A Cyclic Prefix Free Multiple Input Multiple Output Generalized Frequency Division Multiplexing System Design
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A Cyclic Prefix Free Multiple Input Multiple Output Generalized Frequency Division Multiplexing System Design Yeh Chuang1 · Fang‑Biau Ueng1 · Ye‑Shun Shen2 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The existing generalized frequency division multiplexing (GFDM) systems employ cyclic prefix (CP) to avoid inter-symbol interference (ISI) in frequency-selective fading channels. For multiple input multiple output GFDM (MIMO-GFDM) system, the existence of CP will result in the losses of spectrum efficiency, energy efficiency and transmission rate (SET). In this paper, we propose a novel MIMO-GFDM system without CP insertion. We design a decision feedback equalizer that is performed before fast Fourier transform operation to efficiently remove ISI. We also design a CP restoration unit to remove the intercarrier interference in the MIMO-GFDM systems. The proposed CP-free MIMO-GFDM system offers a much higher SET than traditional MIMO-GFDM systems in frequency selective fading channels. Some simulation examples are given to demonstrate the effective of the proposed MIMO-GFDM system. Keywords MIMO-GFDM · Cyclic prefix · Decision feedback equalizer · Inter-symbol interference
1 Introduction People are increasingly demanding the transmission rate of communication. Orthogonal frequency-division multiplexing (OFDM) technology is widely used due to its high-rate transmission and capability of against multi-path interference, and has become the main wireless transmission technology used by fourth generation (4G) mobile networks. However, due to the drawbacks such as sensitivity of synchronization errors and out-of-band (OOB) emission problem, OFDM is now facing the challenges of the fifth generation (5G) mobile communication applications, such as machine-type communication (MTC) which requires only coarse synchronization and Internet of Things (IoT). Since MTC requires lower power consumption and the IoTs will become more and more popular in the future, this means that more and more devices can be connected to the Internet instantaneously at the same moment. Because of high OOB emission, OFDM will not be suitable for future * Fang‑Biau Ueng [email protected] 1
Department of Electrical Engineering, National Chung-Hsing University, Taichung, Taiwan
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Department of Aeronautical Engineering, National Formosa University, Yunlin, Taiwan
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5G applications [1]. To solve the high OOB problem and other abovementioned drawbacks of OFDM, a flexible multicarrier modulation scheme which is comprised of nonorthogonal waveforms, named generalized frequency division multiplexing (GFDM) [1] has been proposed for 5G networks. The GFDM divides high-rate input data streams into lower-speed data streams and overlap the spectrum through multiple spectra to achieve higher bandwidth efficiency than traditional OFDM [2, 3]. Due to the non-orthogonality of GFDM introduces ISI, GFDM inherits the cyclic-prefixed (CP) block signaling structure f
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