Question: The signal space for a seven-signal set transmitted over an additive white Gaussian noise (AWGN) channel with equal prior probabilities is shown in Fig.
![1813_4.4.png](https://secure.tutorsglobe.com/CMSImages/1813_4.4.png)
(a) Determine the optimum decision regions if the criterion used is minimum probability of error.
(b) Find the probability of error.