Diversity-Multiplexing Tradeoff for Cooperative Systems: Characterization and Impact on Joint Source-Channel Coding
April 10, 2006 10:30 AM to 11:00 AM
Speakers:
Erkip, Elza
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Abstract: |
In this talk, we first investigate the diversity-multiplexing tradeoff for cooperative wireless networks. We study various network configurations such as multiple relays, multiple source/destination pairs, multiple antenna users, different user locations, as well as the performance achievable by different relaying strategies. We are particularly interested in whether the virtual multi-input multi-output (MIMO) system created by cooperation mimics a physical MIMO. We next show how the diversity-multiplexing tradeoff can be utilized for efficient transmission of an analog source over a slowly fading cooperative wireless channel. The performance metric is the distortion exponent, which is the signal-to-noise exponent of the average end-to-end distortion caused by compression and channel errors. We discuss source and channel coding strategies that compress the source signal in multiple layers and then transmit these layers either successively in time or superimpose them for simultaneous transmission. We also illustrate the benefits of unequal error protection provided by cooperation.
Joint work with Deniz Gunduz and Melda Yuksel. |
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