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# Will DSSS improve the BER performance ?

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#### fanshuo

##### Full Member level 5
Will DSSS improve the BER performance ?

Or will a system achieve the same BER with less required SNR compared toa system without DSSS?

I think it will not.

#### m_llaa

##### Full Member level 4
DSSS and BER

Hi
It doesnt have any improving in SNR, but it spreads the transmitted power in wide frequency band, so this is acceptable for secure communication.

#### fanshuo

##### Full Member level 5
DSSS and BER

So if somebody say :
from BER requirement the SNR requirement can be calculated
but considering the DSSS conversion gain, the actual minimum SNRmin=SNR-process gain.

It is absolutely wrong!

#### m_llaa

##### Full Member level 4
DSSS and BER

Hi
You are rigth, for BER requirement, the SNR after processing gain is considered.
But for example the BER in BPSK-DSSS after processing is equal to BER in BPSK system with the same SNR.

Points: 2