MIMO Signaling for Low Rank Channels

Authors

Armin Wittneben and Boris Rankov

Reference

International Symposium on Electromagnetic Theory, URSI, May 2004, (invited paper).

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Abstract

Future Wireless LANs will consist of heterogeneous nodes and will require more than 1Gbps peak throughput between nodes. This makes spatial multiplexing (MIMO) technology indispensable to achieve the required bandwidth efficiency. Due to available spectrum future WLANs will operate beyond 2.4GHz. Increased path loss and poor scattering are major problems for MIMO beyond 2.4GHz. We discuss the basic tradeoffs and outline the paradigm shift from “rich scattering/poor array” to “poor scattering/rich array” as the carrier frequency increases. We show, that (i) a two-hop traffic pattern, which involves an access point with distributed antennas, solves the poor scattering/rich array problem and (ii) linear processing at the access point suffices in many practical cases. Finally some aspects of the source/destination antenna array design are addressed.


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Copyright Notice: © 2004 A. Wittneben and B. Rankov.

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