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中文摘要：
分析了60GHziE交频分复用一光载无线通信（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，2．5Gb／s交叉型训练序列结构的基带OFDM信号在58GHz毫米波系统中经光纤传输20km后，在误码率为10^-3时，其功率代价仅为0．5dB，而连续型训练序列结构OFDM的功率代价为2dB。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。
英文摘要：
There is signal-signal beating interference （SSBI） when the orthogonal frequency division multiplexing （OFDM） signal is detected by PIN after transmiting over the fiber in 60 GHz OFDM radio-over-fiber （RoF） system. The interleaved configuration of training sequence of OFDM signal is proposed to decrease the influence of the SSBI. The experimental results show that after the 2.5 Gb/s interleaved OFDM signal transmitting over 20 km single mode fiber in 58 GHz millimeter-wave system, the power penalty of the interleaved OFDM signal is only 0.5 dB at the bit error rate （BER） of 10-3 without dispersion compensation. In comparison, the power penalty of the continued OFDM signal under the same conditions is 2 dB. It is demonstrated that the fiber transmission performance of the interleaved OFDM signal is better than the continued OFDM signal in robust tolerance against SSBI.
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