Journal ArticleDOI
An overview of limited feedback in wireless communication systems
David J. Love,Robert W. Heath,Vincent K. N. Lau,David Gesbert,Bhaskar D. Rao,Matthew Andrews +5 more
Reads0
Chats0
TLDR
This tutorial provides a broad look at the field of limited feedback wireless communications, and reviews work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology.Abstract:
It is now well known that employing channel adaptive signaling in wireless communication systems can yield large improvements in almost any performance metric. Unfortunately, many kinds of channel adaptive techniques have been deemed impractical in the past because of the problem of obtaining channel knowledge at the transmitter. The transmitter in many systems (such as those using frequency division duplexing) can not leverage techniques such as training to obtain channel state information. Over the last few years, research has repeatedly shown that allowing the receiver to send a small number of information bits about the channel conditions to the transmitter can allow near optimal channel adaptation. These practical systems, which are commonly referred to as limited or finite-rate feedback systems, supply benefits nearly identical to unrealizable perfect transmitter channel knowledge systems when they are judiciously designed. In this tutorial, we provide a broad look at the field of limited feedback wireless communications. We review work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology. We also provide a synopsis of the role of limited feedback in the standardization of next generation wireless systems.read more
Citations
More filters
Proceedings ArticleDOI
Multicell network duality with instantaneous and statistical channel information: A nonlinear Perron-Frobenius characterization
TL;DR: This paper studies a joint optimization of beamforming and power control to enforce egalitarian fairness for all users in a multicell setting by leveraging nonlinear Perron-Frobenius theory to establish the network duality for the max-min weighted SINR problem.
Dissertation
Transmitter cooperation with distributed feedback in wireless networks
TL;DR: In this paper, the impact of imperfect knowledge of the channel state information (CSI) on the precoding performance of a distributed CSI configuration is investigated. But the authors focus on the case where the transmitters would like to cooperate in their transmission but can only imperfectly exchange on CSI which is acquired locally.
Journal ArticleDOI
Threshold-based CSI feedback reduction for time-varying multiple-input multiple-output broadcast channels
TL;DR: Analysis and simulation results for zero-forcing beamforming precoding show net-throughput superiority of the proposed scheme over the case of perfect CSI.
Proceedings ArticleDOI
A Feedback Update Control Scheme for Limited Feedback Multiple Antennas Systems
TL;DR: Analyzing the required CSI feedback rate and feedback update period and employing a random quantization argument leads to a bound on the feedback rate that characterizes when the proposed feedback update control scheme outperforms the conventional feedback scheme.
Journal ArticleDOI
AoI-Aware Joint Spectrum and Power Allocation for Internet of Vehicles: A Trust Region Policy Optimization-Based Approach
TL;DR: Simulation results show that the TRPO-based scheme significantly outperforms both the deep $Q$ network (DQN)-based scheme and the random scheme in terms of average cumulative reward, convergence speed, and stability.
References
More filters
Journal ArticleDOI
A simple transmit diversity technique for wireless communications
TL;DR: This paper presents a simple two-branch transmit diversity scheme that provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas.
Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
TL;DR: Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.
Journal ArticleDOI
Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
Journal ArticleDOI
Space-time block codes from orthogonal designs
TL;DR: A generalization of orthogonal designs is shown to provide space-time block codes for both real and complex constellations for any number of transmit antennas and it is shown that many of the codes presented here are optimal in this sense.