Diversity gains of power control with noisy CSIT in MIMO channels
IEEE Transactions on Information Theory
Cooperative multiplexing: toward higher spectral efficiency in multiple-antenna relay networks
IEEE Transactions on Information Theory
Cooperative diversity over fading channels with impulsive noise
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Cooperative diversity in the presence of impulsive noise
IEEE Transactions on Wireless Communications
Channel Access Scheme for MIMO-Enabled Ad Hoc Networks with Adaptive Diversity/Multiplexing Gains
Mobile Networks and Applications
RBG matching: an innovative combinatorial approach for OFDMA resource allocation
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
Performance analysis of distributed space-time coded protocols for wireless multi-hop communications
IEEE Transactions on Wireless Communications
Transmit diversity vs. spatial multiplexing in modern MIMO systems
IEEE Transactions on Wireless Communications
Finite-SNR diversity-multiplexing tradeoff via asymptotic analysis of large MIMO systems
IEEE Transactions on Information Theory
Performance analysis of bidirectional communication protocols based on decode-and-forward relaying
IEEE Transactions on Communications
Wireless Personal Communications: An International Journal
Wireless Communications & Mobile Computing
| Hi-index | 755.02 |
A nonasymptotic framework is presented to analyze the diversity-multiplexing tradeoff of a multiple-input-multiple-output (MIMO) wireless system at finite signal-to-noise ratios (SNRs). The target data rate at each SNR is proportional to the capacity of an additive white Gaussian noise (AWGN) channel with an array gain. The proportionality constant, which can be interpreted as a finite-SNR spatial multiplexing gain, dictates the sensitivity of the rate adaptation policy to SNR. The diversity gain as a function of SNR for a fixed multiplexing gain is defined by the negative slope of the outage probability versus SNR curve on a log-log scale. The finite-SNR diversity gain provides an estimate of the additional power required to decrease the outage probability by a target amount. For general MIMO systems, lower bounds on the outage probabilities in correlated Rayleigh fading and Rician fading are used to estimate the diversity gain as a function of multiplexing gain and SNR. In addition, exact diversity gain expressions are determined for orthogonal space-time block codes (OSTBC). Spatial correlation significantly lowers the achievable diversity gain at finite SNR when compared to high-SNR asymptotic values. The presence of line-of-sight (LOS) components in Rician fading yields diversity gains higher than high-SNR asymptotic values at some SNRs and multiplexing gains while resulting in diversity gains near zero for multiplexing gains larger than unity. Furthermore, as the multiplexing gain approaches zero, the normalized limiting diversity gain, which can be interpreted in terms of the wideband slope and the high-SNR slope of spectral efficiency, exhibits slow convergence with SNR to the high-SNR asymptotic value. This finite-SNR framework for the diversity-multiplexing tradeoff is useful in MIMO system design for realistic SNRs and propagation environments