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Journal of Electrical and Computer Engineering
Volume 2015, Article ID 367693, 10 pages
Research Article

A Scaling Scheme for DCT Precoded Optical Intensity-Modulated Direct Detection Systems

1School of Information and Electronic Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
2State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
3College of Information Engineering, China Jiliang University, Hangzhou 310018, China

Received 9 September 2015; Accepted 12 November 2015

Academic Editor: Iraj Sadegh Amiri

Copyright © 2015 Zhongpeng Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A scaling technique is employed to improve the performance of a Discrete Cosine Transform (DCT) precoded optical intensity-modulated direct detection (IM/DD) OFDM system, which fully exploits the dynamic range of a digital-to-analog converter (DAC). The theoretical analysis shows that the proposed scaling scheme can improve the BER performance of DCT precoded and scaled OFDM systems. The experiment results also show that the proposed scheme significantly improves the BER performance without changing the receiver structure. The measured received sensitivity at a BER of 10−3 for a 4 G samples/s (2.7 Gbits/s) DCT precoded and scaled OFDM signal and after 100 km standard single-mode fiber (SMF) transmission has been improved by 3 and 1.3 dB when compared with the original OFDM system and conventional DCT precoded OFDM system, respectively.