Free space optics (FSO) systems have gained considerable attention because of their numerous features and services. It has evolved into a promising technology for high data rate transmission in wireless communication systems. However, there are some atmospheric effects which inhibit its performance. In this paper, performance of code division multiple access–free space optics (CDMA–FSO) by combining multidiagonal (MD) codes and orthogonal frequency division multiplexing–free space optics (OFDM-FSO) systems over using advance line coding formats under the sway of turbulence conditions are investigated and compared. A comparative study has shown that CDMA–FSO offers better SNR with both CSRZ and AMI coding format under diverse conditions at data rate 15 and 20 Gbps.
- Alternate mark inversion (AMI)
- Carrier suppressed return to zero (CSRZ)
- Code division multiple access (CDMA)
- Conventional free space optical system (C-FSO)
- Free space optics (FSO)
- Orthogonal frequency division multiplexing (OFDM)