In this paper, we present a method of constructing PAM constellations with non-uniform
spacing by determining the symbol amplitudes based on warping the uniform distancing by …

There has been a rejuvenated interest in the use of non-equally spaced (irregular)
constellations after promising performance results were demonstrated compared with the …

Finding the best signal constellation for different communication channels is one of the
fundamental problems in digital communication. This problem has been studied widely from …

Fifth generation new radio aims to facilitate new use cases in wireless communications.
Some of these new use cases have highly demanding latency requirements; many of the …

In wireless channels, the signal quality degrades mainly due to the additive noise and the
random variation of attenuation of the signal, known as fading. The additive noise can be …

This paper presents signal space constellations that minimize symbol-error probability in an
uncoded communications system. We develop a modified projected gradient optimization …

A cognitive radio is a smart software-defined radio that can adapt its transmission
parameters, such as transmit power level and modulation type, based on the wireless …

Relay has been identified as a fundamental feature in LTE-Advanced in order to achieve
LTE-A requirements. The conventional straightforward relaying scheme named decode-and …

This work focuses on the interplay between rotation angle, transmit power, fading severity,
and noise impairment severity in signal space diversity-based three time-slot decode-and …

Utilizing multiple antennas at the transmitter and receiver provides higher data rates and
better reliability by exploiting spatial diversity. Space-time block codes (STBCs) is a simple …