How can I use AWGN Channel Block to specify a SNR respect my signal power?

Hello all,

I would like to use simulik AWG Channel Block to add certain Noise power to my signal. My desired signal is a 802.11p signal that I am creating with wlanNonHTConfig together with wlanWaveformGenerator as shown below

    cfgNHT = wlanNonHTConfig;
    cfgNHT.ChannelBandwidth = 'CBW10';
    cfgNHT.PSDULength = psduLen;
    cfgNHT.MCS = mcs;
    %% Packet parameters
    % Create random data; PSDULength is in bytes
    savedState = rng(0); % Set random state
    data = randi([0 1],cfgNHT.PSDULength*8*numPackets,1);
    % Generate a multi-packet waveform
    waveForm80211p = wlanWaveformGenerator(data,cfgNHT, 'NumPackets',numPackets,'IdleTime',idleTime);
    fs = wlanSampleRate(cfgNHT);
    disp(['Baseband sampling rate: ' num2str(fs/1e6) ' Msps, with sampling frequency ' num2str(fs/1e6) 'MSsamples/s']);
    

Signal s = waveForm80211p will be imported into Simulink ( as timeseries) and there I will add white gaussian noise using the block AWG Channel Block as depicted below

However, in order to make use of the block AWGN I need the parameter called Input signal power, referenced to 1 ohm (watts), but how can I get this parameter from my waveForm80211p?

I have tried to use the signalAnalyzer to get an estimation of the signal power, being that it is roughtly Power=~-37dB.

So I have applied this will give a value of Power=1.4125e-02, is this the value that I need to set in Input signal power, referenced to 1 ohm (watts) ? If not, can someone help me to get the right value to set there?

Thanks in advance,

regards