Set the crest factor and put 12.88 dB as a default value, which will display the peak-to-average ratio of the AWGN.in matlab
时间: 2024-04-17 15:24:56 浏览: 19
To set the crest factor and use 12.88 dB as the default value to calculate and display the peak-to-average ratio of AWGN in MATLAB, you can modify the previous code as follows:
```matlab
% Set parameters
N = 1000; % Length of the generated signal
SNR_dB = 12.88; % Default signal-to-noise ratio in dB
% Set crest factor in dB
crest_factor_dB = 12.88; % Crest factor in dB
% Generate original signal
x = randn(1, N); % Generate Gaussian random numbers with zero mean and unit variance
% Compute noise variance corresponding to the given SNR
SNR = 10^(SNR_dB / 10);
sigma = sqrt(var(x) / SNR);
% Generate noise
n = sigma * randn(1, N); % Generate Gaussian random numbers with zero mean and variance sigma^2
% Add noise to the original signal
y = x + n;
% Compute peak and average values
peak = max(abs(y)); % Compute peak value
average = mean(abs(y)); % Compute average value
% Calculate peak-to-average ratio (PAR) in dB
PAR_dB = 10 * log10(peak^2 / average^2);
% Display results
fprintf('Peak: %f\n', peak);
fprintf('Average: %f\n', average);
fprintf('Peak-to-Average Ratio (PAR): %.2f dB\n', PAR_dB);
```
In this code, after setting the crest factor in dB, we calculate the peak-to-average ratio (PAR) of the AWGN by taking the logarithm of the ratio of the squared peak value to the squared average value. The result is then displayed using `fprintf`.