian,undersampling,HARDI,dictionary,Rician noise,Reconstruction,parallel imaging
更新于2025-09-11 14:15:04
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[IEEE 2018 International Conference on Information and Communications Technology (ICOIACT) - Yogyakarta (2018.3.6-2018.3.7)] 2018 International Conference on Information and Communications Technology (ICOIACT) - Dynamical characteristics of the FSO transmission capacity in the presence of Rician turbulence
摘要： In this paper temporal behavior of the free-space optics (FSO) channel capacity under the influence of Rician turbulence is considered. Expressions for the Cumulative Distribution Function (CDF), Probability Density Function (PDF), and the Level Crossing Rate (LCR) of the transmitted FSO signal exposed to Rician turbulence are derived, and numerical results graphically presented.
关键词： FSO,channel capacity,Rician turbulence,PDF,LCR
更新于2025-09-10 09:29:36