Adaptive MultireSolution Modulation for Multimedia Traffic over Nakagami Fading Channels

Future wireless communications networks will be required to support a multitude of services withdifferent reliability and latency requirements. However, achieving such flexible systems are challengingin Mobile Ad-hoc Networks (MANET) due to limited battery resources, node mobility, changes in pathattenuation, and fluctuations in interference. By employing adaptive signaling techniques with UnequalError Protection (UEP) to take advantage of the differences in the quality of service (QoS) requirementsamong different types of multimedia traffic, energy efficiency can be improved and also increase the datarate (spectral efficiency) over a fading channel, especially at low and moderate Carrier-to-Noise Ratio(CNR). This paper proposed a combination of curve fitting techniques that derives an exponentialapproximation to the average packet error rate (PER) probabilities as well as individual PERprobabilities for asymmetrical phase-shift keying (PSK) and asymmetrical Quadrature AmplitudeModulation (QAM). Our design is both simpler and more robust than existing schemes.