Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) can provide higher spectral efficiency and lower out-of-band spectral/power leakages than conventional orthogonal frequency-division multiplexing with QAM (OFDM/QAM). Due to the imperfect frequency response of electrical/optical devices and various interferences, significant subcarrier SNR fluctuation may result in poor bit error rate (BER) performance. In this work, channel-independent precoding techniques are employed for the short-reach FBMC/OQAM-based intensity-modulated and direct-detection (IMDD) system. Four commonly used precoding techniques are experimentally investigated in a directly-modulated laser-based IMDD FBMC/OQAM and OFDM/QAM systems over a 20-km fiber link. The relevant results exhibit that the receiver sensitivity of these two systems can be improved by about 2 dB with precoding techniques at the BER of 3.8e-3. A slight BER enhancement can also be achieved by the precoded FBMC/OQAM compared to the precoded OFDM/QAM.

中文翻译：

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用于短距离 IMDD 传输的预编码 FBMC/OQAM

与具有 QAM 的传统正交频分复用 (OFDM/QAM) 相比，具有偏移正交幅度调制 (FBMC/OQAM) 的滤波器组多载波可以提供更高的频谱效率和更低的带外频谱/功率泄漏。由于电/光设备的不完美频率响应和各种干扰，显着的副载波信噪比波动可能导致较差的误码率（BER）性能。在这项工作中，基于短距离 FBMC/OQAM 的强度调制和直接检测 (IMDD) 系统采用了与信道无关的预编码技术。在基于直接调制激光的 IMDD FBMC/OQAM 和 OFDM/QAM 系统中，通过 20 公里光纤链路对四种常用的预编码技术进行了实验研究。相关结果表明，在误码率为3.8e-3的情况下，采用预编码技术，这两个系统的接收机灵敏度可以提高约2 dB。与预编码的 OFDM/QAM 相比，预编码的 FBMC/OQAM 也可以实现轻微的 BER 增强。