Linear Modulation and Demodulation

Innovative Technologies in Education (ITE)

The linear modulation & demodulation module will cover linear modulation techniques currently used in modern analog and digital communications systems. An analog or digital information signal will be conveyed on to a carrier signal whose instantaneous amplitude varies according to the variation of the original information signal.

Specifically, Double-Sideband modulation (DSB), conventional Amplitude Modulation (AM), Single-Sideband Modulation (SSB) and Quadrature and Amplitude modulation (QAM) should be studied.

RECOMMENDED EXPERIMENTS

1. Frequency translation - Demonstration of frequency translation and resulting spectrum - Frequency division multiplexing (FDM) 2. Double Sideband Suppressed Carrier (DSB-SC) Modulation 3. Amplitude Modulation 4. Single Side Band (SSB) Modulation 5. Quadrature Amplitude Modulation (QAM) 6. Synchronous Demodulation 7. Correlation Receiver 8. Envelope Detector

TECHNICAL SPECIFICATIONS

The linear modulation & demodulation Training System should consist of the following main blocks:

- Balanced Modulator - Am Modulator - SSB Filter - Phase-Shift SSB Modulator/QAM Modulator - Mixer - Integrate & Dump - Envelope Detector - Phase Shifter - Differential Encoder/Decoder