Affiliation:
1. Jishou University
2. Zhangjiajie Advanced Technical School
3. Harbin University of Science and Technology
4. Shaanxi Energy Institute
Abstract
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.
Funder
National Natural Science Foundation of
China
Education Department of Hunan
Province
Graduate Research Project of Jishou
University