TY - JOUR
T1 - Performance analysis and optimization of unipolar OFDM based relay-assisted visible light communications☆
AU - Narmanlioglu, Omer
AU - Djengomemgoto, Gerard
AU - Uysal, Murat
N1 - Funding Information:
This work was supported by the Turkish Scientific and Research Council (TUBITAK) under Grant 215E311 .
Publisher Copyright:
© 2017 Elsevier GmbH
PY - 2017/12
Y1 - 2017/12
N2 - In this paper, we consider a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source. Following the IEEE 802.15.7r1 VLC reference channel model, we assume the presence of two different light sources in an office space. The first one is the ceiling light that serves as the source terminal while the second one is the desk lamp that serves as the relay terminal. Our system builds upon unipolar optical orthogonal frequency division multiplexing (U-OFDM) where the desk light performs amplify-and-forward relaying to assist the ceiling light and operates in a half-duplex mode. In addition, we consider the use of enhanced U-OFDM (eU-OFDM) which doubles the spectral efficiency of U-OFDM at the expense of additional computational complexity. We analyze the bit error rate performance of the relay-assisted VLC system building on these two OFDM types and quantify performance improvements over point-to-point (i.e., no relaying) VLC systems. In an effort to further improve system performance, we investigate optimal power allocation between source and relay terminals.
AB - In this paper, we consider a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source. Following the IEEE 802.15.7r1 VLC reference channel model, we assume the presence of two different light sources in an office space. The first one is the ceiling light that serves as the source terminal while the second one is the desk lamp that serves as the relay terminal. Our system builds upon unipolar optical orthogonal frequency division multiplexing (U-OFDM) where the desk light performs amplify-and-forward relaying to assist the ceiling light and operates in a half-duplex mode. In addition, we consider the use of enhanced U-OFDM (eU-OFDM) which doubles the spectral efficiency of U-OFDM at the expense of additional computational complexity. We analyze the bit error rate performance of the relay-assisted VLC system building on these two OFDM types and quantify performance improvements over point-to-point (i.e., no relaying) VLC systems. In an effort to further improve system performance, we investigate optimal power allocation between source and relay terminals.
KW - Cooperative communications
KW - OFDM
KW - Relay-assisted transmission
KW - Visible light communication
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U2 - 10.1016/j.ijleo.2017.08.005
DO - 10.1016/j.ijleo.2017.08.005
M3 - Article
AN - SCOPUS:85029168347
SN - 0030-4026
VL - 151
SP - 77
EP - 87
JO - Optik
JF - Optik
ER -