Guaranteed performance region in fading orthogonal space-time coded broadcast channels

Authors:
Eduard Jorswieck;Björn Ottersten;Aydin Sezgin;Arogyaswami Paulraj
Affiliations:
ACCESS Linnaeus Center, School of Electrical Engineering, KTH-The Royal Institute of Technology, Stockholm, Sweden;ACCESS Linnaeus Center, School of Electrical Engineering, KTH-The Royal Institute of Technology, Stockholm, Sweden;Information Systems Laboratory, Computer Forum, Department of Electrical Engineering, School of Engineering, Stanford University, CA;Information Systems Laboratory, Computer Forum, Department of Electrical Engineering, School of Engineering, Stanford University, CA
Venue:
EURASIP Journal on Wireless Communications and Networking - Theory and Applications in Multiuser/Multiterminal Communications
Year:
2008

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Abstract

Recently, the capacity region of the MIMO broadcast channel (BC) was completely characterized and duality between MIMO multiple access channel (MAC) and MIMO BC with perfect channel state information (CSI) at transmitter and receiver was established. In this work, we propose a MIMO BC approach in which only information about the channel norm is available at the base and hence no joint beamforming and dirty paper precoding (DPC) can be applied. However, a certain set of individual performances in terms ofMSE or zero-outage rates can be guaranteed at any time by applying an orthogonal space-time block code (OSTBC). The guaranteed MSE region without superposition coding is characterized in closed form and the impact of diversity, fading statistics, and number of transmit antennas and receive antennas is analyzed. Finally, six CSI and precoding scenarios with different levels of CSI and precoding are compared numerically in terms of their guaranteed MSE region. Depending on the long-term SNR, superposition coding as well as successive interference cancellation (SIC) with norm feedback performs better than linear precoding with perfect CSI.