We use M-Ary encoding to represent 3 bits per symbol. Each symbol is a voltage level. Sketch this modulation scheme. Determine the signal power if logic 0 and logic 1 are equally likely. In the absence of noise, what is the maximum capacity of the communications channel? If there is noise and the noise Power Spectral Density (PSD) looks like that shown in Figure 1c), determine Eb/N0. Explain how we use a better representation of binary bits allocated to each level to ensure we minimise the BER. No Noise density 0 Total noise power = 1W f, Hz B=1kHz Figure 1c)

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