Photonic-aided pre-coding QAM signal transmission in multi-antenna radio over fiber system
Photonic-aided pre-coding QAM signal transmission in multi-antenna radio over fiber system
复制标题
多天线光纤无线电系统中的光子辅助预编码QAM信号传输
DOI：
10.1016/j.optcom.2015.05.067
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发表时间：
2015-11
影响因子：
2.4
通讯作者：
Gee-Kung Chang
中科院分区：
文献类型：
--
作者：
Xinying Li;Ming Zhu;Xiangjun Xin;Gee-Kung Chang
提出并实验证明了一种在光纤多天线无线电系统中提供光子辅助预编码正交幅度调制(QAM)信号传输以提高吞吐量的新方法。对于下行链路，两种不同的多电平幅度移位键控(M-ASK)调制信号，例如4-ASK信号，被施加在中心局的两个不相关的光Mach-Zehnder调制器上。在该系统中，接收到的来自两个远程接入单元(RAU)的M-ASK毫米波经过光子辅助预编码模块和光检测处理后，可以合成成M2-QAM信号。不考虑前向纠错(FEC)编码开销，4-GB/S和8-GB/S 16-QAM毫米波信号分别从两个独立的2-GB/S和4-GB/S 4-ASK 40 GHz信道获得。实验结果表明，在不增加数字信号处理(DSP)的情况下，在小蜂窝RAU和移动用户中，可以获得比原来的4-ASK码率高一倍的比特率。
A novel method has been proposed and experimentally demonstrated to provide photonic-aided pre-coding quadrature amplitude modulation (QAM) signal transmission in multi-antenna radio over fiber system to increase the throughput. For downlink, two different multi-level amplitude-shift-keying (M-ASK) modulated signals, such as 4-ASK signals, are applied on two uncorrelated optical Mach–Zehnder modulators at central office. After photonic-aided pre-coding module and photo-detection process, the received M-ASK mm-waves from two remote access units (RAUs) can be synthesized to a M2-QAM signal in the proposed system. Regardless of forward error correction (FEC) coding overhead, the 4-Gb/s and 8-Gb/s 16-QAM mm-wave signals are obtained from two independent 2-Gb/s and 4-Gb/s 4-ASK 40-GHz channels, respectively. The experimental results show that a doubled bit rate of the original 4-ASK one can be achieved without additional digital signal processing (DSP) in small cell RAUs and mobile users.
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