Abstract
Multi-class channel coded layered asymmetrically clipped optical orthogonal frequency-division multiplexing (LACO-OFDM) is proposed, where the achievable rate of the system is derived based on our mutual information analysis. We conceive a multi-class channel encoding scheme integrated with the layered transmitter. At the receiver, both the coded and uncoded likelihood ratios are extracted for inter-layer interference cancellation and symbol detection, respectively. Simulations are conducted, and the results show that our design approaches the achievable rate within 1.1 dB for 16-QAM four-layer LACO-OFDM with the aid of a half-rate eight-iteration turbo code at $\text {BER}=10^{-3}$ , outperforming its conventional counterpart by about 3.6 dB.
Highlights
V ISIBLE light communications (VLC) constitutes a promising optical wireless technique, which has been rapidly developed into a practical solution [1], [2]
Our results demonstrate that the proposed coded LACO-orthogonal frequency division multiplexing (OFDM) system significantly outperforms the benchmark system consisting of a separate forward error correction (FEC) and LACO-OFDM scheme in terms of its bit error ratio (BER) performance as well as the decoding complexity
A layered channel coding system was proposed for optical intensity modulation combined with direct detection (IM/DD) communications
Summary
V ISIBLE light communications (VLC) constitutes a promising optical wireless technique, which has been rapidly developed into a practical solution [1], [2]. The data to be transmitted may be mapped to the frequency domain (FD) representation of the O-OFDM signal by obeying the Hermitian symmetry, which is capable of guaranteeing pure real-valued time domain (TD) symbols after the inverse fast Fourier transform (IFFT) based modulation This requires the first half of the FD symbols to be the conjugate of the rest, as detailed in [6]. According to [13], LACO-OFDM embeds additional ACO-OFDM layers within the classic ACO-OFDM frame, which occupy the blank evenindexed ACO-OFDM subcarriers, enhancing the spectral efficiency This is achieved at the cost of interlayer interference (ILI). Wang et al [20] conceived an improved detection method, which exploits the TD signal for reducing the ILI Another improved LACO-OFDM receiver relying on soft SIC was proposed by T.
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