CAZAC-based adaptative modulation scheme for the MB-OFDM UWBoF system

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....

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Bibliographic Details
Published in:Applied optics (2004) 2024-07, Vol.63 (19), p.5167
Main Authors: Xiang, Changqing, Zhou, Jingyang, Tan, Benxiang, Deng, Shuanglong, Tian, Dandan, Liu, Siyuan, Zhang, Kang, Li, Jingming, Zhou, Xuan
Format: Article
Language:English
Subjects:
Bit error rate
Orthogonal Frequency Division Multiplexing
Quadrature amplitude modulation
Signal to noise ratio
Ultrawideband
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Summary: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.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.528302