NDLI: Investigation of blind CFO estimation for GFDM system using universal software radio peripheral: theory, simulations and experiments

Content Provider	IET Digital Library
Author	Valluri, Siva Prasad Mani, Vakamulla Venkata
Abstract	Generalised frequency division multiplexing (GFDM) utilises a circular pulse shaping mechanism to hinder out-of-band emissions and for achieving low latency. However, fallacious synchronisation of this multicarrier technique would lead to severe inter carrier interference and inter symbol interference. Conventional training sequence-based methods alleviate the effect of time and frequency misalignments by using the concept of data repetition in the pilot preamble, which recedes data efficacy. This study enlightens various aspects in real-time implementation of blind GFDM signal transceiver using oversampling for carrier frequency offset (CFO) correction in indoor environments. It is observed that the phase shift between neighbouring sample points in an oversampled GFDM symbol is constant throughout the symbol duration. This phase shift is found to be unassociated with either subcarrier or subsymbol indices. Using this property, the maximum likelihood estimate of the CFO is deduced and is analysed in various channel environments. The Cramer–Rao lower bound for the oversampling-based GFDM signal model is derived and the authors prove through simulation that the proposed algorithm results in a little error floor. The results obtained in simulations have been validated with real-time test bed built with universal software radio peripheral 2953R as hardware and LabVIEW as software.
Starting Page	1936
Ending Page	1944
Page Count	9
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 13, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5867
Journal	IET Communications
Publisher Date	2019-05-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	(CFO) Correction Blind CFO Estimation Blind GFDM Signal Transceiver Carrier Frequency Channel Environments Channel Estimation Circular Pulse Communication Channel Equalisation And Identification Conventional Training Sequence-based Method Data Efficacy Data Repetition Electromagnetic Compatibility Fallacious Synchronisation Frequency Division Multiplexing Frequency Estimation Frequency Misalignments Generalised Frequency Division GFDM System Indoor Environments Intercarrier Interference Interference Interpolation And Function Approximation Maximum Likelihood Estimate Maximum Likelihood Estimation Modulation And Coding Method Multicarrier Technique Neighbouring Sample Point Numerical Analysis OFDM Modulation Out-of-band Emission Oversampled GFDM Symbol Oversampling-based GFDM Signal Model Phase Shift Pilot Preamble Pulse Shaping Radio Link And Equipment Real-time Implementation Real-time Test Bed Severe Inter Carrier Interference Simulations Software Radio Statistics Subcarrier Symbol Duration Symbol Interference Synchronisation Universal Software Radio Peripheral 2953R
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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