Rate Bounds for MIMO Relay Channels Using Precoding



Caleb K. Lo, Sriram Vishwanath, and Robert W. Heath, Jr.,


submitted to IEEE Global Telecommunications Conference, St. Louis, MO, November 28-December 2, 2005.


Relay channels will play a central role in next-generation multihop wireless systems. This paper considers the MIMO relay channel where multiple antennas are employed by each terminal. New lower bounds on the capacity of a Gaussian MIMO relay channel are derived under the assumption that the transmitter employs either superposition coding or dirty-paper coding. The proposed lower bounds improve on a previously proposed lower bound that arises from a simple transmit strategy.

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