Coded modulation faster-than-Nyquist transmission with precoder and channel shortening optimization

Faster-than-Nyquist (FTN) signaling can improve the spectrum efficiency (SE) of the transmission system. In this paper, we propose a coded modulation FTN (CM-FTN) transmission scheme with precoder and channel shortening (CS) optimization to improve bit error rate (BER) performance and reduce the com...

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Bibliographic Details
Published in:China communications Vol. 18; no. 2; pp. 49 - 64
Main Authors: Che, Hui, Bai, Yong
Format: Journal Article
Language:English
Published: China Institute of Communications 01.02.2021
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China%School of Information and Communication Engineering, Hainan University, Haikou 570228, China
Subjects:
channel shortening
coded modulation
Complexity theory
Convolution
Convolutional codes
Equalizers
faster-than-Nyquist
information rate
minimum Euclidian distance
Optimization
pre-coder
Precoding
Signal to noise ratio
channel shortening
minimum Euclidian distance
information rate
faster-than-Nyquist
coded modulation
pre-coder
ISSN:1673-5447
Online Access:Get full text
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Summary:Faster-than-Nyquist (FTN) signaling can improve the spectrum efficiency (SE) of the transmission system. In this paper, we propose a coded modulation FTN (CM-FTN) transmission scheme with precoder and channel shortening (CS) optimization to improve bit error rate (BER) performance and reduce the complexity of FTN equalizer. In our proposal, the information rate (IR) or spectral efficiency (SE) is employed and verified as a better performance metric for CM-FTN than the minimum Euclidian distance (MED). The precoder of CM-FTN is optimized for maximizing the IR criterion using the bare-bones particle swarm optimization (BB-PSO) algorithm. Further, a three-carrier CM-FTN system model is used to capture the broadening effect of precoder. Also targeting for the IR maximization, the inter-symbol interference (ISI) length for CS is optimized to reduce the receiver complexity without performance loss. Simulation results demonstrate that our method has a 0.6dB precoding gain compared with the non-precoding scheme and a maximum of 87.5% of the complexity of FTN equalizer is reduced without BER loss.
ISSN:1673-5447
DOI:10.23919/JCC.2021.02.005