Research on Balise Message Coding Based on Extended Window Unequal Protection Optimization

With the continuous improvement of railway operating speed, the efficient and secure transmission of balise message is a key problem in the present study. The decoding process of balise message has nothing to do with the secondary sequence of coding symbol reaching decoding end . This paper uses an optimized degree distribution fountain code to realize unequal error protection of data. Data with different levels of importance are protected by different mechanisms. Window W1 where MIB is stored adopts truncated degree distribution and window W2 LIB uses RSD degree distribution. Matlab simulation is used to obtain the decoding failure size under different code lengths. Simulation results show that: Using the unequal error protection of optimization degree distribution can ensure that the high priority data can be better protected. The theoretical feasibility of this method is verified.