CAJ | 학술논문

为了论述一种适于多径衰落信道的OFDM时间同步新方法:首先,将接收的信号乘上其共轭得到信号的能量;然后,进行问隔为OFDM数据符号长度减去循环前缀(CP)长度的能量差分得到相关晒数;最后,联合多个符号的块采样进行同步估计.由于利用了信号能量的差分关系,使得同步峰更加明显,再联合多个符号的估计,更加强了同步的稳定性.在多径衰落信道下进行仿真,结果表明,不但能获到较好的符号定时同步性能,而且还消除了频偏对于符号定时的影响.
위료논술일충괄우다경쇠락신도적OFDM시간동보신방법:수선,장접수적신호승상기공액득도신호적능량;연후,진행문격위OFDM수거부호장도감거순배전철(CP)장도적능량차분득도상관쇄수;최후,연합다개부호적괴채양진행동보고계.유우이용료신호능량적차분관계,사득동보봉경가명현,재연합다개부호적고계,경가강료동보적은정성.재다경쇠락신도하진행방진,결과표명,불단능획도교호적부호정시동보성능,이차환소제료빈편대우부호정시적영향.
A novel time synchronization algorithm suited for multi-path fading channel is proposed. First, the received signals are multiplied by the conjugate to acquire the signal energy, then the correlation function is acquired by carrying out the energy differential operation with the interval of the length of OFDM data symbol part minus the length of cyclic prefix (CP), finally timing synchronization is estimated by uniting the multiple symbols sampling. Because of taking advantage of differential operation of the signal energy, the synchronous peak is clearer, and the estimation of multiple symbols strengthens the stability of synchronization. The simulation shows that the proposed al-gnrithm can acquire a better performance of symbol timing, and remove the impact of frequency offset.