An Efficient Encoder-Subcarrier Mapping Method Combined With Polar Code for Visible Light Communication

Abstract

A spectral efficient light emitting diode (LED)-based visible light communication (VLC) system adopting polar-coded 128 quadrature-amplitude modulations (QAM) orthogonal frequency division multiplexing (OFDM) is experimentally demonstrated. To overcome frequency fading in the VLC system, an encoder-subcarrier mapping method is proposed. The experimental results show that, at a sampling rate of AWG with 150 MSa/s, it can realize error-free transmission with high-spectral efficiency (SE) up to 5.77 bit/s/Hz using the proposed method. Its SE is 1.3 times of the un-coded system adopting 16-QAM. At a sampling rate of 175 MSa/s, its measured Q-factor is 9.86 dB, which improves by 5.12 dB compared to the case without coding. INDEX TERMSVisible light communication (VLC), orthogonal frequency division multiplexing (OFDM), quadrature-amplitude modulation (QAM), polar code.

Combined Polar Codes and 2-12 QAM Applied to 5G Communications

“…In order to overcome this difficulty a possible approach is to develop a scheme that combines the standard polarization kernel with an elaborate 7 × 7 design kernel [12], [13]. In order to reduce the complexity of code construction and decoding algorithm in this article an uncoded suffix of zeros corresponding to s = 7 − (N mod 7) is added to each codeword [15]. Then, this modified codeword x ′ , with suffix s, has length N s given by…”

“…However, both solutions require a high computational complexity. Another solution, which consists of appending a suffix of zeros to each codeword, can be employed in order to reduce computational complexity [15].…”

Combined Polar Codes and 2-12 QAM over AWGN and Rayleigh Fading Channels

“…In order to circumvent this difficulty a possible approach is to develop a scheme that combines the standard polarization kernel with an elaborate 7 × 7 design kernel [15], [16]. In order to reduce the complexity of code construction and decoding algorithm in this article an uncoded suffix of zeros corresponding to s = 7 − (N mod 7) is added to each codeword [18]. Then this modified codeword…”

“…Another alternative is the Arikan punctured kernel matrix [17], however both solutions require a high computational complexity. Another solution, which consists of appending a suffix of zeros to each codeword, can be employed in order to minimize computational complexity [18].…”

Emission-intensity-enhanced GaN-based LED based on multilayer grating structures

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