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A scheme that combines 256/128/64 quadrantal amplitude modulation (QAM) adaptive modulation with constant amplitude zero autocorrelation sequence (CAZAC) precoding in a multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband over fiber (UWBoF) system is proposed in this paper. CAZAC precoding enables a relatively balanced signal-to-noise ratio (SNR) within each band, and the use of adaptive modulation optimizes the upper limit of transmission performance in each subband. Simulation results show that CAZAC precoding combined with 256/128/64QAM and conventional 64QAM reduces the peak-to-average power ratio (PAPR) by 1 dB and 0.5 dB, respectively. The proposed scheme achieves PAPR performance comparable to conventional 64QAM. It confirms that CAZAC precoding performs better in the reduction of PAPR and bit error rate (BER) when combined with the 256/128/64QAM scheme.
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Xiang et al. (2024) studied this question.
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