Integrated satellite-HAP systems

Cianca, Ernestina; Prasad, Ramjee; Sanctis, Mauro De; Luise, A. De; Antonini, M.; Teotino, Daniele; Ruggieri, M.

doi:10.1109/mcom.2005.1561921

Cited by 53 publications

(20 citation statements)

References 8 publications

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“…When the SSLL decides that the PU channel is free, it allows TCP packets waiting in the BS buffer to be transmitted. TCP packets are secured by a Link Layer (LL) Stop and Wait ARQ mechanism [29]. The following derivations are assumed for the TCP steady state, i.e.…”

Section: A System Modelmentioning

confidence: 99%

Performance of Transport Control Protocol Over Dynamic Spectrum Access Links

Slingerland

Pawełczak

Prasad

et al. 2007

2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks

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Dynamic Spectrum Access (DSA) radio devices look for temporarily unoccupied frequency bands and attempt to communicate in them. It is envisioned that DSA can substantially increase the capacity of wireless networks by broadening the utilization of radio resources. Given the ubiquitous use of Internet's Transport Control Protocol (TCP), it can be expected that TCP will be used in DSA networks in the future. Whether TCP can efficiently provide stable end-to-end transmissions over DSA links, given their dynamic and unpredictable nature, remained unclear. Therefore, we have studied by simulation the ability of various TCP flavors to efficiently utilize DSA links. We have performed simulations using the TCP stack from the Linux operating system. Our simulations show that modern TCPs can efficiently make use of the dynamic capacity of DSA links for bulk data transmission, under a wide range of conditions, but only if certain requirements are met. We also analytically determine the effect of Primary User (PU) detection errors on TCP performance and conclude that the dominating component responsible for TCP throughput reduction in a DSA environment is the observation time, not, as one might expect, PU detection errors.

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Section: A System Modelmentioning

confidence: 99%

Performance of Transport Control Protocol Over Dynamic Spectrum Access Links

Slingerland

Pawełczak

Prasad

et al. 2007

2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks

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“…High Altitude Platforms (HAP) [28] use a quasi-stationary aerial platform equipped with wireless transceivers offering broadband wireless access with data rates of 120 Mbps or up to 10 Gbps in some configurations. This type of wireless technology offers good coverage with better LOS connections.…”

Section: Coordination Function (Pcf)mentioning

confidence: 99%

Quality-Oriented Mobility Management for Multimedia Content Delivery to Mobile Users

Ciubotaru

Muntean

2012

Ubiquitous Multimedia and Mobile Agents

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The latest advances in wireless data access technologies and increased popularity of mobile computing have enabled the development of the future mobile Internet. The various wireless technologies and standards already developed or under development support the existence of a highly heterogeneous wireless communication environment in which mobile users access the network from diverse devices and exchange data of various types. In the context of such a heterogeneous wireless and mobile environment, maintaining certain level of Quality of Service required by some applications and consequently providing high user Quality of Experience is very challenging. This chapter analyzes the state of the art in quality-oriented mobility management in heterogeneous wireless environments in the context of mobile multimedia applications. Most important wireless access technologies and multimedia support systems and protocols for wireless delivery are presented, while requirements for quality-oriented mobility management are identified. Handover management is discussed as the component of the mobility management system with the greatest impact on the quality as measured by the user. Finally a novel multimedia mobility management framework is presented which aims at maintaining high user perceived quality while efficiently exploiting all the communication resources available in a heterogeneous wireless environment.

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“…There are 16068 patents about spread spectrum in National Patent Office of America, further involving PN-code capture is 590. These patents contain design, synchronization, sending, receiving and positioning of PN-code, etc [2]- [4] . In the domestic, Tsinghua university, Shanghai Jiaotong University and Beijing University of Aeronautics and Atronautics and Aerospace Science and Technology Group etc have made a series of innovative research results In the satellite signal capturing and tracking algorithm [5] .…”

Section: Introductionmentioning

confidence: 99%

Study of PN-code Capture Method with High Dynamic and Low SNR in Near Space

Sun¹,

Hou²,

Zhao³

2015

Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science

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Abstract-Considering the requirement of building near space tt&c system, it designed a parallel PN-code capture method based on FFT. First, it gave a clear derivation of the principle of parallel PN-code capture method, analyzed the capture performance in detail, and finally proved the feasibility of the method through simulation experiment. This method on the one hand weakens the influence of the doppler frequency, and reduces the capture dimension from 2 to 1. At the same time, it achieved the related operations, the relative value of local code and receiving yards was acquired. By this, some special requirements were satisfied and the circuit was simplified, capture speed was improved very much. On the whole, the method overcomes the poor performance under low SNR of traditional capture method, has a good prospect of engineering application.

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Integrated satellite-HAP systems

Cited by 53 publications

References 8 publications

Performance of Transport Control Protocol Over Dynamic Spectrum Access Links

Performance of Transport Control Protocol Over Dynamic Spectrum Access Links

Quality-Oriented Mobility Management for Multimedia Content Delivery to Mobile Users

Study of PN-code Capture Method with High Dynamic and Low SNR in Near Space

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