摘要
由于OFDM本身对定时误差比较敏感,因此定时估计是准确实现整个系统同步的关键技术之一。Schemidl&D.Cox提出的算法是利用前导训练序列做自相关来定时同步,虽然这种算法对符号同步估计很有效,但在多径衰落和信道噪声的影响下同步性能不高。对此提出新的改善算法,设计新的训练序列作为前导字及改进自相关序列,通过MatLab模拟仿真和分析可以看出,改善的算法使同步性能得到明显提高。
Due to the sensitivity of OFDM to timing errors,timing estimation is one of the key techniques for precisely realized synchronization of the OFDM system.The symbol synchronizing algorithm proposed by SchemidlD.Cox utilizes prefixed training sequence as the autocorrelation to synchronize timing.Though this algorithm is very effective for symbol synchronization estimation,its synchronizing performance is less satisfied under the influence of channel noise and multi-path fading.Through designing new training sequence and improving correlation sequence,a new enhanced algorithm is proposed.Through matLab analog simulation and analysis,it is demonstrated that the algorithm is very effective in enhancing synchronization performance.
出处
《铁道通信信号》
2011年第4期74-76,共3页
Railway Signalling & Communication
关键词
OFDM
同步算法
定时估计
OFDM
Synchronizing algorithms
Timing estimation
