Underwater Optical CDMA for 5G Communication

UNDERWATER OPTICAL CDMA FOR 5G COMMUNICATION Introduction  5G requires high data rate, low latency underwater communication  Acoustics unsuitable due to low speed, high latency  Optical communication superior but suffers attenuation, turbulence  OCDMA enables asynchronous, secure multi-user communication Proposed System  Evaluates SAC-OCDMA with double weight codes  LED source, encoders, modulators for transmitting encoded signals  Combines signals and transmits through underwater channel  Receiver decodes signals using splitters, decoders, detectors Channel Modeling  Beer-Lambert law models attenuation and scattering losses  Gamma-gamma distribution for turbulence fading  Mathematical analysis for probability of error Results  Performance deteriorates from pure sea to coastal water  More transmitted power reduces error probability  Higher number of users increases error probability  Enhancement techniques needed for coastal water Conclusion  SAC-OCDMA provides secure, low latency communication  Works well in pure sea and clear ocean conditions  Degrades heavily in coastal water with high turbulence  Further research needed to improve coastal water performance Key Highlights  Optical CDMA suits 5G requirements of high data rate, low latency  Underwater channel impairments like attenuation, turbulence affectperformance

 Mathematical modeling provides error probability analysis  Performance acceptable in pure sea but degrades in coastal water  Enhancement techniques can help achieve desired error rates