Low-Cost MIMO Radio Over Fiber System for Multiservice DAS Using Double Sideband Frequency Translation
Low-Cost MIMO Radio Over Fiber System for Multiservice DAS Using Double Sideband Frequency Translation
复制标题
使用双边带频率转换的用于多服务 DAS 的低成本 MIMO 光纤无线电系统
DOI：
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复制
发表时间：
2016
影响因子：
4.7
通讯作者：
I. White
中科院分区：
文献类型：
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作者：
Yumeng Yang;M. Crisp;R. Penty;I. White
本文对一种新型的低成本DSB频率变换系统进行了实验研究，并从数学上证明了其理论。新系统能够传输宽带LTE MIMO信号并支持多种服务。实验上，具有20 MHz带宽和700 MHz载波频率的2 × 2 LTE MIMO信道与IEEE 802.11 g信号（54 Mbps）一起在300 m长的多模光纤（MMF）上同时沿着传输。通过计算MIMO系统的条件数，得到了系统的MIMO信道矩阵。从实验结果可以看出，系统状态良好，具有低误差向量幅度（EVM），并且MIMO信号的传输对IEEE 802.11 g信号的影响可以忽略不计。使用ADC可最大限度地降低混频器引入的非线性，从而实现高无杂散动态范围（SFDR）。与单边带（SSB）系统相比，其中使用多个滤波器并且两个信道遇到不同的EVM，新的DSB系统避免了不必要的滤波，并且引入的损伤对于两个信道将是相同的。因此，可以得出结论，使用DSB频率转换技术的改进的MIMO光纤系统是一个潜在的低成本的多业务MIMO使能的分布式天线系统（DAS）的解决方案。
In this paper, a novel low-cost DSB frequency translation system is experimentally demonstrated and its theory is mathematically proved. The new system is capable of transmitting wideband LTE MIMO signals and supporting multiple services. Experimentally, 2 × 2 LTE MIMO channels with 20 MHz bandwidth, and a 700 MHz carrier frequency, are transmitted simultaneously along with an IEEE 802.11 g signal (54 Mbps) over a 300 m length of multi-mode fiber (MMF). The MIMO channel matrix of the system is retrieved and the condition number is calculated. It can be seen in the experimental results that the system is well conditioned, has a low-error vector magnitude (EVM) and the transmission of the MIMO signals has negligible effect on the IEEE 802.11 g signal. The use of a preamplifier minimizes the nonlinearity introduced by the frequency mixers, resulting in a high spurious-free dynamic range (SFDR). Compared to a single sideband (SSB) system, where multiple filters are used and two channels encounter different EVMs, the new DSB system avoids unnecessary filtering and the impairments introduced will be the same for both channels. Therefore it can be concluded that the improved MIMO over fiber system using DSB frequency translation technology is a potential low-cost solution for multiservice MIMO-enabled distributed antenna systems (DAS).