3 problems

Consider a two-user Gaussian multiple-access channel (GMAC) with $M$-PAM, $M$-PSK, and $M$-QAM alphabet pairs, where the relative rotation for the PAM pair is…

Let $M$ be a positive integer. An $M$-PAM signal-set pair with relative rotation $\frac{\pi}{2}$ is compared with $M$-PSK and $M$-QAM signal-set pairs using appropriate rotations a…

Let $M$-PAM denote the one-dimensional pulse-amplitude modulation constellation with $M$ points, and let a multidimensional signal set be obtained using a generator matrix…