Title :
Improving energy efficiency of partial response signals by using coded modulation
Author :
Gorlov, Anton ; Gelgor, Aleksandr ; Popov, Evgenii
Author_Institution :
Dept. of Radioelectron. Means of Inf. Protection, Peter the Great St. Petersburg Polytech. Univ., St. Petersburg, Russia
Abstract :
One of the most popular approaches to improving bandwidth efficiency is the use of signals with inter-symbol interference (ISI). In this paper bandwidth-efficient partial response signals (PRS) are analyzed in combinations with 4-QAM, 8-QAM and 16-QAM signal constellations and recursive systematic convolutional codes. We simulated transmission of encoded data through AWGN channel using the optimal PRS, each pulse shape gave maximal free Euclidean distance for chosen constellation and bandwidth. Also, we employed iterative receiver (or turbo equalizer) for detection and decoding of these signals. It is shown that the coded PRS exceed trellis-coded modulation and reach turbo trellis-coded modulation in bandwidth and energy characteristics.
Keywords :
AWGN channels; convolutional codes; energy conservation; intersymbol interference; modulation coding; quadrature amplitude modulation; 16-QAM signal; 4-QAM signal; 8-QAM signal; AWGN channel; bandwidth efficiency; bandwidth efficient partial response signals; coded modulation; energy efficiency; intersymbol interference; recursive systematic convolutional codes; Bandwidth; Conferences; Constellation diagram; Estimation; Euclidean distance; Receivers; iterative receiver; partial response signals; trellis-coded modulation; turbo equalizer;
Conference_Titel :
Communications and Networking (BlackSeaCom), 2015 IEEE International Black Sea Conference on
Conference_Location :
Constanta
DOI :
10.1109/BlackSeaCom.2015.7185086