Performance enhancement of generalized frequency division multiplexing with RF impairments compensation for efficient 5G wireless access

Abstract

Fifth generation (5G) is expected to support diverse applications with reduced latency, reliability, high spectral efficiency, huge data rate and improved energy efficiency. Among the several waveforms, Generalized Frequency Division Multiplexing (GFDM) gained more attention and considered as one of the candidate waveform for 5G. Radio frequency (RF) impairments such as carrier frequency offset (CFO), intercarrier interference (ICI), out-of-band (OoB) emission, peak to average power ratio (PAPR) and in-phase (I) and quadrature phase (Q) imbalances greatly degrades the GFDM system performance. An efficient spectral shaping with advanced signal processing techniques is highly essential to counteract the RF impairments and to realize the robust physical layer for 5G applications. Hence a spectrally efficient precoder which comprises differential encoding followed by (1 + D) correlative coding with precise, low complex blind IQ imbalance compensation is proposed to preserve GFDM from RF impairments. Simulation results show that the proposed GFDM outperforms the conventional GFDM and OFDM in terms of bit error rate (BER), ICI power, PAPR and OoB radiations which enables the proposed GFDM is one of the solutions to meet the key requirements of 5G wireless access.