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88 relations: Additive white Gaussian noise, AM stereo, Amplitude, Amplitude and phase-shift keying, Amplitude modulation, Amplitude-shift keying, Analog signal, Asymmetric digital subscriber line, Binary number, Bit, Bit error rate, Bitstream, Broadcasting, C-QUAM, Cable modem, Carrier wave, Carrier-to-noise ratio, Carrierless amplitude phase modulation, Center frequency, Color television, Colorburst, Constellation diagram, Coordinate system, Crosstalk, Data, Decibel, Demodulation, Digital cable, Digital terrestrial television, Double-sideband suppressed-carrier transmission, Error function, Ethernet over coax, Euclidean distance, Freeview (UK), Frequency domain, Frequency modulation, Frequency-shift keying, G.hn, Gray code, Herley Industries, Hertz, Hierarchical modulation, IEEE 802.11, In-phase and quadrature components, Interferometry, ITU-T, Link adaptation, Low-pass filter, Microwave, Modulation, ..., Multipath interference, Mutual information, Noise, Noise (electronics), NTSC, Numerical integration, Orthogonality, PAL, Phase (waves), Phase modulation, Phase-locked loop, Phase-shift keying, Pilot signal, Power-line communication, Probability, Probability density function, Product detector, Pulse-amplitude modulation, QAM (television), Quantization (signal processing), Radio frequency, Random modulation, Sampling (signal processing), Shannon–Hartley theorem, Signal-to-noise ratio, Sine, Sine wave, Single-sideband modulation, Society of Cable Telecommunications Engineers, Spectral density, Spectral efficiency, Subcarrier, Symbol rate, Telecommunication, Telephone line, Trigonometric functions, Watt, XPIC. Expand index (38 more) »
Additive white Gaussian noise
Additive white Gaussian noise (AWGN) is a basic noise model used in Information theory to mimic the effect of many random processes that occur in nature.
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AM stereo
AM stereo is a term given to a series of mutually incompatible techniques for radio broadcasting stereo audio in the AM band in a manner that is compatible with standard AM receivers.
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Amplitude
The amplitude of a periodic variable is a measure of its change over a single period (such as time or spatial period).
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Amplitude and phase-shift keying
Amplitude and phase-shift keying or asymmetric phase-shift keying (APSK), is a digital modulation scheme that conveys data by changing, or modulating, both the amplitude and the phase of a reference signal (the carrier wave).
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Amplitude modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave.
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Amplitude-shift keying
Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave.
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Analog signal
An analog signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.
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Asymmetric digital subscriber line
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide.
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Binary number
In mathematics and digital electronics, a binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically 0 (zero) and 1 (one).
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Bit
The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.
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Bit error rate
In digital transmission, the number of bit errors is the number of received bits of a data stream over a communication channel that have been altered due to noise, interference, distortion or bit synchronization errors.
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Bitstream
A bitstream (or bit stream), also known as binary sequence, is a sequence of bits.
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Broadcasting
Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model.
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C-QUAM
C-QUAM is the method of AM stereo broadcasting used in Canada, the United States and most other countries.
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Cable modem
A cable modem is a type of network bridge that provides bi-directional data communication via radio frequency channels on a hybrid fibre-coaxial (HFC) and radio frequency over glass (RFoG) infrastructure.
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Carrier wave
In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information.
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Carrier-to-noise ratio
In telecommunications, the carrier-to-noise ratio, often written CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal.
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Carrierless amplitude phase modulation
Carrierless amplitude phase modulation (CAP) is a variant of quadrature amplitude modulation (QAM).
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Center frequency
In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies.
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Color television
Color/Colour television is a television transmission technology that includes information on the color of the picture, so the video image can be displayed in color on the television set.
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Colorburst
Colorburst is an analog video, composite video signal generated by a video-signal generator used to keep the chrominance subcarrier synchronized in a color television signal.
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Constellation diagram
A constellation diagram is a representation of a signal modulated by a digital modulation scheme such as quadrature amplitude modulation or phase-shift keying.
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Coordinate system
In geometry, a coordinate system is a system which uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space.
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Crosstalk
In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.
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Data
Data is a set of values of qualitative or quantitative variables.
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Decibel
The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.
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Demodulation
Demodulation is extracting the original information-bearing signal from a carrier wave.
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Digital cable
Digital cable is any type of cable television distribution using digital video compression for distribution.
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Digital terrestrial television
Digital terrestrial television (DTTV or DTT) is a technology for broadcast television in which land-based (terrestrial) television stations broadcast television content by radio waves to televisions in consumers' residences in a digital format.
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Double-sideband suppressed-carrier transmission
Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed.
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Error function
In mathematics, the error function (also called the Gauss error function) is a special function (non-elementary) of sigmoid shape that occurs in probability, statistics, and partial differential equations describing diffusion.
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Ethernet over coax
Ethernet over Coax (EoC) is a family of technologies that supports the transmission of Ethernet frames over coaxial cable.
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Euclidean distance
In mathematics, the Euclidean distance or Euclidean metric is the "ordinary" straight-line distance between two points in Euclidean space.
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Freeview (UK)
Freeview is the United Kingdom's digital terrestrial television platform.
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Frequency domain
In electronics, control systems engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency, rather than time.
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Frequency modulation
In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.
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Frequency-shift keying
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
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G.hn
G.hn is a specification for home networking with data rates up to 2 Gbit/s and operation over four types of legacy wires: telephone wiring, coaxial cables, power lines and plastic optical fiber.
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Gray code
The reflected binary code (RBC), also known just as reflected binary (RB) or Gray code after Frank Gray, is an ordering of the binary numeral system such that two successive values differ in only one bit (binary digit).
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Herley Industries
Herley Industries, based in Lancaster, Pennsylvania, is an American company that specializes in supplying microwave and millimeter wave products to defense and aerospace industries.
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Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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Hierarchical modulation
Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission.
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IEEE 802.11
IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in the 900 MHz and 2.4, 3.6, 5, and 60 GHz frequency bands.
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In-phase and quadrature components
In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (/2 radians).
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Interferometry
Interferometry is a family of techniques in which waves, usually electromagnetic waves, are superimposed causing the phenomenon of interference in order to extract information.
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ITU-T
The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.
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Link adaptation
Link adaptation, or adaptive coding and modulation (ACM), is a term used in wireless communications to denote the matching of the modulation, coding and other signal and protocol parameters to the conditions on the radio link (e.g. the pathloss, the interference due to signals coming from other transmitters, the sensitivity of the receiver, the available transmitter power margin, etc.). For example, WiMAX uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission.
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Low-pass filter
A low-pass filter (LPF) is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency.
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Microwave
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.
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Modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
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Multipath interference
Multipath interference is a phenomenon in the physics of waves whereby a wave from a source travels to a detector via two or more paths and, under the right condition, the two (or more) components of the wave interfere.
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Mutual information
In probability theory and information theory, the mutual information (MI) of two random variables is a measure of the mutual dependence between the two variables.
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Noise
Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing.
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Noise (electronics)
In electronics, noise is an unwanted disturbance in an electrical signal.
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NTSC
NTSC, named after the National Television System Committee,National Television System Committee (1951–1953),, 17 v. illus., diagrs., tables.
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Numerical integration
In numerical analysis, numerical integration constitutes a broad family of algorithms for calculating the numerical value of a definite integral, and by extension, the term is also sometimes used to describe the numerical solution of differential equations.
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Orthogonality
In mathematics, orthogonality is the generalization of the notion of perpendicularity to the linear algebra of bilinear forms.
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PAL
Phase Alternating Line (PAL) is a color encoding system for analogue television used in broadcast television systems in most countries broadcasting at 625-line / 50 field (25 frame) per second (576i).
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Phase (waves)
Phase is the position of a point in time (an instant) on a waveform cycle.
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Phase modulation
Phase modulation (PM) is a modulation pattern for conditioning communication signals for transmission.
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Phase-locked loop
A phase-locked loop or phase lock loop abbreviated as PLL is a control system that generates an output signal whose phase is related to the phase of an input signal.
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Phase-shift keying
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave).
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Pilot signal
In telecommunications, a pilot signal is a signal, usually a single frequency, transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, or reference purposes.
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Power-line communication
Power-line communication (PLC) carries data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers.
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Probability
Probability is the measure of the likelihood that an event will occur.
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Probability density function
In probability theory, a probability density function (PDF), or density of a continuous random variable, is a function, whose value at any given sample (or point) in the sample space (the set of possible values taken by the random variable) can be interpreted as providing a relative likelihood that the value of the random variable would equal that sample.
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Product detector
A product detector is a type of demodulator used for AM and SSB signals.
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Pulse-amplitude modulation
Pulse-amplitude modulation (PAM), is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulse.
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QAM (television)
QAM is a digital television standard using quadrature amplitude modulation.
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Quantization (signal processing)
Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set.
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Radio frequency
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
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Random modulation
In the theories of modulation and of stochastic processes, random modulation is the creation of a new signal from two other signals by the process of quadrature amplitude modulation.
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Sampling (signal processing)
In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal.
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Shannon–Hartley theorem
In information theory, the Shannon–Hartley theorem tells the maximum rate at which information can be transmitted over a communications channel of a specified bandwidth in the presence of noise.
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Signal-to-noise ratio
Signal-to-noise ratio (abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.
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Sine
In mathematics, the sine is a trigonometric function of an angle.
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Sine wave
A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.
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Single-sideband modulation
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation, used to transmit information, such as an audio signal, by radio waves.
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Society of Cable Telecommunications Engineers
The Society of Cable Telecommunications Engineers or SCTE is a non-profit professional association for the advancement of technology, standards and workforce education related to cable telecommunications engineering.
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Spectral density
The power spectrum S_(f) of a time series x(t) describes the distribution of power into frequency components composing that signal.
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Spectral efficiency
Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system.
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Subcarrier
A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information.
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Symbol rate
In digital communications, symbol rate, also known as baud rate and modulation rate, is the number of symbol changes, waveform changes, or signaling events, across the transmission medium per time unit using a digitally modulated signal or a line code.
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Telecommunication
Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.
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Telephone line
A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communication system.
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Trigonometric functions
In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are functions of an angle.
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Watt
The watt (symbol: W) is a unit of power.
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XPIC
XPIC, or cross-polarization interference cancelling technology, is an algorithm to suppress mutual interference between two received streams in a Polarization-division multiplexing communication system.
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Redirects here:
1024-QAM, 1024QAM, 128-QAM, 128QAM, 16-QAM, 16QAM, 2-QAM, 2048-QAM, 2048QAM, 256-QAM, 256QAM, 2QAM, 32-QAM, 32QAM, 4-QAM, 4096-QAM, 4096QAM, 4QAM, 512-QAM, 512QAM, 64-QAM, 64QAM, 8-QAM, 8QAM, IQ Modulation, QAM, QAM-modulated, Qam, Quadrature Amplitude Modulation.
References
[1] https://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
