Question

Data at rate of R₂ bps is initially transmitted over a channel using rect(-) NRZ binary signaling.To reduce channel bandwidth (but maintain bit rate), it is decided to use 4-ary multi-amplitude signaling with the same pulse shape. By what factor is the bandwidth reduced? Explain b. By what factor is the transmitted power increased or decreased? Assume rectangular pulses of amplitude 3V, 1V, -1V, -3V are used for the 4-ary system to encode the possible words/patterns, and the original binary system used 1V and -1V rectangular pulses.Furthermore, assume that all pulse amplitudes occur with equal probability in a transmission (this assumption will facilitate on how to determine the period of the waveforms to calculate power).

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