Abstract
Non-orthogonal multiple access (NOMA) has been studied in visible light communication (VLC) systems such as direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) for higher spectral efficiency. To ensure the unipolarity of optical signals, clipping is adopted and makes a difference. However, few works on the NOMA with DCO-OFDM (NOMA-DCO-OFDM) system pay attention to the impact of clipping noise. In this paper, the double-sided clipping process and the achievable rate region are depicted and analyzed in the NOMA-DCO-OFDM system. The issue of obtaining the boundary of the achievable rate region in a two-user NOMA scenario can be transformed into two optimization problems. Comparison of achievable rates between NOMA-DCO-OFDM and orthogonal multiple access with DCO-OFDM (OMA-DCO-OFDM) is performed by analytic and simulation results. Numerical results demonstrate that the boundary of achievable rate region cannot be achieved at a fixed DC-offset, and the NOMA-DCO-OFDM system is superior in achievable rate to the OMA-DCO-OFDM system. Moreover, different total power constraint and clipping levels influence the achievable rate region of NOMA-DCO-OFDM system.
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