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Enhanced spread Aloha physical layer design and performance

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SUMMARY

This paper describes the key design and performance aspects of the Enhanced Spread Spectrum Aloha (E-SSA) physical layer, which represents an essential component of the S-band Mobile Interactive Multimedia European Telecommunication Institute standard. Thanks to advanced signal processing at the gateway side, the E-SSA random access protocol allows to achieve unprecedented spectral efficiency in a pure asynchronous random access mode with high robustness against received packets power unbalance. The E-SSA physical layer is closely derived from the Third Generation Partnership Wideband Code Division Multiple Access random access channel physical layer with some adaptation to best operate in the Land Mobile Satellite channels. Particular emphasis is devoted to the E-SSA physical layer system design drivers as well to the packet transmission control policies, which are of high relevance for S-band Mobile Interactive Multimedia. The demodulator architectural design is also illustrated jointly with some of the key detection performance. Finally, the E-SSA random access protocol performance are reported for Additive White Gaussian Noise and satellite mobile channels. Copyright © 2014 John Wiley & Sons, Ltd.

Thumbnail image of graphical abstract

This paper describes the key design and performance aspects of the Enhanced Spread Spectrum Aloha physical layer, which represents an essential component of the S-band Mobile Interactive Multimedia European Telecommunication Institute standard. The E-SSA physical layer is closely derived from the Third Generation Partnership Wideband Code Division Multiple Access Random Access (RA) channel physical layer with some adaptation to best operate in the Land Mobile Satellite channels. The gateway exploits packet optimized Successive Interference Cancellation to boost the RA performance.

Transmission control protocol performance enhancement for mobile broadband interactive satellite communication system: a cross-layer approach

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SUMMARY

Mobile broadband interactive satellite communication system is of great interest in both academic and industrial communities. However, the conventional strict-layered protocol stack architecture and the standard TCP version perform poorly over satellite link. In this paper, we propose a comprehensive cross-layer Transmission Control Protocol (TCP) optimization architecture while considering the main factors that affect the TCP performance. In our proposed architecture, we adopt two TCP split connection performance enhancing proxies to isolate the satellite link from the terrestrial part of the broadband satellite communication system. Then, based on the proposed cross-layer architecture, we present an analytical model for the TCP throughput by taking the modulation and coding (ModCod) mode and the allocated bandwidth into account. In addition, we put forward a TCP-driven bandwidth sharing and ModCod mode optimization algorithm to maximize the TCP throughput in satellite link. Extensive simulation results illustrate that our proposed comprehensive cross-layer TCP optimization approach is able to improve the TCP throughput significantly. Copyright © 2014 John Wiley & Sons, Ltd.

Thumbnail image of graphical abstract

In this paper, a comprehensive cross-layer Transmission Control Protocol optimization architecture is proposed for mobile broadband interactive satellite communication system. Based on the proposed cross-layer architecture, we further present an analytical model for the TCP throughput by taking the modulation and coding (ModCod) mode and the allocated bandwidth into account. Then, a TCP-driven bandwidth sharing and ModCod mode optimization algorithm is put forward to maximize the TCP throughput in satellite link.

Metro Debuts $1M Mobile Unit For Emergency, Large Event Operations

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Transportation officials Thursday debuted a new state-of-the-art mobile command post designed to help keep bus and rail operations running smoothly in the event of an emergency.

KNX 1070’s Pete Demetriou reports Metro’s Mobile Command Center may look like a giant black mobile home from the outside, but officials say inside it’s nothing less than a rolling intelligence hub. Read More

Squire Tech Solutions Replaces pCom® 300 and pCom® 400 Series with New pCom® XL Satellite Trailer

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Dallas, TX (PRWEB) October 17, 2012 – Squire Tech Solutions, leading tactical satellite service provider and mobile response equipment manufacturer, announced today the replacement of the pCom® 300 and 400 line with the 2013 pCom® XL Satellite Trailer. The discontinuation of the pCom® 300 and 400 series was based on consumer feedback to incorporate enhancements, and in part general improvements scheduled by Squire Tech’s research and development team.

The 2013 pCom® XL offers a flexible design, providing immediate deployable self-contained power generator, lighting and communications infrastructure. The pCom’s electronics bays have Aluminum extreme environment enclosure controls for humidity, water intrusion, heat, cooling, and air-born particulate filtration.

The pCom’s® on-board 9,000 – 25,000 watt ultra-quiet power generation system options provides for site power, core communications equipment and powerful scene lighting system. The clean power generation, a 93 gallon internal diesel tank, and an auto-acquire satellite when combined with a 30 foot (up to 50 foot) internally cabled tower creates the ultimate response trailer. Read More

California University Public Safety Conference Demonstrates pCom 300 in Lake Tahoe

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The California College and University Police Chiefs Association (CCUPCA), was founded in 1982 to represent and promote the interests of safety and security in the public and private institutions of higher education throughout California. The non-profit Association is dedicated to promoting and advancing the professional development of higher educational campus safety by acting as a focal point for the exchange of professional ideas and information, and by hosting conferences and training classes. Read More

Squire Tech Solutions Announces 2011 pCom® V2 Communication Trailer

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Today at the 30th Annual Satellite 2011 Conference (SAT 2011), Squire Tech Solutions announced immediate availability of the Squire Tech Solutions 2011 pCom® V2 communications trailer, enabling value added resellers (VAR’s), Corporations and Government agencies to deploy communications, lighting, and power infrastructure virtually anywhere.

2011 pCom® V2
Squire Tech’s 2011 pCom® V2 is the culmination of 24 months of feature revisions and updates driven by customer feedback and is part of Squire Tech’s commitment to deliver the best communications interoperability products available. Read More

SatNews Daily: Squire Tech Solutions… Tailored Trailering (SATCOM)

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[SatNews] Now available from Squire Tech is their pCom(tm) 300 mission critical power communications satellite trailer. The pCom 300 is designed for government and private industry mobile infrastructure needs and provides an immediately deployable, self contained power generator, lighting, and communications capability wherever needed. Emergency response and field operations requires infrastructure designed to solve the problems that come with the unknown. The flexible design of the pCom™ 300 offers an environment to operate vital communications equipment and services to IT and Incident Operations Management personnel. Read More