Coexistence and transmission of multiple radios over seamless fiber-wireless systems
Coexistence and transmission of multiple radios over seamless fiber-wireless systems
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DOI：
10.1117/12.2251254
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Pham Tien Dat;A. Kanno;N. Yamamoto;T. Kawanishi
中科院分区：
文献类型：
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作者：
Pham Tien Dat;A. Kanno;N. Yamamoto;T. Kawanishi
在本文中，我们提出了通过无缝光纤无线系统同时传输多个无线电信号的有效解决方案，包括传统微波频段和高频频段的无线电信号。在中心站处，可以使用数据映射算法和/或子载波复用技术将无线电信号映射到相同的光传输信道上。在光纤传输之后，接收到的信号可以被下变频、数字化和解映射以恢复原始传输的信号。我们提出并比较了两种不同的方法，包括在远程站点的无线电光纤系统和光上变频，以及在远程站点的中频光纤系统和电上变频。我们通过实验确认了这两种传输方法的适用性，并对所有信号（包括高级LTE、正交频分复用和滤波正交频分复用信号）实现了令人满意的性能。特别是，后一种方法可以提供高光谱效率和低光纤色散效应，适合未来移动的网络中的超密集小小区部署。
In this paper, we present efficient solutions for simultaneous transmission of multiple radio signals over seamless fiber wireless systems, including radio signals in legacy microwave bands and in high frequency bands. At central stations, radio signals can be mapped onto the same optical transport channel using data mapping algorithms and/or subcarrier multiplexing technique. After the fiber transmission, the received signals can be down-converted, digitized, and de-mapped to recover the originally transmitted signals. We present and compare two different methods, including a radio-over-fiber system and optical up-conversion at remote sites and an intermediate-frequency-over-fiber system and an electrical up-conversion at remote sites. We experimentally confirm the suitability of both the transmission methods, and achieve satisfactory performance for all signals, including LTE-advanced, orthogonal frequency-division multiplexing, and filtered-orthogonal frequency-division multiplexing signals. In particular, the latter method can provide a high optical spectral efficiency and low fiber dispersion effect and is suitable for ultra-dense small cell deployment in future mobile networks.