Direct system allows detection of signals whose psd level is(a) Below noise level(b) Above noise level(c) All of the mentioned(d) None of the mentionedI got this question during an interview for a job.My query is from Stream Encryption and Commercial Applications in division Spread Spectrum Techniques of Digital Communications

Direct system allows detection of signals whose psd level is(a) Below

1.	Direct system allows detection of signals whose psd level is(a) Below noise level(b) Above noise level(c) All of the mentioned(d) None of the mentionedI got this question during an interview for a job.My query is from Stream Encryption and Commercial Applications in division Spread Spectrum Techniques of Digital Communications
Answer» The correct option is (a) Below NOISE level Explanation: Direct sequence SPREAD spectrum techniques ALLOW for the detection of signals WHOSE psd is below noise level.

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