Deleted

03 P1765 Baseline EVM Algorithms/Single_Carrier/F_freqSqrtRaisedCosine.m

-function Hrrc = F_freqSqrtRaisedCosine(Tsym, alpha, deltaT, N)
-
-    % This function generates the frequency response of a root raised cosine
-    % filter using the definition in the following reference:
-    % M. Joost, "Theory of Root-Raised Cosine Filter," published online at
-    % www.michael-joost.de/rrcfilter.pdf
-    % See Section 5.2.1 of IEEE P1765 document: Filter the Baseband Signals
-
-    % INPUTS:
-    % Tsym:     Symbol duration in ns, inverse of symbol rate
-    % alpha:    Root raised cosine filter rolloff
-    % deltaT:   Point spacing in ns, inverse of sample rate
-    % N:        Total number of points
-    
-    % OUTPUTS:
-    % Hrrc:     Transfer function of the root-raised cosine filter
-
-    % The Hrrc is defined in three frequency ranges
-    % At lower frequencies,         f < f1,         constant spectrum
-    % For frequencies,              f1 > f > f2,    root raised cosine function
-    % At higher frequencies,        f > f2,         zero
-    % Calculate the frequencies f1 and f2:
-    f2 = ((1.0 + alpha) / 2.0) / double(Tsym);      % Maximum filter frequency
-    f1 = ((1.0 - alpha) / 2.0) / double(Tsym);      % Start of rolloff
-    deltaF = 1.0 / (double(N) * deltaT);            % Frequency spacing
-    ns = floor(f2 / deltaF);                        % Set of frequencies in the passband of the filter
-    Ntotal = 1 + 2 * ns;
-    Hrrc = complex(zeros(Ntotal,1));
-    B = sqrt(Tsym);
-
-    % Create the filter values
-    k = 0;
-    for kFreq = -ns:ns
-        Freq = double(kFreq) * deltaF;
-        k = k + 1;
-        if abs(Freq) <= f1
-            Hrrc(k) = B;
-        elseif abs(Freq) <= f2
-            Hrrc(k) = (B / sqrt(2.0)) * sqrt(1.0 + cos(pi * (Tsym/alpha) * ((abs(Freq) - f1))));
-        end 
-    end
-end 
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