An Accurate Approximation of Delay with Nakagami-m Channels and Exponential Arrivals

The complementary cumulative distribution function (CCDF) of delay in a wireless communication system can be approximated by the effective capacity model. However, it is still unknown if such a distribution function can be approximated analytically and accurately. In this paper, we consider a system model with a Nakagami-m fading channel and an exponential arrival process, and derive a simple approximation formula for the CCDF of delay. Simulation results show that our formula is accurate in approximating the CCDF of delay in the system model considered above.