Adaptive Multiresolution Modulation for Multimedia Traffic over Nakagami Fading Channels

Future wireless communications networks will be required to support a multitude of services with different reliability and latency requirements. However, achieving such flexible systems are challenging in Mobile Ad-hoc Networks (MANET) due to limited battery resources, node mobility, changes in path attenuation, and fluctuations in interference. By employing adaptive signaling techniques with Unequal Error Protection (UEP) to take advantage of the differences in the quality of service (QoS) requirements among different types of multimedia traffic, energy efficiency can be improved and also increase the data rate (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 exponential approximation to the average packet error rate (PER) probabilities as well as individual PER probabilities for asymmetrical phase-shift keying (PSK) and asymmetrical Quadrature Amplitude Modulation (QAM). Our design is both simpler and more robust than existing schemes.