I. J. of Electrical & Electronics Research
Research Article | 
Amplify-and-Forward (AF) Relay Techniques in Wireless SC-FDE Systems to Enhance Diversity Gains
Author(s): Min-A Lee1, Yu-Ra Heo2 and Eui-Rim Jeong3*
Published In : International Journal of Electrical and Electronics Research (IJEER) Volume 11, Issue 2
Publisher : FOREX Publication
Published : 30 June 2023
e-ISSN : 2347-470X
Page(s) : 490-494
Abstract
This paper introduces an amplify-and-forward (AF) relaying technique that employs phase dithering and intentional delay within single carrier-frequency domain equalizer (SC-FDE) systems. The proposed relaying technique aims to increase the gain of both frequency diversity and time diversity in slow fading channels. To achieve this, the proposed technique introduces random phase rotation and random intentional delay. The relaying scenario assumes two-hop communication with relaying between the source and destination. It is assumed that many nodes are densely distributed, allowing for many relay nodes to participate in relaying. To verify the performance through computer simulation, the number of relays is 1, 2, 3, 5, 15, and 25, and three modulation coding schemes (MCSs) are considered: QPSK with R=1/3, 16QAM with R=3/4, and 8PSK with R=7/8. The simulation results demonstrate that the proposed relaying technique improves the bit error ratio (BER) performance. The performance improves as the number of relays increases.
Keywords: SC-FDE, AF Relaying, Phase Dithering, Intentional Delay, Time Diversity, Frequency Diversity, Two-hop Relay.
Min-A Lee, Department of Mobile Convergence Engineering, Hanbat National University, Daejeon, Republic of Korea; Email: leemina316@gmail.com
Yu-Ra Heo, Department of Mobile Convergence Engineering, Hanbat National University, Daejeon, Republic of Korea; Email: 1022hu@gmail.com
Eui-Rim Jeong*, Department of Artificial Intelligence Software, Hanbat National University, Daejeon, Republic of Korea; Email: erjeong@hanbat.ac.kr
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