Communication Systems for Electrical Engineers by Mohammad A. Matin

Author:Mohammad A. Matin
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

2.Power efficiency

3.Error detection and correction capability

4.Favourable power spectral density

5.Adequate timing content

6.Transparency.

4.5.1 Binary Modulated Bandpass Signaling

Thus far, we have discussed baseband digital systems, where signals are transmitted directly without shift in the frequencies of the signal. It is also realized that bandpass digital communication signals are produced by using baseband digital signals to modulate a carrier. Two basic forms of modulation exist: amplitude modulation and angle modulation . In amplitude modulation, the carrier amplitude is varied in proportion to the modulating signal (i.e., the baseband signal) whereas in angle modulation, the carrier frequency or phase of the carrier is varied according to the modulating signal. The amplitude modulation scheme of transmitting binary data is known as on-off keying (OOK) or amplitude shift keying (ASK) (Fig. 4.17).

Fig. 4.17 a OOK, b PSK and c FSK signal

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