QAM is both an analog and a digital modulation
Hierarchical digital modulation
classification using cummulants IEEE Trans.
is an important factor in communication system.
Suppose that the signal serial is independent identically distributed, and that E is the signal energy, the fourth order cumulants' theoretical values of the common digital modulation
signals are shown in Table 1 [17-19].
Covering first modulation and detection, then information theory and coding schemes, they discuss such topics as wireless channels, digital modulation
techniques, data-aided algorithms for channel estimation, elements of information theory, classical and modern coding schemes, and combined equalization and decoding.
This move towards a faster, higher volume service has been facilitated by an upgrade of the digital modulation
scheme of the KA-SAT infrastructure, from 8PSK to 16APSK, generating a significant increase in the system's total throughput.
Many of modern communication systems are based on wireless technologies which use different digital modulation
Data conversion and signal processing technology company Analog Devices Inc (ADI) introduced on Monday the AD9128, a 16-bit, 1.25-GSPS transmit D/A converter (DAC) with integrated complex digital modulation
functionality and featuring a JESD204A-compatible serial input.
And QAM, or quadrature amplitude modulation, is an analog and digital modulation
scheme that conveys data by changing some aspect of a carrier signal, or wave, (usually a sinusoid) in response to a data signal.
RF directional modulation technique is proposed for the physical layer secure communication in the paper [1-5], which synthesizes a digital modulation
signal fully or partially in the RF portion of the transmitter.