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在Takahashi提出的盲同步算法的基础上,提出了一种OFDM多符号联合的差分盲同步算法。同Takahashi的算法一样,该算法利用OFDM符号的循环前缀内不被多径时延扩展所影响的那部分码元提取定时信息,但是为了避免电力线信道中随机的脉冲噪声对符号同步产生的影响,在每个定时时刻,取差值的前后移动平均,并采用多个OFDM符号的联合,以增强同步效果。仿真结果表明,在第一径为最强径或是非最强径的电力线多径衰落信道中,该算法取得了很好的符号同步效果。
Based on the blind synchronization algorithm proposed by Takahashi, a differential blind synchronization algorithm based on OFDM multi-symbol combination is proposed. Like Takahashi’s algorithm, the algorithm extracts timing information from the part of symbols within the cyclic prefix of an OFDM symbol that is not affected by multipath delay spread. However, in order to avoid the impact of random impulse noise in the power line channel on symbol synchronization, At each timing point, taking the difference before and after the moving average, and the use of a combination of multiple OFDM symbols to enhance the synchronization effect. The simulation results show that the proposed algorithm achieves good symbol synchronization in power line multipath fading channel with the first or second most powerful path.