A Unified Method for Asymptotic Outage Analysis.

This letter develops a unified method to perform the asymptotic analysis of the outage probability for a general wireless communication system. On the basis of the asymptotic results, the diversity order and the modulation and coding gain are derived in closed-form together with some special mathematical properties. Moreover, this letter reveals the scaling law of the modulation and coding gain with respect to the diversity order that provides more useful insights. The small deviation theory is then applied to obtain the asymptotic outage expression at low transmission rate, with which the tradeoff between the energy efficiency and the reliability can be examined. Finally, Monte Carlo simulations are used to corroborate our theoretical analysis.