Impact of Cooperative Relays on the Capacity of Rank-Deficient MIMO Channels


Armin Wittneben and Boris Rankov


Proceedings of the 12th IST Summit on Mobile and Wireless Communications, Aveiro, Portugal, pp. 421-425, June 2003.

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We study the impact of multiple linear amplify-and-forward relays on the capacity of rank-deficient MIMO channels. We derive a general system model for wireless networks with one source/destination pair and several linear amplify-and-forward relay nodes which assist the communication between source and destination. All nodes may be equipped with multiple antennas. For a given allocation of gain factors at the relay nodes we give an analytical expression of the capacity. We compare the performance of a relay assisted MIMO link in a line-of-sight environment with a MIMO link without relay nodes. Our results show that the proposed cooperative signaling scheme solves a fundamental problem of MIMO systems: the rich scattering requirement.


Cooperative signaling, relay networks, capacity, mimo

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Copyright Notice: © 2003 A. Wittneben and B. Rankov.

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