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I am trying to understand the DSSS (spread spectrum) performance improvments.

Let's consider that we are in BPSK and on a AWGN channel without any interferences or adjacent signals.

Is the theoretical BER for a given Eb/N0 the same using or not DSSS? Does the DSSS improve the sensitivity level of a receiver?

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    $\begingroup$ The answer to the first question is "The same". For the second question, you need to tell us what you understand by the sensitivity level of the receiver. $\endgroup$
    – Dilip Sarwate
    Commented Nov 27, 2022 at 16:29
  • $\begingroup$ If the BER starts to be null at a given dBm level without DSSS can I expect to go lower with it? $\endgroup$
    – dsp_curious
    Commented Nov 27, 2022 at 16:46
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    $\begingroup$ There is no dBm level at which the BER is $0$. At large SNR, the BER can be very small, but it never can be $0$. The presence or absence of DSSS makes no difference to this fact. The theoretical BER for a given $E_b/N_0$ ratio is the same whether you are using plain BPSK or BPSK with DSSS modulation. What DSSS changes is the bandwidth of the transmitted signal, and hence lowers the carrier-to-noise ratio. See also this answer. $\endgroup$
    – Dilip Sarwate
    Commented Nov 27, 2022 at 21:06
  • $\begingroup$ You answered my question, thanks $\endgroup$
    – dsp_curious
    Commented Nov 28, 2022 at 11:12

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