随钻数据声波传输系统算法研究

油田井下随钻测斜数据的声波传输具有速率高等优点,具有广泛的应用前景。设计了基于LDPC和OFDM的声波传输系统,利用OFDM系统改善声波系统中码间干扰问题,仿真对比了LS、LMMSE、MMSE、SVD等算法,LS算法的误码性能较差,然而其复杂度较低,比较适合于井下数据的传输。为了增强系统的抗误码性能,提出了改进的LDPC译码算法,降低了系统的复杂度。

Research on Measurement Data While Drilling Sound Wave Transmission System

Oilfield underground measurement data while drilling sound wave transmission system will be widely applied for its transmission rate is relatively high. The measurement data while drilling sound wave transmission system is proposed, which exploits OFDM system to improve the ISI in sound wave system. Furthermore, many schemes such as LS, LMMSE, MMSE, SVD are simulated. The performance of LS is relatively low, however, it is suitable for underground data transmission for its simplicity. In order to enhance the error codes performance of the OFDM system, the improved LDPC is proposed. Experimental results show that the proposed algorithm can also decrease the complexity of the system.