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MIMO radio-over-fibre distributed antenna system for next generation wireless communication
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yang, Yumeng |
| Copyright Year | 2018 |
| Abstract | This thesis introduces low-cost implementations for the next generation distributed antenna system (DAS) using analogue radio over fibre. A multiple-input-multiple-output (MIMO) enabled radio over fibre (RoF) system using double sideband (DSB) frequency translation system is proposed. In such a system, the 2x2 MIMO signals can be transmitted to the remote antenna units (RAUs) from the base station via a single optical link. By using the DSB frequency translation, the original single-input-single-output (SISO) DAS can be upgraded into the MIMO DAS without implementing parallel optical links. Experimentally, the DSB frequency translation 2x2 MIMO RoF system transmits 2x2 LTE MIMO signals with 20MHz bandwidth in each channel via a 300m MMF link. The condition number of the system is <10dB within the power equaliser bandwidth which means the MIMO system is wellconditioned and the crosstalk between the channels can be compensated by the MIMO signal processing. To install the DSB frequency translation system in a wideband service-agnostic DAS, the original MIMO signals need to be translated into unoccupied frequency bands over the DAS, which are usually occupied by specific applications that are not to be transmitted over the DAS. The frequency spectrum allocation of the wireless services is analysed showing that by choosing a particular LO frequency (2.2GHz in the UK), in the DSB frequency translation system, the original MIMO signals can always be translated into unoccupied frequency bands so that the same infrastructure can support multiple services. The idea of DSB frequency translation system can not only support MIMO radio over fibre but can also improve the SFDR of a general radio over fibre system. Because when the upper sideband and the lower sideband of the signal after translation are converted back to the original frequency band, the noise adds incoherently but the signals add-up coherently, this gives the system theoretically 2dB 3 order SFDR improvement. If the idea of the DSB frequency translation is extended into a higher number of sidebands, the system SFDR can be further improved. Experimentally, the system 3 order SFDR can be improved beyond the intrinsic |
| File Format | PDF HTM / HTML |
| DOI | 10.17863/CAM.17803 |
| Alternate Webpage(s) | https://www.repository.cam.ac.uk/bitstream/handle/1810/270865/Yumeng-2018-PhD.pdf?isAllowed=y&sequence=5 |
| Alternate Webpage(s) | https://doi.org/10.17863/CAM.17803 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
