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This paper analyzes the performance of cooperative hybrid automatic repeatrequest with incremental redundancy (HARQ-IR) and proposes a new approach ofoutage probability approximation for performance analysis. A generaltime-correlated Nakagami fading channel covering fast fading and Rayleighfading as special cases is considered here. An efficient inverse momentmatching method is proposed to approximate the outage probability inclosed-form. The effect of approximation degree is theoretically analyzed toease its selection. Moreover, diversity order of cooperative HARQ-IR isanalyzed. It is proved that diversity order is irrelevant to the timecorrelation coefficient $\rho$ as long as $\rho<1$ and full diversity from bothspatial and time domains can be achieved by cooperative HARQ-IR undertime-correlated fading channels. The accuracy of the analytical results isverified by computer simulations and the results reveal that cooperativeHARQ-IR scheme can benefit from high fading order and low channel timecorrelation. Optimal rate selection to maximize the long term averagethroughput given a maximum allowable outage probability is finally discussed asone application of the analytical results.

Inverse Moment Matching Based Analysis of Cooperative HARQ-IR over Time-Correlated Nakagami Fading Channels