Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
TLDR
A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.Abstract:
A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval. Time-division duplex operation combined with reverse-link pilots enables the base station to estimate the reciprocal forward- and reverse-link channels. The conjugate-transpose of the channel estimates are used as a linear precoder and combiner respectively on the forward and reverse links. Propagation, unknown to both terminals and base station, comprises fast fading, log-normal shadow fading, and geometric attenuation. In the limit of an infinite number of antennas a complete multi-cellular analysis, which accounts for inter-cellular interference and the overhead and errors associated with channel-state information, yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve. In particular the effects of uncorrelated noise and fast fading vanish, throughput and the number of terminals are independent of the size of the cells, spectral efficiency is independent of bandwidth, and the required transmitted energy per bit vanishes. The only remaining impairment is inter-cellular interference caused by re-use of the pilot sequences in other cells (pilot contamination) which does not vanish with unlimited number of antennas.read more
Citations
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Journal ArticleDOI
Performance Analysis of Large Multiuser MIMO Systems With Space-Constrained 2-D Antenna Arrays
TL;DR: The analysis shows that EE does not increase infinitely in a massive MIMO system when the increasing number of antennas are to be accommodated within a fixed physical space and the total power consumed is considered to be a function of the antennas.
Posted Content
Linear Precoding Based on Polynomial Expansion: Reducing Complexity in Massive MIMO (extended version)
TL;DR: In this paper, a truncated polynomial expansion (TPE) was proposed for real-time hardware implementation in massive MIMO systems, which can be adapted to the available hardware resources and enables smooth transition between simple maximum ratio transmission (MRT) and more advanced RZF.
Journal ArticleDOI
Resource Allocation for a Massive MIMO Relay Aided Secure Communication
TL;DR: This paper addresses the problem of joint power and time allocation for secure communications in a decode-and-forward massive multiple-input multiple-output (M-MIMO) relaying system in the presence of a passive eavesdropper, and proposes an optimization framework to jointly optimize source transmit power, relay transmitpower, and transmission time in each hop.
Journal ArticleDOI
User Association and Interference Management in Massive MIMO HetNets
Ye Qiaoyang,Ozgun Y. Bursalioglu,Haralabos Papadopoulos,Constantine Caramanis,Jeffrey G. Andrews +4 more
TL;DR: This paper explores how massive MIMO can be used to jointly maximize the offloading gains and minimize the interference challenges arising from adding small cells, and proposes an efficient dual subgradient based algorithm, which converges towards the NUM solution.
Journal ArticleDOI
Low-Complexity Hybrid Precoding in Massive Multiuser MIMO Systems
Le Liang,Wei Xu,Xiaodai Dong +2 more
TL;DR: In this article, a low-complexity hybrid precoding scheme is proposed to approach the performance of the traditional baseband zero-forcing (ZF) precoding, which is considered a virtually optimal linear precoding approach in massive MIMO systems.
References
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