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by Sorour Falahati, Nilo Casimiro Ericsson, Student Member, Arne Svensson, Anders Ahln, Senior Member
http://db.s2.chalmers.se/download/publications/falahati_1192.pdf
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Abstract:
In this paper, we propose a system suitable for Internet Protocols (IP) which consists of an adaptive packet transmission scheme at the link layer and a time-slot scheduler supplied by channel predictions. Packet transmission is carried out based on two approaches where in the first, Adaptive Modulation and Coding assisted by an Automatic Repeat request protocol, referred to as AMC/ARQ, is utilized. The other alternative is a pure Adaptive Modulation Scheme (AMS) based on the prediction error statistics. The performance of the system in a downlink for fiat fading channels is investigated through simulations where in particular, BER, throughput and delay performance are studied. The results show that the AMC/ARQ scheme performs well for perfect and moderately accurate channel predictions and provides high throughput at low delay while fulfilling the BER requirement. The AMS provides the required Quality of Service (QoS) when the Mean Square Error (MSE) variance of the predicted channel gain power is perfectly or under-estimated. With small number of modulation schemes at the transmitter, the effect of over-estimation of the prediction performance on the BER becomes negligible.
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