5.1 Geometric rep.of the sig waveforms 2.Now think of an signal waveform as a vector (or element)in a space. The space is called signal space. s() S1(t) S2(t) Questions: Are the basis signals orthonormal? For new pulses,what are s1(t),s2(t)and s(t)? For sin2fr and cos2f,what are the signals? UESTC-Digital transmission through the AWGN channel Prof李晓峰 10