Low-Cost MIMO Radio Over Fiber System for Multi-Service DAS Using Double Sideband Frequency Translation
Journal of Lightwave Technology
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Yang, Y., Crisp, M., Penty, R., & White, I. (2016). Low-Cost MIMO Radio Over Fiber System for Multi-Service DAS Using Double Sideband Frequency Translation. Journal of Lightwave Technology https://doi.org/10.1109/JLT.2016.2582082
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 20MHz bandwidth, and a 700MHz carrier frequency, are transmitted simultaneously along with an IEEE 802.11g signal (54Mbps) over a 300m 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 802.11g signal. The use of a preamplifier minimizes the non-linearity 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).
indoor radio communication, distributed antenna system (DAS), radio-over-fiber (ROF), optical fiber, multiplexing, multiple-input-multiple-output (MIMO)
This work was supported in part of the UK Engineering and Physical Sciences Research Council via the COPOS II grant and the European Community via the FP7 programme Quaternian project.
External DOI: https://doi.org/10.1109/JLT.2016.2582082
This record's URL: https://www.repository.cam.ac.uk/handle/1810/256717