Design and Implementation of Direct Sequence Spread Spectrum System Using Combinatorial Linear Search Method with Residence of Variable and Parallel by FPGA

摘要

Due to the rapid growth of telecommunications systems and the increasing demand for radio-frequency spectrum, spread spectrum technique that makes optimal use of the frequency spectrum is important. Proper performance of these systems against unintentional and intentional interferences, low probability of eavesdropping and many other benefits have been caused the ubiquitous of these systems in martial and commercial areas. This increasing expansion on the one hand and the possibility to implement reconfigurable hardware with small dimensions and high-speed on the other hand causes simulation and implementation of the sender and messages acquisition section in receiver of Direct Sequence Spread Spectrum (DSSS) using FPGA chip, be considered in this article. The results of this implementation, the processing profit 27.408dB, PN clock frequency is equal to 35.24 meg, power consumption is 90.231 mw and code length is 264-1 which is comparable with all designed digital direct sequence spread spectrum system systems. Combinatorial linear search method with integration variable and parallel search is used to implement the acquisition section.