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针对矿井下OFDM系统对载波频偏敏感的特点,对井下OFDM系统帧检测和载波同步两个同步过程进行了算法改进研究与硬件设计。结果表明,改进同步算法能够在不失估计范围的情况下使误差与载波间隔的比值维持在10-2以下,并能够在FPGA硬件平台实现。在矿山实验室模拟环境中,改进同步算法把频率误差范围控制在10～50kHz之间,较原算法效果提升明显,具备一定的实际意义。
Aiming at the characteristics that the OFDM system in the mine is sensitive to the frequency offset of the carrier, the algorithm improvement research and hardware design are carried out for the two synchronous processes of frame detection and carrier synchronization in the downhole OFDM system. The results show that the improved synchronization algorithm can keep the ratio of error to carrier spacing below 10-2 without loss of estimation range, and can be implemented in FPGA hardware platform. In the mine laboratory simulation environment, the improved synchronization algorithm can control the frequency error range between 10 ~ 50kHz, which is more effective than the original algorithm and has certain practical significance.