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Space modulation is a radio amplitude modulation technique used in instrument landing systems (ILS) that incorporates the use of multiple antennas fed with various radio frequency powers and phases to create different depths of modulation within various volumes of three-dimensional airspace. This modulation method differs from internal ...
Adaptive modulation; Space modulation is a method whereby signals are modulated within airspace such as that used in instrument landing systems. The microwave auditory effect has been pulse modulated with audio waveforms to evoke understandable spoken numbers. [5] [6] [7]
Spatial modulation is a technique that enables modulation over space, across different antennas (radio) at a transmitter. [1] [2] Unlike multiple-input and multiple-output (MIMO) wireless (where all the transmitting antennas are active and transmitting digital modulated symbols such as phase-shift keying and quadrature amplitude modulation), in spatial modulation, only a single antenna among ...
Modulation spaces [1] are a family of Banach spaces defined by the behavior of the short-time Fourier transform with respect to a test function from the Schwartz space.They were originally proposed by Hans Georg Feichtinger and are recognized to be the right kind of function spaces for time-frequency analysis.
Space vector modulation (SVM) is an algorithm for the control of pulse-width modulation (PWM), invented by Gerhard Pfaff, Alois Weschta, and Albert Wick in 1982. [1] [2] It is used for the creation of alternating current (AC) waveforms; most commonly to drive 3 phase AC powered motors at varying speeds from DC using multiple class-D amplifiers.
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.
A modulation depth comparison navigational aid (MDCNA), also known as an Instrument landing System, uses the concept of space modulation to provide guidance to aircraft when on final approach.
Orthogonal Time Frequency Space (OTFS) is a 2D modulation technique that transforms the information carried in the Delay-Doppler coordinate system. The information is transformed in a similar time-frequency domain as utilized by the traditional schemes of modulation such as TDMA , CDMA , and OFDM . [ 1 ]