What is the maximum data rate a wireless link can support using BPSK for given BER and SNR?
In BPSK, BER is equal to $Q(\sqrt{2E_b/N_0})$, so you need $E_b/N_0&gt;11.3$ to have a BER no larger than $10^{-6}$. Since the bandwidth is 200 kHz, the maximum rate is 400 kb/s. So, since $SNR\approx136$,

$$\frac{Eb}{N_0}=\frac{S}{N}\frac{W}{R}=136\frac{200\cdot10^3}{400\cdot10^3}=\frac{136}{2}=68$$

Since $68&gt;11.3$, you can be sure that you can transmit at 400 kb/s and meet your BER requirement.

Note that I'm assuming baseband transmission (so that the bit rate is twice the bandwidth). Note also that the question, as posed, does not make a lot of sense, since the bandwidth will essentially determine your bit rate.