一种优化的OFDM系统同步方案

提出了一种在OFDM系统中低复杂度的符号和载波频率同步方案。该方案利用接收序列(解调以前)和本地已知序列的相关性,获得符号同步;利用OFDM信号中的保护间隔,也即一帧中的循环前缀(CP)与末尾部分的相关性,获得频率粗同步;分析了该算法的性能,给出其在噪声信道、频率选择性衰落信道中的仿真结果。结果表明,所提出的算法不仅具有低复杂度的可实现性而且有较高的精度。

An Optimum Low- Complexity Frame and Frequency Synchronization for OFDM Systems

In this paper, we present an optimum frame and carrier frequency synchronization with low - complexity and high- precision for OFDM system. This scheme utilizes the correlation between the received - dates (before FFT) and the saved - dates to obtain the frame synchronization; uses the correlation between the cyclic prefix and the end part of a frame to acquire the coarse frequency synchronization; exploits the received - dates (after FFT) and the saved - dates to obtain the fine frequency synchronization in order to enhance the frequency offset scale and system performance. Analyze the performance of this arithmetic and present the computer simulation under linear channel of frequency - offset and/ or additive Gaussian noise (AWGN). The results showed that this arithmetic has relatively high precision.