Hybrid OFDM/OOK Modulations in OCDMA Scheme for Free Space Optics
The study proposes hybrid analog/digital transmission format scheme which integrated optical code-division multiple-access (OCDMA) and polarization multiplexing technique in free space optics (FSO) transmission. Orthogonal frequency division multiplexing (OFDM) transmits as the analog format and (on-off keying) OOK transmits as digital format in the study, respectively. In the proposed hybrid OCDMA system, it has high-speed transmission, signal security and low cost…etc. The multiple access interference (MAI) can be efficiently eliminated by using the balanced detection scheme at the receive end.
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