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针对基于OFDM的协作通信系统,主要研究了解码转发(DF)协议下的时间与载波频率同步技术。设计了一种新的训练序列结构,它能在一个OFDM符号的长度下同时实现多个时间偏移与载波频率偏移的估计。通过相关类型的算法得到时间偏移估计,同时通过基于子空间分解的算法得到载波频率估计。调整训练序列的结构能够使得系统的误差最小,从而获得最优的系统性能。
Aiming at the cooperative communication system based on OFDM, the technology of time and carrier frequency synchronization in decoding and forwarding (DF) protocol is mainly studied. A new training sequence structure is designed, which can estimate multiple time offsets and carrier frequency offsets simultaneously at the length of one OFDM symbol. The time-shift estimation is obtained by the relevant type of algorithm, and the carrier frequency estimation is obtained by an algorithm based on subspace decomposition. Adjusting the structure of the training sequence can minimize the system error and achieve the best system performance.