Simulation And Implementation Of Double Differential Spread Spectrum Communication

Spread-spectrum communication techniques are widely used in underwater acoustic com-munication system. Spread-spectrum signals can be hidden under noise, private and long-term transmitted. However, spread-spectrum systems usually are so complicated that must be realized in DSP or ARM devices which have higher performance than low-power devices.This paper presents a novel double-differential spread-spectrum system. The proposed system can be simple enough and forgoes the need of phase/Doppler tracking and correction or channel equalization. The double-differential spread-spectrum system takes advantage of spread-spectrum to increase the detection SNR and double-differential detection to make reliable symbol recovery possible without phase/Doppler tracking or channel equalization.This paper implements double-differential spread-spectrum receiving algorithms in MSP432 microcontroller . In order to fully decoupled driver and application, the paper de-signed a device driver model for MSP432. The device driver package the programe into the device layer and the driver layer. Applications can operate different devices by the same drive.At the same time, the paper uses memory pool technology to achieve fast dynamic memory management.Finally,the paper based on Qt/C++ to achieve a spread spectrum communication system of double-differential spread-spectrum cross-platform emitting end. Transmitting's front-end uses QML to develop, with good animation and interactive experience. It's background transmitting end use C++ to achieve double-differential encoding,PSK modulation and spreading algorithm.Through the system tests and experiments verified based MSP432 second order differen-tial spread spectrum system is achievable and effective. System relative to conventional direct sequence spread spectrum communication system having a Doppler shift resistant,low power consumption and simple structure.