摘要
A new training symbol weighted by pseudo-noise(PN) sequence is designed and an efficient timing and fre-quency offset estimation scheme for orthogonal frequency division multiplexing(OFDM) systems is proposed. The timing synchronization is accomplished by using the piecewise symmetric conjugate of the primitive training symbol and the good autocorrelation of PN weighted factor. The frequency synchronization is finished by utilizing the training symbol whose PN weighted factor is removed after the timing synchronization. Compared with conventional schemes, the pro-posed scheme can achieve a smaller mean square error and provide a wider frequency acquisition range.
A new training symbol weighted by pseudo-noise（PN） sequence is designed and an efficient timing and frequency offset estimation scheme for orthogonal frequency division multiplexing（OFDM） systems is proposed. The timing synchronization is accomplished by using the piecewise symmetric conjugate of the primitive training symbol and the good autocorrelation of PN weighted factor. The frequency synchronization is finished by utilizing the training symbol whose PN weighted factor is removed after the timing synchronization. Compared with conventional schemes, the proposed scheme can achieve a smaller mean square error and provide a wider frequency acquisition range.
基金
Supported by the National High Technology Research and Development Program of China ( "863" Program, No.2006AA01Z270)
Natural Science Foun-dation of Shaanxi Province (No. 2007F07)
Natural Science Foundation of Guangdong Province (No. U0635003)
National "111" Program of Intro-ducing Talents of Discipline to Universities (No. B08038)
关键词
OFDM
正交频分复用技术
通信信号处理
无线电通信
orthogonal frequency division multiplexing （OFDM） technique
time synchronization
frequency synchronization
training symbol
