add white gaussian noise

I tried to add noise to a signal. The signal noise ratio must be 0 dB. I tried with

   signal_noise=awgn(signal,0,'measured')

Is there any method?

Answer 1

[OCDER]

signal_noise=awgn(signal,1,'measured')

SNR = 1 means 0 dB.

[Jessie Bessel]

Ok.Any method, without awgn?

[OCDER]

noise = sig * randn(size(signal)); %sig is your standard dev.
signa_noise = signal + noise       %you have to determine value of "sig". 
                                   %sig = std(signal)  ?