A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

A flexible subcarrier multiplexing system combining analog transport with digital domain processing is presented. By making use of bandpass sampling and applying a systematic mapping of signals into available Nyquist zones, the multiplexing system is able to present multiple signals at the same inte...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-07, Vol.37 (14), p.3689-3700
Main Authors: Noor, Shabnam, Assimakopoulos, Philippos, Gomes, Nathan J.
Format: Article
Language:English
Subjects:
5G mobile communication
Amplitude modulation
Analog to digital conversion
Analog to digital converters
Bandpass
Bandwidth
Bandwidths
Computer simulation
Digital signal processing
Frequency-domain analysis
Mapping
massive-MIMO (mMIMO)
millimeter wave (mmW)
MIMO communication
mobile fronthaul
Model matching
Multiplexing
Next generation networking
radio-over-fiber
Sampling
subcarrier multiplexing (SCM)
Subcarriers
Transport
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Summary:A flexible subcarrier multiplexing system combining analog transport with digital domain processing is presented. By making use of bandpass sampling and applying a systematic mapping of signals into available Nyquist zones, the multiplexing system is able to present multiple signals at the same intermediate frequency at the remote site. This simplifies the processing required for multiple antenna systems. We further propose the use of track-and-hold amplifiers at the remote site. These elements are used to extend the mapping to a mapping hierarchy, offering flexibility in frequency placement of signals and relaxation of analog-to-digital converter bandwidth and sampling rate constraints. The system allows the transport of different numerologies in a number of next generation radio access network scenarios. Experimental results for large signal multiplexes with both generic and 5th-generation mobile numerologies show error-vector magnitude performance well within specifications, validating the proposed system. Simulation results from a system model matched to these experimental results provide performance predictions for larger signal multiplexes and larger bandwidths.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2918215