作　　者： ; ; ; ;

机构地区： 重庆邮电大学

出　　处： 《光通信研究》 2011年第6期38-40,47,共4页

摘　　要： 针对插入序列降低频带利用率的问题,提出了叠加序列的时间同步方法。通过将复数序列构造具有共轭对称结构,IF-FT(快速傅里叶逆变换)后得到实数具有镜像反函数特性的序列线性叠加在OFDM(正交频分复用)符号上,解决了传统插入序列独占发射功率的缺陷。仿真表明,与传统方法相比,该方法在低信噪比下具有更高的同步准确率,同时提高了系统频谱利用率。 As the conventional insertion sequence lowers the bandwidth efficiency,a superimposed training sequence timing synchronization method is proposed.Using the complex sequence in the time domain,a conjugate symmetrical structure is constructed and the sequence linearity with mirror inverse function features of the real numbers obtained after IFFT is linearly superimposes on OFDM symbols so as to remove the drawback that the traditional insertion sequence monopolizes the transmitting power.Simulation results indicate that compared with the conventional ones,this method has higher synchronization accuracy rate and improves the system spectrum efficiency in low SNR.

关 键 词： 非均匀限幅光正交频分复用 叠加训练序列 时间同步

领　　域： [电子电信] [电子电信]