Array Gain in the DMT Framework for MIMO Channels

• Published in: IEEE transactions on information theory 2012-07, Vol.58 (7), p.4577-4593
• Main Authors: Ordóñez, Luis G., Palomar, Daniel P., Rodríguez Fonollosa, Javier
• Format: Article
• Language: English
• Subjects: Applied sciences; Array gain; Arrays; Channel models; Detection, estimation, filtering, equalization, prediction; Diversity methods; diversity multiplexing tradeoff (DMT); Enginyeria de la telecomunicació; Exact sciences and technology; Fading; Information theory; Information, signal and communications theory; MIMO systems; Multiplexers; Multiplexing; outage probability; performance analysis of multiple-input multiple-output (MIMO) channels; Processament del senyal; Reliability; Rician channels; Senyal, Teoria del (Telecomunicació); Signal and communications theory; Signal theory (Telecommunication); Signal, noise; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Tractament del senyal; Transmission and modulation (techniques and equipments); Transmitters; Àrees temàtiques de la UPC
• ISSN: 0018-9448; 1557-9654
• DOI: 10.1109/TIT.2012.2191933

Following the seminal work by Zheng and Tse on the diversity and multiplexing tradeoff (DMT) of multiple-input multiple-output (MIMO) channels, in this paper, we introduce the array gain to investigate the fundamental relation between transmission rate and reliability in MIMO systems. The array gain gives information on the power offset that results from exploiting channel state information at the transmitter or as a consequence of the channel model. Hence, the diversity, multiplexing, and array gain (DMA) analysis is able to cope with the limitations of the original DMT and provide an operational meaning in the sense that the DMA gains of a particular system can be directly translated into a parameterized characterization of its associated outage probability performance. In this paper, we derive the best DMA gains achievable by any scheme employing isotropic signaling in uncorrelated Rayleigh, semicorrelated Rayleigh, and uncorrelated Rician block-fading MIMO channels. We use these results to analyze the effect of important channel parameters on the outage performance at different points of the DMT curve.