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Vehicle-to-vehicle (V2V) communications under dense urban environmentsusually experience severe keyhole fading effect, especially for multi-inputmulti-output (MIMO) channels, which degrades the capacity and outageperformance due to the rank deficiency. To avoid these, the integration of MIMOand Type-I hybrid automatic repeat request (HARQ) is proposed to assist V2Vcommunications in this paper. By using the Meijer G-function, the outageprobability of the proposed V2V communications system is derived in closedform. With the result, meaningful insights are gained by conducting theasymptotic outage analysis. Specifically, it is revealed that full-timediversity order can be achieved, while full spatial diversity order isunreachable as compared to Type-I HARQ aided MIMO systems without keyholeeffect. Moreover, we prove that the asymptotic outage probability is amonotonically increasing and convex function of the transmission rate. Finally,the analytical results are validated through extensive numerical experiments.

Outage Performance Analysis of Type-I HARQ Aided V2V Communications