Int. J. Satell. Commun.
 1997
DOI: 10.1002/(sici)1099-1247(199711/12)15:6<269::aid-sat587>3.0.co;2-r
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Doppler as a new dimension for multiple access in LEO satellite systems

Irfan Ali
1
,
Naofal Al‐Dhahir
2
,
John E. Hershey
3
et al.
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Cited by 13 publications

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“…Numerical results validated the analytical expressions for circular-orbit satellites with altitude up to 10,000 km. In [5], a Doppler-based multiple access protocol for a bent-pipe LEO satellite system was proposed. In the satellite visibility footprint, regions of eligibility were configured based on the parameters of the Doppler-time curves at the users.…”
Section: A Related Workmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…Numerical results validated the analytical expressions for circular-orbit satellites with altitude up to 10,000 km. In [5], a Doppler-based multiple access protocol for a bent-pipe LEO satellite system was proposed. In the satellite visibility footprint, regions of eligibility were configured based on the parameters of the Doppler-time curves at the users.…”
Section: A Related Workmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…Thus far, conventional satellite communication systems have primarily utilized frequency bands of 1 to 4 GHz, which are L or S band. Due to saturation at the low frequency bands, however, high frequency bands above 20 GHz, such as Ka band (27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40), have been increasingly explored for their ability to provide stable broadband services. In addition, satellite networks should provide services in mobile environments [8], known as the MSS, to keep up with terrestrial mobile networks, including 5G technology, which has achieved rapid advancements in recent years [9]- [11].…”
mentioning
confidence: 99%
“…The influence of the Doppler effect on satellite communication was primarily considered for fast movements of LEO satellites in previous studies [32]- [35]. The Doppler effect in GEO satellites with mobile stations at low frequency bands, such as [36], was rarely analyzed.…”
mentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
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