1Representation of signalsSignals encountered in electronic communications are usually classified as: 1.Periodic or nonperiodic Periodic signal: its waveshape repeats after a duration or period T; i.e., )()(Ttgtg−=for all t. Examples:sinusoidal wave, repetitive pulse train, pseudo-random binary sequence. Nonperiodic signal: no repetition in waveshape. Examples: an isolated pulse, random signal. 2.Deterministic or random Deterministic signal: at any time (past, present or future), there is no uncertainty about its value. Examples: a specified sinusoidal wave, repetitive pulse train. Random signal: there is some degree of uncertainty about its value before it occurs. Examples: noise, speech, data.
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