On the empirical distribution of eigenvalues of a class of large dimensional random matrices
Journal of Multivariate Analysis
Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
Interference alignment via alternating minimization
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Interference alignment with limited feedback
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 3
On the capacity achieving covariance matrix for Rician MIMO channels: an asymptotic approach
IEEE Transactions on Information Theory
Capacity scaling in MIMO wireless systems under correlated fading
IEEE Transactions on Information Theory
On the asymptotic eigenvalue distribution of concatenated vector-valued fading channels
IEEE Transactions on Information Theory
On the Achievable Sum Rate for MIMO Interference Channels
IEEE Transactions on Information Theory
Degrees of Freedom for the MIMO Interference Channel
IEEE Transactions on Information Theory
Interference Alignment and Degrees of Freedom of the -User Interference Channel
IEEE Transactions on Information Theory
Communication Over MIMO X Channels: Interference Alignment, Decomposition, and Performance Analysis
IEEE Transactions on Information Theory
Asymptotic Capacity and Optimal Precoding in MIMO Multi-Hop Relay Networks
IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
A SVD-based location coding for cognitive radio in MIMO uplink channels
IEEE Communications Letters
Space alignment for cognitive transmission in MIMO uplink channels
EURASIP Journal on Wireless Communications and Networking
Random access heterogeneous MIMO networks
Proceedings of the ACM SIGCOMM 2011 conference
Zero-Forcing Spatial Interweave with Greedy Scheduling
Wireless Personal Communications: An International Journal
| Hi-index | 35.68 |
We describe a noncooperative interference alignment (IA) technique which allows an opportunistic multiple input multiple output (MIMO) link (secondary) to harmlessly coexist with another MIMO link (primary) in the same frequency band. Assuming perfect channel knowledge at the primary receiver and transmitter, capacity is achieved by transmiting along the spatial directions (SD) associated with the singular values of its channel matrix using a water-filling power allocation (PA) scheme. Often, power limitations lead the primary transmitter to leave some of its SD unused. Here, it is shown that the opportunistic link can transmit its own data if it is possible to align the interference produced on the primary link with such unused SDs.We provide both a processing scheme to perform IA and a PA scheme which maximizes the transmission rate of the opportunistic link. The asymptotes of the achievable transmission rates of the opportunistic link are obtained in the regime of large numbers of antennas. Using this result, it is demonstrated that depending on the signal-to-noise ratio and the number of transmit and receive antennas of the primary and opportunistic links, both systems can achieve transmission rates of the same order.