Research of Narrow-Band Interference Suppression Technologies in DSSS Communication Systems

In reality, there is a problem in the application of narrow-band interference suppression technologies in the DSSS communication system. It is the error of estimating IF (interference frequency) which would inference the performance of narrow-band interference suppression algorithms. In this article, we at first construct the second-order multiple poles AR narrowband interference signal mode with frequency difference. Then, in the mode of AR interference signal, we analyze and simulate the change of DSSS communication system crosscorrelation values with FIR linear transversal prediction filter and FIR linear transversal interpolation filter. Both analysis results and numerical simulation results show that FIR linear transversal interpolation filter suppresses the narrow-band interference better than FIR linear transversal prediction filter under the same interference power, the same taps, and the same frequency difference.