Abstract-We propose a novel aperture selection (ApS) scheme for asymmetrically clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) based multiple transmit/receive aperture (MTRA) system communicating over a free-space optical (FSO) turbulence channel between a pair of cooperating base-stations in a vehicular communication system. Our proposed ApS scheme is capable of significantly improving both the system's achievable diversity gain, its bit error ratio as well as its throughput, while imposing a substantially reduced power consumption and hardware complexity. Our results demonstrate that the proposed system's performance was improved more significantly under strongly turbulent channel conditions. Index Terms-Free-space optical turbulence channel, asymmetrically clipped optical orthogonal frequencydivision multiplexing, multiple transmit/receive aperture, aperture selection