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The paper explores the relay-assisted IVC (Inter-Vehicular Communication) systems with double-Rayleigh fading V2V (Vehicle-To-Vehicle) links for both APA (Access Point Assisted) and VA (Vehicle Assisted) schemes. The OPA (Optimal Power Allocation) solutions are derived through maximizing source-to-destination channel capacity assuming amplify-and-forward relaying. Furthermore, the outage performance is discussed and the lower bounds on outage probabilities at medium to high SNRs (Signal-to-Noise Ratios) are presented for both APA and VA systems. Simulations manifest that the outage performance can be improved about 2dB gains through OPA method over EPA (Equal Power Allocation) solution and the lower bounds coincide with the exact outage probabilities well at medium SNRs.
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