## 8 Conclusions
\begin{tabular}{l l} FSO & Free Space Optics \\ OBAN & Optical Body Area Network \\ BAN & Body Area Network \\ BIBD & Balanced Incomplete Block Design \\ EMI & Electromagnetic Interference \\ RF & Radio Frequency \\ OCDMA & Optical Code Division Multiple Access \\ BER & Bit Error Rate \\ CAPEX & Capital Expenditure \\ GR & Green Radio \\ PPM & Pulse Position Modulation \\ MAI & Multiple Access Interference \\ PIIN & Phase-Induced Intensity Noise \\ ZCC & Zero Cross-Correlation \\ ECG & Electrocardiogram \\ EEG & Electroencephalogram \\ SAC & Spectral Amplitude Coding \\ EMD & Enhanced Multi-Diagonal \\ IMDD & Intensity Modulation-Direct Detection \\ PD & Photodetector \\ PV & Permutation Vector \\ PDF & Probability Density Function \\ DW & Double Weight \\ DEU & Diagonal Eigenvalue Unity \\ \end{tabular}   
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