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分析了60 GHz正交频分复用-光载无线通信(OFDM-RoF)系统中OFDM信号经光纤传输后在光电检测时存在的子载波间互拍干扰(SSBI)现象。提出使用交叉型训练序列结构的OFDM信号来降低SSBI的影响。实验证明,在无色散补偿的情况下,2.5 Gb/s交叉型训练序列结构的基带OFDM信号在58 GHz毫米波系统中经光纤传输20 km后,在误码率为10-3时,其功率代价仅为0.5 dB,而连续型训练序列结构OFDM的功率代价为2 dB。说明基于交叉型训练序列结构的OFDM信号的传输性能在抵抗SSBI方面要明显优于连续型训练序列结构OFDM信号。
The inter-subcarrier Inter-Carrier Interference Interference (SSBI) phenomenon in the 60 GHz Orthogonal Frequency Division Multiplexing-Optical-Radio Communication (OFDM-RoF) system after optical fiber transmission is analyzed. It is proposed to reduce the influence of SSBI by using OFDM signal with cross training sequence structure. Experiments show that in the case of no dispersion compensation, the baseband OFDM signal with 2.5 Gb / s cross-training sequence structure transmits 20 km in 58 GHz millimeter-wave system and the bit error rate is 10-3, the power The cost is only 0.5 dB, while the power cost of continuous training sequence structure OFDM is 2 dB. It shows that the transmission performance of OFDM signal based on the cross-training sequence structure is obviously better than the continuous training sequence structure OFDM signal in resisting SSBI.