正交频分复用
副载波
电子工程
计算机科学
加性高斯白噪声
强度调制
光谱效率
调制(音乐)
多径传播
带宽(计算)
发射机
脉冲位置调制
电信
频道(广播)
脉冲幅度调制
物理
工程类
相位调制
相位噪声
探测器
声学
脉搏(音乐)
作者
Jean Armstrong,B. Schmidt,Dhruv Kalra,Himal A. Suraweera,Arthur J. Lowery
出处
期刊:Globecom
日期:2006-11-01
被引量:92
标识
DOI:10.1109/glocom.2006.571
摘要
Orthogonal frequency division multiplexing (OFDM) is used in many wired and wireless broadband communication systems because of its resilience in the presence of signal dispersion or multipath distortion. OFDM has not been used in practical optical communication systems because the bipolar waveform cannot be used in intensity-modulated direct detection (IM/DD) systems. A new unipolar form of OFDM, asymmetrically clipped optical OFDM (ACO-OFDM), has recently been developed. For the case of an AWGN channel, we compare ACO- OFDM and other modulation schemes. It is shown that ACO- OFDM with 4-QAVI subcarrier modulation has the same bandwidth efficiency but requires 2 dB less energy per bit than on-off keying. ACO-OFDM with larger constellation sizes gives higher bandwidth efficiencies and lower optical power than other modulation schemes. Unlike existing methods, the performance of ACO-OFDM is limited by the bandwidth of the transmitter and receiver not the dispersion of the channel.
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