油井下声传输系统中卷积编码的Matlab仿真

Matlab simulation of convolutional encoding in acoustic logging transmission system

为了实现钻井过程中井下信息的实时测量和上传,采用声波作为载波是一种很有发展前景的方法。对随钻数据声波传输系统中的调制技术和编码解码方法进行了Matlab仿真,结果表明:采用QPSK调制技术和1/3编码效率的卷积编码能提高数据通信的可靠性,降低系统的误码率。

The acoustic wave data transmission is a promising method to realize real-time measurement and uploading of the downhole information in the process of drilling. The modulation technology and coding/decoding method of the LWD data sound wave transmitting system were simulated in Matlab. The results show that the convolutional encoding with QPSK modula-tion technology and 1/3 coding efficiency can improve the reliability of the data communications and lower the bit error rate of the system.