Complexity-reduced digital predistortion for subcarrier multiplexed radio over fiber systems transmitting sparse multi-band RF signals.
Complexity-reduced digital predistortion for subcarrier multiplexed radio over fiber systems transmitting sparse multi-band RF signals.
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DOI：
10.1364/oe.21.003708
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发表时间：
2013-02
期刊：
影响因子：
3.8
通讯作者：
Yinqing Pei;Kun Xu;Jianqiang Li;Anxu Zhang;Yitang Dai;Yuefeng Ji;Jintong Lin
中科院分区：
文献类型：
--
作者：
Yinqing Pei;Kun Xu;Jianqiang Li;Anxu Zhang;Yitang Dai;Yuefeng Ji;Jintong Lin
提出了一种新颖的多频带数字预失真（DPD）技术，用于线性化子载波复用光纤无线电（SCM-RoF）系统，该系统传输稀疏多频带射频信号，在组成射频频带之间具有大空白频谱。 DPD 在上变频和 RF 组合之前对每个单独 RF 频段的基带信号执行操作。通过忽略空白频谱，所提出的DPD技术的处理带宽大大降低，该带宽仅由每个单独RF频带的基带信号带宽决定，而不是由组合的多频带RF信号的整个带宽决定。实验演示是在直接调制的 SCM-RoF 系统中进行的，该系统在 2.4GHz 频段和 3.6GHz 频段上传输两个 64QAM 调制 OFDM 信号。结果表明，相邻信道功率 (ACP) 被抑制了 15dB，从而显着改善了两个频段上信号的 EVM 性能。
A novel multi-band digital predistortion (DPD) technique is proposed to linearize the subcarrier multiplexed radio-over-fiber (SCM-RoF) system transmitting sparse multi-band RF signal with large blank spectra between the constituent RF bands. DPD performs on the baseband signal of each individual RF band before up-conversion and RF combination. By disregarding the blank spectra, the processing bandwidth of the proposed DPD technique is greatly reduced, which is only determined by the baseband signal bandwidth of each individual RF band, rather than the entire bandwidth of the combined multi-band RF signal. Experimental demonstration is performed in a directly modulated SCM-RoF system transmitting two 64QAM modulated OFDM signals on 2.4GHz band and 3.6GHz band. Results show that the adjacent channel power (ACP) is suppressed by 15dB leading to significant improvement of the EVM performances of the signals on both of the two bands.