phase_estimation.m

some of the important matlab codes for calculating PSD of a signal for students

function phihat = phase_estimation(r, b_train)
% phihat = phase_estimation(r, b_train)
%
% Phase estimator using the training sequence. The phase estimate is
% obtained by minimizing the norm of the difference between the known
% transmitted QPSK-modulated training sequence and the received training
% part. NB! There are other ways of estimating the phase, this is just
% one example.
%
% Input:
%   r       = received baseband signal
%   b_train = the training sequence bits
%
% Output:
%   phihat     = estimated phase