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Computer network DS-SS (Direct sequence spread spectrum) question.

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How much is the interference rejection of the BPSK DS-SS if fb=10 Kbits/sec and fc=2 Mbits/sec? How much is the BER of this system if the practical BPSK modulation has 1db degradation from ideal performance?

a)Assume that 11 equal power independent DS-SS signal occupy the same RF BW and Eb/No=25 db are noise is required in such a high Eb/No system.

b)Assuming three independent equal power DS-SS signals and available  Eb/No=12 db.

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