Adaptively Biased Optical OTFS For Power-Constrained Visible Light Communication

Direct current biased optical orthogonal time frequency space (DCO-OTFS) scheme suffers relatively low power efficiency for the large DC bias due to the high peak to average power ratio (PAPR) of OTFS. Thus, it is not suitable for power-constrained scenarios. In this paper, we propose a power efficient adaptively biased optical OTFS (ABO-OTFS) scheme whose DC bias can be dynamically adjusted according to the signal samples at some specific positions. Numerical results have shown that the proposed ABO-OTFS has better bit error rate (BER) performance, lower PAPR, and higher power efficiency than existing DCO-OTFS.