Abstract:

A method to evade narrow-band interference in direct sequence spread spectrum (DSSS) communication is introduced by using the frequency-hopping characteristic of different m-Walsh composite sequences. The proposed method possesses the DSSS signals of controllable frequency spectrum by changing the period of m and Walsh seguences and the sequence number of the Walsh function, thus making the frequency band where narrow band interference lies be less signal energy and reducing
the influence of interference on signals. Simulation results show that the bit error rate of the avoidance method can raise 1 to 2 order of magnitude compared with DSSS for combatting against single frequency interference and narrow band interference.