Vector Coding Optical Wireless Links
Vector Coding Optical Wireless Links
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DOI：
10.1109/jlt.2023.3265628
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发表时间：
2023-09
影响因子：
4.7
通讯作者：
Ravinder Singh;Timothy O’Farrell;M. Biagi;R. Penty;J. David
中科院分区：
文献类型：
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作者：
Ravinder Singh;Timothy O’Farrell;M. Biagi;R. Penty;J. David
光无线信道的准静态特性意味着在数据传输之前，发射器和接收器可以轻松获得信道状态信息 (CSI)。这意味着电带限光无线通信（OWC）系统可以利用最佳信道划分或基于矢量编码的多信道调制（MCM），通过减轻光和电信道产生的非线性来实现高吞吐量。本文提出了一种用于 OWC 的基于脉冲幅度调制 (PAM) 的直流偏置光矢量编码 (DCO-VC) MCM 方案。评估了 DCO-VC 的吞吐量性能，并将其与具有加性高斯白噪声的混合（视距和漫射）和漫射（仅非视距）可见光通信 (VLC) 信道上众所周知的 DC 偏置光学正交频分复用 (DCO-OFDM) 进行了比较。为了VLC物理层的完整性，性能比较是基于使用众所周知的卷积码和维特比解码器的未编码和前向纠错传输模式。结果表明，编码的 DCO-VC 在混合和扩散 VLC 信道上分别实现了高达 2 和 3 dB 的信噪比增益，从而优于 DCO-OFDM 系统。
The quasi-static nature of the optical wireless channel means that the channel state information (CSI) can be readily available at the transmitter and receiver prior to data transmission. This implies that electrically band-limited optical wireless communication (OWC) systems can make use of optimal channel partitioning or vector coding based multi-channel modulation (MCM) to achieve high throughput by mitigating the non-linearities arising from the optical and electrical channel. This paper proposes a pulse amplitude modulation (PAM) based DC-biased optical vector coding (DCO-VC) MCM scheme for OWC. The throughput performance of DCO-VC is evaluated and compared to the well known DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) over hybrid (line-of-sight and diffuse) and diffuse (non line-of-sight only) visible light communication (VLC) channels with additive white Gaussian noise. For the completeness of the VLC physical layer, the performance comparison is based on an uncoded and a forward error correction transmission mode using well-known convolutional codes with Viterbi decoder. The results show that the coded DCO-VC outperforms DCO-OFDM system by achieving up to 2 and 3 dB signal to noise ratio gains over hybrid and diffuse VLC channels, respectively.