Simulation outcomes show that matlab programming performance of OFDM ROF system with matlab programming superior algorithm is much better than those with out adaptive modulation, and matlab programming BER of matlab programming former achieves 10e1 to 10e2 times less than matlab programming latter when SNR values gets larger. We can obtain that this low complexity adaptive modulation algorithm is extraordinarily useful for matlab programming OFDM ROF system. We suggest matlab novel ICI cancellation using opposite weighting on symmetric subcarrier pairs to combat matlab programming linear phase noise of laser source and matlab programming nonlinear phase noise resulted from matlab programming fiber nonlinearity. We compare matlab programming proposed ICI cancellation scheme with regular OFDM and matlab programming ICI self cancellation at matlab programming same raw bit rate of 35. 6 Gb/s. In simulations, matlab programming proposed ICI cancellation scheme shows better phase noise tolerance compared with regular OFDM and has identical phase noise tolerance with matlab programming ICI self cancellation.