발간년도 : [2016]
| 논문정보 |
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| 논문명(한글) |
[Vol.11, No.5] A Study on Transmission of Scalable Video Coding Signals using Hybrid-Multiplexing Scheme based on OVSF Codes in VLC |
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| 논문투고자 |
Kyun-Tak Kim, Kyu-Jin Lee |
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| 논문내용 |
In this paper, we propose a hybrid-multiplexing scheme in order to effectively transmit scalable video coding (SVC) signals in the visible light communication systems. SVC signals are composed of one base layer (level 0) and several enhance layers (level 1~L). In the transmission systems of SVC signals, base layer’s signals must achieve the best bit error rate (BER) performance. Also, in enhance layers, the improved BER performance is required, when the level of those is reduced. Hence, those SVC layers have different weights in accordance with each layer’s level. Based on those characteristics, SVC signals can be multiplexed by allocating the orthogonal spreading codes with different lengths, and those orthogonal codes are called as orthogonal variable spreading factor (OVSF) codes. However, in the conventional code division multiplexing (CDM) systems, inter-code interference (ICI) is increased, when the number of multiplexing blocks is increased. So, the BER performance of SVC transmission systems is degraded. To overcome those problems, our proposed system combines CDM with time division multiplexing (TDM) based on OVSF codes. When the proposed multiplexing scheme was adopt to the SVC transmission system, the number of multiplexing blocks can be decreased and the BER performance can be improved by reducing the ICI effects. Through the simulation results, we demonstrate the effectiveness of our proposed system. |
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