What is Modulation? | Teleinf Edu
The core concept of impressing information onto a high-frequency carrier wave.
2 min
Modulation
Carrier modulation concepts and signal representation methods used in modern telecom systems.
Articles: 21
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Amplitude Modulation (AM) | Teleinf Edu
Varying the amplitude of the carrier wave. Exploring DSB-WC, DSB-SC, and SSB.
2 min
Frequency Modulation (FM) | Teleinf Edu
Varying the frequency of the carrier. Concepts of deviation and modulation index.
2 min
Phase Modulation (PM) | Teleinf Edu
Varying the phase of the carrier wave and its relationship with FM.
2 min
Amplitude-Shift Keying (ASK) | Teleinf Edu
Digital modulation by switching between discrete amplitude levels.
2 min
Frequency-Shift Keying (FSK) | Teleinf Edu
Digital modulation by switching between discrete frequency levels.
2 min
Phase-Shift Keying (PSK) | Teleinf Edu
The general principle of digital modulation by shifting the phase of the carrier.
2 min
Constellation Diagrams | Teleinf Edu
Visualizing digital modulation schemes in the I-Q plane.
2 min
Binary Phase-Shift Keying (BPSK) | Teleinf Edu
The simplest form of PSK, using two phases to encode 1 bit per symbol.
2 min
Quadrature Phase-Shift Keying (QPSK) | Teleinf Edu
Using four phases to encode 2 bits per symbol, doubling the data rate of BPSK.
2 min
Offset QPSK (OQPSK) | Teleinf Edu
A variant of QPSK that reduces amplitude fluctuations, ideal for non-linear channels.
2 min
Differential PSK (DPSK) | Teleinf Edu
Encoding information in the phase difference between symbols to simplify receivers.
2 min
Dual-Polarization QPSK (DP-QPSK) | Teleinf Edu
Doubling spectral efficiency by transmitting two independent QPSK signals on orthogonal polarizations.
2 min
M-ary Phase-Shift Keying (M-PSK) | Teleinf Edu
Generalizing PSK to M phases to encode log2(M) bits per symbol.
2 min
MSK and GMSK | Teleinf Edu
Advanced, spectrally efficient FSK schemes like Minimum Shift Keying.
2 min
Quadrature Amplitude Modulation (QAM) | Teleinf Edu
Combining ASK and PSK for high spectral efficiency (16-QAM, 64-QAM).
2 min
Pulse Amplitude Modulation (PAM) | Teleinf Edu
Modulating the amplitude of a pulse train, a key step in sampling.
2 min
Pulse Width Modulation (PWM) | Teleinf Edu
Encoding information in the duration (width) of pulses.
2 min
Pulse Position Modulation (PPM) | Teleinf Edu
Encoding information in the time position of pulses.
2 min
Pulse Density Modulation (PDM) | Teleinf Edu
Representing an analog signal's amplitude via the density of pulses.
2 min
Transmission Speed Dependence on Modulation | Teleinf Edu
Analysis of R_b = R_s * m relationship and impact of modulation complexity on spectral efficiency.
2 min