In this paper,we investigate and compare the performance of three digital signal processing (DSP) based transmission technologies for indoor visible light communication (VLC).These schemes include orthogonal frequency division multiplexing (OFDM),single carrier frequency domain equalization (SCFDE),and single-carrier frequency division multiplexing (SCFDM).Particularly,we analyze their peak-to-average power ratio (PAPR) and computational complexity for comparison.Our results indicate that SCFDE and SCFDM system have relatively low PAPR while SCFDM has the highest complexity.Besides,we present a hardware prototype for the three modulation methods using a white LED lamp.Experimental results show that,due to their low PAPR,SCFDE and SCFDM outperform OFDM in aspects of bit error rate (BER) and Q factor performances in VLC transmission.