Performance of link adaptation techniques for different service classes through land mobile satellite communication channels

Abstract

The end-to-end Quality of Service (QoS) is getting more and more importance nowadays. QoS is composed of many parameters, like bit error rate (BER) delay, jitter etc. The most important task will be in the future to provide reliable end-toend QoS over heterogenous networks, including satellite connections. The most unreliable part of an end-to-end connection is the wireless link, but wireless connections give the mobility for terminal equipments. This paper will deal with examining the performance of different link adaptation techniques for different service classes through land mobile satellite communication channels.There are different types of link adaptation techniques, like adaptive modulation and coding (AMC) or adaptive power allocation (APA), etc. Most of the today's link adaptation techniques exploit only the channel condition information to maximize bandwidth efficiency. However, taking into consideration the QoS information of services classes jointly with the channel condition information on the satellite link, an optimum usage of the resources can be reached. In this contribution it will be shown that data rate can be increased, and the delay can be decreased with this concept. However, considering land mobile satellite communication channels, the main part of the delay is caused by the propagation distance, so delay decreasing using AMC is not contributing significantly to the total delay. The paper will provide simulation results of spectral efficiency, and data rate of the proposed novel AMC, compared to the conventional AMC and of the proposed novel APA, compared to the conventional APA, based on measurement results of received power level of land mobile satellite connection operating at 1,54 GHz.

Link adaptation for mitigating Earth-to-Space propagation effects on the NASA SCaN testbed

“…The algorithm suggested in this thesis monitors and switches modulation schemes depending on the signal strength on the communication link as it fluctuates throughout ISS passes. LA is used in a variety of terrestrial applications such as WiFi, land mobile communications, and cellular systems [3][4][5][6][7][8]. LA has also been used in satellite communications applications [9][10][11][12], evaluating the performance of an adaptive modulation system in the unique space-based propagation environment.…”

“…Similarly, investigation into LA in a dynamic spectrum access application for cognitive radios has also been presented [39]. LA in Land Mobile Satellite systems have also been proposed and analyzed [7,8].…”

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