Problem 3. Consider the direct-sequence CDMA system as de- scribed in Lecture 15. At the receiver suppose that instead of using the local code qi(t) we instead use q₁(t+A) where A is some ± fraction of a bit time, i.e., the local code may be shifted one direction or the other. Compute the degradation (in dB) to E₁/No due to a nonzero A at the output of the corre- lator for BPSK signaling. You may assume for the local code that adjacent chips are equally likely to match or differ.

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Problem 3.
Consider the direct-sequence CDMA system as de-
scribed in Lecture 15. At the receiver suppose that instead of using the local
code qi(t) we instead use q₁(t+A) where A is some ± fraction of a bit time,
i.e., the local code may be shifted one direction or the other. Compute the
degradation (in dB) to E₁/No due to a nonzero A at the output of the corre-
lator for BPSK signaling. You may assume for the local code that adjacent
chips are equally likely to match or differ.
Transcribed Image Text:Problem 3. Consider the direct-sequence CDMA system as de- scribed in Lecture 15. At the receiver suppose that instead of using the local code qi(t) we instead use q₁(t+A) where A is some ± fraction of a bit time, i.e., the local code may be shifted one direction or the other. Compute the degradation (in dB) to E₁/No due to a nonzero A at the output of the corre- lator for BPSK signaling. You may assume for the local code that adjacent chips are equally likely to match or differ.
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