Adaptive multiresolution modulation for multimedia traffic in dynamic wireless environment

摘要

Modern day wireless systems requires the ability to support multitude of services with different reliability requirements. Challenges of achieving reliable multimedia services include limited battery resources at mobile nodes, coupled with hostile propagation environments. We believe that adaptive signaling techniques can be designed to take advantage of differences in the quality of service (QoS) requirements among different types of multimedia traffic besides improving spectral efficiency. Furthermore, we also demonstrate that it is essential to have a readily invertible equation for different multiresolution modulation types in order to automatically execute an Adaptive Multiresolution Modulation (AMM) scheme. Exponential approximation was used for generating invertible expression for asymmetrical quadrature amplitude modulation. We also generated the curve fitting approximations for the average BER probability and individual BER for 4-PSK, 8-PSK, 16-QAM and 64-QAM by using the complementary error function approximation. In this article, we demonstrate the efficacy of the complimentary error function approximation as a better curve fitting approximation in comparison to exponential approximation. We also illustrated the benefits that can be gained from using the adaptive multiresolution modulation.