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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Patent
An apparatus and a method for managing full-duplex communication between a base station and a plurality of user equipments
TL;DR: In this paper, an apparatus for managing full-duplex communication between a base station (BS 0 ) and a set of user equipments (101a,b) consisting of a plurality of transmitter antennas was presented.
Journal ArticleDOI
Joint Device Association and Power Coordination for H2H and IoT Communications in Massive MIMO Enabled HCNs
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Proceedings ArticleDOI
Cross-tier interference mitigation for RTDD-based macro-femto networks
TL;DR: Numerical results demonstrate that the proposed scheme can significantly improve the MBS's performance with a slight degradation of the femto-cell's performance.
Journal ArticleDOI
Balance-driven analysis of cell-edge user interference management in massive MIMO enabled irregular network
Changshan Chen,Xinsheng Zhao +1 more
TL;DR: It is found that the success probability of both the CCU and CEU decreases with the enlarged cell-edge area in the case of the high density of users and small density of base stations, which leads to a consideration of the balance between the CEU performance enhancement and theCCU tolerable performance degradation.
Proceedings ArticleDOI
Resource Allocation and User Association in Massive MIMO Enabled Wireless Backhaul Network
TL;DR: The paper provides a general framework of massive MIMO backhauling in a heterogeneous network and aims at jointly optimizing the sum logarithm rate with respect to user association, number of antennas, and bandwidth allocation, subject to wireless backhaul as a constraint.
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On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
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TL;DR: In this article, the authors examined the performance of using multi-element array (MEA) technology to improve the bit-rate of digital wireless communications and showed that with high probability extraordinary capacity is available.
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Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
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Journal ArticleDOI
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.