Performance of GFDM Systems Using Quadratic Programming Pulse Shaping Filter Design

Generalized Frequency Division Multiplexing (GFDM) has been considered as an attractive candidate to replace Orthogonal Frequency Division Multiplexing (OFDM) for the fifth generation (5G) mobile networks. GFDM system has better spectral characteristics compared to the OFDM system due to the use of...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.37134-37146
Main Authors: Sim, Zee Ang, Juwono, Filbert H., Reine, Regina, Zang, Zhuquan, Gopal, Lenin
Format: Article
Language:English
Subjects:
5G mobile communication
filter design
Filter design (mathematics)
GFDM
HPA
Information filters
nonlinearity
OFDM
OOB radiation
Orthogonal Frequency Division Multiplexing
PAPR
Power amplifiers
Pulse shaping methods
Quadratic programming
Radiation measurement
RC circuits
Receivers
Wireless networks
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Summary:Generalized Frequency Division Multiplexing (GFDM) has been considered as an attractive candidate to replace Orthogonal Frequency Division Multiplexing (OFDM) for the fifth generation (5G) mobile networks. GFDM system has better spectral characteristics compared to the OFDM system due to the use of properly selected pulse shaping filters. Non-causal ideal filters, such as the raised cosine (RC), are commonly used in the GFDM systems. In practical implementation, non-causal filters need to be truncated and shifted, which will increase the out-of-band (OOB) radiation of the signal and will introduce delay to the system. High OOB radiation will cause interferences between the adjacent channels, thus it should be minimized. This paper proposes to minimize the OOB radiation of the GFDM system using the designed pulse shaping filters. The pulse shaping filters are designed using the computationally efficient quadratic programming (QP) approach. Numerical results illustrate that OOB radiation level of the GFDM system is lower when the QP filters are used compared to the conventional RC filter. Further investigation shows that the use of the QP filters are efficient in increasing the high power amplifier (HPA) efficiency, improving the spectral efficiency, and reducing the BER at the receiver.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2975430