Mehdi Blog on DSPRelated.com https://www.dsprelated.com/blogs-1/nf/Mehdi_.php Mehdi Blog on DSPRelated.com https://www.dsprelated.com/blogs-1/nf/Mehdi_.php https://d23s79tivgl8me.cloudfront.net/user/profilepictures/99432.jpg en-US Mon, 11 May 2026 15:56:32 +0000 1778514992 Analytic Signal https://www.dsprelated.com/showarticle/877.php In communication theory and modulation theory we always deal with two phases: In-phase (I) and Quadrature-phase (Q). The question that I will discuss in this blog is that why we use two phases and not more.

Any real band-limited signal along with its Hilbert transformed pair form an analytic signal. We normally use the analytic signal for modulation. A modulated signal is actually a...]]> Thu, 26 Nov 2015 05:40:32 +0000 Mehdi Maximum Likelihood Estimation https://www.dsprelated.com/showarticle/872.php Any observation has some degree of noise content that makes our observations uncertain. When we try to make conclusions based on noisy observations, we have to separate the dynamics of a signal from noise. This is the point that estimation starts. Any time that we analyse noisy observations to make decisions, we are estimating some parameters. Parameters...]]> Tue, 24 Nov 2015 23:53:40 +0000 Mehdi