CDMA secure coding and decoding method and system

Abstract

The invention provides a code division multiple access (CDMA) secure coding and decoding method and system, and the CDMA secure coding method comprises the steps: receiving a first clock signal, and converting the first clock signal into an analog signal; receiving a data signal and a second clock signal, and performing differential double-phase coding on the data signal to obtain a coded digital signal; conditioning and amplifying the analog signal, and coupling the analog signal with the coded digital signal to obtain a required baseband signal; coding the baseband signal to obtain a baseband coded signal; and performing CDMA coding on the baseband coding signal to obtain a CDMA coding signal. According to the CDMA safe coding and decoding method and system, interconnection and intercommunication of European railway operation control systems can be met, and the problems that an existing European train operation control system is poor in anti-interference performance, only suitable for short-distance transmission, high in bit error rate, high in receiving sensitivity threshold, free of multipath receiving and the like due to the fact that FSK, PSK and other signal systems are adopted are solved.

Description

technical field [0001] The invention belongs to the technical field of railway communication, and in particular relates to a CDMA safe encoding and decoding method and system. Background technique [0002] In order to adapt to the rapid development of China's high-speed railways and passenger dedicated lines and to ensure the safety of railway transportation, my country has successfully developed China's train control system, which is divided into application levels according to functional requirements and configurations. China's train control systems are divided into levels 0-4. [0003] With the increasing development of Chinese railways in the European railway market, it is gradually realized that the train operation control systems of European railways are complex and not fully compatible with each other. Therefore, it is necessary to develop a system that meets the interconnection of European railway operation control systems. Related signal transmission method and equi...

AI Technical Summary

Problems solved by technology

[0005] In order to meet the needs of the prior art, the present invention provides CDMA security encoding, decoding methods and systems, which can meet the interconnection and interoperability of European railway operation control systems, and solve the problem that existing European train operation control systems use FSK, PSK and other signal systems. Poor anti-interference performance, only suitable for short-distance transmission, high bit error rate, high reception sensitivity threshold, and lack of multi-path reception

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