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- Jakob Hoydis, Stephan ten Brink, Mérouane Debbah
- IEEE Journal on Selected Areas in Communications
- 2013

We consider the uplink (UL) and downlink (DL) of non-cooperative multi-cellular time-division duplexing (TDD) systems, assuming that the number N of antennas per base station (BS) and the number K of user terminals (UTs) per cell are large. Our system model accounts for channel estimation, pilot contamination, and an arbitrary path loss and antenna… (More)

- Emil Björnson, Jakob Hoydis, Marios Kountouris, Mérouane Debbah
- IEEE Transactions on Information Theory
- 2014

The use of large-scale antenna arrays can bring substantial improvements in energy and/or spectral efficiency to wireless systems due to the greatly improved spatial resolution and array gain. Recent works in the field of massive multiple-input multiple-output (MIMO) show that the user channels decorrelate when the number of antennas at the base stations… (More)

- Jakob Hoydis, Stephan ten Brink, Mérouane Debbah
- 2011 49th Annual Allerton Conference on…
- 2011

We consider a multicell MIMO uplink channel where each base station (BS) is equipped with a large number of antennas N. The BSs are assumed to estimate their channels based on pilot sequences sent by the user terminals (UTs). Recent work has shown that, as N → ∞, (i) the simplest form of user detection, i.e., the matched filter (MF), becomes… (More)

- Emil Björnson, Luca Sanguinetti, Jakob Hoydis, Mérouane Debbah
- IEEE Trans. Wireless Communications
- 2015

Assume that a multi-user multiple-input multiple-output (MIMO) system is designed from scratch to uniformly cover a given area with maximal energy efficiency (EE). What are the optimal number of antennas, active users, and transmit power? The aim of this paper is to answer this fundamental question. We consider jointly the uplink and downlink with different… (More)

- Emil Björnson, Luca Sanguinetti, Jakob Hoydis, Mérouane Debbah
- 2014 IEEE Wireless Communications and Networking…
- 2014

Assume that a multi-user multiple-input multiple-output (MIMO) communication system must be designed to cover a given area with maximal energy efficiency (bits/Joule). What are the optimal values for the number of antennas, active users, and transmit power? By using a new model that describes how these three parameters affect the total energy efficiency of… (More)

- Jakob Hoydis, Cornelis Hoek, Thorsten Wild, Stephan ten Brink
- ISWCS
- 2012

Equipping base stations (BSs) with very large antenna arrays is a promising way to increase the spectral and energy efficiency of mobile communication systems without the need for new cell sites. However, the prominently theoretical works on this topic are based on several crucial assumptions about the wireless channel which have not been sufficiently… (More)

- Jakob Hoydis, Kianoush Hosseini, Stephan ten Brink, Mérouane Debbah
- Bell Labs Technical Journal
- 2013

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 effi ciencies. This architecture is based… (More)

- Jakob Hoydis, Mari Kobayashi, Mérouane Debbah
- IEEE Transactions on Signal Processing
- 2011

We consider a multicell frequency-selective fading uplink channel (network MIMO) from <i>K</i> single-antenna user terminals (UTs) to <i>B</i> cooperative base stations (BSs) with <i>M</i> antennas each. The BSs, assumed to be oblivious of the applied codebooks, forward compressed versions of their observations to a central station (CS) via capacity limited… (More)

We consider the problem of multi-cell downlink beamforming with N cells and K terminals per cell. Cooperation among base stations (BSs) has been found to increase the system throughput in a multi-cell set up by mitigating inter-cell interference. Most of the previous works assume that the BSs can exchange the instantaneous channel state information (CSI) of… (More)

- Axel Müller, Jakob Hoydis, Romain Couillet, Mérouane Debbah
- GLOBECOM
- 2012

This article proposes a large system approximation of the ergodic sum-rate (SR) for cellular multi-user multipleinput multiple-output uplink systems. The considered system has various degrees of freedom, such as clusters of base stations (BSs) performing cooperative multi-point processing, randomly distributed user terminals (UTs), and supports arbitrarily… (More)