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中文摘要：
提出采用低密度奇偶校验码-网络编码调制（LDPC—TCM）提高正交频分复用（OFDM）信号在60GHz光载无线通信（ROF）系统中的传输性能。研制了60GHzLDPC—TCMOFDM—RoF系统，实验比较LDPC—OFDM信号和LDPC—TCMOFDM信号在60GHz光载毫米波的性能，当误码率（BER）为10～时，经过光纤传输20km后，LDPC—OFDM信号的接收机灵敏度比原始OFDM信息提高了15dB，而LDPCTCMOFDM信号比LDPCOFDM信号提高1dB。结果说明，LDPC—TCMOFDM信号比LDPCOFDM信号在光链路传输系统中具有更佳的纠错能力和更能降低光链路中色散的影响。
英文摘要：
Low-density parity-check trellis coded mudulation （LDPC-TCM） code technology is experi- mentally investigated in 60 GHz orthogonal frequency division multiplexing radio-over-fiber （OFDM- RoF） system. The received sensitivity of OFDM signal with LDPC-TCM technology at the bit error rate （BER） of 10.3 after 100-km single mode fiber （SMF）-28 transmission is 15 dB better than the original OFDM signal without this technique. Moreover, the BER of OFDM signal with LDPC-TCM technology is 1 dB better than that with LDPC-OFDM technology. The experimental results show that the system with LDPC-TCM technology has both better dispersion compensation and low BER than that with LD- PC technology.
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