光子学报, 2011, 40 (7): 983, 网络出版: 2011-08-10
基于RS码及网格编码调制技术的60 GHz OFDMRoF系统
60 GHz OFDMRoF System Based on RS Code Concatenated with PTCM Technology
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 RadiooverFiber Trellis coded modulation Optical millimeterwave Orthogonal frequency division multiplexing
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RSPTCM64QAM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.
Abstract
SSMI and FF in 60 GHz OFDMRoF system were analyzed. RS code concatenated with PTCM and symbol interleaver were applied in the 60 GHz OFDMRoF system to reduce the these bad impacts of optical fiber. Using symbol interleaver to scatter errors in the subcarries of OFDM,RS with high code rate concatenated with PTCM could correct bit errors caused by intersubcarrier interference and frequency fading to improve the performance of system. Simulation results show that errors in subcarriers become welldistributed and will be favorable for error correction.The receiver sensitivity of 2.5 Gb/s OFDM signal adopted the 64QAM modulation format with RSPTCM can save up to 5 dB receive power relative to 2.25 Gb/s OFDM signal with the uncoded 16QAM scheme.
曾冠军, 陈林, 余建军, 肖江南, 曹子峥, 李凡. 基于RS码及网格编码调制技术的60 GHz OFDMRoF系统[J]. 光子学报, 2011, 40(7): 983. ZENG Guanjun, CHEN Lin, YU Jianjun, XIAO Jiangnan, CAO Zizheng, Li Fan. 60 GHz OFDMRoF System Based on RS Code Concatenated with PTCM Technology[J]. ACTA PHOTONICA SINICA, 2011, 40(7): 983.