Abstract

In this paper, we derive the closed-form outage probability for decode-and-forward (DF) relay systems over Rayleigh fading channels. At first, our focus is on fixed-DF (FDF) relay schemes in which the probability density function (PDF) is derived based on error-event at relay nodes. It is confirmed that an erroneous detection and re-transmission at relay nodes affects both the received signal-to-noise ratio (SNR) and the outage probability. In addition, the developed analytical method is extended to adaptive-DF (ADF) schemes and the exact outage probability expression is derived. Simulation results are finally presented to validate the analysis.

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