As expected, the MLE with AF transmission, marked as AF, is inferior to the MLE with digital communication using 4-bits quantization, marked as MLE CSI.
Modern digital communication uses combinations and variations in the basic methods to achieve high bandwidth efficiency, or conversely, high signal-to-noise ratio with relatively low power.
Digital implementation of 90° phase shifters is in high demand as many of the digital communication systems use FPGAs [4 6].
Many recent wide-band digital communication systems use a multi-carrier technology known as orthogonal-frequency-division-multiplexing (OFDM), where the band is divided into many narrow-band channels.
Many of today's digital communication systems use orthogonal frequency division multiplexing (OFDM) [1] as physical layer interface, mainly because of its robustness against frequency-selective channels and easy means of implementation.
The Airwave Health Monitoring Study was established to evaluate possible health risks associated with use of TETRA, a digital communication system used by police forces and other emergency services in Great Britain since 2001.
In this paper we propose some secure digital communication schemes using discrete chaotic systems.
Ka frequency, which is starting to replace Ku frequency, allows satellites to carry two-way digital communication by using "spot beams".
Since Square QAM retains a high minimum distance between constellation points and has simple detection technique, plenty of the digital communication systems using high modulation orders with 16 or greater number of constellation points have been utilizing the SQAM.
Direct applications of FFT include spectral analysis, spectral estimation, image processing, interpolation, decimation, convolution, correlation, filtering, etc. FFT is also used in all wideband digital communication systems, which use orthogonal frequency division multiplexing (OFDM) as the modulation technique.
