Abstract
We study the information rates of several unipolar orthogonal frequency division multiplexing (OFDM) schemes in discrete-time Gaussian optical intensity channels under average optical power constraint. All our results are derived under the assumption that i.i.d. complex Gaussian codebook ensemble and nearest neighbor decoding (minimum Euclidean distance decoding) are used. Results for single-component schemes are obtained by considering the frequency domain equivalent models; results for double- and multi-component schemes are obtained based on successive decoding, interference cancellation, and results for single-component schemes. In particular, we prove that the spectrally and energy efficient OFDM (SEE-OFDM, also known as layered ACO-OFDM) achieves the asymptotic capacity of the discrete-time Gaussian optical intensity channel under average power constraint to within 0.07 bits at high SNR.
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