In the paper, a rotated quadrature amplitude modulation (QAM) based discrete multi-tone (DMT) is proposed and experimentally demonstrated in underwater optical wireless communication (UOWC). After transmission over 2.4-m water channel and 10-m free space, the experimental results show that, compared with conventional 16-QAM DMT, the received optical power (ROP) is improved 3.3dB at the bit error rate (BER) of 10-5 using the rotated QAM based DMT. In addition, for the rotated 32-QAM DMT, the receiver sensitivity can enhance 3.5dB compared with conventional 32 QAM DMT. And compared to DMT with bit loading, it is improved 1dB at the BER of 10-3.
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