| Long Zizhuang (Signal and Information Processing)Directed by Prof. Li ShengpeiTechnique of transmitting data via power line (PL), a new technique developed in the recent years, is used to automatize the fee collecting system in pubic service and the management of uptown service. And the most popular technique in this field is spread spectrum carrier (SSC) communication. In this paper, after introducing the principle of SSC , design of hardware and software of the system are been discussed. Of the hardware, the collector and sampler are dissertated at detail, which communicate by power line Modem, while in the part of software, the management system with the Access database as the kernel.After that, the paper dissertates with the security of the data transmission in the remote fee collecting system via power line. A project is put forth to solve the security problem, which is ordering the data transmitted by random number, using Hash function to operate on the data and using one time encryption to cipher the Hash value and random number. This conclusion is also effective to other public utilities charging system via remote transmitting technique.This system has been put into test, the result has proved its high stability and reliability. |
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