Principles of Digital Data Transmission

Flashcards covering the key concepts of digital data transmission principles discussed in the lecture.

Digital Communication Systems

Systems that transmit digital data over a channel, primarily concerned with binary data (0s and 1s).

Line Coding

A technique to convert digital input into electrical pulses or waveforms.

PAM (Pulse Amplitude Modulation)

A signaling method where the amplitude of a pulse is varied to encode data.

Intersymbol Interference (ISI)

Interference that occurs when pulses overlap due to insufficient bandwidth or timing errors.

Nyquist Criterion for Zero-ISI

A principle that states pulses should have non-zero amplitude at their center and zero at other designated sampling points to avoid overlap.

Regenerative Repeater

A device that detects incoming signals and generates clean pulses to mitigate noise in a transmission line.

Multiplexer

A device used to combine multiple signals onto a single channel to efficiently use bandwidth.

Eye Diagram

A tool used to visualize and analyze the performance of a digital signal, indicating timing, noise, and intersymbol interference.

M-ary Signaling

A technique where multiple bits are transmitted by each symbol, increasing data rates.

Bipolar Signaling

A signaling method where three symbols are used: -1, 0, and +1, allowing better error detection.

Controlled ISI Signaling

A method that introduces some ISI yet enables reliable detection by understanding previous bits.

Fourier Transform

A mathematical transformation that converts a time-domain signal into its frequency-domain representation.

Error Detection and Correction

Techniques used to identify and correct errors in transmitted data.

Digital Carrier Systems

Systems that modulate digital signals onto a carrier wave for transmission over radio links.

Coherent PSK

A phase shift keying modulation technique that requires synchronization between transmitter and receiver.

Non-coherent Detection

A detection method that does not require phase synchronization, relying on amplitude characteristics.

Modem

A circuit that modulates and demodulates digital signals for communication over radio links.

Signal-to-Noise Ratio (SNR)

A measure used to quantify how much a signal has been corrupted by noise.

Frequency Shift Keying (FSK)

A modulation technique that transmits data by varying the frequency of a carrier wave.

Raised Cosine Filter

A filter shape used in digital communications that influences the pulse shape to reduce ISI.