【摘要】 采用训练序列与级联符号内频域平均(intra-symbol frequency-domain averaging,ISFA)的信道估计方法提高了直接检测光正交频分复用(OFDM)接收机中信道估计的准确性。通过Matlab编程建立了强度调制直接检测系统仿真平台,对不同调制格式的OFDM信号进行了数值仿真分析。结果表明,级联ISFA方法可以提供更为准确的信道估计,有效改善高阶QAM调制的OFDM信号误码性能,提高接收机的灵敏度。更多还原

【Abstract】 A training sequence(TS) and cascade intra-symbol frequency-domain averaging(ISFA) method is proposed to improve the accuracy of channel estimation in intensity modulated and directly-detection optical orthogonal frequency-division multiplexing(IMDD-OOFDM) systems. The simulation platform of IMDD is established by employing mathworks Matlab software,and then the numerical simulation analysis of the system with different modulation formats and cascaded ISFA is also performed. The results show that the cascaded ISFA method can provide more accurate channel estimation,and effectively improve the bit error ratio performance of high-order QAM modulated OFDM signal and receiver sensitivity.更多还原