In this paper, we investigate the constellation design for the multiple-input single-output (MISO) dimmable visible light communication, where a total average- and a peak-intensity constraint are imposed on the channel input. An optimized spatial constellation is obtained by an equiprobable equally-spaced signal constellation (with a carefully-chosen minimum distance) concatenated with the minimum-energy signaling mapper. Error performance and rate loss of the proposed spatial constellation at high SNRs are evaluated as well. Numerical results show the performance advantage of our proposed constellation over the benchmarks.
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