论文部分内容阅读
为了验证在光正交频分复用(OOFDM)通信系统中,导频插入方式对系统补偿性能的影响,寻找适合OOFDM系统补偿技术的导频插入方式,以实现OOFDM系统的长距离传输,首先,介绍了无线OFDM中三种典型的导频插入方式,然后,用VPI Transmission maker搭建一个OOFDM仿真系统,作为模拟传输平台。最后,采用一种简单、准确的信道估计算法,利用插入的导频估计出信道信息,并对接收到的信号进行相应的补偿,比较三种导频插入方式的补偿效果。仿真结果表明:时域块状导频插入方式和斜对角导频插入方式,经500km传输后补偿后的误码率为10-5量级,其中斜对角的效果更好一些;而频域块状导频插入方式达到相同的误码率数量级时,只能传输300km。三种导频插入方式中,时域块状导频和斜对角导频估计补偿效果更好,更适合光OFDM通信系统。
In order to verify the impact of pilot insertion on system performance in optical Orthogonal Frequency Division Multiplexing (OOFDM) communication systems and to find a suitable pilot insertion method for OOFDM system compensation in order to achieve long-distance transmission of OOFDM systems, firstly , Introduces three typical pilot insertion methods in wireless OFDM, and then builds an OOFDM simulation system with VPI Transmission Maker as an analog transmission platform. Finally, a simple and accurate channel estimation algorithm is used to estimate the channel information by using the inserted pilots. The received signals are compensated accordingly, and the compensation effect of the three pilot insertion modes is compared. The simulation results show that the time-domain block pilot insertion method and oblique diagonal pilot insertion method have a bit error rate of 10-5 order of magnitude after being transmitted after 500km transmission, of which the effect of diagonal angle is better; while the frequency Domain block pilot insertion method to achieve the same order of magnitude error rate, can only transmit 300km. Among the three pilot insertion modes, the time-domain block pilot and the diagonal pilot estimation have a better compensation effect and are more suitable for the optical OFDM communication system.