What is meant by carrier signal

Tag overview for Modulation techniques

3D MIMO technology
3D MIMO
MIMO (Multiple Input Multiple Output) is a multiple antenna technology that works with several transmitting and receiving antennas and thereby increases the received field strength. To further increase the reception ... read on
adaptive delta modulation: ADM
Adaptive delta modulation
Adaptive delta modulation (ADM) is a digital modulation method based on the comparator principle. The difference between the analog signal and an estimated comparison signal is passed on to the compar ... read on
adaptive delta pulse code modulation: ADPCM
Adaptive delta pulse code modulation
The ADPCM method (Adaptive Delta Pulse Code Modulation) is a pulse code modulation with a prediction mechanism. This prediction tries to determine the possible signal shape and forms it ... read more
amplitude modulation: AM
Amplitude modulation
Amplitude modulation (AM) is a modulation method in which the information signal is modulated to the amplitude of a carrier frequency. The amplitude of the carrier frequency changes in ... read on
asymmetric phase shift keying: APSK
The APSK modulation (Asymmetric Phase Shift Keying) belongs to the multi-value phase shift keying in which the bit groups are represented by different phase angles and different amplitudes ... read more
additive white gaussian noise: AWGN
Additive White Gaussian Noise (AWGN) is white noise that is distributed over the channel bandwidth according to the Gaussian distribution curve and constant spectral noise power. The AWGN-Ra ... read on
binary offset carrier modulation: BOC
BOC modulation
In satellite navigation, the navigation data is transmitted from the satellite using Binary Offset CarrierModulation (BOC) or Binary Phase Shift Keying (BPSK). The BOC modulation works ... read on
carrier to interference ratio: C / I
The ratio of carrier signal to interference signal (C / I) is the distance between the useful signal and self-interference. The self-interference is caused by reflections on buildings and mountains and ... read on
coherent differential phase shift keying: CDPSK
Coherent Differential Phase Shift Keying (CDPSK) is a phase shift keying in which the phase of the carrier frequency is modulated separately. The phase shift keying used in CDPSK modulation is the ... read more
coded orthogonal frequency division multiplex: COFDM
Coded Orthogonal Frequency Division Multiplex (COFDM) has been selected as the standard for terrestrial transmission of Digital Video Broadcasting (DVB) and DRM radio in Europe. In America s ... read on
continuous phase modulation: CPM
CPM modulation
Continuous Phase Modulation (CPM) is a phase modulation in which the phase position changes continuously. In contrast to other phase modulations such as phase shift keying (PSK), the ... read more
chirp spread spectrum: CSS
CSS modulation
Chirp Spread Spectrum (CSS) is a modulation method that was developed by Nanotron Technologies, Berlin. It is based on the so-called chirp pulse, a swept frequency pulse that ... read more
continuous variable slope delta modulation: CVSD
Continuous Variable Slope Delta Modulation (CVSD) is a type of delta modulation in which the step size of the approximated signal is gradually increased or decreased. The increase or min ... read on
continuous wave: CW
Continuous Wave (CW) means something like uniform wave. What is meant is an electromagnetic wave with a constant frequency and amplitude. The term Continuous Wave is used as keying ... read on
dynamic adaptive multi-carrier quadrature amplitude modulation: DAM-QAM
Dynamic Adaptive Multi-Carrier Quadrature Amplitude Modulation (DAM-QAM) is a dynamic transmission method for modems. With DAM-QAM modulation, the line signal consists of a large ... read on
differential binary phase shift keying: DBPSK
Differential phase shift keying (DPSK) is a type of phase shift keying in which the information is transmitted by changing the phase position of the carrier frequency. With DPSK keying, you can ... read on
differential code shift keying: DCSK
Differential code shift keying
Differential CodeShift Keying (DCSK) is a keying process that works with spread spectrum technology. It was developed by Ytran and is used by some manufacturers in powerline transmission in the car
differential pulse code modulation: DPCM
Differential pulse code modulation
Differential pulse code modulation (DPCM) is a lossy coding method in which the difference between two consecutive samples is coded. Dabe ... read on
double sideband reduced carrier: DSBRC
With amplitude modulation (AM), two frequency bands are created, one above the carrier frequency and another below the carrier frequency. Double sideband modulation with reduced T ... read on
double sideband suppressed carrier: DSBSC
With double sideband modulation, the carrier frequency is also transmitted. But there are two other variants in which the carrier frequency is reduced or suppressed. With the Double Sideband Reduced ... read on
Delta modulation
delta modulation: DM
Delta modulation (DM) is a type of differential pulse code modulation (DPCM) which differs in that the neighboring sample values ​​only read on by the values ​​+1 or -1 from the real sample value
Demodulation
demodulation
Demodulation, also known as detection, is the recovery of the modulation signal from a modulated carrier signal. With demodulation, the modulated carrier signals are ... read on depending on the module
Single sideband: ESB
single sideband: SSB
During the amplitude modulation of a carrier signal with a frequency band, two sidebands form below and above the carrier frequency, both of which read on the information content of the frequency band
frequency hopping spread spectrum: FHSS
Frequency hopping
Frequency Hopping Spread Spectrum (FHSS) is a frequency hopping method that is used in mobile communication and in WLANs. With this technology, the useful signal is eroded in leaps and bounds ... read on
Fourier transform
Fourier transformation: FT
A Fourier transformation (FT) is a mathematical process with which signals are transformed from the time domain into the frequency domain. It is therefore used to determine the frequency spectrum ... read on
Frequency modulation
frequency modulation: FM
Frequency modulation (FM) is a modulation method in which a high-frequency carrier oscillation is changed in frequency to the rhythm of the low-frequency signal frequency. The frequency module ... read on
Frequency jump
frequency hopping: FH
Frequency hopping (FH) is a radio transmission method that works with periodic frequency changes, in which the modulated carrier frequency changes abruptly, therefore also ... read on
Frequency shift
frequency shift
A frequency shift means switching from one frequency to another or shifting from one frequency to another. Every change in frequency of a receiver ... read on
Gaussian minimum shift keying: GMSK
GMSK modulation
Gaussian Minimum Shift Keying (GMSK) is a keying process that works as Minimum Shift Keying (MSK) and that is supplemented by an upstream Gaussian filter. GMSK module ... read on
inverse fast fourier transformation: IFFT
While a Fast Fourier Transformation (FFT) transforms a time-related signal in the time domain into a frequency-related signal in the frequency domain, the Inverse Fast Fourier Transformation reverses ... read more
independent sideband: ISB
The Independent Sideband Modulation (ISB) is a double sideband modulation (ZSB) in which each individual sideband is modulated with a different signal. This type of modulation is available ... read on
low probability of intercept: LPI
Low Probability of Intercept (LPI) is a technique designed to prevent eavesdropping on transmitter equipment. LPI technology relies on a wide variety of RF transmission technologies such as low send ... read on
multiband orthogonal frequency division multiplexing: MB-OFDM
Multiband OFDM (MB-OFDM) is a technology for high-speed local radio presented by the WiMedia Alliance. According to the ideas of WiMedia, MB-OFDM peripheral devices should be radio-connected with Hi ... read on
multi dimensional multiple access: MDMA
MDMA modulation
MDMA modulation (Multi Dimensional Multiple Access) combines the advantages of the classic modulation methods of amplitude modulation (AM), frequency modulation (FM) and phase modulation ... read more
modified modified frequency modulation: MMFM
MMFM process
Modified Modified Frequency Modulation (MMFM or M2FM) is a further development of Modified Frequency Modulation (MFM) with an improved algorithm that suppresses additional clock bits and ... read more
modulation transfer function: MTF
Modulation transfer function
The modulation transfer function (MTF), also known as the contrast transfer function, is a characteristic value of camera lenses. The aim is to be as realistic as possible ... read on
Massive MIMO
massive MIMO
Massive MIMO, also known as the Large-Scale AntennaSystem or Very Large MIMO, is a multi-antenna system that has antenna arrays made up of 128 to 1,024 active antenna elements at each base station
Multicarrier modulation
multicarrier modulation: MCM
Multi-carrier modulation (MCM) is a modern modulation technique that was developed several decades ago and is increasingly gaining in practical importance, especially in WLANs according to IEEE ... read on
modulation
modulation
Modulation is the change in signal parameters of a carrier frequency as a function of a modulating signal. The carrier signal is a time-dependent signal, for example a sluggish ... read more
Modulation code
modulation code
Due to the many coding methods and variants, the International Telecommunication Union (ITU) and the Federal Communications Commission (FCC) have modulation codes for better assignment and ... read on
Modulation index
modulation index
The modulation index is a characteristic of frequency modulation. It is designated with the Greek letter small-Eta and stands for the ratio of frequency deviation and modulation frequency. Da ... read on
Modulation method
modulation techniques
When it comes to modulation methods, a distinction is made between methods with amplitude, frequency and phase modulation. These types of modulation can be used for both analog signals and digital signals
narrow frequency modulation: NFM
Narrow band frequency modulation
Speech signals occupy a much lower frequency spectrum than audio signals such as music. For this reason, certain radio technologies for phoning transmission, such as radiotelephony, radio microphones ... read on
orthogonal frequency division multiplex: OFDM
Orthogonal Frequency Division Multiplex (OFDM) is an extremely bandwidth-efficient multicarrier method that requires a significantly lower frequency band than Freq ... read on
phase jitter modulation: PJM
Phase jitter modulation
Phase jitter modulation (PJM) is a phase modulation with extremely small phase changes that is used in RFID and is described in ISO 18000. With phase jitter modulation, there are ... read more
pulse number modulation: PNM
The Pulse Number Modulation (PNM) is one of several pulse modulations. Pulse Number Modulation (PNM) With this type of modulation, the modulated information content is narrowed down by a number of ... read on
pulse position modulation: PPM
Pulse position modulation
Pulse Position Modulation (PPM) is one of several pulse modulation methods. The classic PPM modulation has the clock signal as a reference reference; there is also the differential pulse ... read on
phase-shaped binary transmission: PSBT
PSBT modulation
Phase Shaped BinaryTransmission (PSBT) is a modulation method for the transmission of digital signals via fiber optic cables. The PSBZ modulation is mostly used in wavelength division multiplex (W ... read more
parallel sequence spread spectrum: PSSS
The radio technology method of the Parallel Sequence Spread Spectrum (PSSS) is based on the spread spectrum technology, whereby several cyclically shifted spreading sequences are superimposed. The PSSS process ... read on
Panda-Wegener method
Panda Wegener
In order to use as little bandwidth as possible for the sound transmission in the case of satellite transmission of analogue television and digital TV, the frequency of the sound modulated in frequency modulation must ... read on
Phase difference modulation
phase difference modulation: PDM
Phase difference modulation (PDM) is a special form of phase modulation (PM) in which the phase difference between two consecutive alternating current signals is transmitted in encrypted form
Phase modulation
phase modulation: PM
The phase modulation (PM) is an angle modulation of a carrier oscillation, in which the phase angle of the modulated oscillation differs from that of the carrier oscillation by an amount that is proportional ... read more
Pulse amplitude modulation
pulse amplitude modulation: PAM
Pulse amplitude modulation (PAM) is a pulse modulation (PM) in which the amplitude of a pulse-shaped carrier signal corresponds to the amplitude of the primary character oscillation (modulation signal) ... read more
Pulse code modulation
pulse code modulation: PCM
Pulse Code Modulation (PCM) is a widely used digital representation for analog audio signals. The International Telecommunication Union (ITU) has this type of modulation under ITU recommendation G.711 for ... read more
Pulse duration modulation
pulse duration modulation: PDM
Pulse duration modulation (PDM) is a modulation method in which the information to be transmitted is in the duration of the pulses. With this modulation method, which is called pulse width modula ... read on
Pulse density modulation
pulse density modulation: PDM
Pulse density modulation (PDM) is one of several pulse modulations. This type of modulation can be viewed as a combination of pulse width modulation and Pulse Position Modulation (PPM), because ... read more
Pulse rate modulation
pulse frequency modulation: PFM
With pulse frequency modulation (PFM), the pulse frequency is modulated and forms the modulated carrier signal. Pulse frequency modulation with a digital signal Pulse frequency modulation is e.g. in op ... read on
Pulse modulation
pulse modulation
Pulse modulation methods essentially correspond to classic modulation with the difference that the carrier signal is not a sinusoidal signal, but a pulse or square wave signal. Pulse modulation ... read on
Pulse phase modulation
pulse phase modulation: PPM
Pulse phase modulation (PPM) is another variant of pulse modulation (PM). With this modulation method, the pulse has a constant pulse amplitude and pulse width, the phase changes ... read on
Pulse width modulation
pulse width modulation: PWM
With pulse width modulation (PWM), a square wave signal is modulated in its pulse width. The pulse width modulation process, which is used in controllers, among other things, works with a constant pu ... read more
Quadrature amplitude modulation
quadrature amplitude modulation: QAM
Quadrature amplitude modulation (QAM) is a modulation method for high transmission density, in which the amplitude modulation and the phase modulation are combined with one another. The QAM modulation ... read on
Residual sideband: RSB
vestigial sideband: VSB
The remaining sideband modulation is a modulation method in which one sideband is modulated with full bandwidth, while the other is transmitted with a greatly reduced bandwidth. Da ... read on
return to zero differential quadrature phase shift keying: RZ-DQPSK
In optical networks, the data is transported in optical transport units (OTU). The international telecommunication union (ITU) has defined the data frames and the transmission rate in the ITU standard G.709 ... read more
spread frequency shift keying: S-FSK
S-FSK keying
Spread Frequency Shift Keying (S-FSK) is a spread spectrum shift keying (SS) that is used in PowerlineCommunication (PLC) and has lower interference with narrowband transmission than ... read more
spreading factor: SF
Spreading factor
In spread spectrum technology, the bit sequence to be transmitted is spread with a spreading frequency and a chip sequence is created. The smallest units of information within the co ... read on
space modulation: SM
Space modulation stands for space modulation. It is an amplitude modulation used in instrument landing systems. In order to meet the safety requirements in air traffic, work ... read on
time hopping spread spectrum: THSS
Time hopping (TH) means time jump. The corresponding modulation method is called Time Hopping Spread Spectrum (THSS) and is a spread spectrum technology. The THSS procedure is a time division multiplex be ... read on
time slotted channel hopping: TSCH
Time Slotted Channel Hopping (TSCH) is a time-synchronous channel hopping method that is part of the IEEE 802.15.4e standard. With TSCH hopping, all 16 channels are randomly assigned by 802.15.4, where ... read on
ultra narrow band: UNB
Ultra narrow band
Ultra Narrow Band (UNB) is a narrow band modulation method that works without the use of sidebands. It is a bandwidth-efficient modulation for the transmission ... read on
variable pulse width: VPW
Variable pulse width
Variable Pulse Width (VPW) means variable pulse width. The VPW function is a function in which the pulse width is changed at a constant pulse frequency. With this function, the touch screen can ... read on
Vector modulation
vector modultaion: VM
Analog signals are clearly described by their frequency, amplitude and phase. The combination of phase position and amplitude represents a vector, the size of which is determined by the change in the Ph