Abstract
In this letter, to mitigate the decrease of the received optical power caused by scattering, attenuation and reflection in underwater optical wireless communication (UOWC) system, geometrically shaped (GS) 64-ary quadrature amplitude modulation (QAM) based orthogonal frequency division multiplexing (OFDM) is proposed and experimentally demonstrated in UOWC system. And low-density parity-check codes (LDPC) are employed. By using soft decoding algorithm of LDPC, the complexity of demodulation for GS 64-QAM is the same as the uniform 64-QAM. The experimental results show that, the data rate of GS 64-QAM OFDM signal can achieve 3.33Gbps after transmission over 4.2m underwater and 5m free space channel. Compared with the uniform 64-QAM scheme, the proposed scheme can improve the receiver sensitivity of 0.8dB at the bit-error rate (BER) of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3.8\times 10^{-3}$ </tex-math></inline-formula> .
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