Performance analysis of MIMO ad hoc networks with finite rate feedback and imperfect CSIT
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Exploiting opportunistic multiuser detection in decentralized multiuser MIMO systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
An iterative precoder optimization method for K-user interference channel systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Asymptotic spectral efficiency of MIMO ad hoc networks
IEEE Transactions on Signal Processing
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Spectral-efficiency of multi-antenna links in ad-hoc wireless networks with limited Tx CSI
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Cross-layer optimization for wireless mesh networks with smart antennas
Computer Communications
Cooperative relay assignment for static energy-constrained networks
International Journal of Sensor Networks
Hi-index | 35.69 |
We study in this paper the network spectral efficiency of a multiple-input multiple-output (MIMO) ad hoc network with K simultaneous communicating transmitter-receiver pairs. Assuming that each transmitter is equipped with t antennas and each receiver with r antennas and each receiver implements single-user detection, we show that in the absence of channel state information (CSI) at the transmitters, the asymptotic network spectral efficiency is limited by r nats/s/Hz as Krarrinfin and is independent of t and the transmit power. With CSI corresponding to the intended receiver available at the transmitter, we demonstrate that the asymptotic spectral efficiency is at least t+r+2radictr nats/s/Hz. Asymptotically optimum signaling is also derived under the same CSI assumption, i.e., each transmitter knows the channel corresponding to its desired receiver only. Further capacity improvement is possible with stronger CSI assumption; we demonstrate this using a heuristic interference suppression transmit beamforming approach. The conventional orthogonal transmission approach is also analyzed. In particular, we show that with idealized medium access control, the channelized transmission has unbounded asymptotic spectral efficiency under the constant per-user power constraint. The impact of different power constraints on the asymptotic spectral efficiency is also carefully examined. Finally, numerical examples are given that confirm our analysis