In this paper, a radio-over-fiber (RoF) design for wireless local area networks (WLANs) on the 5GHz radio frequency band is proposed as an effort to alleviate radio frequency spectrum scarcity and allow frequency re-use. The design incorporates two multiplexing schemes, subcarrier multiplexing (SCM) for increasing the efficiency of radio frequency in the last mile, and MDM for converging several sets of radio subcarriers from different locations into a high-speed optical signal through a single multimode fiber backbone. The effects of different radio channel spacing on the system performance were investigated. A total throughput of 19.5 Gb/s is achieved, 6.5Gb/s per each of the three radio channels.