Multiple Access Techniques for 5G Wireless Networks

Abstract

Recently, the fifth generation (5G) networks have been heavily investigated in order to support a wide range of applications with different requirements. These applications have been organized in three different types of services: extreme mobile broadband (xMBB), massive machine-type communication (mMTC), and ultra-reliable low latency communication (URLLC), where these applications feature 20 Gb/s peak data rate, 106 devices/km2 connection density, and less than 1 ms latency, respectively. In order to meet such demanding requirements, formidable research challenges have been placed in front of wireless engineers, the very first of which is choosing the appropriate waveform generation technique, which is a shaping component of any air interface. The 5G waveform candidates have been proposed in the “5G Non-orthogonal waveforms for asynchronous signaling” (5GNOW) project and can be classified into two categories: 5G waveforms based legacy orthogonal frequency division multiplexing (OFDM) transceivers, which can be considered as straightforward enhancements of OFDM, including windowed-OFDM (W-OFDM), filtered-OFDM (F-OFDM), and universal filtered multicarrier (UFMC). The second category utilizes 5G waveforms based new transceiver structures, including filter-bank multicarrier (FBMC) and generalized frequency division multiplexing (GFDM).