Let's Communicate
We want to hear from you.

Monthly Archives: May 2014

The combined automatic repeat request and rate control mechanism in S-band mobile interactive multimedia asynchronous return link—design background, parameter dimensioning and first experimental results

By | News | No Comments

SUMMARY

In the S-band mobile interactive multimedia specification, an asynchronous access using Enhanced Spread Spectrum Aloha random access has been defined for occasional messaging applications. This access scheme is complemented by a combined automatic repeat request and terminal rate control mechanism that is described in this paper. Furthermore, a queuing theory-based model is developed to describe the behaviour of the automatic repeat request mechanism, and performance results from the first proof-of-concept implementation are presented. Copyright © 2014 John Wiley & Sons, Ltd.

Thumbnail image of graphical abstract

This paper presents the joint automatic repeat request and terminal rate control mechanism that have been defined for the S-band mobile interactive multimedia standard. A model based on queuing theory is developed to dimension the automatic repeat request parameters and understand the QoS boundaries of S-band mobile interactive multimedia. Furthermore, first experimental results are presented.

Enhanced spread Aloha physical layer design and performance

By | News | No Comments

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.