Uplink SDMA with limited feedback: throughput scaling
EURASIP Journal on Advances in Signal Processing
A diversity guarantee and SNR performance for unitary limited feedback MIMO systems
EURASIP Journal on Advances in Signal Processing
Beamforming in ad hoc networks: MAC design and performance modeling
EURASIP Journal on Wireless Communications and Networking
Efficient hybrid relaying schemes with limited feedback
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Downlink wireless channel estimation for linear MIMO transmission recoding
IEEE Transactions on Communications
Pilot contamination problem in multi-cell TDD systems
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
How many users should inform the BS about their channel information?
ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
IEEE Transactions on Communications
Channel state feedback schemes for multiuser MIMO-OFDM downlink
IEEE Transactions on Communications
Transmission strategies and sum rate maximization in multi-user TDD systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Hybrid pilot/quantization based feedback in multi-antenna TDD systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
On the performance of HARQ with hybrid relaying schemes
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Multiuser MIMO achievable rates with downlink training and channel state
IEEE Transactions on Information Theory
Robust power allocation algorithms for wireless relay networks
IEEE Transactions on Communications
Parametric compression of rank-1 analog feedback in MIMO-OFDM
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Comparison of practical feedback algorithms for multiuser MIMO
IEEE Transactions on Communications
Joint user pairing and precoding in MU-MIMO broadcast channel with limited feedback
IEEE Communications Letters
Limited-rate channel state feedback for multicarrier block fading channels
IEEE Transactions on Information Theory
How much feedback is required for TDD multi-antenna broadcast channels with user selection?
EURASIP Journal on Advances in Signal Processing
An empirical study of analog channel feedback
Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM
Hi-index | 35.80 |
Knowledge of accurate and timely channel state information (CSI) at the transmitter is becoming increasingly important in wireless communication systems. While it is often assumed that the receiver (whether base station or mobile) needs to know the channel for accurate power control, scheduling, and data demodulation, it is now known that the transmitter (especially the base station) can also benefit greatly from this information. For example, recent results in multiantenna multiuser systems show that large throughput gains are possible when the base station uses multiple antennas and a known channel to transmit distinct messages simultaneously and selectively to many single-antenna users. In time-division duplex systems, where the base station and mobiles share the same frequency band for transmission, the base station can exploit reciprocity to obtain the forward channel from pilots received over the reverse channel. Frequency-division duplex systems are more difficult because the base station transmits and receives on different frequencies and therefore cannot use the received pilot to infer anything about the multiantenna transmit channel. Nevertheless, we show that the time occupied in frequency-duplex CSI transfer is generally less than one might expect and falls as the number of antennas increases. Thus, although the total amount of channel information increases with the number of antennas at the base station, the burden of learning this information at the base station paradoxically decreases. Thus, the advantages of having more antennas at the base station extend from having network gains to learning the channel information. We quantify our gains using linear analog modulation which avoids digitizing and coding the CSI and therefore can convey information very rapidly and can be readily analyzed. The old paradigm that it is not worth the effort to learn channel information at the transmitter should be revisited since the effort decreases and the gain increases with the number of antennas.