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#### Sherrie Laraurens

- Jan 1, 1970

- 0

I'm trying to write a simple BPSK through an AWGN channel.

I'm currently taking a file of binary data and going 1 bit

at a time through it and doing the following:

if the bit is 1 equate the bpsk form to +1/sqrt(2)

if the bit is 0 equate the bpsk form to -1/sqrt(2)

So far so go, now I want to simulate an AWGN channel, with

the hopes of calculate a BER from between what went into

the AWGN channel and what came out.

I've setup a Gaussian / normal distribution random number

generator, with mean of 0.0, but I've having difficulty

calculating the variance. I'm simulating this only using

Eb/No or SNR in dB form.

Is the formula for variance like so:

sigma = sqrt(1.0 / 2.0 * 10 ^ ((Eb/_No) / 10.0));

or

sigma = sqrt(1.0 / 2.0 * 10 ^ (SNR / 10.0));

all help and comments will be appreciated very much.

-Sherrie