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
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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
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Limited Feedback Hybrid Precoding for Multi-User Millimeter Wave Systems
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References
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Proceedings ArticleDOI
Efficient channel quantization scheme for multi-user MIMO broadcast channels with RBD precoding
TL;DR: A new scheme for the channel quantization to supply the transmitter with both channel direction and magnitude information is proposed and a bound for the throughput loss due to imperfect CSI is derived and a way to achieve the bound is found by linearly increasing the number of feedback bits with the system SNR.
Journal ArticleDOI
Performance of Quantized Equal Gain Transmission With Noisy Feedback Channels
TL;DR: The optimum density of codepoints that minimizes the overall distortion subject to a boundedness constraint is shown to be the same as the point density for a noiseless feedback channel, i.e., the uniform density.
Journal ArticleDOI
Extended Space-Time Block Coding with Transmit Antenna Selection over Correlated Fading Channels
TL;DR: A new space-time block coded transmit antenna selection scheme over spatially correlated fading channels is presented and is shown to be more efficient than the conventional transmit antennas selection combined with Alamouti code in correlated channels.
Proceedings ArticleDOI
Achievable rates of MIMO downlink beamforming with non-perfect CSI: a comparison between quantized and analog feedback
TL;DR: It is shown that analog feedback achieves a fraction 1- 2F of the optimal multiplexing gain even in the presence of a feedback delay, when the fading belongs to the class of "Doppler processes" with normalized maximum Doppler frequency shift.
Posted Content
Capacity of Sparse Wideband Channels with Partial Channel Feedback
TL;DR: It is shown that multipath sparsity can be leveraged to achieve the benchmark capacity gain under both average as well as instantaneous power constraints as long as the channel coherence scales at a sufficiently fast rate with the signal space dimension (time-bandwidth product).