Journal ArticleDOI
Making smart use of excess antennas: Massive MIMO, small cells, and TDD
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TLDR
It is suggested that time division duplexing (TDD) could be a key enabler for a new heterogeneous network architecture with the potential to provide ubiquitous coverage and unprecedented spectral area efficiencies.Abstract:
In this paper, we present a vision beyond the conventional Long Term Evolution Fourth Generation (LTE-4G) evolution path and suggest that time division duplexing (TDD) could be a key enabler for a new heterogeneous network architecture with the potential to provide ubiquitous coverage and unprecedented spectral area efficiencies. This architecture is based on a cochannel deployment of macro base stations (BSs) with very large antenna arrays and a secondary tier of small cells (SCs) with a few antennas each. Both tiers employ a TDD protocol in a synchronized fashion. The resulting channel reciprocity enables not only the estimation of large-dimensional channels at the BSs, but also an implicit coordination between both tiers without the need to exchange user data or channel state information (CSI) over the backhaul. In particular, during the uplink (UL), the BSs and SCs can locally estimate the dominant interference sub-space. This knowledge can be leveraged for downlink (DL) precoding to reduce intra- and inter-tier interference. In other words, the BSs and SCs “sacrifice” some of their degrees of freedom for interference rejection. Our simulation results demonstrate that the proposed architecture and precoding scheme can achieve a very attractive rate region compared to several baseline scenarios. For example, with 100 antennas at each BS and four antennas at each SC, we observe an aggregate area throughput of 7.63 Gb/s/km2 (DL) and 8.93 Gb/s/km2 (UL) on a 20 MHz band shared by about 100 mobile devices.read more
Citations
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Journal ArticleDOI
Enhancing the performance of futurewireless networks with software-defined networking Project supported by the US National Science Foundation (Nos. CNS-1247955 and CNS-1320664) and the Wireless Engineering Research and Education Center (WEREC) at Auburn University, Auburn, USA
TL;DR: This paper first analyzes the applications of software-defined networking to different types of wireless networks, and discusses several important technical aspects of performance enhancement in SDN-based wireless networks.
Proceedings ArticleDOI
Performance evaluation of low complexity double-sided massive MIMO transceivers
Stefan Schwarz,Markus Rupp +1 more
TL;DR: This paper derives achievable rate upper bounds that facilitate interpretation and explanation of performance losses observed with increasing antenna correlation and with growing number of antennas and spatially multiplexed users.
Journal ArticleDOI
User association and wireless backhaul bandwidth allocation for 5G heterogeneous networks in the millimeter-wave band
TL;DR: Simulation results reveal that the distributed optimization algorithm jointly optimizing two variables outperforms the conventional SINR-based user association strategies.
Proceedings ArticleDOI
Advanced inter-cell interference management technologies in 5G wireless Heterogeneous Networks (HetNets)
TL;DR: An extensive qualitative survey on different schemes of interference reduction is provided along with their performance, effectiveness and deficiencies and key challenges and some guidelines to rework and overcome the shortcomings of the existing schemes are discussed.
Journal ArticleDOI
Interference coordination in full-duplex HetNet with large-scale antenna arrays
Zhaoyang Zhang,Wei Lyu +1 more
TL;DR: This paper provides an interference coordination framework for a two-tier heterogeneous network (HetNet) that consists of a massive-MIMO enabled macro-cell base station (MBS) and a number of full-duplex small- cell base stations (SBSs) and proposes two centralized algorithms, a genetic algorithm (GEA and a greedy algorithm (GRA).
References
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On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
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Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
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Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Fredrik Tufvesson +5 more
TL;DR: The gains in multiuser systems are even more impressive, because such systems offer the possibility to transmit simultaneously to several users and the flexibility to select what users to schedule for reception at any given point in time.