Modeling conditional FER for hybrid ARQ

This letter investigates the conditional frame error rate (FER) of hybrid automatic repeat request (HARQ) retransmission conditioned on its previous erroneous transmission. For simplification, it is called 'conditional FER' in this letter. On the basis of theoretical analysis, this letter validates the necessity of modeling conditional FER in wireless communication systems with HARQ and proposes a low-complexity implementation method. Simulation results prove the method's accuracy.