Improving the energy and spectral efficiency of LiFi systems using companding techniques

it requires a study using ieee template will propose an improved modulation technique for OFDM-based LiFi systems using compressing and expanding methods. The energy and spectral efficiency performance of the proposed technique will be compared with traditionally used DCO-OFDM.. the percentage of copy is not very important may by 30 or 40% acceptable but the content is important, the study requires simulation using matlab to prove the outputs