The Design Of SSCS Based On 63-bit M-Sequence

SSC(Spread Spectrum Communication), as well as FOC(Fiber Optics Communication) and Satellite Communication, has been regarded as one of the three main high-tech communication modes since we entered a new era of information. In a Spread Spectrum Communication System, the transmit data was modulated at the transmission end with a pseudorandom sequence ,thus to spread the spectrum before transmission; and at the receive end, the data received was demodulated with the same pseudorandom sequence to recover the original information. As SSC system has many advantages, such as strong noise immunity, it has been widely used in various fields.M-sequence is a kind of pseudorandom sequence which was often used in SSCS . In this project, we modulate the transmit data by the 63-bit M-sequence pseudorandom code at the transmission end, and demodulate the modulated data with the same M-sequence pseudorandom code at the receiver. Through this method, we can filter out the noise which was added in the communication channel, so we can recover the original transmitted data.In the project which I completed, the four major parts of a SSC system with Verilog HDL: ECC (Error Control Coding), Adding noise, Modulation and Demodulation with the pseudorandom sequence were designed with Verilog. Synthesizable coding style was used during the design. Finally, I simulate the function of the design after the synthesis, and the error rate was tested, caculated and analyzed in detail.This project will be a design for a platform. The purpose of the project is to build a foundation platform, which include digital SSC system and EEC system. And the project provides the reference for the more complex design of the communication system.