DIGTAL MODULATION TECHNIQUES
Bipin Kumar
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Abstract
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In the realm of communication systems, there is a notable shift from analogue techniques to digital techniques, particularly in voice and video transmission. Digital modulation techniques such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK), along with combinations like Quadrature Amplitude Modulation (QAM), are presented as efficient means to encode digital data onto carrier signals. These technologies result in effective bandwidth utilization and enhanced error correction capabilities, ultimately leading to improved communication quality and efficiency.
Key takeaways
- The three techniques are referred to as amplitude shift keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK).
- Here 2 (for Binary FSK) different carrier frequencies are used and they are switched according to input bit stream.
- A synchronous FSK signal which has a shift in Hertz equal to an exact integral multiple (n = 1, 2,...) of the keying rate in bauds, is the most common form of coherent FSK.
- The FM detector demodulator treats the FSK signal as a simple FM signal with binary modulation.
- The classic "matched" filter demodulator is optimal for coherent FSK in white gaussian noise interference.
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