摘要
分析了60 GHz正交频分复用技术光纤无线通信系统中的子载波互拍及频率选择性衰落.提出利用里德-所罗门码级联网格编码调制技术结合符号交织来降低两者对系统性能的不良影响.采用符号交织来分散正交频分复用中子载波上的误码,然后通过高码率的里德-所罗门码级联实用的网格编码调制技术来纠正比特错误.仿真结果表明:经过符号交织后,误码在子载波上的分布变得较均匀,有利于纠错;2.5 Gb/s正交频分复用信号采用RS-PTCM-64QAM方案比采用未编码的16QAM调制提高了5 dB左右的接收机灵敏度.
SSMI and FF in 60 GHz OFDM-RoF system were analyzed.RS code concatenated with PTCM and symbol interleaver were applied in the 60 GHz OFDM-RoF system to reduce the these bad impacts of optical fiber.Using symbol interleaver to scatter errors in the sub-carries of OFDM,RS with high code rate concatenated with PTCM could correct bit errors caused by inter-subcarrier interference and frequency fading to improve the performance of system.Simulation results show that errors in sub-carriers become well-distributed and will be favorable for error correction.The receiver sensitivity of 2.5 Gb/s OFDM signal adopted the 64QAM modulation format with RS-PTCM can save up to 5 dB receive power relative to 2.25 Gb/s OFDM signal with the uncoded 16QAM scheme.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2011年第7期983-988,共6页
Acta Photonica Sinica
基金
国家自然科学基金(No.60977049)
国家高技术研究发展计划(No.2009AA01Z220
No.2009AA01Z222)
湖南省科技计划项目(No.2009FJ3131)资助
关键词
光通信
光纤无线通信系统
网格编码调制技术
光载毫米波
正交频分复用
Optical communications
Radio-over-Fiber
Trellis coded modulation
Optical millimeter-wave
Orthogonal frequency division multiplexing
