Direct Sequence Spread Spectrum Dmf Capture Technology Simulation Design

Direct sequence spread spectrum is an effective anti-jamming communications technology, to improve signal reception quality, confidentiality and increase system capacity have outstanding advantages. In the direct spread spectrum system, has a good self-related and inter-related characteristics of the pseudo-random code on the system plays an important role in the performance. Pseudo noise code acquisition is a key link of direct spread spectrum communication system. In order to spreading code tracking and demodulator, the acquisition of the Pseudo noise code must perform first. Digital matched filter is one of the Pseudo noise code capture technology, has many advantages, such as high speed of acquisition and accuracy, controlling simple, easy to realize .It is a common acquisition technology.According to pseudo noise code and digital filter match of the theoretical knowledge, the self-related and inter-related characteristics of the m sequence and Gold code sequence perform corresponding simulation in Matlab software. At the same time, the ability of acquisition of the Digital matched filter perform corresponding simulation in Matlab software in different signal to noise ratioAlso, under the theoretical of direct spread spectrum, a digital spread spectrum receiver designed with the core of the Digital matched filter, the components of the entire system are achieved the diagram and their corresponding Waveform of simulation. The system is downloaded to the hardware and complete corresponding test.The system simulation, FPGA design and hardware implementation indicate that the matched filter in the spread spectrum communication system is feasible to achieve expansion of the spread spectrum signals.