10.6-13 A five-signal configuration in a two-dimensional space is shown in Fig. P10.6-13. (a) Choose the 1 (!)=√2/To cos wet and 42(t)=√√2/To sin wet and sketch the waveforms of the five signals. Figure P.10.6-13 (b) In the signal space, sketch the optimum decision regions, assuming an AWGN channel. (e) Determine the error probability PeM as a function of E of the optimum receiver. 312 • . d +42 •