Abstract
We propose a non-orthogonal multiple access (NOMA) scheme known as power domain sparse code multiple access (PD-SCMA) for visible light communications (VLC), which uses both the power and code domains for multi users signal transmission. The signal model and the transceiver of PD-SCMA VLC are investigated. We show by experimental demonstration that, PD-SCMA is a promising multiple access solution for VLC systems offering higher achievable sum rate compared with other NOMA schemes. PD-SCMA with 2 power domain multiplexed layers offers twice the total data rate compared with SCMA at the cost of reduced transmission distance, which is not a problem for VLC systems as the transmission distance can be increased using higher power light sources, high-gain optical concentrators and advanced receivers.
| Original language | English |
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| Pages (from-to) | 61-64 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 9 |
| Issue number | 1 |
| Early online date | 16 Sept 2019 |
| DOIs | |
| Publication status | Published - 1 Jan 2020 |