In a DS/BPSK system, the feedback shift register used to

In a DS/BPSK system, the feedback shift register used to generate the PN sequence has length m = 19. The system is required to have an average probability of symbol error due to externally generated interfering signals that does not exceed 10 – 5. Calculate the following system parameters in decibel:
(a) Processing gain.
(b) Antijam marg