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Digital Processing for an Analogue Subcarrier Multiplexed Mobile Fronthaul

Noor, Shabnam (2019) Digital Processing for an Analogue Subcarrier Multiplexed Mobile Fronthaul. Doctor of Philosophy (PhD) thesis, University of Kent,. (KAR id:74343)

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Abstract

In order to meet the demands of the fifth generation of mobile communication networks (5G), such as very high bit-rates, very low latency and massive machine connectivity, there is a need for a flexible, dynamic, scalable and versatile mobile fronthaul. Current industry fronthaul standards employing sampled radio waveforms for digital transport suffer from spectral inefficiency, making this type of transport impractical for the wide channel bandwidths and multi-antenna systems required by 5G. On the other hand, analogue transport does not suffer from these limitations. It is, however, prone to noise, non-linearity and poor dynamic range. When combined with analogue domain signal aggregation/multiplexing, it also lacks flexibility and scalability, especially at millimetre wave frequencies.

To this end, over the last few years, there has been significant investigation of analogue transport schemes combined with digital channel aggregation/ de-aggregation (combining/ separating multiple radio waveforms in the digital domain). This work explores such a technique.

The analogue transport signal generated in this manner is digitally filtered and band-pass sampled at the receiver such that each corresponding channel (e.g. channels destined to the same radio frequency (RF)/ millimetre wave (mmW) frequency) in the multiplex is presented at the same intermediate frequency, due to the mapping employed at the transmitter. Analogue or digital domain mixers/ down-converters are not required with this technique. Furthermore, each corresponding channel can be readily up-converted to their respective RF/mmW channels with minimal per-signal processing. Measurement results, matched in simulation, for large signal multiplexes with both generic and 5G mobile numerologies show error-vector magnitude performance well within specifications, validating the proposed system.

The multiplexing technique presented in this work thus allows reductions in per-channel processing for heterogeneous networking (or multi-radio access technologies) and multi-antenna configurations. It also creates a re-configurable and adaptable system based on available processing resources, irrespective of changes to the number of channels and channel groups, channel bandwidths and modulation formats.

Item Type: Thesis (Doctor of Philosophy (PhD))
Thesis advisor: Gomes, Nathan
Thesis advisor: Wang, Chao
Uncontrolled keywords: Fifth Generation of Mobile Communication Networks (5G), Radio-over-Fibre (RoF), Analogue Mobile Fronthaul, Subcarrier Multiplexing (SCM), Intermediate Frequency over Fibre (IFoF), massive-MIMO (mMIMO), Millimetre Wave (mmW), Digital Signal Processing
SWORD Depositor: System Moodle
Depositing User: System Moodle
Date Deposited: 10 Jun 2019 16:10 UTC
Last Modified: 20 May 2021 13:26 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/74343 (The current URI for this page, for reference purposes)
Noor, Shabnam: https://orcid.org/0000-0001-8258-8466
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