Massive MIMO and Waveform Design for 5th Generation Wireless Communication Systems

Abstract

Abstract-This article reviews existing related work and identifies the main challenges in the key 5G area at the intersection of waveform design and large-scale multiple antenna systems, also known as Massive MIMO. The property of self-equalization is introduced for Filter Bank Multicarrier (FBMC)-based Massive MIMO, which can reduce the number of subcarriers required by the system. It is also shown that the blind channel tracking property of FBMC can be used to address pilot contamination -one of the main limiting factors of Massive MIMO systems. Our findings shed light into and motivate for an entirely new research line towards a better understanding of waveform design with emphasis on FBMC-based Massive MIMO networks.

MIMO Signal Processing in Offset-QAM Based Filter Bank Multicarrier Systems

“…Recently, different variants of FBMC/OQAM have been studied in the context of massive MIMO communications [54], [55] 1 . The essence of massive MIMO is in mitigating the effects of multi-user interference through the exploitation of a large number of antennas at the base station.…”

“…Interestingly, the authors in [55] have experimentally verified that as the number of antennas increases, the equivalent channel after combining the signal components from different antennas becomes smooth, so that it can be assumed flat at the subcarrier level. This flattening effect, known as self-equalization, allows us to establish as accurate model 2) in (26), even for a subcarrier spacing of 87.5 kHz over the Stanford University Interim 4 (SUI-4) channel model [54]. Hence, multi-user MIMO techniques relying on model 2) will be valid for FBMC/OQAM-based massive MIMO communications, subject to self-equalization.…”

Maximum‐likelihood synchronization and channel estimation with multiuser detection in GFDMA

“…The demands of the emerging applications in the fifth generation (5G) of wireless communication systems such as machine‐to‐machine communications and the tactile Internet have necessitated the need for new signaling techniques addressing the shortcomings of orthogonal frequency division multiplexing (OFDM) while keeping its advantages. As a result, a number of waveforms have been reconsidered or new ones have emerged as candidates for inclusion in the physical layer of 5G networks …”

CRAN, H‐CRAN, and F‐RAN for 5G systems: Key capabilities and recent advances

“…Owing to their inherent advantages and great application potential in the future 5G networks, existent techniques are ameliorated and used. Massive multiple input multiple output (massive MIMO), for example, are of paramount importance for leveraging the spectral efficiency and achieving high data rates . The full duplex (FD) mechanism is another example that has proved its effectiveness in improving the system data rates, doubling the spectrum utilization at physical (PHY) layer and reducing the latency …”

“…Massive multiple input multiple output (massive MIMO), for example, are of paramount importance for leveraging the spectral efficiency and achieving high data rates. 18 The full duplex (FD) mechanism is another example that has proved its effectiveness in improving the system data rates, doubling the spectrum utilization at physical (PHY) layer and reducing the latency. 19 This paper surveys the Cloud Radio Access Network (CRAN) and its 2 improved versions, namely, heterogeneous CRAN (H-CRAN) and Fog Radio Access Network (F-RAN).…”