Shifting the MIMO Paradigm

  title={Shifting the MIMO Paradigm},
  author={David Gesbert and Marios Kountouris and Robert W. Heath and Chan-Byoung Chae and Thomas E. S{\"a}lzer},
  journal={IEEE Signal Processing Magazine},
Multi-user MIMO (MU-MIMO) networks reveal the unique opportunities arising from a joint optimization of antenna combining techniques with resource allocation protocols. Furthermore, it brings robustness with respect to multipath richness, allowing for compact antenna spacing at the BS and, crucially, yielding the diversity and multiplexing gains without the need for multiple antenna user terminals. To realize these gains, however, the BS should be informed with the user's channel coefficients… 

Enhanced multi-antenna capabilities through small cell collaboration

Downlink Multi-User MIMO (MU-MIMO) is a spatial multiplexing technique in which multiple transmit antennas at an evolved Node Base station (eNB) are used to simultaneously serve multiple User

Modified SINR based user selection for MU-MIMO systems

Interference based scheduling for multiuser MIMO (MU-MIMO) communication is analyzed in terms of performance gains, fairness, and computational complexity.

Fast link adaptation for opportunistic multiuser MIMO-OFDM wireless networks

Numerical results based on parameters typically used in modern wireless local area networks (WLANs) show that the proposed system can improve the system throughput performance by a factor proportional to the number of transmit antennas.

Receive combining vs. multistream multiplexing in multiuser MIMO systems

The unexpected conclusion is that each user only should receive one stream and use its antennas to achieve a receive combining gain, which has positive implications for the design of multiuser systems as it reduces the hardware constraints at the user devices.

Opportunistic multiuser MIMO for OFDM networks

Numerical results demonstrate very significant improvements in terms of sum-rate capacity in comparison to a conventional (opportunistic) TDMA scheme.

Uplink performance of conventional and massive MIMO cellular systems with delayed CSIT

The effect of time variation of the channel due to the relative users' movement with regard to the base station is investigated to provide interesting insights on how the user mobility degrades the system performance.

Scalable user selection for MU-MIMO networks

A scalable user selection mechanism called orthogonality probing based user selection (OPUS), which employs a novel probing mechanism that enables a user to evaluate its orthog onality with existing users, and a distributed contention mechanism that singles out the best user to feedback its CSI.

Zero-forcing assisted spatial stream allocation in uplink multiuser MIMO systems

  • Aasem N. AlyahyaJ. Ilow
  • Business
    2015 IEEE 28th Canadian Conference on Electrical and Computer Engineering (CCECE)
  • 2015
A low complexity postprocessing technique allocating spatial streams for uplink transmissions in multiuser (MU) multiple-input multiple-output (MIMO) systems based on zero-forcing (ZF) cancelation of the multiple access interference (MAI) caused by simultaneous transmissions.

Exploiting Spatial and Frequency Diversity in Spatially Correlated MU-MIMO Downlink Channels

  • R. Nordin
  • Business
    J. Comput. Networks Commun.
  • 2012
The results have shown that the proposed downlink transmission scheme offers robust bit error rate (BER) performance, even when simulated in a fully correlated channel, without imposing higher feedback requirements on the base controller.

Multi User and Multi Cell Simulations

With MU-MIMO the need for multiple antennas at the users is eliminated, facilitating the development of small and cheap user equipments, and the potential multiplexing gain is only confined by the capabilities of the transmitter.



Precoding Schemes for the MIMO-GBC

This semi-tutorial work discusses some low-complexity alternatives to achieve a downlink throughput very close to the optimal sum capacity and shows that, in the simple setting of independently fading channels, relatively traditional forms of linear beamforming achieve the best tradeoff between performance and complexity.

Zero-forcing methods for downlink spatial multiplexing in multiuser MIMO channels

While the proposed algorithms are suboptimal, they lead to simpler transmitter and receiver structures and allow for a reasonable tradeoff between performance and complexity.

Opportunistic beamforming using dumb antennas

This paper proposes a scheme that induces random fading when the environment has little scattering and/or the fading is slow, and focuses on the downlink of a cellular system.

Finite-Rate Feedback MIMO Broadcast Channels with a Large Number of Users

This work analyzes the sum-rate performance of a multi-antenna downlink system carrying more users than transmit antennas, with partial channel knowledge at the transmitter due to finite rate feedback, and shows that having more users reduces feedback load.

Transmit correlation-aided opportunistic beamforming and scheduling

A random multiuser beamforming scheme is considered and it is shown how long-term statistical information of users' channels can be efficiently combined with short-term SINR feedback to increase system performance substantially over a conventional opportunisticbeamforming scheme.

On downlink beamforming with greedy user selection: performance analysis and a simple new algorithm

The results indicate that the proposed method attains a significant fraction of sum capacity and throughput of Tu and Blum's scheme and, thus, offers an attractive alternative to DP-based schemes.

MIMO Broadcast Channels With Finite-Rate Feedback

  • N. Jindal
  • Computer Science
    IEEE Transactions on Information Theory
  • 2005
A key finding is that the feedback rate per mobile must be increased linearly with the signal-to-noise ratio (SNR) (in decibels) in order to achieve the full multiplexing gain.

Degrees of freedom in wireless multiuser spatial multiplex systems with multiple antennas

  • W. YuW. Rhee
  • Business, Computer Science
    IEEE Transactions on Communications
  • 2006
This letter shows that the optimal transmission strategy in an uplink or downlink channel with n antennas at the base-station involves more than n users at the same time, and gives a dimension-counting interpretation for multiuser diversity.

Low Complexity User Selection Algorithms for Multiuser MIMO Systems with Block Diagonalization

This work proposes two low-complexity suboptimal user selection algorithms for multiuser MIMO systems with block diagonalization that aim to select a subset of users such that the total throughput is nearly maximized.

Transmit Selection Diversity for Unitary Precoded Multiuser Spatial Multiplexing Systems With Linear Receivers

Two precoding methods that use extra transmit antennas, beyond the minimum required, to provide additional degrees of diversity and mutual information over single-user multiple-input multiple-output (MIMO) methods and static allocation methods are proposed.