Abstract
To the best of the authors’ knowledge, this study is the first to combine two single-carrier frequency-division multiple accesses (SC-FDMAs) with soft clipping for optical wireless communication systems. By combining two SC-FDMAs, the spectral efficiency is increased. A simple, low-cost implementation is considered. A 50 mW blue laser with a wavelength of 405 nm is used in this experiment. The optimum driving voltage is 5.25 V. In situations in which only real components can be employed, intensity modulation/direct detection is adopted. From the experimental results, 128-QAM (quadrature amplitude modulation) is perfectly employed, and because of the avalanche photodiode, a bandwidth of only 100 MHz is used. As a result, a total speed of 261.1 Mbps can be achieved. By mixing the SC-FDMA with soft clipping of 3 dB, a peak-to-average power ratio reduction of 6 dB can be achieved with no bit-error rate performance degradation.
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